Merge pull request #15 from RuntimeRascal/copilot/add-clear-canvas-hotkey

Add clear canvas hotkey (R key) with visual feedback

Author: RuntimeRascal

Src/GhostDraw/App.xaml.cs

@@ -73,6 +73,7 @@ protected override void OnStartup(StartupEventArgs e)
             _keyboardHook.HotkeyPressed += OnHotkeyPressed;
             _keyboardHook.HotkeyReleased += OnHotkeyReleased;
             _keyboardHook.EscapePressed += OnEscapePressed;
+            _keyboardHook.ClearCanvasPressed += OnClearCanvasPressed;
             _keyboardHook.Start();
 
             // Setup system tray icon
@@ -233,6 +234,23 @@ private void OnEscapePressed(object? sender, EventArgs e)
         }
     }
 
+    private void OnClearCanvasPressed(object? sender, EventArgs e)
+    {
+        try
+        {
+            // Only clear canvas if drawing mode is active
+            if (_drawingManager?.IsDrawingMode == true)
+            {
+                _logger?.LogInformation("R pressed - clearing canvas");
+                _drawingManager?.ClearCanvas();
+            }
+        }
+        catch (Exception ex)
+        {
+            _exceptionHandler?.HandleException(ex, "Clear canvas handler");
+        }
+    }
+
     protected override void OnExit(ExitEventArgs e)
     {
         _logger?.LogInformation("Application exiting");

Src/GhostDraw/Core/GlobalKeyboardHook.cs

@@ -12,6 +12,7 @@ public class GlobalKeyboardHook : IDisposable
 
     // Only keep VK_ESCAPE constant (emergency exit)
     private const int VK_ESCAPE = 0x1B;    // 27
+    private const int VK_R = 0x52;         // 82 - 'R' key for clear canvas
 
     private readonly ILogger<GlobalKeyboardHook> _logger;
     private readonly LowLevelKeyboardProc _proc;
@@ -23,6 +24,7 @@ public class GlobalKeyboardHook : IDisposable
     public event EventHandler? HotkeyPressed;
     public event EventHandler? HotkeyReleased;
     public event EventHandler? EscapePressed;
+    public event EventHandler? ClearCanvasPressed;
 
     // NEW: Raw key events for recorder
     public event EventHandler<KeyEventArgs>? KeyPressed;
@@ -181,6 +183,13 @@ private nint HookCallback(int nCode, nint wParam, nint lParam)
                     EscapePressed?.Invoke(this, EventArgs.Empty);
                 }
 
+                // Check for R key press (clear canvas)
+                if (vkCode == VK_R && isKeyDown)
+                {
+                    _logger.LogDebug("R key pressed - clear canvas request");
+                    ClearCanvasPressed?.Invoke(this, EventArgs.Empty);
+                }
+
                 // Track hotkey state
                 if (_hotkeyVKs.Contains(vkCode))
                 {

Src/GhostDraw/Managers/DrawingManager.cs

@@ -163,4 +163,28 @@ public void DisableDrawingMode()
             // Don't throw - this is for emergency cleanup
         }
     }
+
+    /// <summary>
+    /// Clears the canvas while keeping drawing mode active
+    /// </summary>
+    public void ClearCanvas()
+    {
+        try
+        {
+            if (_overlayWindow.IsVisible)
+            {
+                _logger.LogInformation("Clearing canvas (R key)");
+                _overlayWindow.ClearCanvas();
+            }
+            else
+            {
+                _logger.LogDebug("ClearCanvas ignored - overlay not visible");
+            }
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to clear canvas");
+            // Don't re-throw - not critical
+        }
+    }
 }

Src/GhostDraw/Views/OverlayWindow.xaml

@@ -41,5 +41,54 @@
                        Foreground="#FF0080"
                        Text="3 px"/>
         </Border>
+        
+        <!-- Canvas Cleared Toast (center of screen, cyberpunk style) -->
+        <Border x:Name="CanvasClearedToastBorder"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Center"
+                Padding="24,16"
+                Background="#1A1A2E"
+                BorderBrush="#00FF88"
+                BorderThickness="2"
+                CornerRadius="4"
+                Opacity="0"
+                IsHitTestVisible="False">
+            <Border.Effect>
+                <DropShadowEffect Color="#00FF88" 
+                                  Opacity="0.7" 
+                                  BlurRadius="20" 
+                                  ShadowDepth="0"/>
+            </Border.Effect>
+            <TextBlock x:Name="CanvasClearedToastText"
+                       FontFamily="Segoe UI"
+                       FontSize="28"
+                       FontWeight="Bold"
+                       Foreground="#00FF88"
+                       Text="Canvas Cleared"/>
+        </Border>
+        
+        <!-- Drawing Mode Hint (center of screen, fades out on activation) -->
+        <Border x:Name="DrawingModeHintBorder"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Bottom"
+                Margin="0,0,0,100"
+                Padding="20,12"
+                Background="#1A1A2E"
+                BorderBrush="#808080"
+                BorderThickness="1"
+                CornerRadius="4"
+                Opacity="0"
+                IsHitTestVisible="False">
+            <Border.Effect>
+                <DropShadowEffect Color="#808080" 
+                                  Opacity="0.5" 
+                                  BlurRadius="10" 
+                                  ShadowDepth="0"/>
+            </Border.Effect>
+            <TextBlock FontFamily="Segoe UI"
+                       FontSize="16"
+                       Foreground="#B0B0B0"
+                       Text="Press R to clear canvas  |  ESC to exit"/>
+        </Border>
     </Grid>
 </Window>