Fix some issues with the new theme support

src/DesktopMagic/MainWindow.xaml

@@ -77,13 +77,13 @@
                     </Grid.ColumnDefinitions>
                     <ListBox x:Name="themesListBox" Grid.Row="0" Grid.ColumnSpan="1" Margin="{StaticResource DefaultMargin}" ItemsSource="{Binding Settings.Themes}" DisplayMemberPath="Name" SelectedValue="{Binding Settings.CurrentLayout.CurrentThemeName}" SelectedValuePath="Name" />
                     <StackPanel Grid.Row="0" Grid.Column="1" VerticalAlignment="Center" Margin="{StaticResource DefaultMargin}">
-                        <Button x:Name="addThemeButton" Margin="0,0,0,5" HorizontalAlignment="Stretch" FontWeight="Regular">
+                        <Button x:Name="addThemeButton" Margin="0,0,0,5" HorizontalAlignment="Stretch" Click="AddThemeButton_Click" FontWeight="Regular">
                             <StackPanel Orientation="Horizontal">
                                 <materialDesign:PackIcon Kind="Add" Margin="0 0 10 0" />
                                 <TextBlock Text="{DynamicResource newTheme}" />
                             </StackPanel>
                         </Button>
-                        <Button x:Name="deleteThemeButton" Margin="0,0,0,5" HorizontalAlignment="Stretch" FontWeight="Regular">
+                        <Button x:Name="deleteThemeButton" Margin="0,0,0,5" HorizontalAlignment="Stretch" Click="DeleteThemeButton_Click" FontWeight="Regular">
                             <StackPanel Orientation="Horizontal">
                                 <materialDesign:PackIcon Kind="DeleteOutline" Margin="0 0 10 0" />
                                 <TextBlock Text="{DynamicResource deleteTheme}" />

src/DesktopMagic/MainWindow.xaml.cs

@@ -299,6 +299,39 @@ namespace DesktopMagic
 
         #region Options
 
+        private void AddThemeButton_Click(object sender, RoutedEventArgs e)
+        {
+            InputDialog inputDialog = new((string)FindResource("enterThemeName"))
+            {
+                Owner = this
+            };
+
+            if (inputDialog.ShowDialog() == true)
+            {
+                if (Settings.Themes.Any(l => l.Name.Trim() == inputDialog.ResponseText.Trim()))
+                {
+                    _ = MessageBox.Show((string)FindResource("themeAlreadyExists"), App.AppName, MessageBoxButton.OK, MessageBoxImage.Warning);
+                    return;
+                }
+
+                Settings.Themes.Add(new Theme(inputDialog.ResponseText.Trim()));
+                Settings.CurrentLayout.CurrentThemeName = inputDialog.ResponseText.Trim();
+                SaveSettings();
+            }
+        }
+
+        private void DeleteThemeButton_Click(object sender, RoutedEventArgs e)
+        {
+            if (Settings.Themes.Count <= 1)
+            {
+                _ = MessageBox.Show((string)FindResource("cannotDeleteLastTheme"), App.AppName, MessageBoxButton.OK, MessageBoxImage.Warning);
+                return;
+            }
+
+            Settings.Themes.Remove((Theme)themesListBox.SelectedItem);
+            SaveSettings();
+        }
+
         private void ChangeThemeButton_Click(object sender, RoutedEventArgs e)
         {
             Theme theme = themesListBox.SelectedItem as Theme ?? Settings.CurrentLayout.Theme;
@@ -428,6 +461,12 @@ namespace DesktopMagic
 
         private void RemoveLayoutButton_Click(object sender, RoutedEventArgs e)
         {
+            if (Settings.Layouts.Count <= 1)
+            {
+                _ = MessageBox.Show((string)FindResource("cannotDeleteLastLayout"), App.AppName, MessageBoxButton.OK, MessageBoxImage.Warning);
+                return;
+            }
+
             Settings.Layouts.Remove(Settings.CurrentLayout);
             SaveSettings();
         }
@@ -447,30 +486,27 @@ namespace DesktopMagic
         {
             if (!File.Exists(Path.Combine(App.ApplicationDataPath, "settings.json")))
             {
-                Settings = new DesktopMagicSettings()
-                {
-                    Layouts = [
-                        new Layout((string)FindResource("default"))
-                    ],
-                    Themes = [
-                        new Theme((string)FindResource("default"))
-                    ]
-                };
+                Settings = new DesktopMagicSettings();
+
+                Settings.Layouts.Add(new Layout((string)FindResource("default")));
+                Settings.Themes.Add(new Theme((string)FindResource("default")));
 
                 return;
             }
 
             string json = File.ReadAllText(Path.Combine(App.ApplicationDataPath, "settings.json"));
 
