Merge pull request #22 from Stone-Red-Code/develop

Version 1.4.0.0

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lib/modio.net"]
+	path = lib/modio.net
+	url = https://github.com/nickelc/modio.net.git

src/DesktopMagic/BuiltInPlugins/BenchmarkPlugin.cs

@@ -0,0 +1,131 @@
+using DesktopMagic.Api;
+using DesktopMagic.Api.Settings;
+
+using System;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+
+namespace DesktopMagic.BuiltInPlugins;
+
+#if DEBUG
+
+internal class BenchmarkPlugin : Plugin
+{
+    private readonly Random rng = new(42);
+    private readonly object rngLock = new();
+
+    private readonly System.Diagnostics.Stopwatch frameTimer = System.Diagnostics.Stopwatch.StartNew();
+    private double fps;
+    private long lastFrameMs;
+
+    [Setting("shape-count", "Shapes")]
+    private readonly IntegerUpDown shapeCount = new(10, 10000, 1000);
+
+    [Setting("shape-type", "Shape Type")]
+    private readonly ComboBox shapeType = new("Rectangles", "Ellipses", "Lines", "Text", "Mixed");
+
+    [Setting("fps-counter", "Fps")]
+    private readonly Label fpsCounter = new("");
+
+    public override int UpdateInterval => 1;
+
+    public override Bitmap? Main()
+    {
+        long now = frameTimer.ElapsedMilliseconds;
+        if (lastFrameMs > 0)
+        {
+            double elapsed = now - lastFrameMs;
+            fps = (fps * 0.9) + (1000.0 / Math.Max(elapsed, 1) * 0.1);
+        }
+        lastFrameMs = now;
+
+        // Render at the full device-pixel window size so both benchmarks cover the
+        // same on-screen area at the same resolution for a fair comparison.
+        int w = Application.WindowPixelSize.Width;
+        int h = Application.WindowPixelSize.Height;
+
+        Bitmap bmp = new Bitmap(w, h);
+        using Graphics g = Graphics.FromImage(bmp);
+        g.Clear(Color.Transparent);
+        g.SmoothingMode = SmoothingMode.HighSpeed;
+        g.CompositingQuality = CompositingQuality.HighSpeed;
+        g.InterpolationMode = InterpolationMode.Low;
+
+        Color color = Application.Theme.PrimaryColor;
+        int count = shapeCount.Value;
+        string type = shapeType.Value;
+
+        for (int i = 0; i < count; i++)
+        {
+            int x, y, rw, rh;
+            lock (rngLock)
+            {
+                x = rng.Next(0, w);
+                y = rng.Next(0, h);
+                rw = rng.Next(5, 60);
+                rh = rng.Next(5, 60);
+            }
+
+            using Brush brush = new SolidBrush(Color.FromArgb(rng.Next(100, 255), color));
+
+            switch (type)
+            {
+                case "Rectangles":
+                    g.FillRectangle(brush, x, y, rw, rh);
+                    break;
+                case "Ellipses":
+                    g.FillEllipse(brush, x, y, rw, rh);
+                    break;
+                case "Lines":
+                    {
+                        int thickness;
+                        lock (rngLock) { thickness = rng.Next(1, 5); }
+                        g.DrawLine(new Pen(brush, thickness), x, y, x + rw, y + rh);
+                    }
+                    break;
+                case "Text":
+                    {
+                        int fontSize;
+                        lock (rngLock) { fontSize = rng.Next(8, 24); }
+                        using Font font = new("Arial", fontSize);
+                        g.DrawString("Mg", font, brush, x, y);
+                    }
+                    break;
+                default:
+                    {
+                        int shape, thickness, fontSize;
+                        lock (rngLock)
+                        {
+                            shape = rng.Next(0, 4);
+                            thickness = rng.Next(1, 5);
+                            fontSize = rng.Next(8, 24);
+                        }
+                        if (shape == 0)
+                        {
+                            g.FillRectangle(brush, x, y, rw, rh);
+                        }
+                        else if (shape == 1)
+                        {
+                            g.FillEllipse(brush, x, y, rw, rh);
+                        }
+                        else if (shape == 2)
+                        {
+                            g.DrawLine(new Pen(brush, thickness), x, y, x + rw, y + rh);
+                        }
+                        else
+                        {
+                            using Font font = new("Arial", fontSize);
+                            g.DrawString("Mg", font, brush, x, y);
+                        }
+                    }
+                    break;
+            }
+        }
+
+        fpsCounter.Value = fps.ToString();
+
+        return bmp;
+    }
+}
+
+#endif

src/DesktopMagic/BuiltInPlugins/SkiaBenchmarkPlugin.cs

@@ -0,0 +1,142 @@
+using DesktopMagic.Api;
+using DesktopMagic.Api.Settings;
+
+using SkiaSharp;
+
+using System;
+using System.Drawing;
+
+namespace DesktopMagic.BuiltInPlugins;
+
+#if DEBUG
+
+internal class SkiaBenchmarkPlugin : SkiaPlugin
+{
+    private readonly Random rng = new(42);
+    private readonly object rngLock = new();
+
+    private readonly System.Diagnostics.Stopwatch frameTimer = System.Diagnostics.Stopwatch.StartNew();
+    private double fps;
+    private long lastFrameMs;
+
+    [Setting("skia-shape-count", "Shapes")]
+    private readonly IntegerUpDown shapeCount = new(10, 10000, 1000);
+
+    [Setting("skia-shape-type", "Shape Type")]
+    private readonly ComboBox shapeType = new("Rectangles", "Ellipses", "Lines", "Text", "Mixed");
+
+    [Setting("skia-fps-counter", "Fps")]
+    private readonly Label fpsCounter = new("");
+
+    public override int UpdateInterval => 1;
+
+    private SKSurface? surface;
+
+    public override void Start()
+    {
+        Size pixelSize = Application.WindowPixelSize;
+        int w = Math.Max(1, pixelSize.Width);
+        int h = Math.Max(1, pixelSize.Height);
+        surface = SKSurface.Create(new SKImageInfo(w, h, SKColorType.Bgra8888, SKAlphaType.Premul));
+    }
+
+    public override SKImage? Main()
+    {
+        long now = frameTimer.ElapsedMilliseconds;
+        if (lastFrameMs > 0)
+        {
+            double elapsed = now - lastFrameMs;
+            fps = (fps * 0.9) + (1000.0 / Math.Max(elapsed, 1) * 0.1);
+        }
+        lastFrameMs = now;
+
+        // Render at the full device-pixel window size so the benchmark measures
+        // real on-screen resolution instead of being scaled down.
+        Size pixelSize = Application.WindowPixelSize;
+        int w = Math.Max(1, pixelSize.Width);
+        int h = Math.Max(1, pixelSize.Height);
+
+        SKCanvas canvas = surface.Canvas;
+
+        canvas.Clear(SKColors.Transparent);
+
+        SKColor color = new(
+            Application.Theme.PrimaryColor.R,
+            Application.Theme.PrimaryColor.G,
+            Application.Theme.PrimaryColor.B,
+            Application.Theme.PrimaryColor.A);
+
+        int count = shapeCount.Value;
+        string type = shapeType.Value;
+
+        for (int i = 0; i < count; i++)
+        {
+            int x, y, rw, rh;
+            lock (rngLock)
+            {
+                x = rng.Next(0, w);
+                y = rng.Next(0, h);
+                rw = rng.Next(5, 60);
+                rh = rng.Next(5, 60);
+            }
+
+            byte alpha = (byte)rng.Next(100, 255);
+            using SKPaint paint = new SKPaint
+            {
+                Color = color.WithAlpha(alpha),
+                IsAntialias = false,
+                Style = SKPaintStyle.Fill
+            };
+
+            switch (type)
+            {
+                case "Rectangles":
+                    canvas.DrawRect(x, y, rw, rh, paint);
+                    break;
+                case "Ellipses":
+                    canvas.DrawOval(x + (rw / 2f), y + (rh / 2f), rw / 2f, rh / 2f, paint);
+                    break;
+                case "Lines":
+                    paint.Style = SKPaintStyle.Stroke;
+                    paint.StrokeWidth = 2;
+                    canvas.DrawLine(x, y, x + rw, y + rh, paint);
+                    break;
+                case "Text":
+                    using (SKFont textFont = new SKFont(SKTypeface.Default, 16))
+                    {
+                        canvas.DrawText("Mg", x, y + 16, SKTextAlign.Left, textFont, paint);
+                    }
+                    break;
+                default:
+                    int shape;
+                    lock (rngLock) { shape = rng.Next(0, 4); }
+                    if (shape == 0)
+                    {
+                        canvas.DrawRect(x, y, rw, rh, paint);
+                    }
+                    else if (shape == 1)
+                    {
+                        canvas.DrawOval(x + (rw / 2f), y + (rh / 2f), rw / 2f, rh / 2f, paint);
+                    }
+                    else if (shape == 2)
+                    {
+                        paint.Style = SKPaintStyle.Stroke;
+                        paint.StrokeWidth = 2;
+                        canvas.DrawLine(x, y, x + rw, y + rh, paint);
+                    }
+                    else
+                    {
+                        using SKFont textFont2 = new SKFont(SKTypeface.Default, 16);
+                        canvas.DrawText("Mg", x, y + 16, SKTextAlign.Left, textFont2, paint);
+                    }
+                    break;
+            }
+        }
+
+        fpsCounter.Value = fps.ToString();
+
+        return surface.Snapshot();
+    }
+}
+
+#endif

src/DesktopMagic/BuiltInPlugins/TimePlugin.cs

@@ -1,62 +1,56 @@
 using DesktopMagic.Api;
 using DesktopMagic.Api.Settings;
 
+using SkiaSharp;
+
 using System;
-using System.Drawing;
-using System.Drawing.Text;
 
 namespace DesktopMagic.BuiltInPlugins;
 
-internal class TimePlugin : Plugin
+internal class TimePlugin : SkiaPlugin
 {
+    private const float FontSize = 200;
+    private const float ContentPadding = 8;
+
     [Setting("display-seconds", "Show Seconds")]
     private readonly CheckBox displaySecondsCheckBox = new CheckBox(true);
 
-    private string oldTime = string.Empty;
-    private bool themeChanged;
-
     public override int UpdateInterval => 1000;
 
-    public override Bitmap? Main()
+    public override SKImage? Main()
     {
-        string time = displaySecondsCheckBox.Value ? DateTime.Now.ToLongTimeString() : DateTime.Now.ToShortTimeString();
+        string time = GetTime();
 
-        if (oldTime == time && !themeChanged)
+        using SKTypeface typeface = SKTypeface.FromFamilyName(Application.Theme.Font);
+        using SKFont font = new(typeface, FontSize);
+        using SKPaint paint = new()
         {
-            return null;
-        }
+            Color = new SKColor(
+                Application.Theme.PrimaryColor.R,
+                Application.Theme.PrimaryColor.G,
+                Application.Theme.PrimaryColor.B,
+                Application.Theme.PrimaryColor.A),
+            IsAntialias = true
+        };
 
-        oldTime = time;
-        themeChanged = false;
+        float textWidth = font.MeasureText(time, paint);
+        SKFontMetrics metrics = font.Metrics;
+        float textHeight = metrics.Descent - metrics.Ascent;
 
-        using Font font = new Font(Application.Theme.Font, 200);
+        int width = (int)Math.Ceiling(textWidth) + (int)(ContentPadding * 2);
+        int height = (int)Math.Ceiling(textHeight) + (int)(ContentPadding * 2);
 
-        Bitmap bmp = new Bitmap(1, 1);
-        bmp.SetResolution(100, 100);
-        using Graphics tmpGr = Graphics.FromImage(bmp);
-        tmpGr.TextRenderingHint = TextRenderingHint.AntiAlias;
+        using SKSurface surface = SKSurface.Create(new SKImageInfo(width, height, SKColorType.Bgra8888, SKAlphaType.Premul));
+        surface.Canvas.Clear(SKColors.Transparent);
 
-        SizeF size = tmpGr.MeasureString(time, font);
+        // Draw the text at a fixed size into a content-sized image; the window scales it to fit.
+        surface.Canvas.DrawText(time, ContentPadding, -metrics.Ascent + ContentPadding, SKTextAlign.Left, font, paint);
 
-        bmp = new Bitmap((int)size.Width, (int)size.Height);
-        bmp.SetResolution(100, 100);
-
-        using Graphics gr = Graphics.FromImage(bmp);
-        using SolidBrush brush = new SolidBrush(Application.Theme.PrimaryColor);
-
-        gr.TextRenderingHint = TextRenderingHint.AntiAlias;
-        gr.DrawString(time, font, brush, 0, 0);
-
-        return bmp;
+        return surface.Snapshot();
     }
 
-    public override void OnThemeChanged()
+    private string GetTime()
     {
-        themeChanged = true;
+        return displaySecondsCheckBox.Value ? DateTime.Now.ToLongTimeString() : DateTime.Now.ToShortTimeString();
     }
-
-    public override void OnSettingsChanged()
-    {
-        themeChanged = true;
-    }
-}
+}

src/DesktopMagic/BuiltInPlugins/WeatherPlugin.cs

@@ -58,9 +58,6 @@ public class WeatherPlugin : AsyncPlugin
         showTime.OnValueChanged += Application.UpdateWindow;
         fontSizeSlider.OnValueChanged += Application.UpdateWindow;
 
-        await UpdateLocationAndWeather();
-        Application.UpdateWindow();
-
         searchButton.OnClick += () =>
         {
             isLoading = true;
@@ -73,6 +70,9 @@ public class WeatherPlugin : AsyncPlugin
                 Application.UpdateWindow();
             });
         };
+
+        await UpdateLocationAndWeather();
+        Application.UpdateWindow();
     }
 
     public override async Task<Bitmap?> MainAsync(CancellationToken cancellationToken)

src/DesktopMagic/Controls/ScreenSelector.xaml

@@ -0,0 +1,78 @@
+<UserControl x:Class="DesktopMagic.Controls.ScreenSelector"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignHeight="60"
+             d:DesignWidth="600"
+             Loaded="UserControl_Loaded"
+             SizeChanged="UserControl_SizeChanged"
+             Unloaded="UserControl_Unloaded">
+
+    <UserControl.Resources>
+        <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
+    </UserControl.Resources>
+
+    <Grid Background="Transparent">
+        <ItemsControl ItemsSource="{Binding ItemsSource, RelativeSource={RelativeSource AncestorType=UserControl}}">
+            <ItemsControl.ItemsPanel>
+                <ItemsPanelTemplate>
+                    <Canvas />
+                </ItemsPanelTemplate>
+            </ItemsControl.ItemsPanel>
+
+            <ItemsControl.ItemTemplate>
+                <DataTemplate>
+                    <Border x:Name="ScreenBorder"
+                            Width="{Binding Width}"
+                            Height="{Binding Height}"
+                            MouseLeftButtonDown="Screen_MouseLeftButtonDown"
+                            Cursor="Hand"
+                            ToolTipService.ToolTip="{Binding ToolTipText}">
+                        <Border.RenderTransform>
+                            <TranslateTransform X="{Binding X}" Y="{Binding Y}" />
+                        </Border.RenderTransform>
+                        <Border.Style>
+                            <Style TargetType="Border">
+                                <Setter Property="Background" Value="{DynamicResource ControlFillColorDefaultBrush}" />
+                                <Setter Property="BorderBrush" Value="{DynamicResource ControlStrokeColorDefaultBrush}" />
+                                <Setter Property="BorderThickness" Value="1" />
+                                <Setter Property="CornerRadius" Value="4" />
+                                <Style.Triggers>
+                                    <Trigger Property="IsMouseOver" Value="True">
+                                        <Setter Property="Background" Value="{DynamicResource ControlFillColorSecondaryBrush}" />
+                                    </Trigger>
+                                    <DataTrigger Binding="{Binding IsSelected}" Value="True">
+                                        <Setter Property="BorderBrush" Value="{DynamicResource AccentFillColorDefaultBrush}" />
+                                        <Setter Property="BorderThickness" Value="2" />
+                                    </DataTrigger>
+                                </Style.Triggers>
+                            </Style>
+                        </Border.Style>
+
+                        <Grid>
+                            <TextBlock
+                                Margin="4,1,0,0"
+                                VerticalAlignment="Top"
+                                FontSize="11"
+                                FontWeight="SemiBold"
+                                Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+                                Text="{Binding Index}" />
+
+                            <Ellipse
+                                Width="7"
+                                Height="7"
+                                Margin="0,0,3,3"
+                                HorizontalAlignment="Right"
+                                VerticalAlignment="Bottom"
+                                Fill="{DynamicResource AccentFillColorDefaultBrush}"
+                                Visibility="{Binding IsPrimary, Converter={StaticResource BooleanToVisibilityConverter}}"
+                                ToolTipService.ToolTip="Primary screen" />
+                        </Grid>
+                    </Border>
+                </DataTemplate>
+            </ItemsControl.ItemTemplate>
+        </ItemsControl>
+    </Grid>
+</UserControl>

src/DesktopMagic/Controls/ScreenSelector.xaml.cs

@@ -0,0 +1,182 @@
+using DesktopMagic.DataContexts;
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Drawing;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+
+namespace DesktopMagic.Controls;
+
+/// <summary>
+/// Visual screen selector showing the connected monitors as a mini-map
+/// scaled to the control's size while preserving their relative positions.
+/// </summary>
+public partial class ScreenSelector : UserControl
+{
+    public static readonly DependencyProperty ItemsSourceProperty =
+        DependencyProperty.Register(nameof(ItemsSource), typeof(IEnumerable), typeof(ScreenSelector),
+            new PropertyMetadata(null, OnItemsSourceChanged));
+
+    public IEnumerable? ItemsSource
+    {
+        get => (IEnumerable?)GetValue(ItemsSourceProperty);
+        set => SetValue(ItemsSourceProperty, value);
+    }
+
+    public static readonly DependencyProperty SelectedItemProperty =
+        DependencyProperty.Register(nameof(SelectedItem), typeof(ScreenDisplay), typeof(ScreenSelector),
+            new PropertyMetadata(null, OnSelectedItemChanged));
+
+    public ScreenDisplay? SelectedItem
+    {
+        get => (ScreenDisplay?)GetValue(SelectedItemProperty);
+        set => SetValue(SelectedItemProperty, value);
+    }
+
+    private INotifyCollectionChanged? notifySource;
+
+    /// <summary>
+    /// Raised when the user picks a screen by clicking it.
+    /// </summary>
+    public event Action? SelectionChanged;
+
+    public ScreenSelector()
+    {
+        InitializeComponent();
+    }
+
+    private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+    {
+        ScreenSelector control = (ScreenSelector)d;
+        control.AttachSource();
+        control.UpdateCanvas();
+        control.UpdateSelection();
+    }
+
+    private static void OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+    {
+        ((ScreenSelector)d).UpdateSelection();
+    }
+
+    private void AttachSource()
+    {
+        if (notifySource is INotifyCollectionChanged oldSource)
+        {
+            oldSource.CollectionChanged -= Source_CollectionChanged;
+        }
+
+        notifySource = ItemsSource as INotifyCollectionChanged;
+        if (notifySource is not null)
+        {
+            notifySource.CollectionChanged += Source_CollectionChanged;
+        }
+    }
+
+    private void Source_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
+    {
+        UpdateCanvas();
+        UpdateSelection();
+    }
+
+    private void UserControl_Loaded(object sender, RoutedEventArgs e)
+    {
+        // Re-attach in case the control was unloaded and the source instance changed.
+        AttachSource();
+        UpdateCanvas();
+    }
+
+    private void UserControl_SizeChanged(object sender, SizeChangedEventArgs e)
+    {
+        UpdateCanvas();
+    }
+
+    private void UserControl_Unloaded(object sender, RoutedEventArgs e)
+    {
+        if (notifySource is INotifyCollectionChanged source)
+        {
+            source.CollectionChanged -= Source_CollectionChanged;
+        }
+
+        notifySource = null;
+    }
+
+    /// <summary>
+    /// Scales the real screen bounds so they fit the control while keeping their
+    /// relative positions (including negative coordinates), then centers them.
+    /// </summary>
+    private void UpdateCanvas()
+    {
+        if (ItemsSource is null || ActualWidth <= 0 || ActualHeight <= 0)
+        {
+            return;
+        }
+
+        List<ScreenDisplay> screens = ItemsSource.Cast<ScreenDisplay>().ToList();
+        if (screens.Count == 0)
+        {
+            return;
+        }
+
+        // Union of all monitor bounds (virtual screen space, negative coords kept).
+        Rectangle totalBounds = new Rectangle();
+        foreach (var item in screens)
+        {
+            totalBounds = Rectangle.Union(totalBounds, item.Bounds);
+        }
+
+        // Uniform scale factor + a little margin so the mini-map never touches the edge.
+        double factor = Math.Max(totalBounds.Height / ActualHeight, totalBounds.Width / ActualWidth) + 2;
+
+        foreach (var item in screens)
+        {
+            item.X = item.Bounds.Left / factor;
+            item.Y = item.Bounds.Top / factor;
+            item.Width = item.Bounds.Width / factor;
+            item.Height = item.Bounds.Height / factor;
+        }
+
+        // Center the whole arrangement in the control.
+        double minLeft = screens.Min(item => item.X);
+        double maxRight = screens.Max(item => item.X + item.Width);
+        double minTop = screens.Min(item => item.Y);
+        double maxBottom = screens.Max(item => item.Y + item.Height);
+
+        double horizontalOffset = ((maxRight + minLeft) / 2) - (ActualWidth / 2);
+        double verticalOffset = ((maxBottom + minTop) / 2) - (ActualHeight / 2);
+
+        foreach (var item in screens)
+        {
+            item.X -= horizontalOffset;
+            item.Y -= verticalOffset;
+        }
+    }
+
+    private void UpdateSelection()
+    {
+        if (ItemsSource is null)
+        {
+            return;
+        }
+
+        foreach (ScreenDisplay item in ItemsSource)
+        {
+            item.IsSelected = item == SelectedItem;
+        }
+    }
+
+    private void Screen_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+    {
+        if (sender is FrameworkElement element && element.DataContext is ScreenDisplay screen)
+        {
+            SelectedItem = screen;
+            SelectionChanged?.Invoke();
+        }
+
+        e.Handled = true;
+    }
+}

src/DesktopMagic/DataContexts/MainWindowDataContext.cs

@@ -1,7 +1,10 @@
 using DesktopMagic.Helpers;
 using DesktopMagic.Settings;
 
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.ComponentModel;
+using System.Linq;
 using System.Runtime.CompilerServices;
 
 namespace DesktopMagic.DataContexts;
@@ -11,8 +14,11 @@ internal class MainWindowDataContext : INotifyPropertyChanged
     public event PropertyChangedEventHandler? PropertyChanged;
 
     private static DesktopMagicSettings settings = new();
+    private static string? selectedScreenDeviceName;
+    private string? selectedLayoutName;
 
     private bool isLoading = true;
+    private bool isSharing;
     private string? pluginsSearchText;
 
     public string Title =>
@@ -24,6 +30,19 @@ internal class MainWindowDataContext : INotifyPropertyChanged
 
     public string AppName => App.AppName;
 
+    /// <summary>
+    /// Whether a layout or theme is currently being uploaded to mod.io.
+    /// </summary>
+    public bool IsSharing
+    {
+        get => isSharing;
+        set
+        {
+            isSharing = value;
+            OnPropertyChanged();
+        }
+    }
+
     public DesktopMagicSettings Settings
     {
         get => settings;
@@ -34,6 +53,43 @@ internal class MainWindowDataContext : INotifyPropertyChanged
         }
     }
 
+    public ObservableCollection<ScreenDisplay> Screens { get; } = [];
+
+    public string? SelectedScreenId
+    {
+        get => selectedScreenDeviceName;
+        set
+        {
+            selectedScreenDeviceName = value;
+            UpdateSelection();
+        }
+    }
+
+    public ScreenDisplay? SelectedScreen
+    {
+        get => Screens.FirstOrDefault(screen => screen.DeviceName == SelectedScreenId);
+        set
+        {
+            if (value is not null)
+            {
+                SelectedScreenId = value.DeviceName;
+            }
+            OnPropertyChanged();
+        }
+    }
+
+    public Layout SelectedLayout => Manager.Instance.SelectedLayout;
+
+    public string? SelectedLayoutName
+    {
+        get => selectedLayoutName;
+        set
+        {
+            selectedLayoutName = value;
+            OnPropertyChanged();
+        }
+    }
+
     public bool IsLoading
     {
         get => isLoading;
@@ -76,8 +132,163 @@ internal class MainWindowDataContext : INotifyPropertyChanged
         return settings;
     }
 
+    /// <summary>
+    /// Refreshes the list of detected screens and ensures a screen is selected.
+    /// </summary>
+    public void RefreshScreens()
+    {
+        List<System.Windows.Forms.Screen> allScreens = ScreenUtilities.GetAllScreens();
+        Dictionary<string, System.Drawing.Rectangle> physicalBounds = ScreenUtilities.GetDisplayPhysicalBounds();
+
+        // Capture the hardware id of the currently selected screen so the selection can be
+        // preserved across display changes (e.g. unplug/replug renumbers device names).
+        ScreenDisplay? previousSelected = SelectedScreen;
+
+        Screens.Clear();
+        for (int i = 0; i < allScreens.Count; i++)
+        {
+            System.Windows.Forms.Screen screen = allScreens[i];
+            physicalBounds.TryGetValue(screen.DeviceName, out System.Drawing.Rectangle physicalBoundsRect);
+            Screens.Add(new ScreenDisplay(screen, i, physicalBoundsRect, ScreenUtilities.GetMonitorHardwareId(screen)));
+        }
+
+        if (selectedScreenDeviceName is null || !Screens.Any(screen => screen.DeviceName == selectedScreenDeviceName))
+        {
+            ScreenDisplay? byHardwareId = previousSelected is null
+                ? null
+                : Screens.FirstOrDefault(screen => screen.HardwareId == previousSelected.HardwareId);
+            SelectedScreenId = byHardwareId?.DeviceName ?? Screens.FirstOrDefault()?.DeviceName;
+        }
+        else
+        {
+            UpdateSelection();
+        }
+    }
+
+    /// <summary>
+    /// Raises change notifications for the currently selected screen's layout.
+    /// </summary>
+    public void RefreshSelection()
+    {
+        UpdateSelection();
+    }
+
+    /// <summary>
+    /// Keeps the manager's screen selection in sync and raises notifications for the selected layout.
+    /// </summary>
+    private void UpdateSelection()
+    {
+        Manager.Instance.SelectedScreenDeviceName = selectedScreenDeviceName;
+        selectedLayoutName = Manager.Instance.SelectedLayout.Name;
+        OnPropertyChanged(nameof(SelectedScreenId));
+        OnPropertyChanged(nameof(SelectedScreen));
+        OnPropertyChanged(nameof(SelectedLayout));
+        OnPropertyChanged(nameof(SelectedLayoutName));
+    }
+
     protected void OnPropertyChanged([CallerMemberName] string? name = null)
     {
         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
     }
+}
+
+/// <summary>
+/// A detected screen displayed in the UI.
+/// </summary>
+public class ScreenDisplay : INotifyPropertyChanged
+{
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    private bool isSelected;
+    private double x;
+    private double y;
+    private double width;
+    private double height;
+
+    public ScreenDisplay(System.Windows.Forms.Screen screen, int index, System.Drawing.Rectangle physicalBounds, string hardwareId)
+    {
+        DeviceName = screen.DeviceName;
+        DisplayName = ScreenUtilities.GetScreenLabel(screen, index);
+        Bounds = physicalBounds.Width > 0 && physicalBounds.Height > 0 ? physicalBounds : screen.Bounds;
+        IsPrimary = screen.Primary;
+        Index = index + 1;
+        HardwareId = hardwareId;
+    }
+
+    public string DeviceName { get; }
+
+    /// <summary>
+    /// Stable hardware identifier of the monitor (see <see cref="ScreenUtilities.GetMonitorHardwareId"/>),
+    /// used to persist screen bindings across display changes.
+    /// </summary>
+    public string HardwareId { get; }
+
+    public string DisplayName { get; }
+
+    public System.Drawing.Rectangle Bounds { get; }
+
+    public bool IsPrimary { get; }
+
+    public int Index { get; }
+
+    public string ToolTipText => IsPrimary ? $"{DisplayName} · Primary" : DisplayName;
+
+    /// <summary>
+    /// Whether this screen is currently selected in the screen selector.
+    /// </summary>
+    public bool IsSelected
+    {
+        get => isSelected;
+        set
+        {
+            isSelected = value;
+            OnPropertyChanged();
+        }
+    }
+
+    // Normalized (control-local) position/size set by the screen selector.
+    public double X
+    {
+        get => x;
+        set
+        {
+            x = value;
+            OnPropertyChanged();
+        }
+    }
+
+    public double Y
+    {
+        get => y;
+        set
+        {
+            y = value;
+            OnPropertyChanged();
+        }
+    }
+
+    public double Width
+    {
+        get => width;
+        set
+        {
+            width = value;
+            OnPropertyChanged();
+        }
+    }
+
+    public double Height
+    {
+        get => height;
+        set
+        {
+            height = value;
+            OnPropertyChanged();
+        }
+    }
+
+    private void OnPropertyChanged([CallerMemberName] string? name = null)
+    {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+    }
 }

src/DesktopMagic/DataContexts/PluginManagerDataContext.cs

@@ -17,9 +17,38 @@ internal class PluginManagerDataContext : INotifyPropertyChanged
     private bool isLoading = true;
     private bool isSearching;
     private bool isAuthenticated = false;
+    private ModCategory category = ModCategory.Plugins;
+
     public ObservableCollection<PluginEntryDataContext> AllPlugins { get; } = [];
     public ObservableCollection<PluginEntryDataContext> InstalledPlugins { get; } = [];
 
+    // Layouts or themes, depending on the selected category.
+    public ObservableCollection<PluginEntryDataContext> AllShared { get; } = [];
+    public ObservableCollection<PluginEntryDataContext> InstalledShared { get; } = [];
+
+    public ModCategory Category
+    {
+        get => category;
+        set
+        {
+            category = value;
+            OnPropertyChanged();
+            OnPropertyChanged(nameof(CategoryIndex));
+            OnPropertyChanged(nameof(ShownAll));
+            OnPropertyChanged(nameof(ShownInstalled));
+        }
+    }
+
+    public int CategoryIndex
+    {
+        get => (int)category;
+        set => Category = (ModCategory)value;
+    }
+
+    public ObservableCollection<PluginEntryDataContext> ShownAll => category == ModCategory.Plugins ? AllPlugins : AllShared;
+
+    public ObservableCollection<PluginEntryDataContext> ShownInstalled => category == ModCategory.Plugins ? InstalledPlugins : InstalledShared;
+
     public bool IsLoading
     {
         get => isLoading;
@@ -97,4 +126,11 @@ internal class PluginManagerDataContext : INotifyPropertyChanged
     {
         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
     }
-}
+}
+
+internal enum ModCategory
+{
+    Plugins,
+    Layouts,
+    Themes
+}

src/DesktopMagic/DesktopMagic.csproj

@@ -7,11 +7,11 @@
         <ApplicationIcon>icon.ico</ApplicationIcon>
         <RunPostBuildEvent>OnBuildSuccess</RunPostBuildEvent>
         <Authors>Stone_Red</Authors>
-        <Version>1.3.3.0</Version>
+        <Version>1.4.0.0</Version>
         <PackageProjectUrl>https://github.com/Stone-Red-Code/DesktopMagic</PackageProjectUrl>
         <RepositoryUrl>https://github.com/Stone-Red-Code/DesktopMagic</RepositoryUrl>
-        <AssemblyVersion>1.3.3.0</AssemblyVersion>
-        <FileVersion>1.3.3.0</FileVersion>
+        <AssemblyVersion>1.4.0.0</AssemblyVersion>
+        <FileVersion>1.4.0.0</FileVersion>
         <TargetFramework>net8.0-windows7.0</TargetFramework>
         <RuntimeIdentifier>win-x64</RuntimeIdentifier>
         <Nullable>enable</Nullable>
@@ -49,8 +49,8 @@
         <PackageReference Include="Interop.IWshRuntimeLibrary" Version="1.0.1" />
         <PackageReference Include="Ical.Net" Version="4.3.1" />
         <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.3650.58" />
-        <PackageReference Include="Modio" Version="1.0.0" />
         <PackageReference Include="NAudio" Version="2.2.1" />
+        <PackageReference Include="SkiaSharp" Version="4.148.0" />
         <PackageReference Include="System.Management" Version="8.0.0" />
         <PackageReference Include="WPF-UI" Version="4.2.0" />
         <PackageReference Include="WPF-UI.Markdown" Version="4.0.2" />
@@ -59,6 +59,7 @@
 
     <ItemGroup>
         <ProjectReference Include="..\DesktopMagicPluginAPI\DesktopMagic.Api.csproj" />
+        <ProjectReference Include="..\..\lib\modio.net\Modio\Modio.csproj" />
     </ItemGroup>
 
