Refactor GlobalHotkeyService to support dynamic hotkey registration and update. Introduce HotkeyModifiers and HotkeyVirtualKey properties in SettingsService for user-defined hotkeys.

ClipForge/GlobalHotkeyService.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Runtime.InteropServices;
 using Microsoft.UI.Xaml;
 
@@ -6,39 +6,49 @@ namespace ClipForge
 {
     public class GlobalHotkeyService
     {
-        // These two lines talk directly to Windows to register/unregister hotkeys
         [DllImport("user32.dll")]
         private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
 
         [DllImport("user32.dll")]
         private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
 
-        // This is the ID we'll use to identify our clip hotkey
         private const int HOTKEY_CLIP = 1;
+        private const uint MOD_NOREPEAT = 0x4000; // don't fire on key repeat
 
-        // Alt key modifier
-        private const uint MOD_ALT = 0x0001;
-
-        // F9 key
-        private const uint VK_F9 = 0x78;
-
-        // This is the "event" that fires when the hotkey is pressed
         public event Action? ClipRequested;
 
         private IntPtr _hwnd;
+        private uint _modifiers;
+        private uint _vk;
 
-        public void Initialize(IntPtr hwnd)
+        /// <summary>Register the clip hotkey. Use settings values (e.g. HotkeyModifiers, HotkeyVirtualKey).</summary>
+        public void Initialize(IntPtr hwnd, uint modifiers, uint vk)
         {
             _hwnd = hwnd;
-            RegisterHotKey(_hwnd, HOTKEY_CLIP, MOD_ALT, VK_F9);
+            _modifiers = modifiers;
+            _vk = vk;
+            TryRegister();
+        }
+
+        /// <summary>Update the hotkey at runtime (e.g. after user remaps). Unregisters old and registers new.</summary>
+        public bool UpdateHotkey(uint modifiers, uint vk)
+        {
+            UnregisterHotKey(_hwnd, HOTKEY_CLIP);
+            _modifiers = modifiers;
+            _vk = vk;
+            return TryRegister();
+        }
+
+        private bool TryRegister()
+        {
+            uint mod = _modifiers | MOD_NOREPEAT;
+            return RegisterHotKey(_hwnd, HOTKEY_CLIP, mod, _vk);
         }
 
         public void ProcessHotkey(int id)
         {
             if (id == HOTKEY_CLIP)
-            {
                 ClipRequested?.Invoke();
-            }
         }
 
         public void Cleanup()