96 lines
4.3 KiB
C#
96 lines
4.3 KiB
C#
using System.Runtime.InteropServices;
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namespace Lumi.Companion.Overlay;
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public sealed class GlobalHotkeyManager : IDisposable
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{
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private const uint WmHotkey = 0x0312;
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private const uint WmQuit = 0x0012;
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private readonly Dictionary<int, Action> _actions = [];
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private readonly ManualResetEventSlim _ready = new();
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private readonly Thread _thread;
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private IntPtr _window;
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private uint _threadId;
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private int _nextId = 0x4C00;
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public GlobalHotkeyManager()
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{
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_thread = new Thread(MessageLoop) { IsBackground = true, Name = "Lumi Overlay hotkeys" };
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_thread.Start();
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_ready.Wait(TimeSpan.FromSeconds(3));
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}
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public bool Register(string chord, Action action)
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{
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if (!TryParse(chord, out var modifiers, out var key) || _window == IntPtr.Zero) return false;
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var id = Interlocked.Increment(ref _nextId);
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if (!RegisterHotKey(_window, id, modifiers | 0x4000, key)) return false;
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lock (_actions) _actions[id] = action;
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return true;
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}
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public void Clear()
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{
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lock (_actions)
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{
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foreach (var id in _actions.Keys) UnregisterHotKey(_window, id);
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_actions.Clear();
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}
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}
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private void MessageLoop()
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{
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_threadId = GetCurrentThreadId();
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_window = CreateWindowEx(0, "STATIC", "LumiOverlayHotkeys", 0, 0, 0, 0, 0, new IntPtr(-3), IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
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_ready.Set();
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while (GetMessage(out var message, IntPtr.Zero, 0, 0) > 0)
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{
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if (message.message == WmHotkey)
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{
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Action? action;
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lock (_actions) _actions.TryGetValue(message.wParam.ToInt32(), out action);
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try { action?.Invoke(); } catch { }
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}
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TranslateMessage(ref message);
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DispatchMessage(ref message);
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}
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}
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private static bool TryParse(string chord, out uint modifiers, out uint key)
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{
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modifiers = 0;
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key = 0;
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var parts = (chord ?? string.Empty).Split('+', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
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foreach (var part in parts)
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{
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if (part.Equals("Ctrl", StringComparison.OrdinalIgnoreCase)) modifiers |= 0x0002;
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else if (part.Equals("Alt", StringComparison.OrdinalIgnoreCase)) modifiers |= 0x0001;
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else if (part.Equals("Shift", StringComparison.OrdinalIgnoreCase)) modifiers |= 0x0004;
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else if (part.Equals("Win", StringComparison.OrdinalIgnoreCase)) modifiers |= 0x0008;
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else if (part.Length == 1 && char.IsAsciiLetterOrDigit(part[0])) key = char.ToUpperInvariant(part[0]);
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else if (part.StartsWith('F') && int.TryParse(part[1..], out var function) && function is >= 1 and <= 24) key = (uint)(0x70 + function - 1);
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else return false;
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}
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return key != 0;
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}
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public void Dispose()
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{
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Clear();
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if (_threadId != 0) PostThreadMessage(_threadId, WmQuit, IntPtr.Zero, IntPtr.Zero);
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_thread.Join(TimeSpan.FromSeconds(1));
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_ready.Dispose();
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}
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[StructLayout(LayoutKind.Sequential)]
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private struct Msg { public IntPtr hwnd; public uint message; public IntPtr wParam; public IntPtr lParam; public uint time; public int x; public int y; }
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[DllImport("user32.dll", SetLastError = true)] private static extern bool RegisterHotKey(IntPtr hwnd, int id, uint modifiers, uint key);
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[DllImport("user32.dll", SetLastError = true)] private static extern bool UnregisterHotKey(IntPtr hwnd, int id);
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[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)] private static extern IntPtr CreateWindowEx(uint exStyle, string className, string windowName, uint style, int x, int y, int width, int height, IntPtr parent, IntPtr menu, IntPtr instance, IntPtr parameter);
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[DllImport("user32.dll")] private static extern int GetMessage(out Msg message, IntPtr hwnd, uint min, uint max);
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[DllImport("user32.dll")] private static extern bool TranslateMessage(ref Msg message);
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[DllImport("user32.dll")] private static extern IntPtr DispatchMessage(ref Msg message);
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[DllImport("kernel32.dll")] private static extern uint GetCurrentThreadId();
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[DllImport("user32.dll")] private static extern bool PostThreadMessage(uint threadId, uint message, IntPtr wParam, IntPtr lParam);
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}
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