     <ItemGroup>

src/DesktopMagic/Dialogs/ScreenSelectorDialog.xaml

@@ -0,0 +1,35 @@
+<ui:FluentWindow x:Class="DesktopMagic.Dialogs.ScreenSelectorDialog"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
+        xmlns:controls="clr-namespace:DesktopMagic.Controls"
+        xmlns:dataContext="clr-namespace:DesktopMagic.DataContexts"
+        mc:Ignorable="d"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        d:DataContext="{d:DesignInstance Type=dataContext:MainWindowDataContext}"
+        ui:Design.Background="{DynamicResource ApplicationBackgroundBrush}"
+        ui:Design.Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+        Foreground="{DynamicResource TextFillColorPrimaryBrush}"
+        WindowCornerPreference="Round"
+        WindowBackdropType="Tabbed"
+        SizeToContent="Height"
+        Width="380"
+        MinWidth="380"
+        WindowStartupLocation="CenterOwner"
+        ExtendsContentIntoTitleBar="True">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+
+        <ui:TitleBar x:Name="titleBar" ShowMinimize="False" ShowMaximize="False">
+            <ui:TitleBar.Icon>
+                <ui:ImageIcon Source="{StaticResource Icon}" />
+            </ui:TitleBar.Icon>
+        </ui:TitleBar>
+
+        <controls:ScreenSelector x:Name="screenSelector" Grid.Row="1" Margin="15" Width="340" Height="200" ItemsSource="{Binding Screens}" SelectedItem="{Binding SelectedScreen, Mode=TwoWay}" />
+    </Grid>
+</ui:FluentWindow>

src/DesktopMagic/Dialogs/ScreenSelectorDialog.xaml.cs

@@ -0,0 +1,26 @@
+using DesktopMagic.DataContexts;
+
+using System.Windows;
+
+namespace DesktopMagic.Dialogs;
+
+/// <summary>
+/// Modal picker for selecting a screen from a visual monitor layout.
+/// Closes itself once a screen has been picked.
+/// </summary>
+public partial class ScreenSelectorDialog : Wpf.Ui.Controls.FluentWindow
+{
+    internal ScreenSelectorDialog(MainWindowDataContext dataContext, string title = App.AppName)
+    {
+        InitializeComponent();
+
+        Resources.MergedDictionaries.Add(App.LanguageDictionary);
+
+        DataContext = dataContext;
+        titleBar.Title = title;
+        Title = title;
+
+        // Close the dialog once a screen has been picked.
+        screenSelector.SelectionChanged += () => DialogResult = true;
+    }
+}

src/DesktopMagic/Helpers/ModIoService.cs

@@ -0,0 +1,725 @@
+using DesktopMagic.Dialogs;
+using DesktopMagic.Plugins;
+using DesktopMagic.Settings;
+
+using Modio;
+using Modio.Filters;
+using Modio.Models;
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.IO.Compression;
+using System.Linq;
+using System.Net.Http;
+using System.Text.Json.Nodes;
+using System.Threading.Tasks;
+using System.Windows;
+
+using File = System.IO.File;
+using Path = System.IO.Path;
+
+namespace DesktopMagic.Helpers;
+
+/// <summary>
+/// Shared mod.io access: authentication and sharing/syncing of layouts and themes.
+/// </summary>
+internal static class ModIoService
+{
+    public const uint GameId = 5665;
+    public const string ApiKey = "88e6ea774c3a502b06114e7fee0829ac";
+
+    private const string Source = "ModIo";
+    private const int MaxSummaryLength = 250;
+
+    private static readonly HttpClient httpClient = new();
+    private static (string Token, uint UserId)? currentUser;
+
+    public static bool IsAuthenticated => AppSettings.ModIoAccessToken is not null;
+
+    private static DesktopMagicSettings AppSettings => Manager.Instance.Settings;
+
+    public static Client CreateClient()
+    {
+        Client.Builder builder = CreateBuilder();
+
+        if (AppSettings.ModIoAccessToken is string token)
+        {
+            _ = builder.WithToken(token);
+        }
+
+        return builder.Build();
+    }
+
+    /// <summary>
+    /// The shared api.mod.io host is deprecated, requests have to go to the game specific host.
+    /// </summary>
+    private static Client.Builder CreateBuilder()
+    {
+        return Client.GetBuilder(ApiKey).WithGameHost(GameId);
+    }
+
+    /// <summary>
+    /// Whether the mod is a plugin (as opposed to a shared layout or theme).
+    /// </summary>
+    public static bool IsPluginMod(Mod mod)
+    {
+        return !mod.Tags.Any(tag => tag.Name is SharePackage.LayoutTag or SharePackage.ThemeTag);
+    }
+
+    /// <summary>
+    /// Runs the e-mail security code login. Returns false when cancelled.
+    /// </summary>
+    public static async Task<bool> LogInAsync(Window? owner, string title)
+    {
+        App.Logger.LogInfo("Starting mod.io authentication", source: Source);
+        Client client = CreateBuilder().Build();
+
+        InputDialog inputDialog = new(GetString("enterModIoEmail"), title)
+        {
+            Owner = owner,
+        };
+
+        if (inputDialog.ShowDialog() != true)
+        {
+            App.Logger.LogInfo("Authentication cancelled by user", source: Source);
+            return false;
+        }
+
+        await client.Auth.RequestCode(ApiKey, inputDialog.ResponseText);
+
+        inputDialog = new(GetString("enterModIoAccessToken"), title)
+        {
+            Owner = owner,
+        };
+
+        if (inputDialog.ShowDialog() != true)
+        {
+            App.Logger.LogInfo("Authentication cancelled by user", source: Source);
+            return false;
+        }
+
+        AccessToken accessToken = await client.Auth.SecurityCode(ApiKey, inputDialog.ResponseText);
+        if (accessToken.Value is null)
+        {
+            return false;
+        }
+
+        AppSettings.ModIoAccessToken = accessToken.Value;
+        Manager.Instance.SaveSettings();
+        App.Logger.LogInfo("Successfully authenticated with mod.io", source: Source);
+        return true;
+    }
+
+    public static void LogOut()
+    {
+        App.Logger.LogInfo("Logging out from mod.io", source: Source);
+        AppSettings.ModIoAccessToken = null;
+        currentUser = null;
+        Manager.Instance.SaveSettings();
+    }
+
+    /// <summary>
+    /// Compares the local content with the last published or downloaded version.
+    /// </summary>
+    public static void RefreshShareState(IModIoShareable item)
+    {
+        item.ShareState = item.ModIo switch
+        {
+            null => ModIoShareState.NotShared,
+            { IsOwner: false } => ModIoShareState.NotOwner,
+            { PublishedHash: string hash } when hash == SharePackage.Build(item).Hash => ModIoShareState.UpToDate,
+            _ => ModIoShareState.Modified,
+        };
+    }
+
+    /// <summary>
+    /// Publishes the item as a new mod, uploads a new version of the linked mod, or opens the mod page when nothing changed.
+    /// </summary>
+    /// <param name="setBusy">Shows or hides the caller's waiting overlay while the upload runs.</param>
+    public static async Task ShareAsync(IModIoShareable item, Window? owner, Action<bool> setBusy)
+    {
+        if (item is Layout { Name: Manager.EmptyLayoutName })
+        {
+            await ShowMessageAsync(GetString("cannotShareEmptyLayout"));
+            return;
+        }
+
+        RefreshShareState(item);
+
+        if (item.ShareState == ModIoShareState.UpToDate)
+        {
+            OpenProfile(item.ModIo?.ProfileUri);
+            return;
+        }
+
+        if (!IsAuthenticated && !await LogInAsync(owner, App.AppName))
+        {
+            return;
+        }
+
+        SharePackage.Package package = SharePackage.Build(item);
+        bool isUpdate = item.ModIo is { IsOwner: true };
+
+        string? summary = null;
+        string? changelog = null;
+
+        if (isUpdate)
+        {
+            InputDialog changelogDialog = new(GetString("enterModIoChangelog")) { Owner = owner };
+            if (changelogDialog.ShowDialog() != true)
+            {
+                return;
+            }
+
+            changelog = changelogDialog.ResponseText.Trim();
+        }
+        else
+        {
+            string warning = GetString(item is Layout ? "modIoShareLayoutWarning" : "modIoShareThemeWarning");
+            if (package.LocalPlugins.Count > 0)
+            {
+                warning += Environment.NewLine + Environment.NewLine + string.Format(GetString("modIoLocalPluginsWarning"), string.Join(", ", package.LocalPlugins));
+            }
+
+            if (!await ConfirmAsync(warning, GetString("shareOnModIo")))
+            {
+                return;
+            }
+
+            InputDialog summaryDialog = new(GetString("enterModIoSummary")) { Owner = owner };
+            if (summaryDialog.ShowDialog() != true)
+            {
+                return;
+            }
+
+            summary = summaryDialog.ResponseText.Trim();
+            if (string.IsNullOrWhiteSpace(summary))
+            {
+                summary = item.Name;
+            }
+
+            if (summary.Length > MaxSummaryLength)
+            {
+                summary = summary[..MaxSummaryLength];
+            }
+        }
+
+        string workingDirectory = Path.Combine(Path.GetTempPath(), App.AppName, Guid.NewGuid().ToString());
+        setBusy(true);
+
+        try
+        {
+            _ = Directory.CreateDirectory(workingDirectory);
+
+            string contentDirectory = Path.Combine(workingDirectory, "content");
+            _ = Directory.CreateDirectory(contentDirectory);
+            await File.WriteAllTextAsync(Path.Combine(contentDirectory, SharePackage.ContentFileName), package.Json.ToJsonString());
+
+            string zipPath = Path.Combine(workingDirectory, "content.zip");
+            ZipFile.CreateFromDirectory(contentDirectory, zipPath);
+
+            string logoPath = Path.Combine(workingDirectory, "logo.png");
+            SharePreviewRenderer.Render(item, logoPath);
+
+            Client client = CreateClient();
+            ModIoLink link;
+
+            if (isUpdate)
+            {
+                link = item.ModIo!;
+            }
+            else
+            {
+                App.Logger.LogInfo($"Creating mod.io mod for \"{item.Name}\"", source: Source);
+                NewMod newMod = new(item.Name, summary!, new FileInfo(logoPath))
+                {
+                    Visible = Modio.Models.Visibility.Public,
+                };
+                newMod.Tags.Add(SharePackage.GetTag(item));
+
+                Mod mod = await client.Games[GameId].Mods.Add(newMod);
+
+                // A downloaded item shared as a new mod no longer follows the original, which would otherwise be downloaded again.
+                if (item.ModIo is { IsOwner: false } originalLink)
+                {
+                    await UnsubscribeAsync(originalLink.ModId);
+                }
+
+                // Save the link right away, so a failed upload is retried on the same mod instead of creating another one.
+                link = new ModIoLink
+                {
+                    ModId = mod.Id,
+                    IsOwner = true,
+                    ProfileUri = mod.ProfileUrl,
+                };
+                item.ModIo = link;
+                Manager.Instance.SaveSettings();
+            }
+
+            App.Logger.LogInfo($"Uploading new version of \"{item.Name}\" (mod {link.ModId})", source: Source);
+            Modio.Models.File modfile = await client.Games[GameId].Mods[link.ModId].Files.Add(new NewFile(new FileInfo(zipPath))
+            {
+                Version = DateTime.UtcNow.ToString("yyyy.MM.dd.HHmm"),
+                Changelog = string.IsNullOrWhiteSpace(changelog) ? null : changelog,
+                Active = true,
+            }, new UploadOptions());
+
+            link.ModfileId = modfile.Id;
+            link.PublishedHash = package.Hash;
+            Manager.Instance.SaveSettings();
+
+            if (isUpdate)
+            {
+                await TryUpdateLogo(client, link.ModId, logoPath);
+            }
+
+            if (item is Layout)
+            {
+                await TryUpdateDependencies(client, link.ModId, package.RequiredPlugins);
+            }
+
+            RefreshShareState(item);
+            App.Logger.LogInfo($"Published \"{item.Name}\" on mod.io", source: Source);
+
+            setBusy(false);
+            if (await ConfirmAsync(string.Format(GetString(isUpdate ? "modIoUpdateSuccess" : "modIoShareSuccess"), item.Name), GetString("open"), GetString("close")))
+            {
+                OpenProfile(link.ProfileUri);
+            }
+        }
+        catch (UnauthorizedException ex)
+        {
+            App.Logger.LogError($"Sharing \"{item.Name}\" failed, not authorized: {ex.Message}", source: Source);
+            LogOut();
+            setBusy(false);
+            await ShowMessageAsync(GetString("modIoSessionExpired"));
+        }
+        catch (Exception ex)
+        {
+            App.Logger.LogError($"Sharing \"{item.Name}\" failed: {ex.Message}", source: Source);
+            setBusy(false);
+            await ShowMessageAsync(string.Format(GetString("modIoShareFailed"), ex.Message));
+        }
+        finally
+        {
+            setBusy(false);
+            RefreshShareState(item);
+            TryDeleteDirectory(workingDirectory);
+        }
+    }
+
+    /// <summary>
+    /// Unsubscribes from the mod an item is linked to, so deleting it locally does not bring it back on the next sync.
+    /// </summary>
+    public static async Task UnsubscribeAsync(IModIoShareable item)
+    {
+        if (item.ModIo is not null)
+        {
+            await UnsubscribeAsync(item.ModIo.ModId);
+        }
+    }
+
+    private static async Task UnsubscribeAsync(uint modId)
+    {
+        if (!IsAuthenticated)
+        {
+            return;
+        }
+
+        try
+        {
+            await CreateClient().Games[GameId].Mods.Unsubscribe(modId);
+            App.Logger.LogInfo($"Unsubscribed from mod {modId}", source: Source);
+        }
+        catch (Exception ex)
+        {
+            App.Logger.LogError($"Failed to unsubscribe from mod {modId}: {ex.Message}", source: Source);
+        }
+    }
+
+    /// <summary>
+    /// Subscribes to the mods of downloaded layouts and themes, e.g. after logging in,
+    /// so the subscription sync keeps them instead of treating them as unsubscribed.
+    /// </summary>
+    public static async Task SubscribeToLinkedItemsAsync()
+    {
+        if (!IsAuthenticated)
+        {
+            return;
+        }
+
+        Client client = CreateClient();
+
+        foreach (ModIoLink link in GetSharedItems().Select(item => item.ModIo).OfType<ModIoLink>().Where(link => !link.IsOwner).ToList())
+        {
+            try
+            {
+                await client.Games[GameId].Mods.Subscribe(link.ModId);
+                App.Logger.LogInfo($"Subscribed to mod {link.ModId}", source: Source);
+            }
+            catch (Exception ex)
+            {
+                App.Logger.LogError($"Failed to subscribe to mod {link.ModId}: {ex.Message}", source: Source);
+            }
+        }
+    }
+
+    public static IEnumerable<IModIoShareable> GetSharedItems()
+    {
+        DesktopMagicSettings settings = AppSettings;
+        return settings.Layouts.Cast<IModIoShareable>().Concat(settings.Themes);
+    }
+
+    public static IModIoShareable? FindLinkedItem(uint modId)
+    {
+        return GetSharedItems().FirstOrDefault(item => item.ModIo?.ModId == modId);
+    }
+
+    /// <summary>
+    /// Downloads a layout or theme from mod.io and subscribes to it when logged in.
+    /// </summary>
+    /// <param name="ensurePluginInstalled">Installs the mod.io plugin with the given ID if it is missing.</param>
+    /// <returns>Whether the item was installed.</returns>
+    public static async Task<bool> InstallAsync(Mod mod, Func<uint, Task> ensurePluginInstalled)
+    {
+        try
+        {
+            if (!await ApplyLatestVersionAsync(mod, FindLinkedItem(mod.Id), ensurePluginInstalled))
+            {
+                return false;
+            }
+
+            if (IsAuthenticated)
+            {
+                try
+                {
+                    await CreateClient().Games[GameId].Mods.Subscribe(mod.Id);
+                    App.Logger.LogInfo($"Subscribed to mod {mod.Id}", source: Source);
+                }
+                catch (Exception ex)
+                {
+                    App.Logger.LogError($"Failed to subscribe to mod {mod.Id}: {ex.Message}", source: Source);
+                }
+            }
+
+            Manager.Instance.SaveSettings();
+            return true;
+        }
+        catch (Exception ex)
+        {
+            App.Logger.LogError($"Failed to install \"{mod.Name}\" (mod {mod.Id}): {ex.Message}", source: Source);
+            await ShowMessageAsync(string.Format(GetString("modIoInstallFailed"), mod.Name, ex.Message));
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Updates a linked layout or theme when mod.io has a newer version.
+    /// </summary>
+    /// <returns>Whether the item changed.</returns>
+    public static async Task<bool> UpdateAsync(IModIoShareable item, Mod mod, Func<uint, Task> ensurePluginInstalled)
+    {
+        try
+        {
+            if (!await ApplyLatestVersionAsync(mod, item, ensurePluginInstalled))
+            {
+                return false;
+            }
+
+            Manager.Instance.SaveSettings();
+            return true;
+        }
+        catch (Exception ex)
+        {
+            App.Logger.LogError($"Failed to update \"{item.Name}\" (mod {mod.Id}): {ex.Message}", source: Source);
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Deletes a layout or theme locally after confirmation and unsubscribes from its mod.
+    /// The mod itself stays on mod.io.
+    /// </summary>
+    /// <returns>Whether the item was removed.</returns>
+    public static async Task<bool> RemoveAsync(IModIoShareable item)
+    {
+        DesktopMagicSettings settings = AppSettings;
+
+        string? blocker = item switch
+        {
+            Layout { Name: Manager.EmptyLayoutName } => "cannotDeleteEmptyLayout",
+            Layout when settings.Layouts.Count <= 1 => "cannotDeleteLastLayout",
+            Theme when settings.Themes.Count <= 1 => "cannotDeleteLastTheme",
+            _ => null
+        };
+
+        if (blocker is not null)
+        {
+            await ShowMessageAsync(GetString(blocker));
+            return false;
+        }
+
+        if (!await ConfirmAsync(GetString(item is Layout ? "confirmDeleteLayout" : "confirmDeleteTheme"), "Yes", "No"))
+        {
+            return false;
+        }
+
+        await UnsubscribeAsync(item);
+
+        switch (item)
+        {
+            case Layout layout:
+                Manager.Instance.RemoveLayout(layout);
+                break;
+
+            case Theme theme:
+                _ = settings.Themes.Remove(theme);
+                Manager.Instance.SaveSettings();
+                break;
+        }
+
+        App.Logger.LogInfo($"Removed \"{item.Name}\"", source: Source);
+        return true;
+    }
+
+    /// <summary>
+    /// Downloads subscribed layouts and themes that are new or have a newer version on mod.io.
+    /// </summary>
+    /// <param name="subscriptions">The user's subscribed mods for this game.</param>
+    /// <param name="ensurePluginInstalled">Installs the mod.io plugin with the given ID if it is missing.</param>
+    /// <returns>Whether any layout or theme changed.</returns>
+    public static async Task<bool> SyncSubscriptionsAsync(IReadOnlyList<Mod> subscriptions, Func<uint, Task> ensurePluginInstalled)
+    {
+        if (!IsAuthenticated)
+        {
+            return false;
+        }
+
+        bool changed = false;
+
+        List<Mod> sharedMods = subscriptions.Where(mod => !IsPluginMod(mod)).ToList();
+        App.Logger.LogInfo($"Found {sharedMods.Count} subscribed layouts and themes on mod.io", source: Source);
+
+        foreach (Mod mod in sharedMods)
+        {
+            try
+            {
+                changed |= await ApplyLatestVersionAsync(mod, FindLinkedItem(mod.Id), ensurePluginInstalled);
+            }
+            catch (Exception ex)
+            {
+                App.Logger.LogError($"Failed to install \"{mod.Name}\" (mod {mod.Id}): {ex.Message}", source: Source);
+            }
+        }
+
+        // Downloaded items whose subscription was removed on mod.io stay as local copies.
+        foreach (IModIoShareable item in GetSharedItems().Where(item => item.ModIo is { IsOwner: false } && !subscriptions.Any(mod => mod.Id == item.ModIo.ModId)).ToList())
+        {
+            App.Logger.LogInfo($"\"{item.Name}\" is no longer subscribed, keeping it as a local copy", source: Source);
+            item.ModIo = null;
+            RefreshShareState(item);
+            changed = true;
+        }
+
+        if (changed)
+        {
+            Manager.Instance.SaveSettings();
+        }
+
+        return changed;
+    }
+
+    /// <summary>
+    /// Downloads the current version of the mod into a new item, or into <paramref name="local"/> when it is outdated.
+    /// Asks before overwriting local changes. Throws when the download or import fails.
+    /// </summary>
+    /// <returns>Whether anything changed.</returns>
+    private static async Task<bool> ApplyLatestVersionAsync(Mod mod, IModIoShareable? local, Func<uint, Task> ensurePluginInstalled)
+    {
+        if (mod.Modfile?.Download?.BinaryUrl is null)
+        {
+            throw new InvalidOperationException("The mod has no file to download.");
+        }
+
+        if (local?.ModIo?.ModfileId == mod.Modfile.Id)
+        {
+            return false;
+        }
+
+        if (local?.ModIo is ModIoLink localLink && localLink.PublishedHash != SharePackage.Build(local).Hash)
+        {
+            bool overwrite = await ConfirmAsync(string.Format(GetString("modIoUpdateConflict"), local.Name), GetString("overwrite"), GetString("keepMine"));
+
+            if (!overwrite)
+            {
+                App.Logger.LogInfo($"Keeping local changes of \"{local.Name}\" instead of updating to mod {mod.Id} version {mod.Modfile.Id}", source: Source);
+
+                if (localLink.IsOwner)
+                {
+                    // The owner can publish their version over the remote one.
+                    localLink.ModfileId = mod.Modfile.Id;
+                }
+                else
+                {
+                    // Detach the local copy so it is no longer replaced by updates.
+                    await UnsubscribeAsync(local);
+                    local.ModIo = null;
+                }
+
+                return true;
+            }
+        }
+
+        App.Logger.LogInfo($"Downloading \"{mod.Name}\" (mod {mod.Id}, version {mod.Modfile.Id})", source: Source);
+        JsonObject content = await DownloadContentAsync(mod.Modfile.Download.BinaryUrl);
+
+        foreach (uint pluginId in SharePackage.GetRequiredPlugins(content).Where(id => !Manager.Instance.Plugins.ContainsKey(id)))
+        {
+            await ensurePluginInstalled(pluginId);
+        }
+
+        uint? userId = IsAuthenticated ? await GetCurrentUserIdAsync(CreateClient()) : null;
+
+        IModIoShareable item = SharePackage.Apply(content, local);
+        item.ModIo = new ModIoLink
+        {
+            ModId = mod.Id,
+            ModfileId = mod.Modfile.Id,
+            IsOwner = userId is not null && mod.SubmittedBy?.Id == userId,
+            ProfileUri = mod.ProfileUrl,
+        };
+        item.ModIo.PublishedHash = SharePackage.Build(item).Hash;
+        RefreshShareState(item);
+
+        App.Logger.LogInfo($"Installed \"{item.Name}\" from mod.io", source: Source);
+        return true;
+    }
+
+    private static async Task<JsonObject> DownloadContentAsync(Uri url)
+    {
+        using MemoryStream zipStream = new();
+        using (Stream download = await httpClient.GetStreamAsync(url))
+        {
+            await download.CopyToAsync(zipStream);
+        }
+
+        zipStream.Position = 0;
+        using ZipArchive archive = new(zipStream, ZipArchiveMode.Read);
+        ZipArchiveEntry entry = archive.GetEntry(SharePackage.ContentFileName) ?? throw new FormatException($"The download does not contain \"{SharePackage.ContentFileName}\".");
+
+        using StreamReader reader = new(entry.Open());
+        return SharePackage.Parse(await reader.ReadToEndAsync());
+    }
+
+    private static async Task<uint> GetCurrentUserIdAsync(Client client)
+    {
+        string token = AppSettings.ModIoAccessToken ?? string.Empty;
+
+        if (currentUser is not { } user || user.Token != token)
+        {
+            User me = await client.User.GetCurrentUser();
+            user = (token, me.Id);
+            currentUser = user;
+        }
+
+        return user.UserId;
+    }
+
+    private static async Task TryUpdateLogo(Client client, uint modId, string logoPath)
+    {
+        try
+        {
+            await client.Games[GameId].Mods[modId].AddMedia(new NewModMedia { Logo = new FileInfo(logoPath) });
+        }
+        catch (Exception ex)
+        {
+            App.Logger.LogWarn($"Failed to update logo of mod {modId}: {ex.Message}", source: Source);
+        }
+    }
+
+    private static async Task TryUpdateDependencies(Client client, uint modId, IReadOnlyList<uint> requiredPlugins)
+    {
+        try
+        {
+            DependenciesClient dependencies = client.Games[GameId].Mods[modId].Dependencies;
+            List<uint> current = (await dependencies.Get(false)).Select(dependency => dependency.ModId).ToList();
+
+            List<uint> removed = current.Except(requiredPlugins).ToList();
+            List<uint> added = requiredPlugins.Except(current).ToList();
+
+            if (removed.Count > 0)
+            {
+                await dependencies.Delete(removed);
+            }
+
+            if (added.Count > 0)
+            {
+                await dependencies.Add(added);
+            }
+        }
+        catch (Exception ex)
+        {
+            App.Logger.LogWarn($"Failed to update dependencies of mod {modId}: {ex.Message}", source: Source);
+        }
+    }
+
+    private static void OpenProfile(Uri? profileUri)
+    {
+        if (profileUri is null)
+        {
+            return;
+        }
+
+        _ = Process.Start(new ProcessStartInfo
+        {
+            UseShellExecute = true,
+            FileName = profileUri.ToString()
+        });
+    }
+
+    private static void TryDeleteDirectory(string path)
+    {
+        try
+        {
+            if (Directory.Exists(path))
+            {
+                Directory.Delete(path, true);
+            }
+        }
+        catch (Exception ex)
+        {
+            App.Logger.LogWarn($"Failed to delete temporary directory {path}: {ex.Message}", source: Source);
+        }
+    }
+
+    private static async Task ShowMessageAsync(string content)
+    {
+        Wpf.Ui.Controls.MessageBox messageBox = new()
+        {
+            Title = App.AppName,
+            Content = content,
+            CloseButtonText = "Ok"
+        };
+        _ = await messageBox.ShowDialogAsync();
+    }
+
+    private static async Task<bool> ConfirmAsync(string content, string confirmText, string? cancelText = null)
+    {
+        Wpf.Ui.Controls.MessageBox messageBox = new()
+        {
+            Title = App.AppName,
+            Content = content,
+            PrimaryButtonText = confirmText,
+            CloseButtonText = cancelText ?? GetString("cancel"),
+        };
+
+        return await messageBox.ShowDialogAsync() == Wpf.Ui.Controls.MessageBoxResult.Primary;
+    }
+
+    private static string GetString(string key)
+    {
+        return App.LanguageDictionary[key] as string ?? key;
+    }
+}

src/DesktopMagic/Helpers/OcclusionMonitor.cs

@@ -0,0 +1,405 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Windows;
+using System.Windows.Interop;
+using System.Windows.Threading;
+
+namespace DesktopMagic.Helpers;
+
+/// <summary>
+/// Periodically checks whether plugin windows are occluded by other top-level windows and pauses
+/// their rendering while they are (a coverage-based pause algorithm, same idea as Lively's).
+/// Pausing stops the plugin update timer, which stops re-rendering and re-uploading frames to the
+/// GPU, so fully covered widgets consume almost no resources.
+/// </summary>
+internal sealed class OcclusionMonitor : IDisposable
+{
+    private const int CheckIntervalMs = 100;
+
+    // Pause only when essentially the whole window is covered so widgets stay responsive even
+    // when a corner is overlapped by another window.
+    private const double CoverageThreshold = 0.95;
+
+    private readonly System.Timers.Timer timer = new(CheckIntervalMs);
+    private readonly Dictionary<IPluginWindow, bool> lastPaused = [];
+    private readonly object gate = new();
+    private bool disposed;
+
+    // (window, handle) pairs of the plugin windows, refreshed asynchronously on the UI thread.
+    private volatile IReadOnlyList<(IPluginWindow Window, nint Hwnd)> windowSnapshot = [];
+    private int snapshotRefreshPending;
+
+    public bool IsRunning { get; private set; }
+
+    public void Start()
+    {
+        if (IsRunning)
+        {
+            return;
+        }
+
+        timer.Elapsed += Timer_Elapsed;
+        timer.Start();
+        IsRunning = true;
+    }
+
+    private void Timer_Elapsed(object? sender, System.Timers.ElapsedEventArgs e)
+    {
+        if (disposed)
+        {
+            return;
+        }
+
+        // System.Timers.Timer can re-enter this handler on another ThreadPool thread when the
+        // previous invocation is still running, so serialize the whole pass.
+        if (!Monitor.TryEnter(gate))
+        {
+            return;
+        }
+
+        try
+        {
+            RunOcclusionPass();
+        }
+        finally
+        {
+            Monitor.Exit(gate);
+        }
+    }
+
+    private void RunOcclusionPass()
+    {
+        RequestSnapshotRefresh();
+
+        IReadOnlyList<(IPluginWindow Window, nint Hwnd)> windows = windowSnapshot;
+        HashSet<IPluginWindow> live = [.. windows.Select(item => item.Window)];
+
+        Dictionary<IPluginWindow, bool> pausedStates;
+        try
+        {
+            pausedStates = ComputePausedStates(windows);
+        }
+        catch
+        {
+            return;
+        }
+
+        foreach ((IPluginWindow window, bool paused) in pausedStates)
+        {
+            if (lastPaused.TryGetValue(window, out bool previous) && previous == paused)
+            {
+                continue;
+            }
+
+            lastPaused[window] = paused;
+
+            try
+            {
+                _ = ((Window)window).Dispatcher.InvokeAsync(() => window.SetRenderPaused(paused));
+            }
+            catch
+            {
+                // Window is closing; ignore.
+            }
+        }
+
+        // Drop tracking for windows that no longer exist.
+        foreach (IPluginWindow stale in lastPaused.Keys.Where(key => !live.Contains(key)).ToArray())
+        {
+            _ = lastPaused.Remove(stale);
+        }
+    }
+
+    /// <summary>
+    /// Posts a refresh of <see cref="windowSnapshot"/> to the UI thread without waiting for it.
+    /// The manager mutates PluginWindows on the UI thread and window handles can only be obtained
+    /// there; a snapshot that is one pass old is good enough, and the timer thread never blocks.
+    /// </summary>
+    private void RequestSnapshotRefresh()
+    {
+        // Skip when the previous refresh has not run yet (e.g. the UI thread is busy).
+        if (Interlocked.Exchange(ref snapshotRefreshPending, 1) != 0)
+        {
+            return;
+        }
+
+        try
+        {
+            _ = Application.Current.Dispatcher.InvokeAsync(() =>
+            {
+                try
+                {
+                    windowSnapshot = Manager.Instance.PluginWindows
+                        .Where(window => window.IsRunning)
+                        .Select(window => (Window: window, Hwnd: new WindowInteropHelper((Window)window).Handle))
+                        .Where(item => item.Hwnd != nint.Zero)
+                        .ToList();
+                }
+                finally
+                {
+                    _ = Interlocked.Exchange(ref snapshotRefreshPending, 0);
+                }
+            }, DispatcherPriority.Background);
+        }
+        catch
+        {
+            // The application is shutting down.
+            _ = Interlocked.Exchange(ref snapshotRefreshPending, 0);
+        }
+    }
+
+    /// <summary>
+    /// Decides for every plugin window whether it is occluded, using a single top-to-bottom pass
+    /// over all top-level windows. EnumWindows enumerates in z-order (front to back), so every
+    /// window seen before a plugin window is above it. The pass stops at the lowest plugin window.
+    /// </summary>
+    private static Dictionary<IPluginWindow, bool> ComputePausedStates(IReadOnlyList<(IPluginWindow Window, nint Hwnd)> windows)
+    {
+        Dictionary<IPluginWindow, bool> pausedStates = [];
+
+        // Plugin windows that have not been reached in z-order yet.
+        Dictionary<nint, (IPluginWindow Window, Rectangle Area)> remaining = [];
+        foreach ((IPluginWindow window, nint hwnd) in windows)
+        {
+            if (W32.GetWindowRect(hwnd, out W32.RECT rect))
+            {
+                remaining[hwnd] = (window, rect);
+            }
+        }
+
+        if (remaining.Count == 0)
+        {
+            return pausedStates;
+        }
+
+        uint currentProcessId = (uint)Environment.ProcessId;
+
+        // Visible windows above the current z-order position that overlap a remaining plugin window.
+        List<Rectangle> occluders = [];
+
+        _ = W32.EnumWindows((hwnd, _) =>
+        {
+            if (remaining.Remove(hwnd, out (IPluginWindow Window, Rectangle Area) target))
+            {
+                double coverage = ComputeCoverage(target.Area, occluders);
+                pausedStates[target.Window] = IsForegroundCovering(target.Area, hwnd) || coverage >= CoverageThreshold;
+
+                // Windows below the lowest plugin window cannot occlude anything.
+                return remaining.Count > 0;
+            }
+
+            if (TryGetOccluderRect(hwnd, currentProcessId, remaining.Values, out Rectangle occluderRect))
+            {
+                occluders.Add(occluderRect);
+            }
+
+            return true;
+        }, nint.Zero);
+
+        return pausedStates;
+    }
+
+    /// <summary>
+    /// Returns the bounds of <paramref name="hwnd"/> when it is a visible window from another process
+    /// that overlaps at least one of <paramref name="targets"/>. Cheap checks run first so the more
+    /// expensive ones only run for windows that actually overlap a plugin window.
+    /// </summary>
+    private static bool TryGetOccluderRect(nint hwnd, uint currentProcessId, IEnumerable<(IPluginWindow Window, Rectangle Area)> targets, out Rectangle occluderRect)
+    {
+        occluderRect = Rectangle.Empty;
+
+        // Only windows from other processes occlude our widgets.
+        if (!W32.IsWindowVisible(hwnd)
+            || W32.GetWindowThreadProcessId(hwnd, out uint processId) == 0
+            || processId == currentProcessId
+            || !W32.GetWindowRect(hwnd, out W32.RECT rect))
+        {
+            return false;
+        }
+
+        Rectangle bounds = rect;
+        if (!targets.Any(target => target.Area.IntersectsWith(bounds)))
+        {
+            return false;
+        }
+
+        // Only non-cloaked windows are actually visible (exclusive-fullscreen games cloak the desktop).
+        // Explorer's desktop/wallpaper host windows (WorkerW, Progman, ...) report as visible and span
+        // the whole screen but never occlude anything. Fully transparent layered overlays (game
+        // overlays etc.) span the whole screen but cannot be seen either.
+        if (IsCloaked(hwnd) || IsDesktopShellWindow(hwnd) || IsFullyTransparent(hwnd))
+        {
+            return false;
+        }
+
+        occluderRect = bounds;
+        return true;
+    }
+
+    /// <summary>
+    /// Computes how much of <paramref name="target"/> (in virtual screen coordinates) is covered by
+    /// <paramref name="occluders"/>.
+    /// </summary>
+    private static double ComputeCoverage(Rectangle target, List<Rectangle> occluders)
+    {
+        List<Rectangle> coveringRects = [];
+
+        foreach (Rectangle occluder in occluders)
+        {
+            Rectangle intersection = Rectangle.Intersect(target, occluder);
+            if (intersection.Width > 0 && intersection.Height > 0)
+            {
+                coveringRects.Add(intersection);
+            }
+        }
+
+        if (coveringRects.Count == 0 || target.Width <= 0 || target.Height <= 0)
+        {
+            return 0;
+        }
+
+        return UnionArea(coveringRects) / (double)(target.Width * target.Height);
+    }
+
+    private static bool IsForegroundCovering(Rectangle target, nint selfHwnd)
+    {
+        nint foreground = W32.GetForegroundWindow();
+        if (foreground == nint.Zero || foreground == selfHwnd)
+        {
+            return false;
+        }
+
+        if (W32.GetWindowThreadProcessId(foreground, out _) == 0)
+        {
+            return false;
+        }
+
+        // A maximized/fullscreen app from another process covering the widget pauses it.
+        _ = W32.GetWindowRect(foreground, out W32.RECT rect);
+        Rectangle intersection = Rectangle.Intersect(target, rect);
+
+        return target.Width > 0 && target.Height > 0
+            && intersection.Width >= target.Width * CoverageThreshold
+            && intersection.Height >= target.Height * CoverageThreshold;
+    }
+
+    private static bool IsCloaked(nint hwnd)
+    {
+        return W32.DwmGetWindowAttribute(hwnd, W32.DWMWA_CLOAKED, out int cloaked, sizeof(int)) == 0 && cloaked != 0;
+    }
+
+    /// <summary>
+    /// Returns true for layered windows that are fully transparent (alpha 0), i.e. invisible
+    /// overlay hosts that span the screen but never visibly occlude anything.
+    /// </summary>
+    private static bool IsFullyTransparent(nint hwnd)
+    {
+        if ((W32.GetWindowLong(hwnd, W32.GWL_EXSTYLE) & W32.WS_EX_LAYERED) == 0)
+        {
+            return false;
+        }
+
+        return W32.GetLayeredWindowAttributes(hwnd, out _, out byte alpha, out int flags)
+            && (flags & W32.LWA_ALPHA) != 0
+            && alpha == 0;
+    }
+
+    /// <summary>
+    /// Returns true for the Explorer desktop/wallpaper host windows that span the whole screen but
+    /// never visually occlude anything (wallpaper, hidden desktop icon layer, ...).
+    /// </summary>
+    private static bool IsDesktopShellWindow(nint hwnd)
+    {
+        StringBuilder className = new(256);
+        _ = W32.GetClassName(hwnd, className, className.Capacity);
+
+        return className.ToString() is "WorkerW" or "Progman" or "SHELLDLL_DefView" or "SysListView32";
+    }
+
+    /// <summary>
+    /// Computes the total (union) area of <paramref name="rects"/> using a y-scanline sweep so
+    /// overlapping windows are not double counted.
+    /// </summary>
+    private static long UnionArea(List<Rectangle> rects)
+    {
+        if (rects.Count == 0)
+        {
+            return 0;
+        }
+
+        List<int> yEdges = [];
+        foreach (Rectangle rect in rects)
+        {
+            yEdges.Add(rect.Top);
+            yEdges.Add(rect.Bottom);
+        }
+        yEdges.Sort();
+
+        long area = 0;
+        for (int i = 0; i < yEdges.Count - 1; i++)
+        {
+            int y0 = yEdges[i];
+            int y1 = yEdges[i + 1];
+            if (y0 == y1)
+            {
+                continue;
+            }
+
+            // Collect the x extents of all rects that span this band, then merge them.
+            List<(int Left, int Right)> xRanges = [];
+            foreach (Rectangle rect in rects)
+            {
+                if (rect.Top <= y0 && rect.Bottom >= y1)
+                {
+                    xRanges.Add((rect.Left, rect.Right));
+                }
+            }
+
+            if (xRanges.Count == 0)
+            {
+                continue;
+            }
+
+            xRanges.Sort((a, b) => a.Left.CompareTo(b.Left));
+            int mergedLeft = xRanges[0].Left;
+            int mergedRight = xRanges[0].Right;
+            long bandWidth = 0;
+
+            for (int j = 1; j < xRanges.Count; j++)
+            {
+                if (xRanges[j].Left <= mergedRight)
+                {
+                    mergedRight = Math.Max(mergedRight, xRanges[j].Right);
+                }
+                else
+                {
+                    bandWidth += mergedRight - mergedLeft;
+                    mergedLeft = xRanges[j].Left;
+                    mergedRight = xRanges[j].Right;
+                }
+            }
+            bandWidth += mergedRight - mergedLeft;
+
+            area += bandWidth * (y1 - y0);
+        }
+
+        return area;
+    }
+
+    public void Dispose()
+    {
+        if (disposed)
+        {
+            return;
+        }
+
+        disposed = true;
+        timer.Elapsed -= Timer_Elapsed;
+        timer.Stop();
+        timer.Dispose();
+    }
+}

