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()

ClipForge/HotkeyHelper.cs

@@ -0,0 +1,175 @@
+using System;
+using System.Collections.Generic;
+using Windows.System;
+
+namespace ClipForge
+{
+    /// <summary>Converts between hotkey modifier/vk and display strings.</summary>
+    public static class HotkeyHelper
+    {
+        public const uint MOD_ALT = 0x0001;
+        public const uint MOD_CONTROL = 0x0002;
+        public const uint MOD_SHIFT = 0x0004;
+        public const uint MOD_WIN = 0x0008;
+        public const uint MOD_NOREPEAT = 0x4000;
+
+        private static readonly Dictionary<VirtualKey, string> KeyNames = new()
+        {
+            { VirtualKey.LeftButton, "LMB" },
+            { VirtualKey.RightButton, "RMB" },
+            { VirtualKey.Cancel, "Cancel" },
+            { VirtualKey.Back, "Backspace" },
+            { VirtualKey.Tab, "Tab" },
+            { VirtualKey.Clear, "Clear" },
+            { VirtualKey.Enter, "Enter" },
+            { VirtualKey.Shift, "Shift" },
+            { VirtualKey.Control, "Ctrl" },
+            { VirtualKey.Menu, "Alt" },
+            { VirtualKey.Pause, "Pause" },
+            { VirtualKey.CapitalLock, "Caps Lock" },
+            { VirtualKey.Kana, "Kana" },
+            { VirtualKey.Hangul, "Hangul" },
+            { VirtualKey.Junja, "Junja" },
+            { VirtualKey.Final, "Final" },
+            { VirtualKey.Hanja, "Hanja" },
+            { VirtualKey.Kanji, "Kanji" },
+            { VirtualKey.Escape, "Escape" },
+            { VirtualKey.Convert, "Convert" },
+            { VirtualKey.NonConvert, "NonConvert" },
+            { VirtualKey.Accept, "Accept" },
+            { VirtualKey.ModeChange, "ModeChange" },
+            { VirtualKey.Space, "Space" },
+            { VirtualKey.PageUp, "PgUp" },
+            { VirtualKey.PageDown, "PgDn" },
+            { VirtualKey.End, "End" },
+            { VirtualKey.Home, "Home" },
+            { VirtualKey.Left, "Left" },
+            { VirtualKey.Up, "Up" },
+            { VirtualKey.Right, "Right" },
+            { VirtualKey.Down, "Down" },
+            { VirtualKey.Select, "Select" },
+            { VirtualKey.Print, "Print" },
+            { VirtualKey.Execute, "Execute" },
+            { VirtualKey.Snapshot, "Print Screen" },
+            { VirtualKey.Insert, "Insert" },
+            { VirtualKey.Delete, "Delete" },
+            { VirtualKey.Help, "Help" },
+            { VirtualKey.Number0, "0" },
+            { VirtualKey.Number1, "1" },
+            { VirtualKey.Number2, "2" },
+            { VirtualKey.Number3, "3" },
+            { VirtualKey.Number4, "4" },
+            { VirtualKey.Number5, "5" },
+            { VirtualKey.Number6, "6" },
+            { VirtualKey.Number7, "7" },
+            { VirtualKey.Number8, "8" },
+            { VirtualKey.Number9, "9" },
+            { VirtualKey.A, "A" },
+            { VirtualKey.B, "B" },
+            { VirtualKey.C, "C" },
+            { VirtualKey.D, "D" },
+            { VirtualKey.E, "E" },
+            { VirtualKey.F, "F" },
+            { VirtualKey.G, "G" },
+            { VirtualKey.H, "H" },
+            { VirtualKey.I, "I" },
+            { VirtualKey.J, "J" },
+            { VirtualKey.K, "K" },
+            { VirtualKey.L, "L" },
+            { VirtualKey.M, "M" },
+            { VirtualKey.N, "N" },
+            { VirtualKey.O, "O" },
+            { VirtualKey.P, "P" },
+            { VirtualKey.Q, "Q" },
+            { VirtualKey.R, "R" },
+            { VirtualKey.S, "S" },
+            { VirtualKey.T, "T" },
+            { VirtualKey.U, "U" },
+            { VirtualKey.V, "V" },
+            { VirtualKey.W, "W" },
+            { VirtualKey.X, "X" },
+            { VirtualKey.Y, "Y" },
+            { VirtualKey.Z, "Z" },
+            { VirtualKey.LeftWindows, "Win" },
+            { VirtualKey.RightWindows, "Win" },
+            { VirtualKey.Application, "App" },
+            { VirtualKey.Sleep, "Sleep" },
+            { VirtualKey.NumberPad0, "Num 0" },
+            { VirtualKey.NumberPad1, "Num 1" },
+            { VirtualKey.NumberPad2, "Num 2" },
+            { VirtualKey.NumberPad3, "Num 3" },
