Add keyboard input support for plugins with key event handling

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

@@ -939,8 +939,10 @@ public partial class PluginWindow : Window, IPluginWindow
         tileBar.CaptionHeight = ActualHeight - 10;
     }
 
-    private void Window_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
+    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;
@@ -970,7 +972,7 @@ 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;
@@ -981,7 +983,7 @@ public partial class PluginWindow : Window, IPluginWindow
         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;
@@ -992,5 +994,39 @@ public partial class PluginWindow : Window, IPluginWindow
         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/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>