src/DesktopMagic/Helpers/ScreenUtilities.cs

@@ -0,0 +1,397 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Security.Cryptography;
+using System.Text;
+using System.Windows;
+
+namespace DesktopMagic.Helpers;
+
+/// <summary>
+/// Helpers for enumerating screens and converting between percentage based
+/// positions/sizes (relative to a screen's bounds) and absolute positions.
+/// All conversions work in WPF DIP space because WPF window <see cref="Window.Left"/>,
+/// <see cref="Window.Top"/>, <see cref="Window.Width"/> and <see cref="Window.Height"/>
+/// are expressed in device independent pixels, while <see cref="System.Windows.Forms.Screen.Bounds"/>
+/// is expressed in physical pixels. Each screen is therefore converted to DIP space
+/// using its own DPI scaling factor.
+/// </summary>
+public static class ScreenUtilities
+{
+    private const uint MonitorDefaultToNearest = 0x00000002;
+
+    private const int MDT_EFFECTIVE_DPI = 0;
+
+    /// <summary>
+    /// Gets the list of all screens currently connected, in the order reported by Windows.
+    /// </summary>
+    public static List<System.Windows.Forms.Screen> GetAllScreens()
+    {
+        return System.Windows.Forms.Screen.AllScreens.ToList();
+    }
+
+    /// <summary>
+    /// Gets the screen matching the given device name (e.g. "\\.\DISPLAY1"), or null.
+    /// </summary>
+    public static System.Windows.Forms.Screen? GetScreenByDeviceName(string? deviceName)
+    {
+        if (string.IsNullOrWhiteSpace(deviceName))
+        {
+            return null;
+        }
+
+        return System.Windows.Forms.Screen.AllScreens.FirstOrDefault(screen => string.Equals(screen.DeviceName, deviceName, StringComparison.OrdinalIgnoreCase));
+    }
+
+    /// <summary>
+    /// Gets the primary screen, or the first available screen as a fallback.
+    /// </summary>
+    public static System.Windows.Forms.Screen GetPrimaryScreen()
+    {
+        return System.Windows.Forms.Screen.PrimaryScreen ?? System.Windows.Forms.Screen.AllScreens.FirstOrDefault()
+            ?? throw new InvalidOperationException("No screens detected.");
+    }
+
+    /// <summary>
+    /// Aspect ratio (Width / Height) of the screen's bounds.
+    /// </summary>
+    public static double GetAspectRatio(System.Windows.Forms.Screen screen)
+    {
+        if (screen.Bounds.Height == 0)
+        {
+            return 0;
+        }
+
+        return screen.Bounds.Width / (double)screen.Bounds.Height;
+    }
+
+    /// <summary>
+    /// Converts a percentage based position (0..1 relative to the screen bounds) to an absolute
+    /// WPF position (DIPs) on that screen.
+    /// </summary>
+    public static Point PercentToPosition(Point percent, System.Drawing.Rectangle bounds)
+    {
+        Rect dips = GetScreenDips(bounds);
+        return new Point(
+            dips.Left + (percent.X * dips.Width),
+            dips.Top + (percent.Y * dips.Height));
+    }
+
+    /// <summary>
+    /// Converts an absolute WPF position (DIPs) to a percentage (0..1) of the screen bounds.
+    /// </summary>
+    public static Point PositionToPercent(Point position, System.Drawing.Rectangle bounds)
+    {
+        Rect dips = GetScreenDips(bounds);
+        if (dips.Width == 0 || dips.Height == 0)
+        {
+            return new Point(0.05, 0.05);
+        }
+
+        return new Point(
+            (position.X - dips.Left) / dips.Width,
+            (position.Y - dips.Top) / dips.Height);
+    }
+
+    /// <summary>
+    /// Converts a percentage based size (0..1 of the screen bounds) to an absolute WPF size (DIPs).
+    /// </summary>
+    public static Point PercentSizeToSize(Point percent, System.Drawing.Rectangle bounds)
+    {
+        Rect dips = GetScreenDips(bounds);
+        return new Point(
+            percent.X * dips.Width,
+            percent.Y * dips.Height);
+    }
+
+    /// <summary>
+    /// Converts an absolute WPF size (DIPs) to a percentage (0..1) of the screen bounds.
+    /// </summary>
+    public static Point SizeToPercent(Point size, System.Drawing.Rectangle bounds)
+    {
+        Rect dips = GetScreenDips(bounds);
+        if (dips.Width == 0 || dips.Height == 0)
+        {
+            return new Point(0.3, 0.3);
+        }
+
+        return new Point(
+            size.X / dips.Width,
+            size.Y / dips.Height);
+    }
+
+    /// <summary>
+    /// Window hook that keeps a window inside the given screen bounds. <see cref="Window.LocationChanged"/>
+    /// fires only after a move has already happened, and the system move loop overrides any correction
+    /// made there on the next mouse move, so the proposed position is adjusted in WM_WINDOWPOSCHANGING
+    /// instead, which every move and resize goes through. The position and the bounds are both in this
+    /// process' screen coordinates, so no DIP conversion is needed.
+    /// </summary>
+    public static IntPtr ClampToScreenHook(IntPtr hwnd, int msg, IntPtr lParam, System.Drawing.Rectangle bounds)
+    {
+        if (msg != NativeMethods.WM_WINDOWPOSCHANGING || bounds.Width == 0 || bounds.Height == 0)
+        {
+            return IntPtr.Zero;
+        }
+
+        NativeMethods.WINDOWPOS pos = Marshal.PtrToStructure<NativeMethods.WINDOWPOS>(lParam);
+        if ((pos.flags & NativeMethods.SWP_NOMOVE) != 0)
+        {
+            return IntPtr.Zero;
+        }
+
+        int width = pos.cx;
+        int height = pos.cy;
+        if ((pos.flags & NativeMethods.SWP_NOSIZE) != 0)
+        {
+            if (!W32.GetWindowRect(hwnd, out W32.RECT current))
+            {
+                return IntPtr.Zero;
+            }
+
+            width = current.Width;
+            height = current.Height;
+        }
+
+        int x = width <= bounds.Width ? Math.Clamp(pos.x, bounds.Left, bounds.Right - width) : bounds.Left;
+        int y = height <= bounds.Height ? Math.Clamp(pos.y, bounds.Top, bounds.Bottom - height) : bounds.Top;
+
+        if (x != pos.x || y != pos.y)
+        {
+            pos.x = x;
+            pos.y = y;
+            Marshal.StructureToPtr(pos, lParam, false);
+        }
+
+        return IntPtr.Zero;
+    }
+
+    /// <summary>
+    /// Builds a human readable label for a screen, e.g. "Display 1 · DELL U2715H · 3840x2160".
+    /// </summary>
+    public static string GetScreenLabel(System.Windows.Forms.Screen screen, int index)
+    {
+        string name = GetFriendlyName(screen);
+        string resolution = $"{screen.Bounds.Width}x{screen.Bounds.Height}";
+
+        return string.IsNullOrWhiteSpace(name) || string.Equals(name, "Generic PnP Monitor", StringComparison.OrdinalIgnoreCase)
+            ? $"Display {index + 1} · {resolution}"
+            : $"Display {index + 1} · {name} · {resolution}";
+    }
+
+    /// <summary>
+    /// Gets the friendly monitor model name (e.g. "DELL U2715H") for the given screen,
+    /// or an empty string when it cannot be determined.
+    /// </summary>
+    public static string GetFriendlyName(System.Windows.Forms.Screen screen)
+    {
+        return GetMonitorDisplayDevice(screen)?.DeviceString ?? string.Empty;
+    }
+
+    /// <summary>
+    /// Gets a stable hardware identifier for the screen: the PnP device instance ID of its
+    /// monitor (e.g. "MONITOR\DEL41F1\{...}\{0001}"), which is derived from the monitor's
+    /// EDID and survives disconnects and reconnects of the same monitor. When no hardware ID
+    /// is available (e.g. virtual or remote displays), a deterministic SHA-256 hash of the
+    /// bounds is used so the identifier is never empty.
+    /// </summary>
+    public static string GetMonitorHardwareId(System.Windows.Forms.Screen screen)
+    {
+        string? deviceId = GetMonitorDisplayDevice(screen)?.DeviceID;
+        if (!string.IsNullOrWhiteSpace(deviceId))
+        {
+            return deviceId;
+        }
+
+        System.Drawing.Rectangle bounds = screen.Bounds;
+        string boundsString = $"{bounds.X}-{bounds.Y}-{bounds.Width}-{bounds.Height}";
+        string hashString = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(boundsString))).ToLowerInvariant();
+        return $"DISPLAY#{hashString}";
+    }
+
+    /// <summary>
+    /// Gets the monitor device info (second-level <see cref="EnumDisplayDevices"/> entry) for
+    /// the given screen, or null when it cannot be determined.
+    /// </summary>
+    private static DISPLAY_DEVICE? GetMonitorDisplayDevice(System.Windows.Forms.Screen screen)
+    {
+        try
+        {
+            DISPLAY_DEVICE device = new DISPLAY_DEVICE { cb = (uint)Marshal.SizeOf<DISPLAY_DEVICE>() };
+            if (EnumDisplayDevices(screen.DeviceName, 0, ref device, 0))
+            {
+                DISPLAY_DEVICE monitor = new DISPLAY_DEVICE { cb = (uint)Marshal.SizeOf<DISPLAY_DEVICE>() };
+                if (EnumDisplayDevices(device.DeviceName, 0, ref monitor, 0))
+                {
+                    return monitor;
+                }
+            }
+        }
+        catch (Exception)
+        {
+            // Fall through to null.
+        }
+
+        return null;
+    }
+
+    /// <summary>
+    /// Enumerates monitors in a Per-Monitor V2 DPI awareness context and returns each
+    /// monitor's bounds in physical (device) pixels on the virtual screen, keyed by device
+    /// name (e.g. "\\.\DISPLAY1"). This uses the same coordinate space as DPI-aware apps
+    /// such as Lively Wallpaper, keeping multi-screen layouts with mixed DPI scaling
+    /// consistent regardless of this app's own DPI awareness mode.
+    /// </summary>
+    public static Dictionary<string, System.Drawing.Rectangle> GetDisplayPhysicalBounds()
+    {
+        Dictionary<string, System.Drawing.Rectangle> result = new Dictionary<string, System.Drawing.Rectangle>();
+
+        IntPtr prevContext = IntPtr.Zero;
+        bool contextChanged = false;
+        try
+        {
+            prevContext = SetThreadDpiAwarenessContext((IntPtr)DpiAwarenessContextPerMonitorV2);
+            contextChanged = prevContext != IntPtr.Zero;
+        }
+        catch (Exception)
+        {
+            // SetThreadDpiAwarenessContext unavailable; fall back to default context.
+        }
+
+        try
+        {
+            _ = EnumDisplayMonitors(IntPtr.Zero, IntPtr.Zero, (hMonitor, hdcMonitor, lprcMonitor, dwData) =>
+            {
+                MONITORINFOEX info = new MONITORINFOEX { cbSize = (uint)Marshal.SizeOf<MONITORINFOEX>() };
+                if (GetMonitorInfo(hMonitor, ref info))
+                {
+                    string deviceName = info.szDevice.TrimEnd('\0');
+                    result[deviceName] = new System.Drawing.Rectangle(
+                        info.rcMonitor.Left, info.rcMonitor.Top,
+                        info.rcMonitor.Right - info.rcMonitor.Left,
+                        info.rcMonitor.Bottom - info.rcMonitor.Top);
+                }
+
+                return true;
+            }, IntPtr.Zero);
+        }
+        finally
+        {
+            if (contextChanged)
+            {
+                _ = SetThreadDpiAwarenessContext(prevContext);
+            }
+        }
+
+        return result;
+    }
+
+    /// <summary>
+    /// Gets the screen bounds converted to WPF DIP space using the screen's own DPI scaling factor.
+    /// </summary>
+    private static Rect GetScreenDips(System.Drawing.Rectangle bounds)
+    {
+        double scale = GetDpiScale(bounds);
+        return new Rect(bounds.Left / scale, bounds.Top / scale, bounds.Width / scale, bounds.Height / scale);
+    }
+
+    /// <summary>
+    /// Gets the DPI scaling factor (relative to 96 DPI) of the screen containing the given bounds.
+    /// </summary>
+    private static double GetDpiScale(System.Drawing.Rectangle bounds)
+    {
+        try
+        {
+            POINT center = new POINT
+            {
+                X = bounds.Left + (bounds.Width / 2),
+                Y = bounds.Top + (bounds.Height / 2)
+            };
+            IntPtr monitor = MonitorFromPoint(center, MonitorDefaultToNearest);
+            if (GetDpiForMonitor(monitor, MDT_EFFECTIVE_DPI, out uint dpiX, out _) == 0)
+            {
+                return dpiX / 96.0;
+            }
+        }
+        catch (Exception)
+        {
+            // Fall through to no scaling if DPI APIs are unavailable.
+        }
+
+        return 1.0;
+    }
+
+    [DllImport("user32.dll")]
+    private static extern IntPtr MonitorFromPoint(POINT point, uint dwFlags);
+
+    [DllImport("shcore.dll")]
+    private static extern int GetDpiForMonitor(IntPtr hMonitor, int dpiType, out uint dpiX, out uint dpiY);
+
+    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+    private static extern bool EnumDisplayDevices(string? lpDevice, uint iDevNum, ref DISPLAY_DEVICE lpDisplayDevice, uint dwFlags);
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+    private struct DISPLAY_DEVICE
+    {
+        public uint cb;
+
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
+        public string DeviceName;
+
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
+        public string DeviceString;
+
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
+        public string DeviceID;
+
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
+        public string DeviceKey;
+
+        public uint StateFlags;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct POINT
+    {
+        public int X;
+        public int Y;
+    }
+
+    private const long DpiAwarenessContextPerMonitorV2 = -4;
+
+    private delegate bool EnumMonitorsProc(IntPtr hMonitor, IntPtr hdcMonitor, IntPtr lprcMonitor, IntPtr dwData);
+
+    [DllImport("user32.dll")]
+    private static extern IntPtr SetThreadDpiAwarenessContext(IntPtr dpiContext);
+
+    [DllImport("user32.dll")]
+    private static extern bool EnumDisplayMonitors(IntPtr hdc, IntPtr lprcClip, EnumMonitorsProc lpfnEnum, IntPtr dwData);
+
+    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+    private static extern bool GetMonitorInfo(IntPtr hMonitor, ref MONITORINFOEX lpmi);
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct MONITORRECT
+    {
+        public int Left;
+        public int Top;
+        public int Right;
+        public int Bottom;
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+    private struct MONITORINFOEX
+    {
+        public uint cbSize;
+
+        public MONITORRECT rcMonitor;
+
+        public MONITORRECT rcWork;
+
+        public uint dwFlags;
+
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
+        public string szDevice;
+    }
+}

src/DesktopMagic/Helpers/SharePackage.cs

@@ -0,0 +1,327 @@
+using DesktopMagic.Plugins;
+using DesktopMagic.Settings;
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+
+namespace DesktopMagic.Helpers;
+
+/// <summary>
+/// Converts layouts and themes to and from the portable JSON content that is uploaded to mod.io.
+/// </summary>
+internal static class SharePackage
+{
+    public const int FormatVersion = 1;
+    public const string LayoutTag = "Layout";
+    public const string ThemeTag = "Theme";
+    public const string ContentFileName = "content.json";
+
+    private static readonly JsonSerializerOptions jsonOptions = new()
+    {
+        Converters = { new ColorJsonConverter() }
+    };
+
+    /// <param name="Json">The content written to <see cref="ContentFileName"/>.</param>
+    /// <param name="Hash">Hash of the shared content, used to detect local changes.</param>
+    /// <param name="RequiredPlugins">mod.io plugin IDs the layout uses.</param>
+    /// <param name="LocalPlugins">Names of locally developed plugins the layout uses, which others cannot install.</param>
+    public sealed record Package(JsonObject Json, string Hash, IReadOnlyList<uint> RequiredPlugins, IReadOnlyList<string> LocalPlugins);
+
+    public static string GetTag(IModIoShareable item) => item is Layout ? LayoutTag : ThemeTag;
+
+    public static Package Build(IModIoShareable item)
+    {
+        return item switch
+        {
+            Layout layout => BuildLayout(layout),
+            Theme theme => BuildTheme(theme),
+            _ => throw new ArgumentException($"Unsupported item type {item.GetType().Name}", nameof(item))
+        };
+    }
+
+    private static Package BuildTheme(Theme theme)
+    {
+        JsonObject root = new()
+        {
+            ["format"] = FormatVersion,
+            ["type"] = ThemeTag,
+            ["themes"] = new JsonArray(SerializeTheme(theme)),
+        };
+
+        return new Package(root, ComputeHash(root), [], []);
+    }
+
+    private static Package BuildLayout(Layout layout)
+    {
+        DesktopMagicSettings settings = Manager.Instance.Settings;
+        IReadOnlyDictionary<uint, InternalPluginData> installedPlugins = Manager.Instance.Plugins;
+
+        Layout copy = new(layout.Name)
+        {
+            ScreenAspectRatio = layout.ScreenAspectRatio,
+        };
+
+        List<string> themeNames = [layout.Theme.Name];
+        List<uint> requiredPlugins = [];
+        List<string> localPlugins = [];
+
+        // Only enabled widgets are shared. Disabled entries are just placeholders for every installed plugin.
+        foreach ((uint pluginId, PluginSettings pluginSettings) in layout.Plugins.Where(kvp => kvp.Value.Enabled).OrderBy(kvp => kvp.Key))
+        {
+            copy.Plugins[pluginId] = new PluginSettings
+            {
+                Enabled = true,
+                Position = pluginSettings.Position,
+                Size = pluginSettings.Size,
+                CurrentThemeName = pluginSettings.CurrentThemeName,
+                Settings = pluginSettings.Settings.Where(setting => setting.Shareable).ToList(),
+            };
+
+            if (pluginSettings.CurrentThemeName is not null && settings.Themes.Any(t => t.Name == pluginSettings.CurrentThemeName) && !themeNames.Contains(pluginSettings.CurrentThemeName))
+            {
+                themeNames.Add(pluginSettings.CurrentThemeName);
+            }
+
+            // Built-in plugins have no directory and are available everywhere.
+            if (installedPlugins.TryGetValue(pluginId, out InternalPluginData? pluginData) && !string.IsNullOrEmpty(pluginData.DirectoryPath))
+            {
+                if (pluginData.Metadata.IsLocalPlugin)
+                {
+                    localPlugins.Add(pluginData.Metadata.Name);
+                }
+                else
+                {
+                    requiredPlugins.Add(pluginId);
+                }
+            }
+        }
+
+        copy.CurrentThemeName = layout.Theme.Name;
+
+        JsonObject layoutNode = JsonSerializer.SerializeToNode(copy, jsonOptions)!.AsObject();
+        _ = layoutNode.Remove(nameof(Layout.ModIo));
+
+        JsonArray themesNode = [];
+        foreach (string themeName in themeNames)
+        {
+            Theme? theme = settings.Themes.FirstOrDefault(t => t.Name == themeName);
+            if (theme is not null)
+            {
+                themesNode.Add(SerializeTheme(theme));
+            }
+        }
+
+        JsonObject root = new()
+        {
+            ["format"] = FormatVersion,
+            ["type"] = LayoutTag,
+            ["layout"] = layoutNode,
+            ["themes"] = themesNode,
+        };
+
+        // Required plugins are derived from the layout and depend on what is currently loaded, so they are not part of the hash.
+        string hash = ComputeHash(root);
+        root["requiredPlugins"] = new JsonArray(requiredPlugins.Select(id => (JsonNode)id).ToArray());
+
+        return new Package(root, hash, requiredPlugins, localPlugins);
+    }
+
+    public static JsonObject Parse(string json)
+    {
+        JsonObject root = JsonNode.Parse(json)?.AsObject() ?? throw new FormatException("The downloaded content is empty.");
+
+        int format = root["format"]?.GetValue<int>() ?? 0;
+        if (format is < 1 or > FormatVersion)
+        {
+            throw new FormatException($"Unsupported content format {format}. Please update DesktopMagic.");
+        }
+
+        return root;
+    }
+
+    public static IReadOnlyList<uint> GetRequiredPlugins(JsonObject root)
+    {
+        return root["requiredPlugins"]?.AsArray().Select(node => node!.GetValue<uint>()).ToList() ?? [];
+    }
+
+    /// <summary>
+    /// Adds the downloaded content to the settings, or updates <paramref name="existing"/> with it.
+    /// </summary>
+    public static IModIoShareable Apply(JsonObject root, IModIoShareable? existing)
+    {
+        DesktopMagicSettings settings = Manager.Instance.Settings;
+        string type = root["type"]?.GetValue<string>() ?? string.Empty;
+
+        List<Theme> themes = root["themes"]?.AsArray()
+            .Select(node => node.Deserialize<Theme>(jsonOptions))
+            .OfType<Theme>()
+            .ToList() ?? [];
+
+        if (type == ThemeTag)
+        {
+            Theme incoming = themes.FirstOrDefault() ?? throw new FormatException("The downloaded theme is empty.");
+            incoming.ModIo = null;
+
+            if (existing is Theme existingTheme)
+            {
+                CopyThemeValues(incoming, existingTheme);
+                return existingTheme;
+            }
+
+            incoming.Name = GetUniqueName(incoming.Name, settings.Themes.Select(t => t.Name));
+            settings.Themes.Add(incoming);
+            return incoming;
+        }
+
+        if (type != LayoutTag)
+        {
+            throw new FormatException($"Unknown content type \"{type}\".");
+        }
+
+        JsonObject layoutNode = root["layout"]?.AsObject() ?? throw new FormatException("The downloaded layout is empty.");
+        Layout incomingLayout = layoutNode.Deserialize<Layout>(jsonOptions) ?? throw new FormatException("The downloaded layout is invalid.");
+        string layoutName = existing?.Name ?? GetUniqueName(incomingLayout.Name, settings.Layouts.Select(l => l.Name));
+
+        Dictionary<string, string> themeNameMap = [];
+        foreach (Theme theme in themes)
+        {
+            themeNameMap[theme.Name] = AddEmbeddedTheme(theme, layoutName);
+        }
+
+        // Read the raw name, the getter falls back to another theme when the name does not exist yet.
+        string? layoutThemeName = layoutNode[nameof(Layout.CurrentThemeName)]?.GetValue<string>();
+        string? mappedLayoutThemeName = layoutThemeName is not null && themeNameMap.TryGetValue(layoutThemeName, out string? mapped) ? mapped : layoutThemeName;
+
+        Layout target = existing as Layout ?? new Layout(layoutName);
+
+        Dictionary<uint, PluginSettings> plugins = [];
+        foreach ((uint pluginId, PluginSettings incomingPlugin) in incomingLayout.Plugins)
+        {
+            if (incomingPlugin.CurrentThemeName is not null && themeNameMap.TryGetValue(incomingPlugin.CurrentThemeName, out string? pluginThemeName))
+            {
+                incomingPlugin.CurrentThemeName = pluginThemeName;
+            }
+
+            // Keep values that are never shared (e.g. URLs or locations) and saved widget data from the local copy.
+            if (target.Plugins.TryGetValue(pluginId, out PluginSettings? localPlugin))
+            {
+                incomingPlugin.State = localPlugin.State;
+                incomingPlugin.Settings = [.. incomingPlugin.Settings, .. localPlugin.Settings.Where(local => !incomingPlugin.Settings.Exists(s => s.Id == local.Id))];
+            }
+
+            incomingPlugin.Owner = target;
+            plugins[pluginId] = incomingPlugin;
+        }
+
+        // Widgets the new version no longer uses are disabled, keeping their settings.
+        foreach ((uint pluginId, PluginSettings localPlugin) in target.Plugins.Where(kvp => !plugins.ContainsKey(kvp.Key)))
+        {
+            localPlugin.Enabled = false;
+            plugins[pluginId] = localPlugin;
+        }
+
+        target.ScreenAspectRatio = incomingLayout.ScreenAspectRatio;
+        target.Plugins = plugins;
+        target.CurrentThemeName = mappedLayoutThemeName;
+
+        if (existing is null)
+        {
+            settings.Layouts.Add(target);
+        }
+
+        return target;
+    }
+
+    /// <summary>
+    /// Adds a theme that is embedded in a layout and returns the local name it is available under.
+    /// </summary>
+    private static string AddEmbeddedTheme(Theme theme, string layoutName)
+    {
+        DesktopMagicSettings settings = Manager.Instance.Settings;
+        theme.ModIo = null;
+
+        Theme? sameName = settings.Themes.FirstOrDefault(t => t.Name == theme.Name);
+        if (sameName is null)
+        {
+            settings.Themes.Add(theme);
+            return theme.Name;
+        }
+
+        if (HasSameValues(sameName, theme))
+        {
+            return sameName.Name;
+        }
+
+        // A different theme with the same name exists (e.g. "Default"). Use a name tied to the layout,
+        // which later updates of the same layout overwrite instead of adding more copies.
+        string layoutThemeName = $"{theme.Name} ({layoutName})";
+        Theme? layoutTheme = settings.Themes.FirstOrDefault(t => t.Name == layoutThemeName);
+
+        if (layoutTheme is null)
+        {
+            theme.Name = layoutThemeName;
+            settings.Themes.Add(theme);
+        }
+        else
+        {
+            CopyThemeValues(theme, layoutTheme);
+        }
+
+        return layoutThemeName;
+    }
+
+    private static void CopyThemeValues(Theme source, Theme target)
+    {
+        target.PrimaryColor = source.PrimaryColor;
+        target.SecondaryColor = source.SecondaryColor;
+        target.BackgroundColor = source.BackgroundColor;
+        target.Font = source.Font;
+        target.CornerRadius = source.CornerRadius;
+        target.Margin = source.Margin;
+    }
+
+    private static bool HasSameValues(Theme a, Theme b)
+    {
+        JsonObject nodeA = SerializeTheme(a);
+        JsonObject nodeB = SerializeTheme(b);
+        _ = nodeA.Remove(nameof(Theme.Name));
+        _ = nodeB.Remove(nameof(Theme.Name));
+
+        return JsonNode.DeepEquals(nodeA, nodeB);
+    }
+
+    private static JsonObject SerializeTheme(Theme theme)
+    {
+        JsonObject node = JsonSerializer.SerializeToNode(theme, jsonOptions)!.AsObject();
+        _ = node.Remove(nameof(Theme.ModIo));
+        return node;
+    }
+
+    private static string GetUniqueName(string name, IEnumerable<string> existingNames)
+    {
+        HashSet<string> names = existingNames.ToHashSet();
+        if (!names.Contains(name))
+        {
+            return name;
+        }
+
+        int index = 2;
+        while (names.Contains($"{name} ({index})"))
+        {
+            index++;
+        }
+
+        return $"{name} ({index})";
+    }
+
+    private static string ComputeHash(JsonObject root)
+    {
+        byte[] hash = SHA256.HashData(Encoding.UTF8.GetBytes(root.ToJsonString()));
+        return Convert.ToHexString(hash);
+    }
+}