-            Settings = JsonSerializer.Deserialize<DesktopMagicSettings>(json, jsonSettingsOptions) ?? new DesktopMagicSettings()
+            Settings = JsonSerializer.Deserialize<DesktopMagicSettings>(json, jsonSettingsOptions) ?? new DesktopMagicSettings();
+
+            if(Settings.Layouts.Count == 0)
             {
-                Layouts = [
-                    new Layout((string)FindResource("default"))
-                ],
-                Themes = [
-                    new Theme((string)FindResource("default"))
-                ]
-            };
+                Settings.Layouts.Add(new Layout((string)FindResource("default")));
+            }
+
+            if (Settings.Themes.Count == 0)
+            {
+                Settings.Themes.Add(new Theme((string)FindResource("default")));
+            }
         }
 
         private void LoadLayout(bool minimize = true)

src/DesktopMagic/Plugins/PluginWindow.xaml.cs

@@ -56,7 +56,17 @@ public partial class PluginWindow : Window
 
         Owner = w;
 
-        settings.Theme.PropertyChanged += (e, s) => ThemeChanged();
+        settings.PropertyChanged += (e, s) =>
+        {
+            if (s.PropertyName == nameof(PluginSettings.CurrentThemeName))
+            {
+                settings.Theme.PropertyChanged += (se, ev) =>
+                {
+                    ThemeChanged();
+                };
+                ThemeChanged();
+            }
+        };
 
         PluginMetadata = pluginMetadata;
         this.settings = settings;

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

@@ -41,6 +41,8 @@
     <system:String x:Key="cancel">Abbrechen</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="enterThemeName">Themenamen eingeben:</system:String>
+    <system:String x:Key="themeAlreadyExists">Theme existiert bereits!</system:String>
     <system:String x:Key="install">Installieren</system:String>
     <system:String x:Key="uninstall">Deinstallieren</system:String>
     <system:String x:Key="remove">Entfernen</system:String>

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

@@ -41,6 +41,10 @@
     <system:String x:Key="cancel">Cancel</system:String>
     <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="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>
     <system:String x:Key="install">Install</system:String>
     <system:String x:Key="uninstall">Uninstall</system:String>
     <system:String x:Key="remove">Remove</system:String>

src/DesktopMagic/Settings/DesktopMagicSettings.cs

@@ -19,9 +19,10 @@ internal class DesktopMagicSettings : INotifyPropertyChanged
     public ObservableCollection<Theme> Themes
     {
         get => themes;
-        set
+        init
         {
             themes = value;
+            themes.CollectionChanged += (s, e) => CurrentLayout.UpdateTheme();
             OnPropertyChanged();
         }
     }
@@ -32,6 +33,8 @@ internal class DesktopMagicSettings : INotifyPropertyChanged
         set
         {
             layouts = value;
+            layouts.CollectionChanged += (s, e) => OnPropertyChanged(nameof(CurrentLayout));
+            layouts.CollectionChanged += (s, e) => OnPropertyChanged(nameof(CurrentLayoutName));
             OnPropertyChanged();
         }
     }
@@ -52,6 +55,14 @@ internal class DesktopMagicSettings : INotifyPropertyChanged
 
     public string? ModIoAccessToken { get; set; }
 
+    public DesktopMagicSettings()
+    {
+        themes.CollectionChanged += (s, e) => CurrentLayout.UpdateTheme();
+
+        layouts.CollectionChanged += (s, e) => OnPropertyChanged(nameof(CurrentLayout));
+        layouts.CollectionChanged += (s, e) => OnPropertyChanged(nameof(CurrentLayoutName));
+    }
+
     protected void OnPropertyChanged([CallerMemberName] string? name = null)
     {
         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));

src/DesktopMagic/Settings/Layout.cs

@@ -29,14 +29,13 @@ internal class Layout(string name) : INotifyPropertyChanged
 
     public string? CurrentThemeName
     {
-        get => currentThemeName;
+        get => Theme.Name;
         set
         {
             if (currentThemeName != value)
             {
                 currentThemeName = value;
-                OnPropertyChanged();
-                OnPropertyChanged(nameof(Theme));
+                UpdateTheme();
             }
         }
     }
@@ -67,6 +66,17 @@ internal class Layout(string name) : INotifyPropertyChanged
         OnPropertyChanged(nameof(Plugins));
     }
 
+    public void UpdateTheme()
+    {
+        OnPropertyChanged(nameof(Theme));
+        OnPropertyChanged(nameof(CurrentThemeName));
+
+        foreach (PluginSettings pluginSettings in plugins.Values)
+        {
+            pluginSettings.UpdateTheme();
+        }
+    }
+
     protected void OnPropertyChanged([CallerMemberName] string? propertyName = null)
     {
         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

src/DesktopMagic/Settings/PluginSettings.cs

@@ -100,6 +100,12 @@ public class PluginSettings : INotifyPropertyChanged
         }
     }
 
+    public void UpdateTheme()
+    {
+        OnPropertyChanged(nameof(Theme));
+        OnPropertyChanged(nameof(CurrentThemeName));
+    }
+
     protected void OnPropertyChanged([CallerMemberName] string? propertyName = null)
     {
         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));