clipforge/ClipForge/GlobalHotkeyService.cs

using System;
using System.Runtime.InteropServices;
using Microsoft.UI.Xaml;

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;

        // 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;

        public void Initialize(IntPtr hwnd)
        {
            _hwnd = hwnd;
            RegisterHotKey(_hwnd, HOTKEY_CLIP, MOD_ALT, VK_F9);
        }

        public void ProcessHotkey(int id)
        {
            if (id == HOTKEY_CLIP)
            {
                ClipRequested?.Invoke();
            }
        }

        public void Cleanup()
        {
            UnregisterHotKey(_hwnd, HOTKEY_CLIP);
        }
    }
}