src/DesktopMagic/Helpers/SharePreviewRenderer.cs

@@ -0,0 +1,148 @@
+using DesktopMagic.Plugins;
+using DesktopMagic.Settings;
+
+using System;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+using Point = System.Windows.Point;
+
+namespace DesktopMagic.Helpers;
+
+/// <summary>
+/// Renders the logo image used for layouts and themes on mod.io (mod.io requires one, at least 512x288).
+/// </summary>
+internal static class SharePreviewRenderer
+{
+    private const int Width = 1280;
+    private const int Height = 720;
+
+    private static readonly Color canvasColor = Color.FromRgb(0x1C, 0x1C, 0x24);
+    private static readonly Color screenColor = Color.FromRgb(0x2E, 0x2E, 0x3A);
+
+    public static void Render(IModIoShareable item, string path)
+    {
+        DrawingVisual visual = new();
+
+        using (DrawingContext context = visual.RenderOpen())
+        {
+            context.DrawRectangle(new SolidColorBrush(canvasColor), null, new Rect(0, 0, Width, Height));
+
+            switch (item)
+            {
+                case Layout layout:
+                    DrawLayout(context, layout);
+                    break;
+
+                case Theme theme:
+                    DrawTheme(context, theme);
+                    break;
+            }
+        }
+
+        RenderTargetBitmap bitmap = new(Width, Height, 96, 96, PixelFormats.Pbgra32);
+        bitmap.Render(visual);
+
+        PngBitmapEncoder encoder = new();
+        encoder.Frames.Add(BitmapFrame.Create(bitmap));
+
+        using FileStream stream = File.Create(path);
+        encoder.Save(stream);
+    }
+
+    private static void DrawLayout(DrawingContext context, Layout layout)
+    {
+        const double padding = 60;
+        double aspectRatio = layout.ScreenAspectRatio > 0 ? layout.ScreenAspectRatio : 16.0 / 9.0;
+
+        double availableWidth = Width - (padding * 2);
+        double availableHeight = Height - (padding * 2);
+        double screenWidth = Math.Min(availableWidth, availableHeight * aspectRatio);
+        double screenHeight = screenWidth / aspectRatio;
+
+        Rect screen = new((Width - screenWidth) / 2, (Height - screenHeight) / 2, screenWidth, screenHeight);
+        context.DrawRoundedRectangle(new SolidColorBrush(screenColor), null, screen, 12, 12);
+
+        foreach ((uint pluginId, PluginSettings pluginSettings) in layout.Plugins.Where(kvp => kvp.Value.Enabled))
+        {
+            Theme theme = pluginSettings.Theme;
+
+            Rect widget = new(
+                screen.X + (pluginSettings.Position.X * screen.Width),
+                screen.Y + (pluginSettings.Position.Y * screen.Height),
+                Math.Max(4, pluginSettings.Size.X * screen.Width),
+                Math.Max(4, pluginSettings.Size.Y * screen.Height));
+            widget.Intersect(screen);
+
+            if (widget.IsEmpty)
+            {
+                continue;
+            }
+
+            Color background = MultiColorConverter.ConvertToMediaColor(theme.BackgroundColor);
+            if (background.A < 0x30)
+            {
+                background = Color.FromArgb(0x30, 0xFF, 0xFF, 0xFF);
+            }
+
+            Color primary = MultiColorConverter.ConvertToMediaColor(theme.PrimaryColor);
+            double radius = Math.Min(theme.CornerRadius * screen.Width / 1920, Math.Min(widget.Width, widget.Height) / 2);
+
+            context.DrawRoundedRectangle(new SolidColorBrush(background), new Pen(new SolidColorBrush(primary), 2), widget, radius, radius);
+
+            string name = Manager.Instance.Plugins.TryGetValue(pluginId, out InternalPluginData? pluginData) ? pluginData.Metadata.Name : pluginSettings.Metadata.Name;
+            if (string.IsNullOrWhiteSpace(name))
+            {
+                continue;
+            }
+
+            FormattedText text = CreateText(name, theme.Font, Math.Clamp(widget.Height / 4, 10, 28), primary);
+            text.MaxTextWidth = Math.Max(1, widget.Width - 12);
+            text.MaxTextHeight = Math.Max(1, widget.Height - 8);
+            text.Trimming = TextTrimming.CharacterEllipsis;
+
+            context.DrawText(text, new Point(widget.X + 6, widget.Y + ((widget.Height - Math.Min(text.Height, text.MaxTextHeight)) / 2)));
+        }
+    }
+
+    private static void DrawTheme(DrawingContext context, Theme theme)
+    {
+        Color background = MultiColorConverter.ConvertToMediaColor(theme.BackgroundColor);
+        Color primary = MultiColorConverter.ConvertToMediaColor(theme.PrimaryColor);
+        Color secondary = MultiColorConverter.ConvertToMediaColor(theme.SecondaryColor);
+
+        Rect card = new(120, 100, Width - 240, Height - 200);
+        double radius = Math.Clamp(theme.CornerRadius * 2, 0, card.Height / 2);
+
+        context.DrawRoundedRectangle(new SolidColorBrush(screenColor), null, card, radius, radius);
+        context.DrawRoundedRectangle(new SolidColorBrush(background), null, card, radius, radius);
+
+        FormattedText title = CreateText(theme.Name, theme.Font, 96, primary);
+        title.MaxTextWidth = card.Width - 120;
+        title.MaxLineCount = 1;
+        title.Trimming = TextTrimming.CharacterEllipsis;
+        context.DrawText(title, new Point(card.X + 60, card.Y + 60));
+
+        FormattedText subtitle = CreateText(theme.Font, theme.Font, 48, secondary);
+        subtitle.MaxTextWidth = card.Width - 120;
+        subtitle.MaxLineCount = 1;
+        subtitle.Trimming = TextTrimming.CharacterEllipsis;
+        context.DrawText(subtitle, new Point(card.X + 60, card.Y + 60 + title.Height + 10));
+
+        Color[] swatches = [primary, secondary, background];
+        for (int i = 0; i < swatches.Length; i++)
+        {
+            Point center = new(card.X + 110 + (i * 130), card.Bottom - 110);
+            context.DrawEllipse(new SolidColorBrush(swatches[i]), new Pen(new SolidColorBrush(Color.FromArgb(0x60, 0x80, 0x80, 0x80)), 3), center, 50, 50);
+        }
+    }
+
+    private static FormattedText CreateText(string text, string font, double size, Color color)
+    {
+        return new FormattedText(text, CultureInfo.CurrentUICulture, FlowDirection.LeftToRight, new Typeface(font), size, new SolidColorBrush(color), 1.0);
+    }
+}

src/DesktopMagic/Helpers/Win32Wrapper.cs

@@ -10,6 +10,18 @@ internal class W32
 
     public const int SM_CYSCREEN = 1;
 
+    public const int DWMWA_CLOAKED = 14;
+
+    public const int GWL_EXSTYLE = -20;
+
+    public const uint GW_HWNDNEXT = 2;
+
+    public const uint GW_HWNDPREV = 3;
+
+    public const int LWA_ALPHA = 0x2;
+
+    public const long WS_EX_LAYERED = 0x00080000L;
+
     public const int SPI_SETDESKWALLPAPER = 20;
     public const int SPIF_SENDWININICHANGE = 0x02;
     public const int SPIF_UPDATEINIFILE = 0x01;
@@ -55,6 +67,26 @@ internal class W32
     [DllImport("dwmapi.dll")]
     public static extern int DwmSetWindowAttribute(nint hwnd, int attr, ref int attrValue, int attrSize);
 
+    [DllImport("dwmapi.dll")]
+    public static extern int DwmGetWindowAttribute(nint hwnd, int dwAttribute, out int pvAttribute, int cbAttribute);
+
+    [DllImport("user32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static extern bool GetWindowRect(nint hWnd, out RECT lpRect);
+
+    [DllImport("user32.dll")]
+    public static extern int GetWindowLong(nint hWnd, int nIndex);
+
+    [DllImport("user32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static extern bool GetLayeredWindowAttributes(nint hWnd, out int colorKey, out byte alpha, out int dwFlags);
+
+    [DllImport("user32.dll")]
+    public static extern nint GetWindow(nint hWnd, uint uCmd);
+
+    [DllImport("user32.dll")]
+    public static extern uint GetWindowThreadProcessId(nint hWnd, out uint processId);
+
     [DllImport("user32.dll")]
     [return: MarshalAs(UnmanagedType.Bool)]
     public static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, nint lParam);

src/DesktopMagic/MainWindow.xaml

@@ -22,7 +22,7 @@
         MinHeight="600"
         MinWidth="940"
         ExtendsContentIntoTitleBar="True"
-        WindowState="Minimized"
+        WindowState="Normal"
         Loaded="Window_Loaded">
 
     <Grid>

src/DesktopMagic/MainWindow.xaml.cs

@@ -19,6 +19,7 @@ public partial class MainWindow : FluentWindow
 {
     private readonly Manager _manager = Manager.Instance;
     private readonly MainWindowDataContext _mainWindowDataContext = new();
+    private OcclusionMonitor? occlusionMonitor;
 
     [Obsolete]
     public MainWindow()
@@ -39,6 +40,8 @@ public partial class MainWindow : FluentWindow
         {
             App.Logger.LogInfo("Loading application", source: "MainWindow");
 
+            Microsoft.Win32.SystemEvents.DisplaySettingsChanged += SystemEvents_DisplaySettingsChanged;
+
             _mainWindowDataContext.IsLoading = true;
 
             // Load plugins and settings through manager
@@ -47,6 +50,22 @@ public partial class MainWindow : FluentWindow
             _manager.LoadPlugins();
             _manager.LoadLayout();
 
+            // Pause plugin rendering while widgets are fully occluded by other windows.
+            occlusionMonitor = new OcclusionMonitor();
+            occlusionMonitor.Start();
+
+            if (_manager.Settings.IsFirstRun)
+            {
+                _manager.Settings.IsFirstRun = false;
+                _ = Activate();
+            }
+            else
+            {
+                WindowState = WindowState.Minimized;
+                Visibility = Visibility.Collapsed;
+                ShowInTaskbar = false;
+            }
+
             _manager.IsLoaded = true;
             _mainWindowDataContext.IsLoading = false;
             await ShowLatestReleaseInfoAfterUpdateAsync();
@@ -87,6 +106,11 @@ public partial class MainWindow : FluentWindow
 
     private void Window_Closed(object sender, EventArgs e)
     {
+        Microsoft.Win32.SystemEvents.DisplaySettingsChanged -= SystemEvents_DisplaySettingsChanged;
+
+        occlusionMonitor?.Dispose();
+        occlusionMonitor = null;
+
         Visibility = Visibility.Collapsed;
         UpdateLayout();
         _manager.CloseAllPluginWindows();
@@ -101,6 +125,16 @@ public partial class MainWindow : FluentWindow
         }
     }
 
+    private void SystemEvents_DisplaySettingsChanged(object? sender, EventArgs e)
+    {
+        // Re-enumerate screens and reload all widget windows when monitors are added or removed.
+        _ = Application.Current.Dispatcher.BeginInvoke(() =>
+        {
+            _mainWindowDataContext.RefreshScreens();
+            _manager.LoadLayout();
+        });
+    }
+
     internal void RestoreWindow()
     {
         for (int i = 0; i < 10; i++)

src/DesktopMagic/Manager.cs

@@ -5,6 +5,7 @@ using DesktopMagic.Settings;
 
 using System;
 using System.Collections.Generic;
+using System.Drawing;
 using System.IO;
 using System.Linq;
 using System.Text.Json;
@@ -35,6 +36,9 @@ public sealed class Manager
         }
     }
 
+    // Name of the built-in layout that shows no widgets on a screen.
+    public const string EmptyLayoutName = "Empty";
+
     // Plugin management
     private readonly Dictionary<uint, InternalPluginData> _plugins = [];
     private readonly Dictionary<PluginMetadata, Type> _builtInPlugins = new()
@@ -46,6 +50,10 @@ public sealed class Manager
         {new((string)App.LanguageDictionary["weather"], 5) { Author = "Stone_Red" }, typeof(WeatherPlugin)},
         {new((string)App.LanguageDictionary["nextMeetingCountdown"], 6) { Author = "Stone_Red" }, typeof(NextMeetingCountdownPlugin)},
         {new((string)App.LanguageDictionary["agenda"], 7) { Author = "Stone_Red" }, typeof(AgendaPlugin)},
+#if DEBUG
+        {new((string)App.LanguageDictionary["benchmark"], 8) { Author = "Stone_Red" }, typeof(BenchmarkPlugin)},
+        {new((string)App.LanguageDictionary["skiaBenchmark"], 9) { Author = "Stone_Red" }, typeof(SkiaBenchmarkPlugin)},
+#endif
     };
 
     // Window management
@@ -63,6 +71,13 @@ public sealed class Manager
     public DesktopMagicSettings Settings { get; set; } = new();
     public bool IsLoaded { get; set; } = false;
 
+    // Screen selection (which screen is currently edited in the UI)
+    public string? SelectedScreenDeviceName { get; set; }
+
+    public System.Windows.Forms.Screen SelectedScreen => ScreenUtilities.GetScreenByDeviceName(SelectedScreenDeviceName) ?? ScreenUtilities.GetPrimaryScreen();
+
+    public Layout SelectedLayout => GetLayoutForScreen(SelectedScreen);
+
     private readonly JsonSerializerOptions _jsonSettingsOptions = new()
     {
         Converters = { new ColorJsonConverter() }
@@ -135,20 +150,46 @@ public sealed class Manager
         App.Logger.LogInfo($"Loaded {_plugins.Count} plugins", source: "Manager");
     }
 
-    public void LoadPlugin(uint pluginId, Action<InternalPluginData>? onPluginLoaded = null)
+    /// <summary>
+    /// Loads (or unloads) the given plugin on every screen that currently uses the given layout.
+    /// This keeps screens sharing a layout in sync when plugins are enabled or disabled.
+    /// </summary>
+    public void LoadPlugin(uint pluginId, Layout layout, Action<InternalPluginData>? onPluginLoaded = null)
     {
         if (!_plugins.TryGetValue(pluginId, out InternalPluginData? internalPluginData))
         {
             return;
         }
 
-        if (!Settings.CurrentLayout.Plugins.TryGetValue(pluginId, out PluginSettings? pluginSettings))
+        if (!layout.Plugins.TryGetValue(pluginId, out PluginSettings? pluginSettings))
         {
             pluginSettings = new PluginSettings();
-            Settings.CurrentLayout.Plugins.Add(pluginId, pluginSettings);
+            layout.Plugins.Add(pluginId, pluginSettings);
         }
 
-        IPluginWindow? existingWindow = PluginWindows.FirstOrDefault(w => w.PluginMetadata.Id == internalPluginData.Metadata.Id);
+        pluginSettings.Metadata = internalPluginData.Metadata;
+        pluginSettings.Owner = layout;
+
+        foreach (System.Windows.Forms.Screen screen in ScreenUtilities.GetAllScreens())
+        {
+            if (GetLayoutForScreen(screen) == layout)
+            {
+                EnsurePluginWindow(screen, layout, internalPluginData, pluginSettings, onPluginLoaded);
+            }
+        }
+
+        layout.UpdatePlugins();
+    }
+
+    /// <summary>
+    /// Creates or closes the plugin window for a single screen, based on the plugin settings.
+    /// </summary>
+    private void EnsurePluginWindow(System.Windows.Forms.Screen screen, Layout layout, InternalPluginData internalPluginData, PluginSettings pluginSettings, Action<InternalPluginData>? onPluginLoaded)
+    {
+        string screenDeviceName = screen.DeviceName;
+        Rectangle screenBounds = screen.Bounds;
+
+        IPluginWindow? existingWindow = PluginWindows.FirstOrDefault(w => w.PluginMetadata.Id == internalPluginData.Metadata.Id && w.ScreenDeviceName == screenDeviceName);
 
         if (existingWindow is not null || !pluginSettings.Enabled)
         {
@@ -174,21 +215,21 @@ public sealed class Manager
 
         if (_builtInPlugins.TryGetValue(internalPluginData.Metadata, out Type? pluginType))
         {
-            window = new PluginWindow((Api.Plugin)Activator.CreateInstance(pluginType)!, internalPluginData.Metadata, pluginSettings)
+            window = new PluginWindow((Api.Plugin)Activator.CreateInstance(pluginType)!, internalPluginData.Metadata, pluginSettings, screenBounds, screenDeviceName)
             {
                 Title = internalPluginData.Metadata.Id.ToString()
             };
         }
         else if (internalPluginData.Type == PluginType.Web)
         {
-            window = new WebPluginWindow(internalPluginData.Metadata, pluginSettings, internalPluginData.DirectoryPath)
+            window = new WebPluginWindow(internalPluginData.Metadata, pluginSettings, internalPluginData.DirectoryPath, screenBounds, screenDeviceName)
             {
                 Title = internalPluginData.Metadata.Id.ToString()
             };
         }
         else
         {
-            window = new PluginWindow(internalPluginData.Metadata, pluginSettings, internalPluginData.DirectoryPath)
+            window = new PluginWindow(internalPluginData.Metadata, pluginSettings, internalPluginData.DirectoryPath, screenBounds, screenDeviceName)
             {
                 Title = internalPluginData.Metadata.Id.ToString()
             };
@@ -203,10 +244,21 @@ public sealed class Manager
 
         Action exitHandler = () =>
         {
-            PluginWindows.Remove(window);
-            BlockWindowsClosing = false;
-            window.Close();
-            BlockWindowsClosing = true;
+            // Close the widget on every screen using this layout
+            foreach (System.Windows.Forms.Screen sharedScreen in ScreenUtilities.GetAllScreens())
+            {
+                if (GetLayoutForScreen(sharedScreen) == layout)
+                {
+                    IPluginWindow? sharedWindow = PluginWindows.FirstOrDefault(w => w.PluginMetadata.Id == internalPluginData.Metadata.Id && w.ScreenDeviceName == sharedScreen.DeviceName);
+                    if (sharedWindow is not null)
+                    {
+                        PluginWindows.Remove(sharedWindow);
+                        BlockWindowsClosing = false;
+                        sharedWindow.Close();
+                        BlockWindowsClosing = true;
+                    }
+                }
+            }
             pluginSettings.Enabled = false;
         };
 
@@ -224,7 +276,7 @@ public sealed class Manager
         App.Logger.LogInfo("Reloading plugins", source: "PluginManager");
 
         LoadPlugins();
-        LoadLayout(false);
+        LoadLayout();
     }
 
     public void SetEditMode(bool editMode)
@@ -241,6 +293,32 @@ public sealed class Manager
         SaveSettings();
     }
 
+    private readonly Dictionary<(Layout, uint), SettingSynchronizer> settingSynchronizers = [];
+
+    /// <summary>
+    /// Gets (or creates) the synchronizer that keeps the settings of all windows showing the
+    /// given plugin in the given layout in sync.
+    /// </summary>
+    internal SettingSynchronizer GetSettingSynchronizer(Layout layout, uint pluginId)
+    {
+        (Layout, uint) key = (layout, pluginId);
+        if (!settingSynchronizers.TryGetValue(key, out SettingSynchronizer? synchronizer))
+        {
+            synchronizer = new SettingSynchronizer();
+            settingSynchronizers.Add(key, synchronizer);
+        }
+
+        return synchronizer;
+    }
+
+    /// <summary>
+    /// Drops the synchronizer for the given plugin in the given layout once no windows use it anymore.
+    /// </summary>
+    internal void ReleaseSettingSynchronizer(Layout layout, uint pluginId)
+    {
+        _ = settingSynchronizers.Remove((layout, pluginId));
+    }
+
     #endregion
 
     #region Settings Management
@@ -253,7 +331,9 @@ public sealed class Manager
         {
             Settings = new DesktopMagicSettings();
             Settings.Layouts.Add(new Layout("Default"));
+            Settings.Layouts.Add(new Layout(EmptyLayoutName));
             Settings.Themes.Add(new Theme("Default"));
+            Settings.SchemaVersion = 1;
             return;
         }
 
@@ -270,9 +350,62 @@ public sealed class Manager
             Settings.Themes.Add(new Theme("Default"));
         }
 
+        if (Settings.SchemaVersion < 1)
+        {
+            MigrateToScreenAwareSettings();
+            Settings.SchemaVersion = 1;
+        }
+
+        if (!Settings.Layouts.Any(layout => layout.Name == EmptyLayoutName))
+        {
+            Settings.Layouts.Add(new Layout(EmptyLayoutName));
+        }
+
         SettingsChanged?.Invoke();
     }
 
+    /// <summary>
+    /// Migrates legacy settings to screen-aware layouts:
+    /// records the primary screen aspect ratio on each layout and converts
+    /// absolute pixel positions/sizes to percentages of the primary screen bounds.
+    /// </summary>
+    private void MigrateToScreenAwareSettings()
+    {
+        App.Logger.LogInfo("Migrating settings to screen-aware layouts", source: "Manager");
+
+        System.Windows.Forms.Screen primaryScreen = ScreenUtilities.GetPrimaryScreen();
+        double aspectRatio = ScreenUtilities.GetAspectRatio(primaryScreen);
+        Rectangle bounds = primaryScreen.Bounds;
+
+        foreach (Layout layout in Settings.Layouts)
+        {
+            if (layout.ScreenAspectRatio <= 0)
+            {
+                layout.ScreenAspectRatio = aspectRatio;
+            }
+
+            foreach (PluginSettings plugin in layout.Plugins.Values)
+            {
+                if (plugin.Position.X > 1 || plugin.Position.Y > 1 || plugin.Position.X < 0 || plugin.Position.Y < 0)
+                {
+                    plugin.Position = ScreenUtilities.PositionToPercent(new System.Windows.Point(plugin.Position.X, plugin.Position.Y), bounds);
+                }
+
+                if (plugin.Size.X > 1 || plugin.Size.Y > 1)
+                {
+                    plugin.Size = ScreenUtilities.SizeToPercent(new System.Windows.Point(plugin.Size.X, plugin.Size.Y), bounds);
+                }
+            }
+        }
+
+        if (Settings.ScreenLayouts.Count == 0)
+        {
+            Settings.ScreenLayouts[ScreenUtilities.GetMonitorHardwareId(primaryScreen)] = Settings.CurrentLayoutName ?? "Default";
+        }
+
+        App.Logger.LogInfo("Settings migrated to screen-aware layouts", source: "Manager");
+    }
+
     public void SaveSettings()
     {
         if (!IsLoaded)
@@ -290,9 +423,81 @@ public sealed class Manager
 
     #region Layout Management
 
-    public void LoadLayout(bool minimize = true, Action? onComplete = null)
+    /// <summary>
+    /// Resolves the layout that should be applied to the given screen:
+    /// 1. the layout explicitly bound to this screen's device name,
+    /// 2. the layout with the closest matching aspect ratio,
+    /// 3. the first layout.
+    /// </summary>
+    public Layout GetLayoutForScreen(System.Windows.Forms.Screen screen)
     {
-        App.Logger.LogInfo("Loading layout", source: "Manager");
+        if (Settings.ScreenLayouts.TryGetValue(ScreenUtilities.GetMonitorHardwareId(screen), out string? layoutName))
+        {
+            Layout? bound = Settings.Layouts.FirstOrDefault(layout => layout.Name == layoutName);
+            if (bound is not null)
+            {
+                return bound;
+            }
+        }
+
+        double targetRatio = ScreenUtilities.GetAspectRatio(screen);
+        Layout? byAspectRatio = Settings.Layouts
+            .Where(layout => layout.ScreenAspectRatio > 0)
+            .OrderBy(layout => Math.Abs(layout.ScreenAspectRatio - targetRatio))
+            .FirstOrDefault();
+
+        if (byAspectRatio is not null)
+        {
+            return byAspectRatio;
+        }
+
+        return Settings.Layouts.FirstOrDefault() ?? new Layout("ERROR");
+    }
+
+    /// <summary>
+    /// Binds the given layout to the given screen on this machine.
+    /// </summary>
+    public void BindLayoutToScreen(System.Windows.Forms.Screen screen, Layout layout)
+    {
+        Settings.ScreenLayouts[ScreenUtilities.GetMonitorHardwareId(screen)] = layout.Name;
+        SaveSettings();
+    }
+
+    /// <summary>
+    /// Deletes the layout, drops the screen bindings pointing to it and reloads the screens.
+    /// </summary>
+    public void RemoveLayout(Layout layout)
+    {
+        _ = Settings.Layouts.Remove(layout);
+
+        List<string> boundScreens = Settings.ScreenLayouts
+            .Where(kvp => kvp.Value == layout.Name)
+            .Select(kvp => kvp.Key)
+            .ToList();
+
+        foreach (string screenId in boundScreens)
+        {
+            _ = Settings.ScreenLayouts.Remove(screenId);
+        }
+
+        SaveSettings();
+        LoadLayout();
+    }
+
+    /// <summary>
+    /// Gets all plugin windows currently shown on the given screen.
+    /// </summary>
+    public IEnumerable<IPluginWindow> GetWindowsForScreen(string screenDeviceName)
+    {
+        return PluginWindows.Where(window => window.ScreenDeviceName == screenDeviceName).ToList();
+    }
+
+    /// <summary>
+    /// Loads all screens' layouts at once, opening the enabled widgets of every screen.
+    /// </summary>
+    public void LoadLayout(Action? onComplete = null)
+    {
+        App.Logger.LogInfo("Loading layouts", source: "Manager");
         BlockWindowsClosing = false;
 
         foreach (IPluginWindow window in PluginWindows)
@@ -303,7 +508,47 @@ public sealed class Manager
         BlockWindowsClosing = true;
         PluginWindows.Clear();
 
-        bool showWindow = true;
+        foreach (System.Windows.Forms.Screen screen in ScreenUtilities.GetAllScreens())
+        {
+            Layout layout = GetLayoutForScreen(screen);
+            LoadScreen(screen, layout);
+        }
+
+        onComplete?.Invoke();
+        App.Logger.LogInfo("Layouts loaded", source: "Manager");
+    }
+
+    /// <summary>
+    /// Reloads the widgets of a single screen using the layout currently bound to it.
+    /// </summary>
+    public void ReloadScreen(System.Windows.Forms.Screen screen)
+    {
+        App.Logger.LogInfo($"Reloading screen {screen.DeviceName}", source: "Manager");
+
+        List<IPluginWindow> windows = PluginWindows.Where(window => window.ScreenDeviceName == screen.DeviceName).ToList();
+
+        BlockWindowsClosing = false;
+        foreach (IPluginWindow window in windows)
+        {
+            window.Close();
+        }
+
+        BlockWindowsClosing = true;
+        PluginWindows.RemoveAll(window => windows.Contains(window));
+
+        Layout layout = GetLayoutForScreen(screen);
+        LoadScreen(screen, layout);
+    }
+
+    private void LoadScreen(System.Windows.Forms.Screen screen, Layout layout)
+    {
+        App.Logger.LogInfo($"Loading layout \"{layout.Name}\" for screen {screen.DeviceName}", source: "Manager");
+
+        // The empty layout intentionally shows no widgets and is never populated.
+        if (layout.Name == EmptyLayoutName)
+        {
+            return;
+        }
 
         // Load plugins
         foreach (uint pluginId in _plugins.Keys)
@@ -311,42 +556,29 @@ public sealed class Manager
             InternalPluginData internalPluginData = _plugins[pluginId];
 
             // Add plugin to layout if it doesn't exist
-            if (!Settings.CurrentLayout.Plugins.TryGetValue(pluginId, out PluginSettings? pluginSettings))
+            if (!layout.Plugins.TryGetValue(pluginId, out PluginSettings? pluginSettings))
             {
-                Settings.CurrentLayout.Plugins.Add(pluginId, new PluginSettings() { Metadata = internalPluginData.Metadata });
+                layout.Plugins.Add(pluginId, new PluginSettings() { Metadata = internalPluginData.Metadata, Owner = layout });
                 continue;
             }
 
             pluginSettings.Metadata = internalPluginData.Metadata;
+            pluginSettings.Owner = layout;
 
             if (pluginSettings.Enabled)
             {
-                LoadPlugin(pluginId);
-            }
-
-            if (showWindow && pluginSettings.Enabled)
-            {
-                showWindow = false;
+                EnsurePluginWindow(screen, layout, internalPluginData, pluginSettings, null);
             }
         }
 
         // Remove plugins that are not loaded anymore
-        List<uint> pluginIdsToRemove = Settings.CurrentLayout.Plugins.Keys.Where(id => !_plugins.ContainsKey(id)).ToList();
+        List<uint> pluginIdsToRemove = layout.Plugins.Keys.Where(id => !_plugins.ContainsKey(id)).ToList();
         foreach (uint pluginId in pluginIdsToRemove)
         {
-            Settings.CurrentLayout.Plugins.Remove(pluginId);
+            layout.Plugins.Remove(pluginId);
         }
 
-        Settings.CurrentLayout.UpdatePlugins();
-
-        if (minimize && !showWindow)
-        {
-            Application.Current.MainWindow.WindowState = WindowState.Minimized;
-            Application.Current.MainWindow.ShowInTaskbar = false;
-        }
-
-        onComplete?.Invoke();
-        App.Logger.LogInfo("Layout loaded", source: "Manager");
+        layout.UpdatePlugins();
     }
 
     #endregion

src/DesktopMagic/Pages/MainPage.xaml

@@ -2,6 +2,7 @@
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
+      xmlns:busyIndicator="https://github.com/moh3ngolshani/BusyIndicator"
       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
       xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
       xmlns:local="clr-namespace:DesktopMagic.Pages"
@@ -12,76 +13,119 @@
       ScrollViewer.CanContentScroll="False"
       Title="MainPage">
 
-    <Grid Margin="{StaticResource DefaultMargin}">
-        <Grid.RowDefinitions>
-            <RowDefinition Height="auto" />
-            <RowDefinition Height="*" />
-            <RowDefinition Height="auto" />
-        </Grid.RowDefinitions>
+    <busyIndicator:BusyMask IsBusy="{Binding IsSharing}" IndicatorType="ThreeDots" BusyContent="{DynamicResource uploadingToModIo}" BusyContentMargin="0,20,0,0" Foreground="{DynamicResource TextFillColorPrimaryBrush}" Background="{DynamicResource ControlStrokeColorDefaultBrush}">
+        <Grid Margin="{StaticResource DefaultMargin}">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="auto" />
+                <RowDefinition Height="*" />
+                <RowDefinition Height="auto" />
+            </Grid.RowDefinitions>
 
-        <ui:Card Padding="5" Margin="0 0 0 5">
-            <Grid>
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition />
-                    <ColumnDefinition Width="10" />
-                    <ColumnDefinition />
-                </Grid.ColumnDefinitions>
-                <ui:ToggleSwitch x:Name="editCheckBox" Height="30" VerticalAlignment="Center" Margin="5 0 0 0" Content="{DynamicResource editLayout}" Click="EditCheckBox_Click" />
-                <ui:TextBox Grid.Column="2" Text="{Binding PluginsSearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" TextChanged="AllPluginsSearchTextBox_TextChanged" PlaceholderText="{DynamicResource searchInstalledPlugins}" Icon="{ui:SymbolIcon Search24}" IconPlacement="Right" />
-            </Grid>
-        </ui:Card>
+            <ui:Card Padding="5" Margin="0 0 0 5">
+                <Grid>
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition />
+                        <ColumnDefinition Width="10" />
+                        <ColumnDefinition />
+                    </Grid.ColumnDefinitions>
+                    <ui:ToggleSwitch x:Name="editCheckBox" Height="30" VerticalAlignment="Center" Margin="5 0 0 0" Content="{DynamicResource editLayout}" Click="EditCheckBox_Click" />
+                    <ui:TextBox Grid.Column="2" Text="{Binding PluginsSearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" TextChanged="AllPluginsSearchTextBox_TextChanged" PlaceholderText="{DynamicResource searchInstalledPlugins}" Icon="{ui:SymbolIcon Search24}" IconPlacement="Right" />
+                </Grid>
+            </ui:Card>
 
-        <ScrollViewer Background="#FFBBBBBB" PreviewMouseWheel="ScrollViewer_PreviewMouseWheel" Grid.Row="1" VerticalAlignment="Stretch" VerticalContentAlignment="Top">
-            <ItemsControl x:Name="pluginsItemsControl" ItemsSource="{Binding Settings.CurrentLayout.Plugins}">
-                <ItemsControl.ItemTemplate>
-                    <DataTemplate>
-                        <ui:CardExpander Tag="{Binding}" Margin="0 0 0 5" Expanded="OptionsCardExpander_Expanded">
-                            <ui:CardExpander.Header>
-                                <Grid>
-                                    <Grid.RowDefinitions>
-                                        <RowDefinition Height="Auto" />
-                                        <RowDefinition Height="Auto" />
-                                    </Grid.RowDefinitions>
-                                    <Grid.ColumnDefinitions>
-                                        <ColumnDefinition Width="*" />
-                                        <ColumnDefinition Width="Auto" />
-                                    </Grid.ColumnDefinitions>
-                                    <ui:TextBlock Grid.Row="0" Grid.Column="0" FontTypography="Body" Text="{Binding Value.Metadata.Name}" />
-                                    <Label Grid.Row="1" Grid.Column="0" Foreground="{ui:ThemeResource TextFillColorTertiaryBrush}" FontSize="12" ContentStringFormat="{DynamicResource authorFormat}">
-                                        <Label.Style>
-                                            <Style TargetType="Label" BasedOn="{StaticResource {x:Type Label}}">
-                                                <Setter Property="Content" Value="{Binding Value.Metadata.Author, Converter={StaticResource UnderscoreEscapingConverter}}" />
-                                                <Style.Triggers>
-                                                    <DataTrigger Binding="{Binding Value.Metadata.Author}" Value="{x:Null}">
-                                                        <Setter Property="Content" Value="{DynamicResource unknown}" />
-                                                    </DataTrigger>
-                                                </Style.Triggers>
-                                            </Style>
-                                        </Label.Style>
-                                    </Label>
-                                    <ui:ToggleSwitch Grid.Row="0" Grid.RowSpan="2" Grid.Column="1" Click="PluginCheckBox_Click" IsChecked="{Binding Value.Enabled}" Tag="{Binding Key}" Margin="0,0,16,0" VerticalAlignment="Center" />
-                                </Grid>
-                            </ui:CardExpander.Header>
-                        </ui:CardExpander>
-                    </DataTemplate>
-                </ItemsControl.ItemTemplate>
-            </ItemsControl>
-        </ScrollViewer>
+            <ScrollViewer Background="#FFBBBBBB" PreviewMouseWheel="ScrollViewer_PreviewMouseWheel" Grid.Row="1" VerticalAlignment="Stretch" VerticalContentAlignment="Top">
+                <ItemsControl x:Name="pluginsItemsControl" ItemsSource="{Binding SelectedLayout.Plugins}">
+                    <ItemsControl.ItemTemplate>
+                        <DataTemplate>
+                            <ui:CardExpander Tag="{Binding}" Margin="0 0 0 5" Expanded="OptionsCardExpander_Expanded">
+                                <ui:CardExpander.Header>
+                                    <Grid>
+                                        <Grid.RowDefinitions>
+                                            <RowDefinition Height="Auto" />
+                                            <RowDefinition Height="Auto" />
+                                        </Grid.RowDefinitions>
+                                        <Grid.ColumnDefinitions>
+                                            <ColumnDefinition Width="*" />
+                                            <ColumnDefinition Width="Auto" />
+                                        </Grid.ColumnDefinitions>
+                                        <ui:TextBlock Grid.Row="0" Grid.Column="0" FontTypography="Body" Text="{Binding Value.Metadata.Name}" />
+                                        <Label Grid.Row="1" Grid.Column="0" Foreground="{ui:ThemeResource TextFillColorTertiaryBrush}" FontSize="12" ContentStringFormat="{DynamicResource authorFormat}">
+                                            <Label.Style>
+                                                <Style TargetType="Label" BasedOn="{StaticResource {x:Type Label}}">
+                                                    <Setter Property="Content" Value="{Binding Value.Metadata.Author, Converter={StaticResource UnderscoreEscapingConverter}}" />
+                                                    <Style.Triggers>
+                                                        <DataTrigger Binding="{Binding Value.Metadata.Author}" Value="{x:Null}">
+                                                            <Setter Property="Content" Value="{DynamicResource unknown}" />
+                                                        </DataTrigger>
+                                                    </Style.Triggers>
+                                                </Style>
+                                            </Label.Style>
+                                        </Label>
+                                        <ui:ToggleSwitch Grid.Row="0" Grid.RowSpan="2" Grid.Column="1" Click="PluginCheckBox_Click" IsChecked="{Binding Value.Enabled}" Tag="{Binding Key}" Margin="0,0,16,0" VerticalAlignment="Center" />
+                                    </Grid>
+                                </ui:CardExpander.Header>
+                            </ui:CardExpander>
+                        </DataTemplate>
+                    </ItemsControl.ItemTemplate>
+                </ItemsControl>
+            </ScrollViewer>
 