+            { VirtualKey.NumberPad4, "Num 4" },
+            { VirtualKey.NumberPad5, "Num 5" },
+            { VirtualKey.NumberPad6, "Num 6" },
+            { VirtualKey.NumberPad7, "Num 7" },
+            { VirtualKey.NumberPad8, "Num 8" },
+            { VirtualKey.NumberPad9, "Num 9" },
+            { VirtualKey.Multiply, "Num *" },
+            { VirtualKey.Add, "Num +" },
+            { VirtualKey.Separator, "Num ," },
+            { VirtualKey.Subtract, "Num -" },
+            { VirtualKey.Decimal, "Num ." },
+            { VirtualKey.Divide, "Num /" },
+            { VirtualKey.F1, "F1" },
+            { VirtualKey.F2, "F2" },
+            { VirtualKey.F3, "F3" },
+            { VirtualKey.F4, "F4" },
+            { VirtualKey.F5, "F5" },
+            { VirtualKey.F6, "F6" },
+            { VirtualKey.F7, "F7" },
+            { VirtualKey.F8, "F8" },
+            { VirtualKey.F9, "F9" },
+            { VirtualKey.F10, "F10" },
+            { VirtualKey.F11, "F11" },
+            { VirtualKey.F12, "F12" },
+            { VirtualKey.F13, "F13" },
+            { VirtualKey.F14, "F14" },
+            { VirtualKey.F15, "F15" },
+            { VirtualKey.F16, "F16" },
+            { VirtualKey.F17, "F17" },
+            { VirtualKey.F18, "F18" },
+            { VirtualKey.F19, "F19" },
+            { VirtualKey.F20, "F20" },
+            { VirtualKey.F21, "F21" },
+            { VirtualKey.F22, "F22" },
+            { VirtualKey.F23, "F23" },
+            { VirtualKey.F24, "F24" },
+            { VirtualKey.NumberKeyLock, "NumLock" },
+            { VirtualKey.Scroll, "Scroll Lock" },
+            { VirtualKey.LeftShift, "Shift" },
+            { VirtualKey.RightShift, "Shift" },
+            { VirtualKey.LeftControl, "Ctrl" },
+            { VirtualKey.RightControl, "Ctrl" },
+            { VirtualKey.LeftMenu, "Alt" },
+            { VirtualKey.RightMenu, "Alt" },
+        };
+
+        /// <summary>Format modifier flags + virtual key as display string (e.g. "Alt + PgUp").</summary>
+        public static string ToDisplayString(uint modifiers, uint vk)
+        {
+            var parts = new List<string>();
+            if ((modifiers & MOD_WIN) != 0) parts.Add("Win");
+            if ((modifiers & MOD_CONTROL) != 0) parts.Add("Ctrl");
+            if ((modifiers & MOD_ALT) != 0) parts.Add("Alt");
+            if ((modifiers & MOD_SHIFT) != 0) parts.Add("Shift");
+            var keyName = GetKeyName((VirtualKey)vk);
+            if (!string.IsNullOrEmpty(keyName))
+                parts.Add(keyName);
+            return parts.Count > 0 ? string.Join(" + ", parts) : "None";
+        }
+
+        public static string GetKeyName(VirtualKey key)
+        {
+            return KeyNames.TryGetValue(key, out var name) ? name : key.ToString();
+        }
+
+        /// <summary>True if the key is typically used only as a modifier (don't use as sole key).</summary>
+        public static bool IsModifierKey(VirtualKey key)
+        {
+            return key == VirtualKey.LeftWindows || key == VirtualKey.RightWindows
+                || key == VirtualKey.Control || key == VirtualKey.LeftControl || key == VirtualKey.RightControl
+                || key == VirtualKey.Menu || key == VirtualKey.LeftMenu || key == VirtualKey.RightMenu
+                || key == VirtualKey.Shift || key == VirtualKey.LeftShift || key == VirtualKey.RightShift;
+        }
+    }
+}

ClipForge/SettingsService.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 using System.Text.Json;
 
@@ -9,7 +9,10 @@ namespace ClipForge
         public int ClipLengthSeconds { get; set; } = 30;
         public int VideoQuality { get; set; } = 70;
         public int Framerate { get; set; } = 60;
-        public string HotkeyDisplay { get; set; } = "Alt + F9";
+        /// <summary>Windows modifier flags: Alt=1, Ctrl=2, Shift=4, Win=8.</summary>
+        public int HotkeyModifiers { get; set; } = 1; // MOD_ALT
+        /// <summary>Windows virtual key code (e.g. VK_F9=0x78, VK_PRIOR=0x21 for PgUp).</summary>
+        public int HotkeyVirtualKey { get; set; } = 0x78; // VK_F9
     }
 
     public class SettingsService