-        <ui:Card Grid.Row="2" Grid.ColumnSpan="2" Margin="0 5 0 0" Padding="5">
-            <Grid  >
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="1*" />
-                    <ColumnDefinition Width="5" />
-                    <ColumnDefinition Width="0.5*" />
-                    <ColumnDefinition Width="5" />
-                    <ColumnDefinition Width="0.5*" />
-                </Grid.ColumnDefinitions>
+            <ui:Card Grid.Row="2" Grid.ColumnSpan="2" Margin="0 5 0 0" Padding="5">
+                <Grid>
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="auto" />
+                        <RowDefinition Height="5" />
+                        <RowDefinition Height="auto" />
+                    </Grid.RowDefinitions>
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="auto" />
+                        <ColumnDefinition Width="5" />
+                        <ColumnDefinition Width="1*" />
+                    </Grid.ColumnDefinitions>
 
-                <ComboBox x:Name="layoutsComboBox" ItemsSource="{Binding Settings.Layouts}" DisplayMemberPath="Name" SelectedValue="{Binding Settings.CurrentLayoutName}" SelectedValuePath="Name" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Padding="4" SelectionChanged="LayoutsComboBox_SelectionChanged" />
-                <ui:Button x:Name="newLayoutButton" Content="{DynamicResource newLayout}" Grid.Column="2" Icon="{ui:SymbolIcon Add24}"  HorizontalAlignment="Stretch" Click="NewLayoutButton_Click" FontWeight="Regular"/>
-                <ui:Button x:Name="removeLayoutButton" Content="{DynamicResource deleteLayout}" Icon="{ui:SymbolIcon Delete24}"  Grid.Column="4" HorizontalAlignment="Stretch" Click="RemoveLayoutButton_Click" FontWeight="Regular"/>
-            </Grid>
-        </ui:Card>
-    </Grid>
+                    <ui:Button x:Name="screenSelectorButton" VerticalAlignment="Stretch" Padding="10,4" Click="ScreenSelectorButton_Click">
+                        <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
+                            <TextBlock x:Name="screenSelectorButtonText" VerticalAlignment="Center" Text="{Binding SelectedScreen.DisplayName}" />
+                            <ui:SymbolIcon Symbol="ChevronDown24" Margin="8,0,0,0" FontSize="12" />
+                        </StackPanel>
+                    </ui:Button>
+
+                    <ComboBox x:Name="layoutsComboBox" Grid.Column="2" ItemsSource="{Binding Settings.Layouts}" DisplayMemberPath="Name" SelectedValue="{Binding SelectedLayoutName}" SelectedValuePath="Name" VerticalAlignment="Center" SelectionChanged="LayoutsComboBox_SelectionChanged" />
+
+                    <Grid Grid.Row="2" Grid.ColumnSpan="3">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="1*" />
+                            <ColumnDefinition Width="5" />
+                            <ColumnDefinition Width="0.5*" />
+                            <ColumnDefinition Width="5" />
+                            <ColumnDefinition Width="0.5*" />
+                        </Grid.ColumnDefinitions>
+
+                        <ui:Button x:Name="shareLayoutButton" Icon="{ui:SymbolIcon Share24}" Grid.Column="0" HorizontalAlignment="Stretch" Click="ShareLayoutButton_Click" FontWeight="Regular">
+                            <TextBlock>
+                                <TextBlock.Style>
+                                    <Style TargetType="TextBlock">
+                                        <Setter Property="Text" Value="{DynamicResource shareOnModIo}" />
+                                        <Style.Triggers>
+                                            <DataTrigger Binding="{Binding SelectedLayout.ShareState}" Value="Modified">
+                                                <Setter Property="Text" Value="{DynamicResource updateOnModIo}" />
+                                            </DataTrigger>
+                                            <DataTrigger Binding="{Binding SelectedLayout.ShareState}" Value="UpToDate">
+                                                <Setter Property="Text" Value="{DynamicResource sharedOnModIo}" />
+                                            </DataTrigger>
+                                            <DataTrigger Binding="{Binding SelectedLayout.ShareState}" Value="NotOwner">
+                                                <Setter Property="Text" Value="{DynamicResource shareCopyOnModIo}" />
+                                            </DataTrigger>
+                                        </Style.Triggers>
+                                    </Style>
+                                </TextBlock.Style>
+                            </TextBlock>
+                        </ui:Button>
+                        <ui:Button x:Name="newLayoutButton" Content="{DynamicResource newLayout}" Icon="{ui:SymbolIcon Add24}" Grid.Column="2" HorizontalAlignment="Stretch" Click="NewLayoutButton_Click" FontWeight="Regular" />
+                        <ui:Button x:Name="removeLayoutButton" Content="{DynamicResource deleteLayout}" Icon="{ui:SymbolIcon Delete24}" Grid.Column="4" HorizontalAlignment="Stretch" Click="RemoveLayoutButton_Click" FontWeight="Regular" />
+                    </Grid>
+                </Grid>
+            </ui:Card>
+        </Grid>
+    </busyIndicator:BusyMask>
 </Page>

src/DesktopMagic/Pages/MainPage.xaml.cs

@@ -20,7 +20,6 @@ public partial class MainPage : Page
 {
     private readonly Manager _manager = Manager.Instance;
     private readonly MainWindowDataContext _dataContext;
-    private bool _isLoadingLayout = false;
 
     public MainPage()
     {
@@ -36,6 +35,7 @@ public partial class MainPage : Page
         // Subscribe to manager events
         _manager.PluginsChanged += OnPluginsChanged;
         _manager.EditModeChanged += OnEditModeChanged;
+        _manager.SettingsChanged += OnSettingsChanged;
 
         Loaded += MainPage_Loaded;
         Unloaded += MainPage_Unloaded;
@@ -45,6 +45,9 @@ public partial class MainPage : Page
     {
         // Initialize edit checkbox state
         editCheckBox.IsChecked = _manager.IsEditMode;
+
+        _dataContext.RefreshScreens();
+        RefreshShareState();
     }
 
     private void MainPage_Unloaded(object sender, RoutedEventArgs e)
@@ -52,6 +55,7 @@ public partial class MainPage : Page
         // Unsubscribe from events
         _manager.PluginsChanged -= OnPluginsChanged;
         _manager.EditModeChanged -= OnEditModeChanged;
+        _manager.SettingsChanged -= OnSettingsChanged;
     }
 
     private void OnPluginsChanged()
@@ -60,9 +64,20 @@ public partial class MainPage : Page
         {
             _dataContext.Settings = _manager.Settings;
             ApplyPluginsFilter();
+            RefreshShareState();
         });
     }
 
+    private void OnSettingsChanged()
+    {
+        Dispatcher.Invoke(RefreshShareState);
+    }
+
+    private void RefreshShareState()
+    {
+        ModIoService.RefreshShareState(_manager.SelectedLayout);
+    }
+
     private void OnEditModeChanged(bool editMode)
     {
         Dispatcher.Invoke(() =>
@@ -76,6 +91,16 @@ public partial class MainPage : Page
         _manager.SetEditMode(editCheckBox.IsChecked == true);
     }
 
+    private void ScreenSelectorButton_Click(object sender, RoutedEventArgs e)
+    {
+        ScreenSelectorDialog dialog = new(_dataContext)
+        {
+            Owner = Window.GetWindow(this)
+        };
+
+        _ = dialog.ShowDialog();
+    }
+
     private void PluginCheckBox_Click(object sender, RoutedEventArgs e)
     {
         if (sender is not Control checkBox)
@@ -85,7 +110,7 @@ public partial class MainPage : Page
 
         uint pluginId = uint.Parse(checkBox.Tag.ToString()!);
 
-        _manager.LoadPlugin(pluginId, (internalPluginData) =>
+        _manager.LoadPlugin(pluginId, _manager.SelectedLayout, (internalPluginData) =>
         {
             Dispatcher.Invoke(() =>
             {
@@ -145,32 +170,61 @@ public partial class MainPage : Page
 
     private void LayoutsComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
     {
-        // Prevent recursive calls and only process if fully loaded
-        if (_isLoadingLayout || !_manager.IsLoaded || !IsLoaded)
+        ApplySelectedLayout();
+        RefreshShareState();
+    }
+
+    private async void ShareLayoutButton_Click(object sender, RoutedEventArgs e)
+    {
+        shareLayoutButton.IsEnabled = false;
+
+        try
+        {
+            await ModIoService.ShareAsync(_manager.SelectedLayout, Window.GetWindow(this), isBusy => _dataContext.IsSharing = isBusy);
+        }
+        finally
+        {
+            shareLayoutButton.IsEnabled = true;
+        }
+    }
+
+    /// <summary>
+    /// Binds the currently selected layout to the currently selected screen and reloads it.
+    /// No-op when the layout is already the one bound to the screen (e.g. programmatic resets).
+    /// </summary>
+    private void ApplySelectedLayout()
+    {
+        if (_dataContext.SelectedScreenId is null)
         {
             return;
         }
 
-        // Check if this is actually a user-initiated change
-        // by verifying that the removed and added items are different
-        if (e.RemovedItems.Count > 0 && e.AddedItems.Count > 0)
+        System.Windows.Forms.Screen? screen = ScreenUtilities.GetScreenByDeviceName(_dataContext.SelectedScreenId);
+        if (screen is null)
         {
-            if (e.RemovedItems[0] == e.AddedItems[0])
-            {
-                return;
-            }
+            return;
         }
 
-        try
+        string? layoutName = _dataContext.SelectedLayoutName;
+        if (layoutName is null)
         {
-            _isLoadingLayout = true;
-            _manager.SaveSettings();
-            _manager.LoadLayout(false);
+            return;
         }
-        finally
+
+        Layout? layout = _manager.Settings.Layouts.FirstOrDefault(l => l.Name == layoutName);
+        if (layout is null)
         {
-            _isLoadingLayout = false;
+            return;
         }
+
+        if (_manager.GetLayoutForScreen(screen) == layout)
+        {
+            return;
+        }
+
+        _manager.BindLayoutToScreen(screen, layout);
+        _manager.ReloadScreen(screen);
+        _dataContext.RefreshSelection();
     }
 
     private async void NewLayoutButton_Click(object sender, RoutedEventArgs e)
@@ -194,18 +248,11 @@ public partial class MainPage : Page
                 return;
             }
 
-            try
-            {
-                _isLoadingLayout = true;
-                _manager.Settings.Layouts.Add(new Layout(inputDialog.ResponseText.Trim()));
-                _manager.Settings.CurrentLayoutName = inputDialog.ResponseText.Trim();
-                _manager.SaveSettings();
-                _manager.LoadLayout(false);
-            }
-            finally
-            {
-                _isLoadingLayout = false;
-            }
+            _manager.Settings.Layouts.Add(new Layout(inputDialog.ResponseText.Trim()));
+            _manager.SaveSettings();
+
+            // Select the new layout so the user can apply it to the current screen
+            _dataContext.SelectedLayoutName = inputDialog.ResponseText.Trim();
         }
     }
 
@@ -237,17 +284,29 @@ public partial class MainPage : Page
             return;
         }
 
-        try
+        Layout? layout = _manager.Settings.Layouts.FirstOrDefault(l => l.Name == _dataContext.SelectedLayoutName);
+        if (layout is null)
         {
-            _isLoadingLayout = true;
-            _ = _manager.Settings.Layouts.Remove(_manager.Settings.CurrentLayout);
-            _manager.SaveSettings();
-            _manager.LoadLayout(false);
+            return;
         }
-        finally
+
+        if (layout.Name == Manager.EmptyLayoutName)
         {
-            _isLoadingLayout = false;
+            Wpf.Ui.Controls.MessageBox cannotDeleteMessageBox = new Wpf.Ui.Controls.MessageBox
+            {
+                Title = App.AppName,
+                Content = (string)FindResource("cannotDeleteEmptyLayout"),
+                CloseButtonText = "Ok"
+            };
+            _ = await cannotDeleteMessageBox.ShowDialogAsync();
+            return;
         }
+
+        // A subscribed layout would be downloaded again on the next sync.
+        await ModIoService.UnsubscribeAsync(layout);
+
+        _manager.RemoveLayout(layout);
+        _dataContext.RefreshSelection();
     }
 
     #endregion

src/DesktopMagic/Pages/ThemePage.xaml

@@ -2,6 +2,7 @@
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
+      xmlns:busyIndicator="https://github.com/moh3ngolshani/BusyIndicator"
       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
       xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
       xmlns:local="clr-namespace:DesktopMagic.Pages"
@@ -9,44 +10,66 @@
       d:DesignHeight="450" d:DesignWidth="800"
       Title="ThemePage">
 
-    <Grid Margin="{StaticResource DefaultMargin}">
-        <Grid.RowDefinitions>
-            <RowDefinition Height="*" />
-            <RowDefinition Height="auto" />
-        </Grid.RowDefinitions>
+    <busyIndicator:BusyMask IsBusy="{Binding IsSharing}" IndicatorType="ThreeDots" BusyContent="{DynamicResource uploadingToModIo}" BusyContentMargin="0,20,0,0" Foreground="{DynamicResource TextFillColorPrimaryBrush}" Background="{DynamicResource ControlStrokeColorDefaultBrush}">
+        <Grid Margin="{StaticResource DefaultMargin}">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="*" />
+                <RowDefinition Height="auto" />
+            </Grid.RowDefinitions>
         
-        <ui:ListView x:Name="themesListBox" Grid.Row="0" Grid.ColumnSpan="1" ItemsSource="{Binding Settings.Themes}" SelectedValue="{Binding Settings.CurrentLayout.CurrentThemeName}" SelectedValuePath="Name" SelectedIndex="2" SelectionMode="Single">
-            <ui:ListView.ItemTemplate>
-                <DataTemplate>
-                    <Grid>
-                        <Grid.ColumnDefinitions>
-                            <ColumnDefinition Width="*" />
-                            <ColumnDefinition Width="Auto" />
-                        </Grid.ColumnDefinitions>
-                        <TextBlock Margin="8" VerticalAlignment="Center" FontWeight="SemiBold" Text="{Binding Name, Mode=OneWay}" />
-                        <StackPanel Grid.Column="1" VerticalAlignment="Center" Orientation="Horizontal" Margin="{StaticResource DefaultMargin}">
-                            <ui:Button x:Name="editThemeButton" Content="{DynamicResource editTheme}" Icon="{ui:SymbolIcon Color24}" HorizontalAlignment="Stretch" Click="EditThemeButton_Click" FontWeight="Regular" Tag="{Binding}">
+            <ui:ListView x:Name="themesListBox" Grid.Row="0" Grid.ColumnSpan="1" ItemsSource="{Binding Settings.Themes}" SelectedValue="{Binding SelectedLayout.CurrentThemeName}" SelectedValuePath="Name" SelectedIndex="2" SelectionMode="Single">
+                <ui:ListView.ItemTemplate>
+                    <DataTemplate>
+                        <Grid>
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="Auto" />
+                            </Grid.ColumnDefinitions>
+                            <TextBlock Margin="8" VerticalAlignment="Center" FontWeight="SemiBold" Text="{Binding Name, Mode=OneWay}" />
+                            <StackPanel Grid.Column="1" VerticalAlignment="Center" Orientation="Horizontal" Margin="{StaticResource DefaultMargin}">
+                                <ui:Button x:Name="shareThemeButton" Icon="{ui:SymbolIcon Share24}" Margin="0 0 5 0" Click="ShareThemeButton_Click" FontWeight="Regular" Tag="{Binding}">
+                                    <TextBlock>
+                                        <TextBlock.Style>
+                                            <Style TargetType="TextBlock">
+                                                <Setter Property="Text" Value="{DynamicResource shareOnModIo}" />
+                                                <Style.Triggers>
+                                                    <DataTrigger Binding="{Binding ShareState}" Value="Modified">
+                                                        <Setter Property="Text" Value="{DynamicResource updateOnModIo}" />
+                                                    </DataTrigger>
+                                                    <DataTrigger Binding="{Binding ShareState}" Value="UpToDate">
+                                                        <Setter Property="Text" Value="{DynamicResource sharedOnModIo}" />
+                                                    </DataTrigger>
+                                                    <DataTrigger Binding="{Binding ShareState}" Value="NotOwner">
+                                                        <Setter Property="Text" Value="{DynamicResource shareCopyOnModIo}" />
+                                                    </DataTrigger>
+                                                </Style.Triggers>
+                                            </Style>
+                                        </TextBlock.Style>
+                                    </TextBlock>
+                                </ui:Button>
+                                <ui:Button x:Name="editThemeButton" Content="{DynamicResource editTheme}" Icon="{ui:SymbolIcon Color24}" HorizontalAlignment="Stretch" Click="EditThemeButton_Click" FontWeight="Regular" Tag="{Binding}">
 
-                            </ui:Button>
-                        </StackPanel>
-                    </Grid>
-                </DataTemplate>
-            </ui:ListView.ItemTemplate>
-        </ui:ListView>
+                                </ui:Button>
+                            </StackPanel>
+                        </Grid>
+                    </DataTemplate>
+                </ui:ListView.ItemTemplate>
+            </ui:ListView>
         
-        <ui:Card Grid.Row="1" Grid.ColumnSpan="2" Margin="0 5 0 0" Padding="5">
-            <Grid  >
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="1*" />
-                    <ColumnDefinition Width="5" />
-                    <ColumnDefinition Width="0.5*" />
-                    <ColumnDefinition Width="5" />
-                    <ColumnDefinition Width="0.5*" />
-                </Grid.ColumnDefinitions>
+            <ui:Card Grid.Row="1" Grid.ColumnSpan="2" Margin="0 5 0 0" Padding="5">
+                <Grid  >
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="1*" />
+                        <ColumnDefinition Width="5" />
+                        <ColumnDefinition Width="0.5*" />
+                        <ColumnDefinition Width="5" />
+                        <ColumnDefinition Width="0.5*" />
+                    </Grid.ColumnDefinitions>
 
-                <ui:Button x:Name="newThemeButton" Content="{DynamicResource newTheme}" Icon="{ui:SymbolIcon Add24}" Grid.Column="2" HorizontalAlignment="Stretch" Click="AddThemeButton_Click" FontWeight="Regular"/>
-                <ui:Button x:Name="deleteThemeButton" Content="{DynamicResource deleteTheme}" Icon="{ui:SymbolIcon Delete24}"  Grid.Column="4"  HorizontalAlignment="Stretch" Click="DeleteThemeButton_Click" FontWeight="Regular"/>
-            </Grid>
-        </ui:Card>
-    </Grid>
+                    <ui:Button x:Name="newThemeButton" Content="{DynamicResource newTheme}" Icon="{ui:SymbolIcon Add24}" Grid.Column="2" HorizontalAlignment="Stretch" Click="AddThemeButton_Click" FontWeight="Regular"/>
+                    <ui:Button x:Name="deleteThemeButton" Content="{DynamicResource deleteTheme}" Icon="{ui:SymbolIcon Delete24}"  Grid.Column="4"  HorizontalAlignment="Stretch" Click="DeleteThemeButton_Click" FontWeight="Regular"/>
+                </Grid>
+            </ui:Card>
+        </Grid>
+    </busyIndicator:BusyMask>
 </Page>

src/DesktopMagic/Pages/ThemePage.xaml.cs

@@ -1,5 +1,6 @@
 using DesktopMagic.DataContexts;
 using DesktopMagic.Dialogs;
+using DesktopMagic.Helpers;
 using DesktopMagic.Plugins;
 
 using System.Linq;
@@ -30,9 +31,15 @@ public partial class ThemePage : Page
         // Subscribe to manager events
         _manager.SettingsChanged += OnSettingsChanged;
 
+        Loaded += ThemePage_Loaded;
         Unloaded += ThemePage_Unloaded;
     }
 
+    private void ThemePage_Loaded(object sender, RoutedEventArgs e)
+    {
+        RefreshShareStates();
+    }
+
     private void ThemePage_Unloaded(object sender, RoutedEventArgs e)
     {
         // Unsubscribe from events
@@ -44,9 +51,37 @@ public partial class ThemePage : Page
         Dispatcher.Invoke(() =>
         {
             _dataContext.Settings = _manager.Settings;
+            RefreshShareStates();
         });
     }
 
+    private void RefreshShareStates()
+    {
+        foreach (Theme theme in _manager.Settings.Themes)
+        {
+            ModIoService.RefreshShareState(theme);
+        }
+    }
+
+    private async void ShareThemeButton_Click(object sender, RoutedEventArgs e)
+    {
+        if (sender is not System.Windows.Controls.Button button || button.Tag is not Theme theme)
+        {
+            return;
+        }
+
+        button.IsEnabled = false;
+
+        try
+        {
+            await ModIoService.ShareAsync(theme, Window.GetWindow(this), isBusy => _dataContext.IsSharing = isBusy);
+        }
+        finally
+        {
+            button.IsEnabled = true;
+        }
+    }
+
     private async void AddThemeButton_Click(object sender, RoutedEventArgs e)
     {
         InputDialog inputDialog = new((string)FindResource("enterThemeName"))
@@ -69,7 +104,7 @@ public partial class ThemePage : Page
             }
 
             _manager.Settings.Themes.Add(new Theme(inputDialog.ResponseText.Trim()));
-            _manager.Settings.CurrentLayout.CurrentThemeName = inputDialog.ResponseText.Trim();
+            _manager.SelectedLayout.CurrentThemeName = inputDialog.ResponseText.Trim();
             _manager.SaveSettings();
         }
     }
@@ -104,6 +139,9 @@ public partial class ThemePage : Page
 
         if (themesListBox.SelectedItem is Theme theme)
         {
+            // A subscribed theme would be downloaded again on the next sync.
+            await ModIoService.UnsubscribeAsync(theme);
+
             _ = _manager.Settings.Themes.Remove(theme);
             _manager.SaveSettings();
         }
@@ -122,5 +160,6 @@ public partial class ThemePage : Page
         };
 
         _ = themeDialog.ShowDialog();
+        ModIoService.RefreshShareState(theme);
     }
 }

src/DesktopMagic/Plugins/IPluginWindow.cs

@@ -13,6 +13,7 @@ public interface IPluginWindow
     PluginMetadata PluginMetadata { get; }
     string PluginFolderPath { get; }
     string Title { get; set; }
+    string ScreenDeviceName { get; }
 
     void Exit();
     void SetEditMode(bool enabled);
@@ -20,5 +21,13 @@ public interface IPluginWindow
     void Hide();
     void Close();
 
+    void ApplySettingValue(string id, string value);
+    void ApplyButtonClick(string id);
+
+    /// <summary>
+    /// Pauses or resumes rendering of the plugin window (e.g. when it is fully occluded by other windows).
+    /// </summary>
+    void SetRenderPaused(bool paused);
+
     event System.ComponentModel.CancelEventHandler Closing;
 }

src/DesktopMagic/Plugins/PluginData.cs

@@ -3,6 +3,7 @@
 using DesktopMagic.Api;
 using DesktopMagic.Settings;
 
+using System;
 using System.Drawing;
 
 using Wpf.Ui.Controls;
@@ -12,11 +13,23 @@ namespace DesktopMagic.Plugins;
 internal class PluginData(PluginWindow window, PluginSettings pluginSettings) : IPluginData
 {
     private readonly PluginWindow window = window;
+    private Size windowPixelSize = new(1, 1);
 
     public ITheme Theme => pluginSettings.Theme;
 
     public Size WindowSize => new Size((int)window.ActualWidth, (int)window.ActualHeight);
 
+    public Size WindowPixelSize => windowPixelSize;
+
+    /// <summary>
+    /// Refreshes the cached device-pixel window size. Must be called from the UI thread
+    /// so the value can be read safely by plugins on their render thread.
+    /// </summary>
+    internal void UpdateWindowPixelSize(int width, int height)
+    {
+        windowPixelSize = new Size(Math.Max(1, width), Math.Max(1, height));
+    }
+
     public Point WindowPosition => new Point((int)window.Left, (int)window.Top);
 
     public string PluginName => window.PluginMetadata.Name;

src/DesktopMagic/Plugins/PluginManager.xaml

@@ -31,19 +31,26 @@
             <ui:Card Grid.ColumnSpan="3" Padding="5" Margin="0 0 0 5">
                 <Grid>
                     <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="auto" />
+                        <ColumnDefinition Width="10" />
                         <ColumnDefinition />
                         <ColumnDefinition Width="10" />
                         <ColumnDefinition />
                     </Grid.ColumnDefinitions>
 
-                    <ui:TextBox Grid.Column="0" Text="{Binding AllPluginsSearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" TextChanged="AllPluginsSearchTextBox_TextChanged" PlaceholderText="{DynamicResource searchAllPlugins}" Icon="{ui:SymbolIcon Search24}" IconPlacement="Right" />
-                    <ui:TextBox Grid.Column="2" Text="{Binding InstalledPluginsSearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" TextChanged="InstalledPluginsSearchTextBox_TextChanged" PlaceholderText="{DynamicResource searchInstalledPlugins}" Icon="{ui:SymbolIcon Search24}" IconPlacement="Right" />
+                    <ComboBox x:Name="categoryComboBox" Grid.Column="0" MinWidth="130" VerticalAlignment="Center" SelectedIndex="{Binding CategoryIndex, Mode=TwoWay}" SelectionChanged="CategoryComboBox_SelectionChanged">
+                        <ComboBoxItem Content="{DynamicResource plugins}" />
+                        <ComboBoxItem Content="{DynamicResource layouts}" />
+                        <ComboBoxItem Content="{DynamicResource themes}" />
+                    </ComboBox>
+                    <ui:TextBox Grid.Column="2" Text="{Binding AllPluginsSearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" TextChanged="AllPluginsSearchTextBox_TextChanged" PlaceholderText="{DynamicResource searchModIo}" Icon="{ui:SymbolIcon Search24}" IconPlacement="Right" />
+                    <ui:TextBox Grid.Column="4" Text="{Binding InstalledPluginsSearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" TextChanged="InstalledPluginsSearchTextBox_TextChanged" PlaceholderText="{DynamicResource searchInstalled}" Icon="{ui:SymbolIcon Search24}" IconPlacement="Right" />
                 </Grid>
             </ui:Card>
 
             <busyIndicator:BusyMask Grid.Row="2" IsBusy="{Binding IsSearching}" IndicatorType="ThreeDots" BusyContent="Searching..." BusyContentMargin="0,50,0,0" Foreground="{DynamicResource TextFillColorPrimaryBrush}" Background="{DynamicResource ControlStrokeColorDefaultBrush}">
                 <ScrollViewer VerticalScrollBarVisibility="Auto" VerticalAlignment="Stretch" Padding="0" VerticalContentAlignment="Top" Margin="0 0 2.5 0">
-                    <ItemsControl ItemsSource="{Binding AllPlugins}">
+                    <ItemsControl ItemsSource="{Binding ShownAll}">
                         <ItemsControl.ItemTemplate>
                             <DataTemplate>
                                 <local:ModEntry Margin="0 0 0 5" />
@@ -56,7 +63,7 @@
                                         <Setter Property="Template">
                                             <Setter.Value>
                                                 <ControlTemplate>
-                                                    <TextBlock Text="No plugins found!" FontSize="20" VerticalAlignment="Center" HorizontalAlignment="Center" />
+                                                    <TextBlock Text="{DynamicResource nothingFound}" FontSize="20" VerticalAlignment="Center" HorizontalAlignment="Center" />
                                                 </ControlTemplate>
                                             </Setter.Value>
                                         </Setter>
@@ -69,7 +76,7 @@
             </busyIndicator:BusyMask>
 
             <ScrollViewer VerticalScrollBarVisibility="Auto" Grid.Row="2" Grid.Column="2" VerticalAlignment="Stretch" Padding="0" VerticalContentAlignment="Top">
-                <ItemsControl  ItemsSource="{Binding InstalledPlugins}" Margin="2.5 0 0 0">
+                <ItemsControl  ItemsSource="{Binding ShownInstalled}" Margin="2.5 0 0 0">
                     <ItemsControl.ItemTemplate>
                         <DataTemplate>
                             <local:ModEntry Margin="0 0 0 5"/>
@@ -82,7 +89,7 @@
                                     <Setter Property="Template">
                                         <Setter.Value>
                                             <ControlTemplate>
-                                                <TextBlock Text="No plugins found!" FontSize="20" VerticalAlignment="Center" HorizontalAlignment="Center" />
+                                                <TextBlock Text="{DynamicResource nothingFound}" FontSize="20" VerticalAlignment="Center" HorizontalAlignment="Center" />
                                             </ControlTemplate>
                                         </Setter.Value>
                                     </Setter>

src/DesktopMagic/Plugins/PluginManager.xaml.cs

@@ -1,6 +1,7 @@
 using DesktopMagic.DataContexts;
 using DesktopMagic.Dialogs;
 using DesktopMagic.Helpers;
+using DesktopMagic.Settings;
 
 using Modio;
 using Modio.Filters;
@@ -32,40 +33,31 @@ namespace DesktopMagic.Plugins;
 /// </summary>
 public partial class PluginManager : Page
 {
-    private const int ModIoGameId = 5665;
-    private const string ModIoApiKey = "88e6ea774c3a502b06114e7fee0829ac";
+    private const uint ModIoGameId = ModIoService.GameId;
     private readonly HttpClient httpClient = new();
     private readonly PluginManagerDataContext pluginManagerDataContext = new();
     private readonly string pluginsPath = Path.Combine(App.ApplicationDataPath, "Plugins");
     private readonly string pluginDevelopmentPath = Path.Combine(App.ApplicationDataPath, "PluginDevelopment");
     private readonly Manager _manager = Manager.Instance;
 
-    private bool changed = false;
-
     private readonly DispatcherTimer searchTimer = new()
     {
         Interval = TimeSpan.FromMilliseconds(300),
     };
 
+    private bool changed = false;
     private Client modIoClient;
 
+    // mod.io data of the local layouts and themes linked to a mod, by mod ID.
+    private readonly Dictionary<uint, Mod> linkedMods = [];
+
     public PluginManager()
     {
         Resources.MergedDictionaries.Add(App.LanguageDictionary);
 
-        string? modIoAccessToken = MainWindowDataContext.GetSettings().ModIoAccessToken;
-
-        if (modIoAccessToken is null)
-        {
-            modIoClient = new Client(new Credentials(ModIoApiKey));
-            App.Logger.LogInfo("Initialized mod.io client without authentication", source: "PluginManager");
-        }
-        else
-        {
-            modIoClient = new Client(new Credentials(ModIoApiKey, modIoAccessToken));
-            pluginManagerDataContext.IsAuthenticated = true;
-            App.Logger.LogInfo("Initialized mod.io client with authentication", source: "PluginManager");
-        }
+        modIoClient = ModIoService.CreateClient();
+        pluginManagerDataContext.IsAuthenticated = ModIoService.IsAuthenticated;
+        App.Logger.LogInfo($"Initialized mod.io client {(ModIoService.IsAuthenticated ? "with" : "without")} authentication", source: "PluginManager");
 
         InitializeComponent();
 
@@ -73,13 +65,85 @@ public partial class PluginManager : Page
         searchTimer.Tick += async (sender, e) =>
         {
             searchTimer.Stop();
-            await SearchAllPlugins(pluginManagerDataContext.AllPluginsSearchText);
+
+            if (pluginManagerDataContext.Category == ModCategory.Plugins)
+            {
+                await SearchAllPlugins(pluginManagerDataContext.AllPluginsSearchText);
+            }
+            else
+            {
+                await SearchShared(pluginManagerDataContext.AllPluginsSearchText);
+            }
         };
 
         Loaded += PluginManager_Loaded;
         Unloaded += PluginManager_Unloaded;
     }
 
+    public async Task Remove(string pluginPath, uint id)
+    {
+        App.Logger.LogInfo($"Removing plugin with ID {id} from path: {pluginPath}", source: "PluginManager");
+        pluginManagerDataContext.IsLoading = true;
+        changed = true;
+
+        PluginEntryDataContext? pluginEntryDataContext = pluginManagerDataContext.InstalledPlugins.FirstOrDefault(p => p.Id == id);
+
+        if (Directory.Exists(pluginPath))
+        {
+            try
+            {
+                Directory.Delete(pluginPath, true);
+                App.Logger.LogInfo($"Successfully deleted plugin directory: {pluginPath}", source: "PluginManager");
+            }
+            catch (Exception ex)
+            {
+                Wpf.Ui.Controls.MessageBox messageBox = new Wpf.Ui.Controls.MessageBox
+                {
+                    Title = "Plugin Manager",
+                    Content = ex.Message,
+                    CloseButtonText = "Ok"
+                };
+                _ = await messageBox.ShowDialogAsync();
+                App.Logger.LogError(ex.Message, source: "PluginManager");
+            }
+        }
+
+        if (pluginEntryDataContext is not null)
+        {
+            _ = pluginManagerDataContext.InstalledPlugins.Remove(pluginEntryDataContext);
+            App.Logger.LogInfo($"Removed plugin {id} from installed plugins list", source: "PluginManager");
+        }
+
+        if (pluginManagerDataContext.IsAuthenticated)
+        {
+            try
+            {
+                await modIoClient.Games[ModIoGameId].Mods.Unsubscribe(id);
+                App.Logger.LogInfo($"Unsubscribed from plugin {id} on mod.io", source: "PluginManager");
+            }
+            catch (Exception ex)
+            {
+                App.Logger.LogError($"Failed to unsubscribe from plugin {id}: {ex.Message}", source: "PluginManager");
+            }
+        }
+
+        pluginManagerDataContext.IsLoading = false;
+    }
+
+    [GeneratedRegex(@"[^a-zA-Z0-9]")]
+    private static partial Regex IdentifierNameRegex();
+
+    private static string GetPluginSafeName(string pluginName)
+    {
+        string pluginSafeName = pluginName.ToLower().Replace("_", " ");
+
+        TextInfo info = CultureInfo.CurrentCulture.TextInfo;
+        pluginSafeName = info.ToTitleCase(pluginSafeName);
+        pluginSafeName = IdentifierNameRegex().Replace(pluginSafeName, "");
+
+        return pluginSafeName;
+    }
+
     private async void PluginManager_Loaded(object sender, RoutedEventArgs e)
     {
         await InitializePluginManager();
@@ -159,7 +223,7 @@ public partial class PluginManager : Page
             IAsyncEnumerable<Mod> mods = modIoClient.Games[ModIoGameId].Mods.Search(filter).ToEnumerable();
             await foreach (Mod mod in mods)
             {
-                if (pluginIds.Contains(mod.Id))
+                if (pluginIds.Contains(mod.Id) || !ModIoService.IsPluginMod(mod))
                 {
                     continue;
                 }
@@ -174,64 +238,13 @@ public partial class PluginManager : Page
         }
 
         await SyncPlugins();
+        await UpdateLinkedItems();
+        await PopulateShared();
 
         pluginManagerDataContext.IsLoading = false;
         App.Logger.LogInfo("Plugin Manager initialization complete", source: "PluginManager");
     }
 
-    public async Task Remove(string pluginPath, uint id)
-    {
-        App.Logger.LogInfo($"Removing plugin with ID {id} from path: {pluginPath}", source: "PluginManager");
-        pluginManagerDataContext.IsLoading = true;
-        changed = true;
-
-        PluginEntryDataContext? pluginEntryDataContext = pluginManagerDataContext.InstalledPlugins.FirstOrDefault(p => p.Id == id);
-
-        if (Directory.Exists(pluginPath))
-        {
-            try
-            {
-                Directory.Delete(pluginPath, true);
-                App.Logger.LogInfo($"Successfully deleted plugin directory: {pluginPath}", source: "PluginManager");
-            }
-            catch (Exception ex)
-            {
-                Wpf.Ui.Controls.MessageBox messageBox = new Wpf.Ui.Controls.MessageBox
-                {
-                    Title = "Plugin Manager",
-                    Content = ex.Message,
-                    CloseButtonText = "Ok"
-                };
-                _ = await messageBox.ShowDialogAsync();
-                App.Logger.LogError(ex.Message, source: "PluginManager");
-            }
-        }
-
-        if (pluginEntryDataContext is not null)
-        {
-            _ = pluginManagerDataContext.InstalledPlugins.Remove(pluginEntryDataContext);
-            App.Logger.LogInfo($"Removed plugin {id} from installed plugins list", source: "PluginManager");
-        }
-
-        if (pluginManagerDataContext.IsAuthenticated)
-        {
-            try
-            {
-                await modIoClient.Games[ModIoGameId].Mods.Unsubscribe(id);
-                App.Logger.LogInfo($"Unsubscribed from plugin {id} on mod.io", source: "PluginManager");
-            }
-            catch (Exception ex)
-            {
-                App.Logger.LogError($"Failed to unsubscribe from plugin {id}: {ex.Message}", source: "PluginManager");
-            }
-        }
-
-        pluginManagerDataContext.IsLoading = false;
-    }
-
-    [GeneratedRegex(@"[^a-zA-Z0-9]")]
-    private static partial Regex IdentifierNameRegex();
-
     private async Task Install(Mod mod)
     {
         App.Logger.LogInfo($"Installing plugin: {mod.Name} (ID: {mod.Id})", source: "PluginManager");
@@ -343,20 +356,177 @@ public partial class PluginManager : Page
 
     private void InstalledPluginsSearchTextBox_TextChanged(object sender, System.Windows.Controls.TextChangedEventArgs e)
     {
-        if (string.IsNullOrWhiteSpace(pluginManagerDataContext.InstalledPluginsSearchText))
+        FilterInstalled();
+    }
+
+    private void FilterInstalled()
+    {
+        string searchText = pluginManagerDataContext.InstalledPluginsSearchText;
+
+        foreach (PluginEntryDataContext pluginEntryDataContext in pluginManagerDataContext.ShownInstalled)
         {
-            foreach (PluginEntryDataContext pluginEntryDataContext in pluginManagerDataContext.InstalledPlugins)
+            pluginEntryDataContext.IsVisible = string.IsNullOrWhiteSpace(searchText) || pluginEntryDataContext.Name.Contains(searchText, StringComparison.OrdinalIgnoreCase);
+        }
+    }
+
+    private async void CategoryComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        if (!IsLoaded)
+        {
+            return;
+        }
+
+        pluginManagerDataContext.CategoryIndex = categoryComboBox.SelectedIndex;
+        pluginManagerDataContext.IsLoading = true;
+        await PopulateShared();
+        FilterInstalled();
+        pluginManagerDataContext.IsLoading = false;
+    }
+
+    /// <summary>
+    /// Fetches the mods of all linked layouts and themes and applies newer versions.
+    /// Subscribed items are also updated by the subscription sync, this covers items installed while logged out.
+    /// </summary>
+    private async Task UpdateLinkedItems()
+    {
+        linkedMods.Clear();
+
+        foreach (IModIoShareable item in ModIoService.GetSharedItems().Where(item => item.ModIo is not null).ToList())
+        {
+            uint modId = item.ModIo!.ModId;
+
+            try
             {
-                pluginEntryDataContext.IsVisible = true;
+                Mod mod = await modIoClient.Games[ModIoGameId].Mods[modId].Get();
+                linkedMods[modId] = mod;
+
+                if (await ModIoService.UpdateAsync(item, mod, EnsurePluginInstalled))
+                {
+                    changed = true;
+                }
+            }
+            catch (Exception ex)
+            {
+                App.Logger.LogError($"Failed to check \"{item.Name}\" (mod {modId}) for updates: {ex.Message}", source: "PluginManager");
             }
         }
-        else
+    }
+
+    /// <summary>
+    /// Fills the lists of the selected layout or theme category.
+    /// </summary>
+    private async Task PopulateShared()
+    {
+        pluginManagerDataContext.InstalledShared.Clear();
+        pluginManagerDataContext.AllShared.Clear();
+
+        if (pluginManagerDataContext.Category == ModCategory.Plugins)
         {
-            foreach (PluginEntryDataContext pluginEntryDataContext in pluginManagerDataContext.InstalledPlugins)
+            return;
+        }
+
+        IEnumerable<IModIoShareable> items = pluginManagerDataContext.Category == ModCategory.Layouts
+            ? _manager.Settings.Layouts
+            : _manager.Settings.Themes;
+
+        foreach (IModIoShareable item in items.Where(item => item.ModIo is not null).ToList())
+        {
+            uint modId = item.ModIo!.ModId;
+
+            if (!linkedMods.TryGetValue(modId, out Mod? mod))
             {
-                pluginEntryDataContext.IsVisible = pluginEntryDataContext.Name.Contains(pluginManagerDataContext.InstalledPluginsSearchText, StringComparison.OrdinalIgnoreCase);
+                try
+                {
+                    mod = await modIoClient.Games[ModIoGameId].Mods[modId].Get();
+                    linkedMods[modId] = mod;
+                }
+                catch (Exception ex)
+                {
+                    App.Logger.LogError($"Failed to fetch mod {modId} of \"{item.Name}\": {ex.Message}", source: "PluginManager");
+                }
+            }
+
+            // Show the local name, it can differ from the mod name (e.g. "Default (2)").
+            PluginMetadata metadata = mod is null ? new PluginMetadata(item.Name, modId) : new PluginMetadata(mod) { Name = item.Name };
+            pluginManagerDataContext.InstalledShared.Add(new PluginEntryDataContext(metadata, new CommandHandler(async () => await RemoveShared(item)), PluginEntryDataContext.Mode.Uninstall));
+        }
+
+        await SearchShared(pluginManagerDataContext.AllPluginsSearchText);
+    }
+
+    private async Task SearchShared(string searchString)
+    {
+        pluginManagerDataContext.AllShared.Clear();
+
+        if (pluginManagerDataContext.Category == ModCategory.Plugins)
+        {
+            pluginManagerDataContext.IsSearching = false;
+            return;
+        }
+
+        string tag = pluginManagerDataContext.Category == ModCategory.Layouts ? SharePackage.LayoutTag : SharePackage.ThemeTag;
+        Filter filter = ModFilter.Tags.Eq(tag);
+
+        if (!string.IsNullOrWhiteSpace(searchString))
+        {
+            if (!searchString.Contains('*'))
+            {
+                searchString = $"*{searchString.Trim()}*";
+            }
+
+            filter = filter.And(ModFilter.Name.Like(searchString));
+        }
+
+        filter = filter.And(ModFilter.Popular.Desc()).Limit(100);
+
+        try
+        {
+            App.Logger.LogInfo($"Fetching shared {tag} mods from mod.io", source: "PluginManager");
+            IAsyncEnumerable<Mod> mods = modIoClient.Games[ModIoGameId].Mods.Search(filter).ToEnumerable();
+            await foreach (Mod mod in mods)
+            {
+                if (ModIoService.FindLinkedItem(mod.Id) is not null)
+                {
+                    continue;
+                }
+
+                pluginManagerDataContext.AllShared.Add(new PluginEntryDataContext(new(mod), new CommandHandler(async () => await InstallShared(mod)), PluginEntryDataContext.Mode.Install));
             }
         }
+        catch (Exception ex)
+        {
+            App.Logger.LogError($"Failed to fetch shared {tag} mods from mod.io: {ex.Message}", source: "PluginManager");
+        }
+
+        pluginManagerDataContext.IsSearching = false;
+    }
+
+    private async Task InstallShared(Mod mod)
+    {
+        pluginManagerDataContext.IsLoading = true;
+
+        if (await ModIoService.InstallAsync(mod, EnsurePluginInstalled))
+        {
+            linkedMods[mod.Id] = mod;
+            changed = true;
+        }
+
+        await PopulateShared();
+        FilterInstalled();
+        pluginManagerDataContext.IsLoading = false;
+    }
+
+    private async Task RemoveShared(IModIoShareable item)
+    {
+        if (!await ModIoService.RemoveAsync(item))
+        {
+            return;
+        }
+
+        pluginManagerDataContext.IsLoading = true;
+        await PopulateShared();
+        FilterInstalled();
+        pluginManagerDataContext.IsLoading = false;
     }
 
     private async Task SearchAllPlugins(string searchString)
@@ -376,7 +546,7 @@ public partial class PluginManager : Page
             IAsyncEnumerable<Mod> mods = modIoClient.Games[ModIoGameId].Mods.Search(filter).ToEnumerable();
             await foreach (Mod mod in mods)
             {
-                if (pluginManagerDataContext.InstalledPlugins.Any(p => p.Id == mod.Id))
+                if (pluginManagerDataContext.InstalledPlugins.Any(p => p.Id == mod.Id) || !ModIoService.IsPluginMod(mod))
                 {
                     continue;
                 }
@@ -664,52 +834,21 @@ public class {pluginSafeName}Plugin : Plugin
     {
         if (pluginManagerDataContext.IsAuthenticated)
         {
-            App.Logger.LogInfo("Logging out from mod.io", source: "PluginManager");
-            MainWindowDataContext.GetSettings().ModIoAccessToken = null;
+            ModIoService.LogOut();
+            modIoClient = ModIoService.CreateClient();
             pluginManagerDataContext.IsAuthenticated = false;
             return;
         }
 
-        App.Logger.LogInfo("Starting mod.io authentication", source: "PluginManager");
-
         try
         {
-            InputDialog inputDialog = new((string)FindResource("enterModIoEmail"), "Plugin Manager")
+            if (!await ModIoService.LogInAsync(Window.GetWindow(this), "Plugin Manager"))
             {
-                Owner = Window.GetWindow(this),
-            };
-
-            if (inputDialog.ShowDialog() != true)
-            {
-                App.Logger.LogInfo("Authentication cancelled by user", source: "PluginManager");
-                return;
-            }
-
-            App.Logger.LogInfo($"Requesting authentication code for email: {inputDialog.ResponseText}", source: "PluginManager");
-            await modIoClient.Auth.RequestCode(ModIoApiKey, inputDialog.ResponseText);
-
-            inputDialog = new((string)FindResource("enterModIoAccessToken"), "Plugin Manager")
-            {
-                Owner = Window.GetWindow(this),
-            };
-
-            if (inputDialog.ShowDialog() != true)
-            {
-                App.Logger.LogInfo("Authentication cancelled by user", source: "PluginManager");
                 return;
             }
 
             pluginManagerDataContext.IsLoading = true;
-
-            AccessToken accessToken = await modIoClient.Auth.SecurityCode(ModIoApiKey, inputDialog.ResponseText);
-
-            if (accessToken.Value is not null)
-            {
-                modIoClient = new Client(new Credentials(ModIoApiKey, accessToken.Value));
-                App.Logger.LogInfo("Successfully authenticated with mod.io", source: "PluginManager");
-            }
-
-            MainWindowDataContext.GetSettings().ModIoAccessToken = accessToken.Value;
+            modIoClient = ModIoService.CreateClient();
             pluginManagerDataContext.IsAuthenticated = true;
 
             App.Logger.LogInfo("Subscribing to installed plugins on mod.io", source: "PluginManager");
@@ -729,7 +868,9 @@ public class {pluginSafeName}Plugin : Plugin
                 }
             }
 
+            await ModIoService.SubscribeToLinkedItemsAsync();
             await SyncPlugins();
+            await PopulateShared();
         }
         catch (Exception ex)
         {
@@ -757,7 +898,8 @@ public class {pluginSafeName}Plugin : Plugin
 
         try
         {
-            IReadOnlyList<Mod> mods = await modIoClient.User.GetSubscriptions(ModFilter.GameId.Eq(ModIoGameId)).ToList();
+            IReadOnlyList<Mod> subscriptions = await modIoClient.User.GetSubscriptions(ModFilter.GameId.Eq(ModIoGameId)).ToList();
+            List<Mod> mods = subscriptions.Where(ModIoService.IsPluginMod).ToList();
             App.Logger.LogInfo($"Found {mods.Count} subscribed plugins on mod.io", source: "PluginManager");
 
             List<PluginEntryDataContext> pluginsToRemove = [];
@@ -790,6 +932,12 @@ public class {pluginSafeName}Plugin : Plugin
             }
 
             App.Logger.LogInfo("Plugin sync completed", source: "PluginManager");
+
+            // Shared layouts and themes are synced after the plugins, so the plugins they use are installed first.
+            if (await ModIoService.SyncSubscriptionsAsync(subscriptions, EnsurePluginInstalled))
+            {
+                changed = true;
+            }
         }
         catch (Exception ex)
         {
@@ -797,15 +945,17 @@ public class {pluginSafeName}Plugin : Plugin
         }
     }
 
-    private static string GetPluginSafeName(string pluginName)
+    private async Task EnsurePluginInstalled(uint pluginId)
     {
-        string pluginSafeName = pluginName.ToLower().Replace("_", " ");
+        if (pluginManagerDataContext.InstalledPlugins.Any(p => p.Id == pluginId))
+        {
+            return;
+        }
 
-        TextInfo info = CultureInfo.CurrentCulture.TextInfo;
-        pluginSafeName = info.ToTitleCase(pluginSafeName);
-        pluginSafeName = IdentifierNameRegex().Replace(pluginSafeName, "");
-
-        return pluginSafeName;
+        App.Logger.LogInfo($"Installing plugin {pluginId} required by a shared layout", source: "PluginManager");
+        Mod mod = await modIoClient.Games[ModIoGameId].Mods[pluginId].Get();
+        await Install(mod);
+        pluginManagerDataContext.IsLoading = true;
     }
 
     private string GetCsprojPath(string pluginName)

src/DesktopMagic/Plugins/PluginWindow.xaml

@@ -26,7 +26,7 @@
                     <RectangleGeometry x:Name="rectangleGeometry" RadiusX="{Binding ElementName=border, Path=CornerRadius.TopLeft}" RadiusY="{Binding ElementName=border, Path=CornerRadius.TopLeft}" />
                 </Viewbox.Clip>
                 <Border x:Name="imageBorder" BorderBrush="#BAFFEF">
-                    <Image x:Name="image" RenderOptions.EdgeMode="Aliased" Margin="0,0,0,0" VerticalAlignment="Top"  RenderTransformOrigin="0.5,0.5" Stretch="Uniform" MouseDown="Window_MouseDown" MouseMove="Window_MouseMove" MouseWheel="Window_MouseWheel" />
+                    <Image x:Name="image" RenderOptions.EdgeMode="Aliased" Margin="0,0,0,0" VerticalAlignment="Top"  RenderTransformOrigin="0.5,0.5" Stretch="Uniform" Focusable="True" MouseDown="Image_MouseDown" MouseMove="Image_MouseMove" MouseWheel="Image_MouseWheel" KeyDown="Image_KeyDown" KeyUp="Image_KeyUp" />
                 </Border>
             </Viewbox>
         </Grid>

src/DesktopMagic/Plugins/PluginWindow.xaml.cs

@@ -6,8 +6,13 @@ using DesktopMagic.Helpers;
 using DesktopMagic.Plugins;
 using DesktopMagic.Settings;
 
+using SkiaSharp;
+
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.ComponentModel;
 using System.Drawing;
 using System.Drawing.Imaging;
 using System.IO;
@@ -35,8 +40,15 @@ public partial class PluginWindow : Window, IPluginWindow
     private Thread? pluginThread;
     private System.Timers.Timer? updateTimer;
     private Plugin? pluginClassInstance;
+    private PluginData? pluginData;
     private AssemblyLoadContext assemblyLoadContext;
 
+    private readonly Rectangle screenBounds;
+    private readonly string screenDeviceName;
+    private bool isUpdatingPosition = false;
+    private bool _editMode = false;
+    private volatile bool renderPaused = false;
+
     private CancellationTokenSource? pluginCancellationTokenSource;
     private FileSystemWatcher? pluginFileWatcher;
     private System.Timers.Timer? reloadDebounceTimer;
@@ -45,11 +57,37 @@ public partial class PluginWindow : Window, IPluginWindow
     private WriteableBitmap? writeableBitmap;
     private BitmapScalingMode lastBitmapScalingMode = BitmapScalingMode.Unspecified;
 
+    // Last presented frame bytes; used to skip re-uploading identical frames so WPF does not
+    // re-upload the texture or re-composite the window (GPU stays idle for static widgets).
+    private byte[]? lastFramePixels;
+    private int lastFrameWidth;
+    private int lastFrameHeight;
+    private int lastFrameStride;
+
+    // Guards against overlapping render ticks. The timer can re-enter while an async
+    // render awaits the UI thread, which would run the plugin concurrently and present
+    // frames out of order. Only one render may be in flight at a time.
+    private long renderInProgress;
+
+    // Event handlers on long-lived settings objects, tracked so they can be unsubscribed on close.
+    private readonly PropertyChangedEventHandler settingsPropertyChangedHandler;
+    private readonly PropertyChangedEventHandler themePropertyChangedHandler;
+    private Theme? subscribedTheme;
+    private NotifyCollectionChangedEventHandler? themesCollectionChangedHandler;
+    private readonly List<(Setting Setting, Action Handler)> subscribedSettings = [];
+    private readonly List<(Setting Setting, Action Handler)> defaultSettingsSubscriptions = [];
+    private readonly List<(Button Button, Action Handler)> subscribedButtonClicks = [];
+
+    private readonly ConcurrentDictionary<string, Setting> localSettings = [];
+    private SettingSynchronizer? synchronizer;
+    private bool suppressButtonSync = false;
+
     public bool IsRunning { get; private set; } = true;
     public PluginMetadata PluginMetadata { get; private set; }
     public string PluginFolderPath { get; private set; }
+    public string ScreenDeviceName => screenDeviceName;
 
-    public PluginWindow(PluginMetadata pluginMetadata, PluginSettings settings, string pluginFolderPath)
+    public PluginWindow(PluginMetadata pluginMetadata, PluginSettings settings, string pluginFolderPath, Rectangle screenBounds, string screenDeviceName)
     {
         InitializeComponent();
 
@@ -69,33 +107,47 @@ public partial class PluginWindow : Window, IPluginWindow
 
         Owner = w;
 
-        settings.PropertyChanged += (e, s) =>
+        settingsPropertyChangedHandler = (_, s) =>
         {
             if (s.PropertyName == nameof(PluginSettings.CurrentThemeName))
             {
-                settings.Theme.PropertyChanged += (se, ev) =>
-                {
-                    ThemeChanged();
-                };
+                SubscribeToTheme(settings.Theme);
                 ThemeChanged();
             }
+            else if (s.PropertyName == nameof(PluginSettings.Position))
+            {
+                UpdatePosition();
+            }
+            else if (s.PropertyName == nameof(PluginSettings.Size))
+            {
+                UpdateSize();
+            }
         };
+        settings.PropertyChanged += settingsPropertyChangedHandler;
 
-        settings.Theme.PropertyChanged += (se, ev) =>
-        {
-            ThemeChanged();
-        };
+        themePropertyChangedHandler = (_, _) => ThemeChanged();
+        SubscribeToTheme(settings.Theme);
 
         PluginMetadata = pluginMetadata;
         this.settings = settings;
+        this.screenBounds = screenBounds;
+        this.screenDeviceName = screenDeviceName;
 
-        Left = settings.Position.X;
-        Top = settings.Position.Y;
-        Width = settings.Size.X;
-        Height = settings.Size.Y;
+        System.Windows.Point position = ScreenUtilities.PercentToPosition(settings.Position, screenBounds);
+        System.Windows.Point size = ScreenUtilities.PercentSizeToSize(settings.Size, screenBounds);
+        Left = position.X;
+        Top = position.Y;
+        Width = size.X;
+        Height = size.Y;
 
         PluginFolderPath = pluginFolderPath;
 
+        if (settings.Owner is not null)
+        {
+            synchronizer = Manager.Instance.GetSettingSynchronizer(settings.Owner, PluginMetadata.Id);
+            synchronizer.Register(this);
+        }
+
         assemblyLoadContext = CreateAssemblyLoadContext();
 
         // Initialize hot reload watcher if plugin supports unloading and is external
@@ -105,11 +157,27 @@ public partial class PluginWindow : Window, IPluginWindow
         }
     }
 
-    public PluginWindow(Plugin pluginClassInstance, PluginMetadata pluginMetadata, PluginSettings settings) : this(pluginMetadata, settings, string.Empty)
+    public PluginWindow(Plugin pluginClassInstance, PluginMetadata pluginMetadata, PluginSettings settings, Rectangle screenBounds, string screenDeviceName) : this(pluginMetadata, settings, string.Empty, screenBounds, screenDeviceName)
     {
         this.pluginClassInstance = pluginClassInstance;
     }
 
+    private void SubscribeToTheme(Theme theme)
+    {
+        if (ReferenceEquals(subscribedTheme, theme))
+        {
+            return;
+        }
+
+        if (subscribedTheme is not null)
+        {
+            subscribedTheme.PropertyChanged -= themePropertyChangedHandler;
+        }
+
+        subscribedTheme = theme;
+        subscribedTheme.PropertyChanged += themePropertyChangedHandler;
+    }
+
     private AssemblyLoadContext CreateAssemblyLoadContext()
     {
         AssemblyLoadContext context = new(PluginMetadata.Name, isCollectible: true);
@@ -118,11 +186,10 @@ public partial class PluginWindow : Window, IPluginWindow
             string assemblyPath = Path.Combine(PluginFolderPath, assemblyName.Name + ".dll");
             if (File.Exists(assemblyPath))
             {
-                return ctx.LoadFromAssemblyPath(assemblyPath);
-            }
-            else
-            {
-                _ = ctx.LoadFromAssemblyName(assemblyName);
+                byte[] assemblyData = File.ReadAllBytes(assemblyPath);
+                using MemoryStream assemblyStream = new(assemblyData);
+
+                return ctx.LoadFromStream(assemblyStream);
             }
             return null;
         };
@@ -281,6 +348,21 @@ public partial class PluginWindow : Window, IPluginWindow
         }
     }
 
+    public void SetRenderPaused(bool paused)
+    {
+        renderPaused = paused;
+
+        if (paused)
+        {
+            updateTimer?.Stop();
+        }
+        else if (IsRunning && pluginClassInstance is { UpdateInterval: > 0 } && updateTimer is not null)
+        {
+            updateTimer.Interval = pluginClassInstance.UpdateInterval;
+            updateTimer.Start();
+        }
+    }
+
     public void UpdatePluginWindow()
     {
         UpdateTimer_Elapsed(updateTimer, null);
@@ -306,6 +388,8 @@ public partial class PluginWindow : Window, IPluginWindow
 
     public void SetEditMode(bool enabled)
     {
+        _editMode = enabled;
+
         if (enabled)
         {
             Topmost = true;
@@ -337,6 +421,9 @@ public partial class PluginWindow : Window, IPluginWindow
         WindowInteropHelper helper = new(this);
         _ = WindowPos.SetWindowLong(helper.Handle, WindowPos.GWL_EXSTYLE,
         WindowPos.GetWindowLong(helper.Handle, WindowPos.GWL_EXSTYLE) | WindowPos.WS_EX_NOACTIVATE);
+
+        HwndSource.FromHwnd(helper.Handle)?.AddHook((IntPtr hwnd, int msg, IntPtr _, IntPtr lParam, ref bool _) =>
+            ScreenUtilities.ClampToScreenHook(hwnd, msg, lParam, screenBounds));
     }
 
     private void UpdateImageFromBitmap(Bitmap bitmap, BitmapScalingMode scalingMode)
@@ -345,8 +432,28 @@ public partial class PluginWindow : Window, IPluginWindow
 
         try
         {
-            Dispatcher.Invoke(() =>
+            int stride = bitmapData.Stride;
+            int height = bitmapData.Height;
+            int byteCount = stride * height;
+
+            unsafe
             {
+                byte* scan0 = (byte*)bitmapData.Scan0.ToPointer();
+
+                // Skip the present when the frame is byte-identical to the last presented one so WPF
+                // does not re-upload the texture or re-composite the window (GPU stays idle for
+                // static widgets that keep ticking).
+                if (lastFramePixels is { Length: > 0 }
+                    && lastFrameWidth == bitmapData.Width
+                    && lastFrameHeight == height
+                    && lastFrameStride == stride
+                    && lastFramePixels.AsSpan().SequenceEqual(new ReadOnlySpan<byte>(scan0, byteCount)))
+                {
+                    return;
+                }
+
+                Dispatcher.Invoke(() =>
+                {
                 if (lastBitmapScalingMode != scalingMode)
                 {
                     RenderOptions.SetBitmapScalingMode(image, scalingMode);
@@ -355,9 +462,19 @@ public partial class PluginWindow : Window, IPluginWindow
 
                 if (writeableBitmap == null || writeableBitmap.PixelWidth != bitmapData.Width || writeableBitmap.PixelHeight != bitmapData.Height)
                 {
+                    // A frame sized to the window maps 1:1 to the display when the bitmap uses the
+                    // actual monitor DPI, so WPF skips the (expensive) per-frame scaling filter.
+                    // Smaller content-sized frames keep 96 DPI to preserve their on-screen semantics.
+                    DpiScale dpi = VisualTreeHelper.GetDpi(this);
+                    bool fullWindowFrame = pluginData != null
+                        && bitmapData.Width == pluginData.WindowPixelSize.Width
+                        && bitmapData.Height == pluginData.WindowPixelSize.Height;
+                    double dpiX = fullWindowFrame ? dpi.DpiScaleX * 96 : bitmap.HorizontalResolution;
+                    double dpiY = fullWindowFrame ? dpi.DpiScaleY * 96 : bitmap.VerticalResolution;
+
                     writeableBitmap = new WriteableBitmap(
                         bitmapData.Width, bitmapData.Height,
-                        bitmap.HorizontalResolution, bitmap.VerticalResolution,
+                        dpiX, dpiY,
                         PixelFormats.Bgra32, null);
                     image.Source = writeableBitmap;
                 }
@@ -379,7 +496,17 @@ public partial class PluginWindow : Window, IPluginWindow
                 {
                     writeableBitmap.Unlock();
                 }
-            });
+                });
+
+                if (lastFramePixels is null || lastFramePixels.Length != byteCount)
+                {
+                    lastFramePixels = new byte[byteCount];
+                }
+                lastFrameWidth = bitmapData.Width;
+                lastFrameHeight = height;
+                lastFrameStride = stride;
+                new ReadOnlySpan<byte>(scan0, byteCount).CopyTo(lastFramePixels);
+            }
         }
         finally
         {
@@ -481,7 +608,7 @@ public partial class PluginWindow : Window, IPluginWindow
                 dll = Assembly.LoadFrom($"{PluginFolderPath}\\main.dll");
             }
 
-            Type? instanceType = Array.Find(dll.GetTypes(), type => type.GetTypeInfo().BaseType == typeof(Plugin));
+            Type? instanceType = Array.Find(dll.GetTypes(), type => type.IsAssignableTo(typeof(Plugin)));
 
             if (instanceType is null)
             {
@@ -505,7 +632,8 @@ public partial class PluginWindow : Window, IPluginWindow
         if (instance is Plugin plugin)
         {
             pluginClassInstance = plugin;
-            pluginClassInstance.Application = new PluginData(this, settings);
+            pluginData = new PluginData(this, settings);
+            pluginClassInstance.Application = pluginData;
         }
         else
         {
@@ -534,6 +662,8 @@ public partial class PluginWindow : Window, IPluginWindow
         };
         updateTimer.Elapsed += UpdateTimer_Elapsed;
 
+        await Dispatcher.InvokeAsync(RefreshWindowPixelSize);
+
         pluginClassInstance.Start();
         if (pluginClassInstance is AsyncPlugin asyncPluginStart)
         {
@@ -544,7 +674,7 @@ public partial class PluginWindow : Window, IPluginWindow
         UpdatePluginWindow();
         await Dispatcher.InvokeAsync(ThemeChanged);
 
-        if (pluginClassInstance.UpdateInterval > 0)
+        if (pluginClassInstance.UpdateInterval > 0 && !renderPaused)
         {
             updateTimer.Interval = pluginClassInstance.UpdateInterval;
             updateTimer.Start();
@@ -562,14 +692,18 @@ public partial class PluginWindow : Window, IPluginWindow
             SetThemeOverride();
             SetThemeOverrideItems();
 
-            pluginClassInstance.horizontalAlignment.OnValueChanged += SetHorizontalAlignment;
-            pluginClassInstance.verticalAlignment.OnValueChanged += SetVerticalAlignment;
-            pluginClassInstance.windowLayer.OnValueChanged += SetWindowLayer;
-            pluginClassInstance.rotation.OnValueChanged += SetRotation;
-            pluginClassInstance.themeOverride.OnValueChanged += SetThemeOverride;
+            SubscribeToDefaultSetting(pluginClassInstance.horizontalAlignment, SetHorizontalAlignment);
+            SubscribeToDefaultSetting(pluginClassInstance.verticalAlignment, SetVerticalAlignment);
+            SubscribeToDefaultSetting(pluginClassInstance.windowLayer, SetWindowLayer);
+            SubscribeToDefaultSetting(pluginClassInstance.rotation, SetRotation);
+            SubscribeToDefaultSetting(pluginClassInstance.themeOverride, SetThemeOverride);
 
-            DesktopMagicSettings desktopMagicSettings = MainWindowDataContext.GetSettings();
-            desktopMagicSettings.Themes.CollectionChanged += (s, e) => SetThemeOverrideItems();
+            if (themesCollectionChangedHandler is null)
+            {
+                themesCollectionChangedHandler = (_, _) => SetThemeOverrideItems();
+                DesktopMagicSettings desktopMagicSettings = MainWindowDataContext.GetSettings();
+                desktopMagicSettings.Themes.CollectionChanged += themesCollectionChangedHandler;
+            }
         });
 
         void SetVerticalAlignment()
@@ -602,7 +736,14 @@ public partial class PluginWindow : Window, IPluginWindow
 
         void SetWindowLayer()
         {
-            WindowPos.SetWindowLayer(this, pluginClassInstance.windowLayer.Value);
+            if (_editMode)
+            {
+                Topmost = true;
+            }
+            else
+            {
+                WindowPos.SetWindowLayer(this, pluginClassInstance.windowLayer.Value);
+            }
         }
 
         void SetRotation()
@@ -636,6 +777,50 @@ public partial class PluginWindow : Window, IPluginWindow
         }
     }
 
+    private void SubscribeToDefaultSetting(Setting setting, Action handler)
+    {
+        setting.OnValueChanged += handler;
+        defaultSettingsSubscriptions.Add((setting, handler));
+    }
+
+    private void OnPluginSettingValueChanged(Setting setting, string id)
+    {
+        pluginClassInstance?.OnSettingsChanged();
+
+        if (pluginClassInstance?.UpdateInterval is 0 or > 500)
+        {
+            pluginClassInstance.Application.UpdateWindow();
+        }
+
+        synchronizer?.SettingChanged(this, id, setting.GetJsonValue());
+    }
+
+    public void ApplySettingValue(string id, string value)
+    {
+        if (localSettings.TryGetValue(id, out Setting? setting) && setting.GetJsonValue() != value)
+        {
+            setting.SetJsonValue(value);
+        }
+    }
+
+    public void ApplyButtonClick(string id)
+    {
+        if (!localSettings.TryGetValue(id, out Setting? setting) || setting is not Button button)
+        {
+            return;
+        }
+
+        suppressButtonSync = true;
+        try
+        {
+            button.Click();
+        }
+        finally
+        {
+            suppressButtonSync = false;
+        }
+    }
+
     private async Task LoadOptions(object instance)
     {
         App.Logger.LogInfo($"\"{PluginMetadata.Name}\" - Loading plugin options", source: "Plugin");
@@ -653,23 +838,36 @@ public partial class PluginWindow : Window, IPluginWindow
                     {
                         if (attribute is SettingAttribute elementAttribute)
                         {
+                            localSettings[elementAttribute.Id] = element;
+
                             SettingElement settingElement = new SettingElement(element, elementAttribute.Id, elementAttribute.Name, elementAttribute.OrderIndex);
 
                             if (settings.Settings.Exists(e => e.Id == elementAttribute.Id))
                             {
                                 SettingElement settingsSettingElement = settings.Settings.First(e => e.Id == elementAttribute.Id);
-                                settingElement.JsonValue = settingsSettingElement.JsonValue;
+                                string savedValue = settingsSettingElement.JsonValue;
+                                if (!string.IsNullOrEmpty(savedValue) || element is not Label and not Button)
+                                {
+                                    settingElement.JsonValue = savedValue;
+                                }
                             }
 
-                            element.OnValueChanged += () =>
-                            {
-                                pluginClassInstance?.OnSettingsChanged();
+                            Action valueChangedHandler = () => OnPluginSettingValueChanged(element, elementAttribute.Id);
+                            element.OnValueChanged += valueChangedHandler;
+                            subscribedSettings.Add((element, valueChangedHandler));
 
-                                if (pluginClassInstance?.UpdateInterval is 0 or > 500)
+                            if (element is Button button)
+                            {
+                                Action clickHandler = () =>
                                 {
-                                    pluginClassInstance.Application.UpdateWindow();
-                                }
-                            };
+                                    if (!suppressButtonSync)
+                                    {
+                                        synchronizer?.ButtonClicked(this, elementAttribute.Id);
+                                    }
+                                };
+                                button.OnClick += clickHandler;
+                                subscribedButtonClicks.Add((button, clickHandler));
+                            }
 
                             settingElements.Add(settingElement);
                             break;
@@ -830,34 +1028,46 @@ public partial class PluginWindow : Window, IPluginWindow
 
     private async void UpdateTimer_Elapsed(object? sender, ElapsedEventArgs? e)
     {
+        // Capture the fields into locals so an in-flight tick keeps the plugin assembly
+        // alive and stays safe when the window is being closed or the plugin reloaded.
+        Plugin? plugin = pluginClassInstance;
+        System.Timers.Timer? timer = updateTimer;
+
+        if (!IsRunning || plugin is null)
+        {
+            return;
+        }
+
+        // Drop the tick when a render is still in flight instead of running the plugin
+        // concurrently (the timer can re-enter while the async render awaits the UI thread).
+        if (Interlocked.CompareExchange(ref renderInProgress, 1, 0) != 0)
+        {
+            return;
+        }
+
         try
         {
-            if (IsRunning && pluginClassInstance is not null)
+            if (plugin is SkiaPlugin or SkiaAsyncPlugin)
+            {
+                await RenderSkiaFrame();
+            }
+            else
             {
                 Bitmap? result;
 
-                if (pluginClassInstance is AsyncPlugin asyncPlugin)
+                if (plugin is AsyncPlugin asyncPlugin)
                 {
                     CancellationToken token = pluginCancellationTokenSource?.Token ?? CancellationToken.None;
                     result = await asyncPlugin.MainAsync(token);
                 }
                 else
                 {
-                    result = pluginClassInstance.Main();
-                }
-
-                if (pluginClassInstance.UpdateInterval > 0)
-                {
-                    updateTimer!.Interval = pluginClassInstance.UpdateInterval;
-                }
-                else
-                {
-                    updateTimer!.Stop();
+                    result = plugin.Main();
                 }
 
                 if (result is not null)
                 {
-                    BitmapScalingMode renderOptions = pluginClassInstance.RenderQuality switch
+                    BitmapScalingMode renderOptions = plugin.RenderQuality switch
                     {
                         RenderQuality.High => BitmapScalingMode.HighQuality,
                         RenderQuality.Low => BitmapScalingMode.LowQuality,
@@ -868,9 +1078,30 @@ public partial class PluginWindow : Window, IPluginWindow
                     UpdateImageFromBitmap(result, renderOptions);
                 }
             }
+
+            if (timer is null)
+            {
+                return;
+            }
+
+            if (plugin.UpdateInterval > 0)
+            {
+                timer.Interval = plugin.UpdateInterval;
+            }
+            else
+            {
+                timer.Stop();
+            }
         }
         catch (Exception ex)
         {
+            // If the window is closing, the plugin state is being torn down and the
+            // exception is a teardown race - ignore it instead of showing an error.
+            if (!IsRunning)
+            {
+                return;
+            }
+
             IsRunning = false;
             App.Logger.LogError($"\"{PluginMetadata.Name}\" - {ex}", source: "Plugin");
             _ = await Dispatcher.InvokeAsync(async () =>
@@ -884,12 +1115,143 @@ public partial class PluginWindow : Window, IPluginWindow
                 _ = await messageBox.ShowDialogAsync();
             });
             Exit();
+        }
+        finally
+        {
+            Interlocked.Exchange(ref renderInProgress, 0);
+        }
+    }
+
+    private async Task RenderSkiaFrame()
+    {
+        Plugin? plugin = pluginClassInstance;
+
+        if (plugin is null)
+        {
             return;
         }
 
-        if (!IsRunning)
+        SKImage? skImage;
+
+        if (plugin is SkiaAsyncPlugin skiaAsyncPlugin)
         {
-            updateTimer!.Stop();
+            CancellationToken token = pluginCancellationTokenSource?.Token ?? CancellationToken.None;
+            skImage = await skiaAsyncPlugin.MainAsync(token);
+        }
+        else if (plugin is SkiaPlugin skiaPlugin)
+        {
+            skImage = skiaPlugin.Main();
+        }
+        else
+        {
+            return;
+        }
+
+        // Null keeps the previous frame, matching how GDI plugins return null from Main().
+        if (skImage is null)
+        {
+            return;
+        }
+
+        using (skImage)
+        {
+            using SKImage raster = skImage.ToRasterImage();
+            using SKPixmap? pixmap = raster.PeekPixels();
+
+            if (pixmap is null)
+            {
+                return;
+            }
+
+            int width = pixmap.Width;
+            int height = pixmap.Height;
+            int byteCount = pixmap.RowBytes * height;
+
+            // Skip the present when the frame is byte-identical to the last presented one so WPF
+            // does not re-upload the texture or re-composite the window (GPU stays idle for
+            // static widgets that keep ticking).
+            if (lastFramePixels is { Length: > 0 }
+                && lastFrameWidth == width
+                && lastFrameHeight == height
+                && lastFrameStride == pixmap.RowBytes
+                && lastFramePixels.AsSpan().SequenceEqual(pixmap.GetPixelSpan()))
+            {
+                return;
+            }
+
+            BitmapScalingMode scalingMode = plugin.RenderQuality switch
+            {
+                RenderQuality.High => BitmapScalingMode.HighQuality,
+                RenderQuality.Low => BitmapScalingMode.LowQuality,
+                RenderQuality.Performance => BitmapScalingMode.NearestNeighbor,
+                _ => BitmapScalingMode.Unspecified
+            };
+
+            await Dispatcher.InvokeAsync(() =>
+            {
+                if (lastBitmapScalingMode != scalingMode)
+                {
+                    RenderOptions.SetBitmapScalingMode(image, scalingMode);
+                    lastBitmapScalingMode = scalingMode;
+                }
+
+                if (writeableBitmap is null || writeableBitmap.PixelWidth != width || writeableBitmap.PixelHeight != height)
+                {
+                    // A frame sized to the window maps 1:1 to the display when the bitmap uses the
+                    // actual monitor DPI, so WPF skips the (expensive) per-frame scaling filter.
+                    // Smaller content-sized frames keep 96 DPI to preserve their on-screen semantics.
+                    DpiScale dpi = VisualTreeHelper.GetDpi(this);
+                    bool fullWindowFrame = pluginData != null
+                        && width == pluginData.WindowPixelSize.Width
+                        && height == pluginData.WindowPixelSize.Height;
+                    double dpiX = fullWindowFrame ? dpi.DpiScaleX * 96 : 96;
+                    double dpiY = fullWindowFrame ? dpi.DpiScaleY * 96 : 96;
+
+                    // Skia outputs premultiplied alpha, so use Pbgra32 (premultiplied BGRA).
+                    // Bgra32 is straight alpha and would render semi-transparent pixels too dark.
+                    writeableBitmap = new WriteableBitmap(width, height, dpiX, dpiY, PixelFormats.Pbgra32, null);
+                    image.Source = writeableBitmap;
+                }
+
+                writeableBitmap.Lock();
+                try
+                {
+                    int destStride = writeableBitmap.BackBufferStride;
+                    int srcStride = pixmap.RowBytes;
+                    int copyWidth = Math.Min(srcStride, destStride);
+                    int copyRows = Math.Min(pixmap.Height, height);
+
+                    unsafe
+                    {
+                        byte* src = (byte*)pixmap.GetPixels().ToPointer();
+                        byte* dst = (byte*)writeableBitmap.BackBuffer.ToPointer();
+
+                        for (int row = 0; row < copyRows; row++)
+                        {
+                            Buffer.MemoryCopy(
+                                src + (row * srcStride),
+                                dst + (row * destStride),
+                                destStride,
+                                copyWidth);
+                        }
+                    }
+
+                    writeableBitmap.AddDirtyRect(new Int32Rect(0, 0, width, height));
+                }
+                finally
+                {
+                    writeableBitmap.Unlock();
+                }
+            });
+
+            if (lastFramePixels is null || lastFramePixels.Length != byteCount)
+            {
+                lastFramePixels = new byte[byteCount];
+            }
+            lastFrameWidth = width;
+            lastFrameHeight = height;
+            lastFrameStride = pixmap.RowBytes;
+            pixmap.GetPixelSpan().CopyTo(lastFramePixels);
         }
     }
 
@@ -921,30 +1283,156 @@ public partial class PluginWindow : Window, IPluginWindow
         reloadDebounceTimer?.Dispose();
         reloadDebounceTimer = null;
 
+        updateTimer?.Stop();
+        updateTimer?.Dispose();
+        updateTimer = null;
+
         // Stop plugin using the shared method (no need to await in synchronous event handler)
         _ = StopPlugin(unloadAssembly: true);
+
+        UnsubscribeEvents();
+        DetachSettings();
+
+        if (synchronizer is not null && settings.Owner is not null)
+        {
+            if (synchronizer.Unregister(this))
+            {
+                Manager.Instance.ReleaseSettingSynchronizer(settings.Owner, PluginMetadata.Id);
+            }
+            synchronizer = null;
+        }
+    }
+
+    private void DetachSettings()
+    {
+        foreach (SettingElement settingElement in settings.Settings)
+        {
+            string value = settingElement.JsonValue;
+            settingElement.Input = null;
+            settingElement.JsonValue = value;
+        }
+    }
+
+    private void UnsubscribeEvents()
+    {
+        settings.PropertyChanged -= settingsPropertyChangedHandler;
+
+        if (subscribedTheme is not null)
+        {
+            subscribedTheme.PropertyChanged -= themePropertyChangedHandler;
+            subscribedTheme = null;
+        }
+
+        if (themesCollectionChangedHandler is not null)
+        {
+            MainWindowDataContext.GetSettings().Themes.CollectionChanged -= themesCollectionChangedHandler;
+            themesCollectionChangedHandler = null;
+        }
+
+        foreach ((Setting Setting, Action Handler) subscription in subscribedSettings)
+        {
+            subscription.Setting.OnValueChanged -= subscription.Handler;
+        }
+        subscribedSettings.Clear();
+
+        foreach ((Setting Setting, Action Handler) subscription in defaultSettingsSubscriptions)
+        {
+            subscription.Setting.OnValueChanged -= subscription.Handler;
+        }
+        defaultSettingsSubscriptions.Clear();
+
+        foreach ((Button Button, Action Handler) subscription in subscribedButtonClicks)
+        {
+            subscription.Button.OnClick -= subscription.Handler;
+        }
+        subscribedButtonClicks.Clear();
+
+        localSettings.Clear();
+    }
+
+    private void UpdatePosition()
+    {
+        if (isUpdatingPosition)
+        {
+            return;
+        }
+
+        System.Windows.Point position = ScreenUtilities.PercentToPosition(settings.Position, screenBounds);
+        if (position == new System.Windows.Point(Left, Top))
+        {
+            return;
+        }
+
+        isUpdatingPosition = true;
+        Left = position.X;
+        Top = position.Y;
+        isUpdatingPosition = false;
+    }
+
+    private void UpdateSize()
+    {
+        if (isUpdatingPosition)
+        {
+            return;
+        }
+
+        System.Windows.Point size = ScreenUtilities.PercentSizeToSize(settings.Size, screenBounds);
+        if (size == new System.Windows.Point(Width, Height))
+        {
+            return;
+        }
+
+        isUpdatingPosition = true;
+        Width = size.X;
+        Height = size.Y;
+        isUpdatingPosition = false;
     }
 
     #region Window Events
 
     private void Window_LocationChanged(object sender, EventArgs e)
     {
-        settings.Position = new System.Windows.Point(Left, Top);
+        if (isUpdatingPosition)
+        {
+            return;
+        }
+
+        settings.Position = ScreenUtilities.PositionToPercent(new System.Windows.Point(Left, Top), screenBounds);
+        RefreshWindowPixelSize();
     }
 
     private void Window_SizeChanged(object sender, SizeChangedEventArgs e)
     {
-        settings.Size = new System.Windows.Point(Width, Height);
+        if (!isUpdatingPosition)
+        {
+            settings.Size = ScreenUtilities.SizeToPercent(new System.Windows.Point(Width, Height), screenBounds);
+        }
 
         tileBar.CaptionHeight = ActualHeight - 10;
+        RefreshWindowPixelSize();
     }
 
-    private void Window_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
+    private void RefreshWindowPixelSize()
     {
+        DpiScale dpi = VisualTreeHelper.GetDpi(this);
+        pluginData?.UpdateWindowPixelSize((int)Math.Ceiling(ActualWidth * dpi.DpiScaleX), (int)Math.Ceiling(ActualHeight * dpi.DpiScaleY));
+    }
+
+    private void Image_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
+    {
+        _ = image.Focus();
+
         ImageSource imageSource = image.Source;
         BitmapSource bitmapImage = (BitmapSource)imageSource;
-        double pixelMousePositionX = e.GetPosition(image).X * bitmapImage.PixelWidth / image.ActualHeight;
-        double pixelMousePositionY = e.GetPosition(image).Y * bitmapImage.PixelHeight / image.ActualHeight;
+        double actualWidth = image.ActualWidth;
+        double actualHeight = image.ActualHeight;
+        if (actualWidth <= 0 || actualHeight <= 0)
+        {
+            return;
+        }
+
+        double pixelMousePositionX = e.GetPosition(image).X * bitmapImage.PixelWidth / actualWidth;
+        double pixelMousePositionY = e.GetPosition(image).Y * bitmapImage.PixelHeight / actualHeight;
 
         MouseButton mouseButton;
 
@@ -970,27 +1458,75 @@ public partial class PluginWindow : Window, IPluginWindow
         pluginClassInstance?.OnMouseClick(point, mouseButton);
     }
 
-    private void Window_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
+    private void Image_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
     {
         ImageSource imageSource = image.Source;
         BitmapSource bitmapImage = (BitmapSource)imageSource;
-        double pixelMousePositionX = e.GetPosition(image).X * bitmapImage.PixelWidth / image.ActualHeight;
-        double pixelMousePositionY = e.GetPosition(image).Y * bitmapImage.PixelHeight / image.ActualHeight;
+        double actualWidth = image.ActualWidth;
+        double actualHeight = image.ActualHeight;
+        if (actualWidth <= 0 || actualHeight <= 0)
+        {
+            return;
+        }
+
+        double pixelMousePositionX = e.GetPosition(image).X * bitmapImage.PixelWidth / actualWidth;
+        double pixelMousePositionY = e.GetPosition(image).Y * bitmapImage.PixelHeight / actualHeight;
 
         System.Drawing.Point point = new System.Drawing.Point((int)pixelMousePositionX, (int)pixelMousePositionY);
         pluginClassInstance?.OnMouseMove(point);
     }
 
-    private void Window_MouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
+    private void Image_MouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
     {
         ImageSource imageSource = image.Source;
         BitmapSource bitmapImage = (BitmapSource)imageSource;
-        double pixelMousePositionX = e.GetPosition(image).X * bitmapImage.PixelWidth / image.ActualHeight;
-        double pixelMousePositionY = e.GetPosition(image).Y * bitmapImage.PixelHeight / image.ActualHeight;
+        double actualWidth = image.ActualWidth;
+        double actualHeight = image.ActualHeight;
+        if (actualWidth <= 0 || actualHeight <= 0)
+        {
+            return;
+        }
+
+        double pixelMousePositionX = e.GetPosition(image).X * bitmapImage.PixelWidth / actualWidth;
+        double pixelMousePositionY = e.GetPosition(image).Y * bitmapImage.PixelHeight / actualHeight;
 
         System.Drawing.Point point = new System.Drawing.Point((int)pixelMousePositionX, (int)pixelMousePositionY);
         pluginClassInstance?.OnMouseWheel(point, e.Delta);
     }
 
+    private void Image_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
+    {
+        if (pluginClassInstance is null)
+        {
+            return;
+        }
+
+        Keys key = (Keys)e.Key;
+        System.Windows.Input.ModifierKeys modifiers = e.KeyboardDevice.Modifiers;
+        bool alt = modifiers.HasFlag(System.Windows.Input.ModifierKeys.Alt);
+        bool control = modifiers.HasFlag(System.Windows.Input.ModifierKeys.Control);
+        bool shift = modifiers.HasFlag(System.Windows.Input.ModifierKeys.Shift);
+        bool windows = modifiers.HasFlag(System.Windows.Input.ModifierKeys.Windows);
+
+        pluginClassInstance.OnKeyDown(new KeyEventArgs(key, alt, control, shift, windows));
+    }
+
+    private void Image_KeyUp(object sender, System.Windows.Input.KeyEventArgs e)
+    {
+        if (pluginClassInstance is null)
+        {
+            return;
+        }
+
+        Keys key = (Keys)e.Key;
+        System.Windows.Input.ModifierKeys modifiers = e.KeyboardDevice.Modifiers;
+        bool alt = modifiers.HasFlag(System.Windows.Input.ModifierKeys.Alt);
+        bool control = modifiers.HasFlag(System.Windows.Input.ModifierKeys.Control);
+        bool shift = modifiers.HasFlag(System.Windows.Input.ModifierKeys.Shift);
+        bool windows = modifiers.HasFlag(System.Windows.Input.ModifierKeys.Windows);
+
+        pluginClassInstance.OnKeyUp(new KeyEventArgs(key, alt, control, shift, windows));
+    }
+
     #endregion Window Events
 }

src/DesktopMagic/Plugins/SettingElement.cs

@@ -7,15 +7,27 @@ namespace DesktopMagic.Plugins;
 public class SettingElement
 {
     private string jsonValue = string.Empty;
+    private bool shareable;
 
     [JsonIgnore]
-    public Setting Input { get; set; }
+    public Setting? Input { get; set; }
 
     public string Name { get; set; }
     public int OrderIndex { get; set; }
 
     public string Id { get; set; }
 
+    /// <summary>
+    /// Whether the value may be included when sharing a layout on mod.io.
+    /// Free-text values (URLs, locations, file paths, ...) can contain personal data and are never shared.
+    /// Persisted so the decision stays stable while the plugin is not loaded.
+    /// </summary>
+    public bool Shareable
+    {
+        get => Input is null ? shareable : IsShareableInput(Input);
+        set => shareable = value;
+    }
+
     public string JsonValue
     {
         get => Input?.GetJsonValue() ?? jsonValue;
@@ -40,6 +52,11 @@ public class SettingElement
         OrderIndex = orderIndex;
     }
 
+    private static bool IsShareableInput(Setting input)
+    {
+        return input is CheckBox or ColorPicker or ComboBox or IntegerUpDown or Slider;
+    }
+
 #pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
 
     [JsonConstructor]

src/DesktopMagic/Plugins/SettingSynchronizer.cs

@@ -0,0 +1,110 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Threading;
+
+namespace DesktopMagic.Plugins;
+
+/// <summary>
+/// Keeps the per-instance plugin settings of every window sharing the same layout in sync.
+/// Each window owns its own <see cref="DesktopMagic.Api.Settings.Setting"/> objects (plugins
+/// hold them in readonly fields and subscribe to them in Start), so a value change on one
+/// window has to be mirrored onto the sibling windows.
+/// </summary>
+internal sealed class SettingSynchronizer
+{
+    private readonly object _lock = new();
+    private readonly List<IPluginWindow> windows = [];
+    private readonly HashSet<(IPluginWindow Window, string Id)> inFlight = [];
+
+    /// <summary>
+    /// Registers a window so it receives mirrored settings from the other windows of this layout.
+    /// </summary>
+    public void Register(IPluginWindow window)
+    {
+        lock (_lock)
+        {
+            if (!windows.Contains(window))
+            {
+                windows.Add(window);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Unregisters a window and returns whether no windows remain.
+    /// </summary>
+    public bool Unregister(IPluginWindow window)
+    {
+        lock (_lock)
+        {
+            windows.Remove(window);
+            return windows.Count == 0;
+        }
+    }
+
+    /// <summary>
+    /// Mirrors a setting value change onto every other registered window.
+    /// </summary>
+    public void SettingChanged(IPluginWindow origin, string id, string value)
+    {
+        Mirror(origin, id, window => window.ApplySettingValue(id, value));
+    }
+
+    /// <summary>
+    /// Mirrors a button click onto every other registered window.
+    /// </summary>
+    public void ButtonClicked(IPluginWindow origin, string id)
+    {
+        Mirror(origin, id, window => window.ApplyButtonClick(id));
+    }
+
+    private void Mirror(IPluginWindow origin, string id, Action<IPluginWindow> apply)
+    {
+        IPluginWindow[] snapshot;
+        lock (_lock)
+        {
+            snapshot = windows.ToArray();
+        }
+
+        foreach (IPluginWindow window in snapshot)
+        {
+            if (ReferenceEquals(window, origin) || !window.IsRunning)
+            {
+                continue;
+            }
+
+            lock (_lock)
+            {
+                if (!inFlight.Add((window, id)))
+                {
+                    continue;
+                }
+            }
+
+            if (window is not DispatcherObject dispatcherObject)
+            {
+                lock (_lock)
+                {
+                    inFlight.Remove((window, id));
+                }
+                continue;
+            }
+
+            _ = dispatcherObject.Dispatcher.InvokeAsync(() =>
+            {
+                try
+                {
+                    apply(window);
+                }
+                finally
+                {
+                    lock (_lock)
+                    {
+                        inFlight.Remove((window, id));
+                    }
+                }
+            });
+        }
+    }
+}

src/DesktopMagic/Plugins/Theme.cs

@@ -1,5 +1,6 @@
 using DesktopMagic.Api;
 using DesktopMagic.Helpers;
+using DesktopMagic.Settings;
 
 using System.ComponentModel;
 using System.Runtime.CompilerServices;
@@ -11,7 +12,7 @@ using Color = System.Drawing.Color;
 
 namespace DesktopMagic.Plugins;
 
-public class Theme(string name) : ITheme, INotifyPropertyChanged
+public class Theme(string name) : ITheme, INotifyPropertyChanged, IModIoShareable
 {
     public event PropertyChangedEventHandler? PropertyChanged;
 
@@ -21,6 +22,23 @@ public class Theme(string name) : ITheme, INotifyPropertyChanged
     private string font = "Segoe UI";
     private int cornerRadius;
     private int margin;
+    private ModIoShareState shareState;
+
+    public ModIoLink? ModIo { get; set; }
+
+    [JsonIgnore]
+    public ModIoShareState ShareState
+    {
+        get => shareState;
+        set
+        {
+            if (shareState != value)
+            {
+                shareState = value;
+                OnPropertyChanged();
+            }
+        }
+    }
 
     public string Name
     {

src/DesktopMagic/Plugins/WebPluginWindow.xaml.cs

@@ -6,7 +6,9 @@ using DesktopMagic.Settings;
 using Microsoft.Web.WebView2.Core;
 
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.IO;
 using System.Linq;
 using System.Text.Json;
@@ -29,11 +31,27 @@ public partial class WebPluginWindow : Window, IPluginWindow
     private System.Timers.Timer? reloadDebounceTimer;
     private bool isReloading = false;
 
+    private readonly System.Drawing.Rectangle screenBounds;
+    private readonly string screenDeviceName;
+    private bool isUpdatingPosition = false;
+
+    // Event handlers on long-lived settings objects, tracked so they can be unsubscribed on close.
+    private readonly PropertyChangedEventHandler settingsPropertyChangedHandler;
+    private readonly PropertyChangedEventHandler themePropertyChangedHandler;
+    private Theme? subscribedTheme;
+    private readonly List<(Setting Setting, Action Handler)> subscribedSettings = [];
+    private readonly List<(Button Button, Action Handler)> subscribedButtonClicks = [];
+
+    private readonly ConcurrentDictionary<string, Setting> localSettings = [];
+    private SettingSynchronizer? synchronizer;
+    private bool suppressButtonSync = false;
+
     public bool IsRunning { get; private set; } = true;
     public PluginMetadata PluginMetadata { get; private set; }
     public string PluginFolderPath { get; private set; }
+    public string ScreenDeviceName => screenDeviceName;
 
-    public WebPluginWindow(PluginMetadata pluginMetadata, PluginSettings settings, string pluginFolderPath)
+    public WebPluginWindow(PluginMetadata pluginMetadata, PluginSettings settings, string pluginFolderPath, System.Drawing.Rectangle screenBounds, string screenDeviceName)
     {
         InitializeComponent();
 
@@ -53,39 +71,69 @@ public partial class WebPluginWindow : Window, IPluginWindow
 
         Owner = w;
 
-        settings.PropertyChanged += (e, s) =>
+        settingsPropertyChangedHandler = (_, s) =>
         {
             if (s.PropertyName == nameof(PluginSettings.CurrentThemeName))
             {
-                settings.Theme.PropertyChanged += (se, ev) =>
-                {
-                    ThemeChanged();
-                };
+                SubscribeToTheme(settings.Theme);
                 ThemeChanged();
             }
+            else if (s.PropertyName == nameof(PluginSettings.Position))
+            {
+                UpdatePosition();
+            }
+            else if (s.PropertyName == nameof(PluginSettings.Size))
+            {
+                UpdateSize();
+            }
         };
+        settings.PropertyChanged += settingsPropertyChangedHandler;
 
-        settings.Theme.PropertyChanged += (se, ev) =>
-        {
-            ThemeChanged();
-        };
+        themePropertyChangedHandler = (_, _) => ThemeChanged();
+        SubscribeToTheme(settings.Theme);
 
         PluginMetadata = pluginMetadata;
         this.settings = settings;
+        this.screenBounds = screenBounds;
+        this.screenDeviceName = screenDeviceName;
 
-        Left = settings.Position.X;
-        Top = settings.Position.Y;
-        Width = settings.Size.X;
-        Height = settings.Size.Y;
+        Point position = ScreenUtilities.PercentToPosition(settings.Position, screenBounds);
+        Point size = ScreenUtilities.PercentSizeToSize(settings.Size, screenBounds);
+        Left = position.X;
+        Top = position.Y;
+        Width = size.X;
+        Height = size.Y;
 
         PluginFolderPath = pluginFolderPath;
 
+        if (settings.Owner is not null)
+        {
+            synchronizer = Manager.Instance.GetSettingSynchronizer(settings.Owner, PluginMetadata.Id);
+            synchronizer.Register(this);
+        }
+
         if (pluginMetadata.SupportsUnloading && !string.IsNullOrEmpty(pluginFolderPath))
         {
             InitializeHotReload();
         }
     }
 
+    private void SubscribeToTheme(Theme theme)
+    {
+        if (ReferenceEquals(subscribedTheme, theme))
+        {
+            return;
+        }
+
+        if (subscribedTheme is not null)
+        {
+            subscribedTheme.PropertyChanged -= themePropertyChangedHandler;
+        }
+
+        subscribedTheme = theme;
+        subscribedTheme.PropertyChanged += themePropertyChangedHandler;
+    }
+
     public void Exit()
     {
         IsRunning = false;
@@ -120,6 +168,49 @@ public partial class WebPluginWindow : Window, IPluginWindow
         }
     }
 
+    public void ApplySettingValue(string id, string value)
+    {
+        if (localSettings.TryGetValue(id, out Setting? setting) && setting.GetJsonValue() != value)
+        {
+            setting.SetJsonValue(value);
+        }
+    }
+
+    public void ApplyButtonClick(string id)
+    {
+        if (!localSettings.TryGetValue(id, out Setting? setting) || setting is not Button button)
+        {
+            return;
+        }
+
+        suppressButtonSync = true;
+        try
+        {
+            button.Click();
+        }
+        finally
+        {
+            suppressButtonSync = false;
+        }
+    }
+
+    public void SetRenderPaused(bool paused)
+    {
+        if (webView.CoreWebView2 is null)
+        {
+            return;
+        }
+
+        if (paused)
+        {
+            _ = webView.CoreWebView2.TrySuspendAsync();
+        }
+        else
+        {
+            webView.CoreWebView2.Resume();
+        }
+    }
+
     protected override void OnSourceInitialized(EventArgs e)
     {
         base.OnSourceInitialized(e);
@@ -127,6 +218,9 @@ public partial class WebPluginWindow : Window, IPluginWindow
         WindowInteropHelper helper = new(this);
         _ = WindowPos.SetWindowLong(helper.Handle, WindowPos.GWL_EXSTYLE,
         WindowPos.GetWindowLong(helper.Handle, WindowPos.GWL_EXSTYLE) | WindowPos.WS_EX_NOACTIVATE);
+
+        HwndSource.FromHwnd(helper.Handle)?.AddHook((IntPtr hwnd, int msg, IntPtr _, IntPtr lParam, ref bool _) =>
+            ScreenUtilities.ClampToScreenHook(hwnd, msg, lParam, screenBounds));
     }
 
     private async void Window_ContentRendered(object? sender, EventArgs e)
@@ -249,6 +343,18 @@ public partial class WebPluginWindow : Window, IPluginWindow
 
         reloadDebounceTimer?.Stop();
         reloadDebounceTimer?.Dispose();
+        reloadDebounceTimer = null;
+
+        UnsubscribeEvents();
+
+        if (synchronizer is not null && settings.Owner is not null)
+        {
+            if (synchronizer.Unregister(this))
+            {
+                Manager.Instance.ReleaseSettingSynchronizer(settings.Owner, PluginMetadata.Id);
+            }
+            synchronizer = null;
+        }
 
         try
         {
@@ -263,14 +369,85 @@ public partial class WebPluginWindow : Window, IPluginWindow
         }
     }
 
+    private void UnsubscribeEvents()
+    {
+        settings.PropertyChanged -= settingsPropertyChangedHandler;
+
+        if (subscribedTheme is not null)
+        {
+            subscribedTheme.PropertyChanged -= themePropertyChangedHandler;
+            subscribedTheme = null;
+        }
+
+        foreach ((Setting setting, Action handler) in subscribedSettings)
+        {
+            setting.OnValueChanged -= handler;
+        }
+        subscribedSettings.Clear();
+
+        foreach ((Button button, Action handler) in subscribedButtonClicks)
+        {
+            button.OnClick -= handler;
+        }
+        subscribedButtonClicks.Clear();
+
+        localSettings.Clear();
+    }
+
+    private void UpdatePosition()
+    {
+        if (isUpdatingPosition)
+        {
+            return;
+        }
+
+        Point position = ScreenUtilities.PercentToPosition(settings.Position, screenBounds);
+        if (position == new Point(Left, Top))
+        {
+            return;
+        }
+
+        isUpdatingPosition = true;
+        Left = position.X;
+        Top = position.Y;
+        isUpdatingPosition = false;
+    }
+
+    private void UpdateSize()
+    {
+        if (isUpdatingPosition)
+        {
+            return;
+        }
+
+        Point size = ScreenUtilities.PercentSizeToSize(settings.Size, screenBounds);
+        if (size == new Point(Width, Height))
+        {
+            return;
+        }
+
+        isUpdatingPosition = true;
+        Width = size.X;
+        Height = size.Y;
+        isUpdatingPosition = false;
+    }
+
     private void Window_LocationChanged(object sender, EventArgs e)
     {
-        settings.Position = new System.Windows.Point(Left, Top);
+        if (isUpdatingPosition)
+        {
+            return;
+        }
+
+        settings.Position = ScreenUtilities.PositionToPercent(new Point(Left, Top), screenBounds);
     }
 
     private void Window_SizeChanged(object sender, SizeChangedEventArgs e)
     {
-        settings.Size = new System.Windows.Point(Width, Height);
+        if (!isUpdatingPosition)
+        {
+            settings.Size = ScreenUtilities.SizeToPercent(new Point(Width, Height), screenBounds);
+        }
 
         tileBar.CaptionHeight = ActualHeight - 10;
     }
@@ -330,19 +507,30 @@ public partial class WebPluginWindow : Window, IPluginWindow
                     continue;
                 }
 
+                localSettings[id] = setting;
+
                 SettingElement settingElement = new(setting, id, name, orderIndex);
 
                 if (settings.Settings.Exists(e => e.Id == id))
                 {
                     SettingElement saved = settings.Settings.First(e => e.Id == id);
-                    settingElement.JsonValue = saved.JsonValue;
+                    string savedValue = saved.JsonValue;
+                    if (!string.IsNullOrEmpty(savedValue) || setting is not Label and not Button)
+                    {
+                        settingElement.JsonValue = savedValue;
+                    }
                 }
 
                 string capturedId = id;
                 if (setting is Button button)
                 {
-                    button.OnClick += () =>
+                    Action clickHandler = () =>
                     {
+                        if (!suppressButtonSync)
+                        {
+                            synchronizer?.ButtonClicked(this, capturedId);
+                        }
+
                         _ = webView.Dispatcher.InvokeAsync(async () =>
                         {
                             try
@@ -355,10 +543,14 @@ public partial class WebPluginWindow : Window, IPluginWindow
                             }
                         });
                     };
+                    button.OnClick += clickHandler;
+                    subscribedButtonClicks.Add((button, clickHandler));
                 }
 
-                setting.OnValueChanged += () =>
+                Action valueChangedHandler = () =>
                 {
+                    synchronizer?.SettingChanged(this, capturedId, setting.GetJsonValue());
+
                     _ = webView.Dispatcher.InvokeAsync(async () =>
                     {
                         try
@@ -371,6 +563,8 @@ public partial class WebPluginWindow : Window, IPluginWindow
                         }
                     });
                 };
+                setting.OnValueChanged += valueChangedHandler;
+                subscribedSettings.Add((setting, valueChangedHandler));
 
                 settingElements.Add(settingElement);
                 orderIndex++;
@@ -540,7 +734,7 @@ public partial class WebPluginWindow : Window, IPluginWindow
         Dictionary<string, object?> dict = [];
         foreach (SettingElement element in settings.Settings)
         {
-            dict[element.Id] = GetSettingValue(element.Input);
+            dict[element.Id] = GetSettingValue(element.Input!);
         }
         return JsonSerializer.Serialize(dict);
     }

src/DesktopMagic/Resources/Strings/StringResources.de.xaml

@@ -40,6 +40,8 @@
     <system:String x:Key="weather">Wetter</system:String>
     <system:String x:Key="nextMeetingCountdown">Nächstes Meeting Countdown</system:String>
     <system:String x:Key="agenda">Agenda</system:String>
+    <system:String x:Key="benchmark">Performance Benchmark</system:String>
+    <system:String x:Key="skiaBenchmark">SkiaSharp Benchmark</system:String>
     <system:String x:Key="amplifier">Signalverstärkung:</system:String>
     <system:String x:Key="newLayout">Neues Layout</system:String>
     <system:String x:Key="deleteLayout">Layout Löschen</system:String>
@@ -53,6 +55,7 @@
     <system:String x:Key="confirmDeleteTheme">Möchten Sie dieses Theme wirklich löschen?</system:String>
     <system:String x:Key="enterLayoutName">Layoutnamen eingeben:</system:String>
     <system:String x:Key="layoutAlreadyExists">Layout existiert bereits!</system:String>
+    <system:String x:Key="cannotDeleteEmptyLayout">Das leere Layout kann nicht gelöscht werden!</system:String>
     <system:String x:Key="enterThemeName">Themenamen eingeben:</system:String>
     <system:String x:Key="themeAlreadyExists">Theme existiert bereits!</system:String>
     <system:String x:Key="install">Installieren</system:String>
@@ -67,6 +70,30 @@
     <system:String x:Key="releaseInfoPublishedFormat">Veröffentlicht: {0}</system:String>
     <system:String x:Key="releaseInfoBodyLabel">Release Notes:</system:String>
     <system:String x:Key="openReleasePage">Release-Seite öffnen</system:String>
+    <system:String x:Key="close">Schließen</system:String>
+    <system:String x:Key="overwrite">Überschreiben</system:String>
+    <system:String x:Key="keepMine">Meine behalten</system:String>
+    <system:String x:Key="shareOnModIo">Auf mod.io teilen</system:String>
+    <system:String x:Key="updateOnModIo">Auf mod.io aktualisieren</system:String>
+    <system:String x:Key="sharedOnModIo">Auf mod.io ansehen</system:String>
+    <system:String x:Key="shareCopyOnModIo">Als neu auf mod.io teilen</system:String>
+    <system:String x:Key="enterModIoSummary">Kurze Zusammenfassung für mod.io eingeben:</system:String>
+    <system:String x:Key="enterModIoChangelog">Was hat sich geändert? (optional)</system:String>
+    <system:String x:Key="modIoShareLayoutWarning">Jeder auf mod.io kann dieses Layout herunterladen. Es enthält die aktivierten Widgets, ihre Positionen, die verwendeten Themes und ihre Nicht-Text-Einstellungen. Text-Einstellungen (z. B. URLs, Orte oder Dateipfade) und gespeicherte Widget-Daten werden nicht geteilt.</system:String>
+    <system:String x:Key="modIoShareThemeWarning">Jeder auf mod.io kann dieses Theme herunterladen.</system:String>
+    <system:String x:Key="modIoLocalPluginsWarning">Diese Widgets sind lokale Plugins, die andere nicht installieren können: {0}</system:String>
+    <system:String x:Key="modIoShareSuccess">"{0}" wurde auf mod.io veröffentlicht.</system:String>
+    <system:String x:Key="modIoUpdateSuccess">Das Update von "{0}" wurde auf mod.io veröffentlicht.</system:String>
+    <system:String x:Key="modIoShareFailed">Teilen auf mod.io fehlgeschlagen: {0}</system:String>
+    <system:String x:Key="modIoSessionExpired">Ihre mod.io-Sitzung ist abgelaufen. Bitte melden Sie sich erneut an.</system:String>
+    <system:String x:Key="modIoUpdateConflict">"{0}" wurde auf mod.io aktualisiert, aber Sie haben es auch lokal geändert. Ihre Änderungen mit der neuen Version überschreiben?</system:String>
+    <system:String x:Key="cannotShareEmptyLayout">Das leere Layout kann nicht geteilt werden!</system:String>
+    <system:String x:Key="layouts">Layouts</system:String>
+    <system:String x:Key="searchModIo">mod.io durchsuchen...</system:String>
+    <system:String x:Key="searchInstalled">Installierte durchsuchen...</system:String>
+    <system:String x:Key="nothingFound">Nichts gefunden!</system:String>
+    <system:String x:Key="modIoInstallFailed">Installation von "{0}" fehlgeschlagen: {1}</system:String>
+    <system:String x:Key="uploadingToModIo">Wird auf mod.io hochgeladen...</system:String>
     <col:ArrayList x:Key="musicVisualizerOptionsComboboxItems">
         <system:String>Unten</system:String>
         <system:String>Mitte</system:String>

src/DesktopMagic/Resources/Strings/StringResources.en.xaml

@@ -40,6 +40,8 @@
     <system:String x:Key="weather">Weather</system:String>
     <system:String x:Key="nextMeetingCountdown">Next Meeting Countdown</system:String>
     <system:String x:Key="agenda">Agenda</system:String>
+    <system:String x:Key="benchmark">Performance Benchmark</system:String>
+    <system:String x:Key="skiaBenchmark">SkiaSharp Benchmark</system:String>
     <system:String x:Key="amplifier">Signal Amplification:</system:String>
     <system:String x:Key="newLayout">New Layout</system:String>
     <system:String x:Key="deleteLayout">Delete Layout</system:String>
@@ -54,6 +56,7 @@
     <system:String x:Key="enterLayoutName">Enter layout name</system:String>
     <system:String x:Key="layoutAlreadyExists">Layout already exists!</system:String>
     <system:String x:Key="cannotDeleteLastLayout">Can't delete last layout!</system:String>
+    <system:String x:Key="cannotDeleteEmptyLayout">Can't delete the empty layout!</system:String>
     <system:String x:Key="enterThemeName">Enter theme name</system:String>
     <system:String x:Key="themeAlreadyExists">Theme already exists!</system:String>
     <system:String x:Key="cannotDeleteLastTheme">Can't delete last theme!</system:String>
@@ -69,6 +72,30 @@
     <system:String x:Key="releaseInfoPublishedFormat">Published: {0}</system:String>
     <system:String x:Key="releaseInfoBodyLabel">Release notes:</system:String>
     <system:String x:Key="openReleasePage">Open release page</system:String>
+    <system:String x:Key="close">Close</system:String>
+    <system:String x:Key="overwrite">Overwrite</system:String>
+    <system:String x:Key="keepMine">Keep mine</system:String>
+    <system:String x:Key="shareOnModIo">Share on mod.io</system:String>
+    <system:String x:Key="updateOnModIo">Update on mod.io</system:String>
+    <system:String x:Key="sharedOnModIo">View on mod.io</system:String>
+    <system:String x:Key="shareCopyOnModIo">Share as new on mod.io</system:String>
+    <system:String x:Key="enterModIoSummary">Enter a short summary shown on mod.io:</system:String>
+    <system:String x:Key="enterModIoChangelog">What changed? (optional)</system:String>
+    <system:String x:Key="modIoShareLayoutWarning">Everyone on mod.io will be able to download this layout. It includes the enabled widgets, their positions, the used themes and their non-text settings. Text settings (e.g. URLs, locations or file paths) and saved widget data are not shared.</system:String>
+    <system:String x:Key="modIoShareThemeWarning">Everyone on mod.io will be able to download this theme.</system:String>
+    <system:String x:Key="modIoLocalPluginsWarning">These widgets are local plugins that others cannot install: {0}</system:String>
+    <system:String x:Key="modIoShareSuccess">"{0}" was published on mod.io.</system:String>
+    <system:String x:Key="modIoUpdateSuccess">The update of "{0}" was published on mod.io.</system:String>
+    <system:String x:Key="modIoShareFailed">Sharing on mod.io failed: {0}</system:String>
+    <system:String x:Key="modIoSessionExpired">Your mod.io session has expired. Please log in again.</system:String>
+    <system:String x:Key="modIoUpdateConflict">"{0}" was updated on mod.io, but you also changed it locally. Overwrite your changes with the new version?</system:String>
+    <system:String x:Key="cannotShareEmptyLayout">The empty layout cannot be shared!</system:String>
+    <system:String x:Key="layouts">Layouts</system:String>
+    <system:String x:Key="searchModIo">Search mod.io...</system:String>
+    <system:String x:Key="searchInstalled">Search installed...</system:String>
+    <system:String x:Key="nothingFound">Nothing found!</system:String>
+    <system:String x:Key="modIoInstallFailed">Installing "{0}" failed: {1}</system:String>
+    <system:String x:Key="uploadingToModIo">Uploading to mod.io...</system:String>
     <col:ArrayList x:Key="musicVisualizerOptionsComboboxItems">
         <system:String>Bottom</system:String>
         <system:String>Middle</system:String>

src/DesktopMagic/Settings/DesktopMagicSettings.cs

@@ -1,5 +1,6 @@
 using DesktopMagic.Plugins;
 
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.ComponentModel;
 using System.Linq;
@@ -22,7 +23,13 @@ public class DesktopMagicSettings : INotifyPropertyChanged
         init
         {
             themes = value;
-            themes.CollectionChanged += (s, e) => CurrentLayout.UpdateTheme();
+            themes.CollectionChanged += (s, e) =>
+            {
+                foreach (Layout layout in layouts)
+                {
+                    layout.UpdateTheme();
+                }
+            };
             OnPropertyChanged();
         }
     }
@@ -62,13 +69,33 @@ public class DesktopMagicSettings : INotifyPropertyChanged
         }
     }
 
+    /// <summary>
+    /// Maps screen device names (e.g. "\\.\DISPLAY1") to the layout applied on that screen.
+    /// The layouts themselves are portable and store their target aspect ratio.
+    /// </summary>
+    public Dictionary<string, string> ScreenLayouts { get; set; } = [];
+
+    /// <summary>
+    /// Version of the settings schema, used to migrate older settings files.
+    /// 0 = legacy (layouts not screen aware, pixel based positions).
+    /// </summary>
+    public int SchemaVersion { get; set; }
+
     public string? ModIoAccessToken { get; set; }
 
     public string? ReleaseInfoLastAppVersion { get; set; }
 
+    public bool IsFirstRun { get; set; } = true;
+
     public DesktopMagicSettings()
     {
-        themes.CollectionChanged += (s, e) => CurrentLayout.UpdateTheme();
+        themes.CollectionChanged += (s, e) =>
+        {
+            foreach (Layout layout in layouts)
+            {
+                layout.UpdateTheme();
+            }
+        };
 
         layouts.CollectionChanged += (s, e) => OnPropertyChanged(nameof(CurrentLayout));
         layouts.CollectionChanged += (s, e) => OnPropertyChanged(nameof(CurrentLayoutName));

src/DesktopMagic/Settings/Layout.cs

@@ -9,13 +9,31 @@ using System.Text.Json.Serialization;
 
 namespace DesktopMagic.Settings;
 
-public class Layout(string name) : INotifyPropertyChanged
+public class Layout(string name) : INotifyPropertyChanged, IModIoShareable
 {
     public event PropertyChangedEventHandler? PropertyChanged;
 
     private string name = name;
     private string? currentThemeName = null;
     private Dictionary<uint, PluginSettings> plugins = [];
+    private double screenAspectRatio = 0;
+    private ModIoShareState shareState;
+
+    public ModIoLink? ModIo { get; set; }
+
+    [JsonIgnore]
+    public ModIoShareState ShareState
+    {
+        get => shareState;
+        set
+        {
+            if (shareState != value)
+            {
+                shareState = value;
+                OnPropertyChanged();
+            }
+        }
+    }
 
     [JsonIgnore]
     public Theme Theme
@@ -60,6 +78,23 @@ public class Layout(string name) : INotifyPropertyChanged
         }
     }
 
+    /// <summary>
+    /// Aspect ratio (Width / Height) of the screen this layout was designed for.
+    /// Used to match layouts to screens and to make layouts portable across screens.
+    /// </summary>
+    public double ScreenAspectRatio
+    {
+        get => screenAspectRatio;
+        set
+        {
+            if (screenAspectRatio != value)
+            {
+                screenAspectRatio = value;
+                OnPropertyChanged();
+            }
+        }
+    }
+
     public void UpdatePlugins()
     {
         plugins = plugins.ToDictionary();

src/DesktopMagic/Settings/ModIoLink.cs

@@ -0,0 +1,48 @@
+using System;
+
+namespace DesktopMagic.Settings;
+
+/// <summary>
+/// Connects a local layout or theme to the mod.io mod it was published as or downloaded from.
+/// </summary>
+public class ModIoLink
+{
+    public uint ModId { get; set; }
+
+    /// <summary>
+    /// The modfile (version) the local copy is based on.
+    /// </summary>
+    public uint ModfileId { get; set; }
+
+    /// <summary>
+    /// Hash of the shareable content at the last publish or download, used to detect local changes.
+    /// </summary>
+    public string? PublishedHash { get; set; }
+
+    /// <summary>
+    /// Whether the logged in mod.io user submitted the mod and is therefore allowed to upload new versions.
+    /// </summary>
+    public bool IsOwner { get; set; }
+
+    public Uri? ProfileUri { get; set; }
+}
+
+public enum ModIoShareState
+{
+    NotShared,
+    UpToDate,
+    Modified,
+    NotOwner
+}
+
+/// <summary>
+/// A local item (layout or theme) that can be shared on mod.io.
+/// </summary>
+public interface IModIoShareable
+{
+    string Name { get; }
+
+    ModIoLink? ModIo { get; set; }
+
+    ModIoShareState ShareState { get; set; }
+}

src/DesktopMagic/Settings/PluginSettings.cs

@@ -19,20 +19,24 @@ public class PluginSettings : INotifyPropertyChanged
     private List<SettingElement> settings = [];
     private Dictionary<string, JsonElement> state = [];
     private bool enabled = false;
-    private Point position = new Point(100, 100);
-    private Point size = new Point(300, 300);
+    private Point position = new Point(0.05, 0.05);
+    private Point size = new Point(0.3, 0.3);
 
     // Only for internal use to show the name of the plugin in the main window
     [JsonIgnore]
     public PluginMetadata Metadata { get; set; } = new();
 
+    // The layout this plugin belongs to, used to resolve the fallback theme
+    [JsonIgnore]
+    public Layout? Owner { get; set; }
+
     [JsonIgnore]
     public Theme Theme
     {
         get
         {
             DesktopMagicSettings settings = MainWindowDataContext.GetSettings();
-            return settings.Themes.FirstOrDefault(t => t.Name == currentThemeName) ?? settings.CurrentLayout.Theme;
+            return settings.Themes.FirstOrDefault(t => t.Name == currentThemeName) ?? Owner?.Theme ?? settings.CurrentLayout.Theme;
         }
     }
 
@@ -93,6 +97,9 @@ public class PluginSettings : INotifyPropertyChanged
         }
     }
 
+    /// <summary>
+    /// Position of the plugin window as percentages (0..1) of the owning screen's bounds.
+    /// </summary>
     public Point Position
     {
         get => position;
@@ -106,6 +113,9 @@ public class PluginSettings : INotifyPropertyChanged
         }
     }
 
+    /// <summary>
+    /// Size of the plugin window as percentages (0..1) of the owning screen's bounds.
+    /// </summary>
     public Point Size
     {
         get => size;

src/DesktopMagicPluginAPI/DesktopMagic.Api.csproj

@@ -4,11 +4,11 @@
     <TargetFramework>net8.0-windows</TargetFramework>
     <Company>Stone_Red</Company>
     <Product>Stone_Red</Product>
-    <Version>1.0.0.0</Version>
+    <Version>1.1.0.0</Version>
     <RepositoryUrl>https://github.com/Stone-Red-Code/DesktopMagic</RepositoryUrl>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <AssemblyVersion>1.0.0.0</AssemblyVersion>
+    <AssemblyVersion>1.1.0.0</AssemblyVersion>
     <PackageProjectUrl></PackageProjectUrl>
     <FileVersion></FileVersion>
     <Nullable>enable</Nullable>
@@ -49,6 +49,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="SkiaSharp" Version="4.148.0" />
     <PackageReference Include="System.Drawing.Common" Version="8.0.0" />
   </ItemGroup>
 

src/DesktopMagicPluginAPI/IPluginData.cs

@@ -13,10 +13,16 @@ public interface IPluginData
     ITheme Theme { get; }
 
     /// <summary>
-    /// Gets the window size of the plugin window.
+    /// Gets the window size of the plugin window in device independent pixels.
     /// </summary>
     Size WindowSize { get; }
 
+    /// <summary>
+    /// Gets the window size of the plugin window in physical (device) pixels.
+    /// Use this to create a rendering surface that maps 1:1 to the display.
+    /// </summary>
+    Size WindowPixelSize { get; }
+
     /// <summary>
     /// Gets the window position of the plugin window.
     /// </summary>

src/DesktopMagicPluginAPI/KeyEventArgs.cs

@@ -0,0 +1,46 @@
+using System;
+
+namespace DesktopMagic.Api;
+
+/// <summary>
+/// Provides data for keyboard events.
+/// </summary>
+public class KeyEventArgs : EventArgs
+{
+    /// <summary>
+    /// The key that was pressed or released.
+    /// </summary>
+    public Keys Key { get; }
+
+    /// <summary>
+    /// Whether the Alt modifier was pressed.
+    /// </summary>
+    public bool Alt { get; }
+
+    /// <summary>
+    /// Whether the Control modifier was pressed.
+    /// </summary>
+    public bool Control { get; }
+
+    /// <summary>
+    /// Whether the Shift modifier was pressed.
+    /// </summary>
+    public bool Shift { get; }
+
+    /// <summary>
+    /// Whether the Windows logo key was pressed.
+    /// </summary>
+    public bool Windows { get; }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="KeyEventArgs"/> class.
+    /// </summary>
+    public KeyEventArgs(Keys key, bool alt, bool control, bool shift, bool windows)
+    {
+        Key = key;
+        Alt = alt;
+        Control = control;
+        Shift = shift;
+        Windows = windows;
+    }
+}

src/DesktopMagicPluginAPI/Keys.cs

@@ -0,0 +1,160 @@
+#pragma warning disable CS1591
+
+namespace DesktopMagic.Api;
+
+/// <summary>
+/// Defines keyboard keys available for plugin input handling.
+/// Values match <c>System.Windows.Input.Key</c> for direct casting.
+/// </summary>
+public enum Keys
+{
+    None = 0,
+    Cancel = 1,
+    Back = 2,
+    Tab = 3,
+    LineFeed = 4,
+    Clear = 5,
+    Return = 6,
+    Enter = 6,
+    ShiftKey = 16,
+    ControlKey = 17,
+    AltKey = 18,
+    Pause = 19,
+    CapsLock = 20,
+    Escape = 27,
+    Space = 32,
+    PageUp = 33,
+    PageDown = 34,
+    End = 35,
+    Home = 36,
+    Left = 37,
+    Up = 38,
+    Right = 39,
+    Down = 40,
+    Select = 41,
+    Print = 42,
+    Execute = 43,
+    PrintScreen = 44,
+    Insert = 45,
+    Delete = 46,
+    Help = 47,
+    D0 = 48,
+    D1 = 49,
+    D2 = 50,
+    D3 = 51,
+    D4 = 52,
+    D5 = 53,
+    D6 = 54,
+    D7 = 55,
+    D8 = 56,
+    D9 = 57,
+    A = 65,
+    B = 66,
+    C = 67,
+    D = 68,
+    E = 69,
+    F = 70,
+    G = 71,
+    H = 72,
+    I = 73,
+    J = 74,
+    K = 75,
+    L = 76,
+    M = 77,
+    N = 78,
+    O = 79,
+    P = 80,
+    Q = 81,
+    R = 82,
+    S = 83,
+    T = 84,
+    U = 85,
+    V = 86,
+    W = 87,
+    X = 88,
+    Y = 89,
+    Z = 90,
+    LWin = 91,
+    RWin = 92,
+    Apps = 93,
+    Sleep = 95,
+    NumPad0 = 96,
+    NumPad1 = 97,
+    NumPad2 = 98,
+    NumPad3 = 99,
+    NumPad4 = 100,
+    NumPad5 = 101,
+    NumPad6 = 102,
+    NumPad7 = 103,
+    NumPad8 = 104,
+    NumPad9 = 105,
+    Multiply = 106,
+    Add = 107,
+    Separator = 108,
+    Subtract = 109,
+    Decimal = 110,
+    Divide = 111,
+    F1 = 112,
+    F2 = 113,
+    F3 = 114,
+    F4 = 115,
+    F5 = 116,
+    F6 = 117,
+    F7 = 118,
+    F8 = 119,
+    F9 = 120,
+    F10 = 121,
+    F11 = 122,
+    F12 = 123,
+    F13 = 124,
+    F14 = 125,
+    F15 = 126,
+    F16 = 127,
+    F17 = 128,
+    F18 = 129,
+    F19 = 130,
+    F20 = 131,
+    F21 = 132,
+    F22 = 133,
+    F23 = 134,
+    F24 = 135,
+    NumLock = 144,
+    Scroll = 145,
+    LeftShift = 160,
+    RightShift = 161,
+    LeftCtrl = 162,
+    RightCtrl = 163,
+    LeftAlt = 164,
+    RightAlt = 165,
+    BrowserBack = 166,
+    BrowserForward = 167,
+    BrowserRefresh = 168,
+    BrowserStop = 169,
+    BrowserSearch = 170,
+    BrowserFavorites = 171,
+    BrowserHome = 172,
+    VolumeMute = 173,
+    VolumeDown = 174,
+    VolumeUp = 175,
+    MediaNextTrack = 176,
+    MediaPreviousTrack = 177,
+    MediaStop = 178,
+    MediaPlayPause = 179,
+    LaunchMail = 180,
+    SelectMedia = 181,
+    LaunchApplication1 = 182,
+    LaunchApplication2 = 183,
+    OemSemicolon = 186,
+    OemPlus = 187,
+    OemComma = 188,
+    OemMinus = 189,
+    OemPeriod = 190,
+    OemQuestion = 191,
+    OemTilde = 192,
+    OemOpenBrackets = 219,
+    OemPipe = 220,
+    OemCloseBrackets = 221,
+    OemQuotes = 222,
+    Oem8 = 223,
+    OemBackslash = 226,
+}

src/DesktopMagicPluginAPI/Plugin.cs

@@ -99,6 +99,22 @@ public abstract class Plugin
     {
     }
 
+    /// <summary>
+    /// Occurs when a key is pressed while the plugin window has keyboard focus.
+    /// </summary>
+    /// <param name="e">The key event data.</param>
+    public virtual void OnKeyDown(KeyEventArgs e)
+    {
+    }
+
+    /// <summary>
+    /// Occurs when a key is released while the plugin window has keyboard focus.
+    /// </summary>
+    /// <param name="e">The key event data.</param>
+    public virtual void OnKeyUp(KeyEventArgs e)
+    {
+    }
+
     /// <summary>
     /// Occurs when the application's theme has changed.
     /// </summary>

src/DesktopMagicPluginAPI/Settings/Button.cs

@@ -46,4 +46,14 @@ public class Button : Setting
     {
         OnClick?.Invoke();
     }
+
+    internal override string GetJsonValue()
+    {
+        return Value;
+    }
+
+    internal override void SetJsonValue(string value)
+    {
+        Value = value;
+    }
 }

src/DesktopMagicPluginAPI/Settings/IntegerUpDown.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 
 namespace DesktopMagic.Api.Settings;
 
@@ -64,12 +65,17 @@ public class IntegerUpDown : Setting
 
     internal override string GetJsonValue()
     {
-        return Value.ToString();
+        return Value.ToString(CultureInfo.InvariantCulture);
     }
 
     internal override void SetJsonValue(string value)
     {
-        _ = int.TryParse(value, out int result);
+        // Values saved by older versions use the current culture (e.g. a culture specific minus sign), so fall back to it.
+        if (!int.TryParse(value, NumberStyles.Integer, CultureInfo.InvariantCulture, out int result))
+        {
+            _ = int.TryParse(value, NumberStyles.Integer, CultureInfo.CurrentCulture, out result);
+        }
+
         Value = result;
     }
 }

src/DesktopMagicPluginAPI/Settings/Label.cs

@@ -38,4 +38,14 @@ public class Label : Setting
         Value = value;
         Bold = bold;
     }
+
+    internal override string GetJsonValue()
+    {
+        return Value;
+    }
+
+    internal override void SetJsonValue(string value)
+    {
+        Value = value;
+    }
 }

src/DesktopMagicPluginAPI/Settings/Slider.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
 
 namespace DesktopMagic.Api.Settings;
 
@@ -65,12 +66,18 @@ public sealed class Slider : Setting
 
     internal override string GetJsonValue()
     {
-        return Value.ToString();
+        return Value.ToString(CultureInfo.InvariantCulture);
     }
 
     internal override void SetJsonValue(string value)
     {
-        _ = double.TryParse(value, out double result);
+        // Values saved by older versions use the current culture (e.g. "30,5"), so fall back to it.
+        // Thousands separators are not allowed, otherwise "30,5" would be read as 305 by the invariant culture.
+        if (!double.TryParse(value, NumberStyles.Float, CultureInfo.InvariantCulture, out double result))
+        {
+            _ = double.TryParse(value, NumberStyles.Float, CultureInfo.CurrentCulture, out result);
+        }
+
         Value = result;
     }
 }

src/DesktopMagicPluginAPI/SkiaAsyncPlugin.cs

@@ -0,0 +1,48 @@
+using SkiaSharp;
+
+using System.ComponentModel;
+using System.Drawing;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DesktopMagic.Api;
+
+/// <summary>
+/// Infrastructure base class of <see cref="SkiaAsyncPlugin"/>. Derive from <see cref="SkiaAsyncPlugin"/> instead.
+/// </summary>
+/// <remarks>This class only exists to seal the <see cref="Bitmap"/> based <see cref="AsyncPlugin.MainAsync"/> method,
+/// so that <see cref="SkiaAsyncPlugin"/> can declare its own <see cref="SkiaAsyncPlugin.MainAsync"/> method returning an <see cref="SKImage"/>.</remarks>
+[EditorBrowsable(EditorBrowsableState.Never)]
+public abstract class SkiaAsyncPluginBase : AsyncPlugin
+{
+    /// <summary>
+    /// This method should not be called directly! Override and use <see cref="SkiaAsyncPlugin.MainAsync"/> for asynchronous Skia plugin rendering.
+    /// </summary>
+    /// <remarks>This method only exists to fulfill base class requirements.</remarks>
+    /// <param name="cancellationToken">Token signaled when the host requests cancellation.</param>
+    /// <returns>A task that always resolves to <see langword="null"/>.</returns>
+    public sealed override Task<Bitmap?> MainAsync(CancellationToken cancellationToken)
+    {
+        return Task.FromResult<Bitmap?>(null);
+    }
+}
+
+/// <summary>
+/// Provides an abstract base class for creating asynchronous plugins that render with SkiaSharp and can be integrated into the application,
+/// supporting periodic updates, rendering, and user interaction.
+/// </summary>
+/// <remarks>Derive from this class to implement custom plugin functionality. The class defines lifecycle methods
+/// such as <see cref="AsyncPlugin.StartAsync"/>, <see cref="AsyncPlugin.StopAsync"/>, and <see cref="MainAsync"/> for activation, deactivation, and periodic
+/// execution. It also provides event handlers for mouse and theme interactions, as well as access to application data
+/// and rendering configuration. Implementations should override relevant methods to respond to user input, update
+/// intervals, and configuration changes as needed. The image returned by <see cref="MainAsync"/> is scaled to fit the
+/// plugin window while preserving its aspect ratio.</remarks>
+public abstract class SkiaAsyncPlugin : SkiaAsyncPluginBase
+{
+    /// <summary>
+    /// Occurs when the <see cref="Plugin.UpdateInterval"/> elapses.
+    /// </summary>
+    /// <param name="cancellationToken">Token signaled when the host requests cancellation.</param>
+    /// <returns>The rendered image, or <see langword="null"/> to keep the previous frame.</returns>
+    public new abstract Task<SKImage?> MainAsync(CancellationToken cancellationToken);
+}

src/DesktopMagicPluginAPI/SkiaPlugin.cs

@@ -0,0 +1,44 @@
+using SkiaSharp;
+
+using System.ComponentModel;
+using System.Drawing;
+
+namespace DesktopMagic.Api;
+
+/// <summary>
+/// Infrastructure base class of <see cref="SkiaPlugin"/>. Derive from <see cref="SkiaPlugin"/> instead.
+/// </summary>
+/// <remarks>This class only exists to seal the <see cref="Bitmap"/> based <see cref="Plugin.Main"/> method,
+/// so that <see cref="SkiaPlugin"/> can declare its own <see cref="SkiaPlugin.Main"/> method returning an <see cref="SKImage"/>.</remarks>
+[EditorBrowsable(EditorBrowsableState.Never)]
+public abstract class SkiaPluginBase : Plugin
+{
+    /// <summary>
+    /// This method should not be called directly! Override and use <see cref="SkiaPlugin.Main"/> for Skia plugin rendering.
+    /// </summary>
+    /// <remarks>This method only exists to fulfill base class requirements.</remarks>
+    /// <returns>Always <see langword="null"/>.</returns>
+    public sealed override Bitmap? Main()
+    {
+        return null;
+    }
+}
+
+/// <summary>
+/// Provides an abstract base class for creating plugins that render with SkiaSharp and can be integrated into the application,
+/// supporting periodic updates, rendering, and user interaction.
+/// </summary>
+/// <remarks>Derive from this class to implement custom plugin functionality. The class defines lifecycle methods
+/// such as <see cref="Plugin.Start"/>, <see cref="Plugin.Stop"/>, and <see cref="Main"/> for activation, deactivation, and periodic
+/// execution. It also provides event handlers for mouse and theme interactions, as well as access to application data
+/// and rendering configuration. Implementations should override relevant methods to respond to user input, update
+/// intervals, and configuration changes as needed. The image returned by <see cref="Main"/> is scaled to fit the
+/// plugin window while preserving its aspect ratio.</remarks>
+public abstract class SkiaPlugin : SkiaPluginBase
+{
+    /// <summary>
+    /// Occurs when the <see cref="Plugin.UpdateInterval"/> elapses.
+    /// </summary>
+    /// <returns>The rendered image, or <see langword="null"/> to keep the previous frame.</returns>
+    public new abstract SKImage? Main();
+}

src/MsixPackaging/Package.appxmanifest

@@ -9,7 +9,7 @@
   <Identity
     Name="StoneRed.DesktopMagic"
     Publisher="CN=6D1FD759-1951-428A-9B03-964461C7DBF5"
-    Version="1.3.3.0" />
+    Version="1.4.0.0" />
 
   <Properties>
     <DisplayName>Desktop Magic</DisplayName>