100 lines
3.5 KiB
C#
100 lines
3.5 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using System.Threading;
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using System.Windows.Forms;
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namespace DD2Switcher {
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public static class HotKeyManager {
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private static volatile MessageWindow _wnd;
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private static volatile IntPtr _hwnd;
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private static readonly ManualResetEvent _windowReadyEvent = new(false);
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private static int _id;
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static HotKeyManager() {
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var messageLoop = new Thread(delegate() { Application.Run(new MessageWindow()); });
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messageLoop.Name = "MessageLoopThread";
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messageLoop.IsBackground = true;
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messageLoop.Start();
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}
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public static event EventHandler<HotKeyEventArgs> HotKeyPressed;
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public static int RegisterHotKey(Keys key, KeyModifiers modifiers) {
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_windowReadyEvent.WaitOne();
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var id = Interlocked.Increment(ref _id);
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_wnd.Invoke(new RegisterHotKeyDelegate(RegisterHotKeyInternal), _hwnd, id, (uint)modifiers, (uint)key);
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return id;
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}
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public static void UnregisterHotKey(int id) {
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_wnd.Invoke(new UnRegisterHotKeyDelegate(UnRegisterHotKeyInternal), _hwnd, id);
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}
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private static void RegisterHotKeyInternal(IntPtr hwnd, int id, uint modifiers, uint key) {
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RegisterHotKey(hwnd, id, modifiers, key);
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}
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private static void UnRegisterHotKeyInternal(IntPtr hwnd, int id) {
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UnregisterHotKey(_hwnd, id);
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}
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private static void OnHotKeyPressed(HotKeyEventArgs e) {
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if (HotKeyPressed != null)
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HotKeyPressed(null, e);
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}
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[DllImport("user32", SetLastError = true)]
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private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
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[DllImport("user32", SetLastError = true)]
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private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
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private delegate void RegisterHotKeyDelegate(IntPtr hwnd, int id, uint modifiers, uint key);
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private delegate void UnRegisterHotKeyDelegate(IntPtr hwnd, int id);
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private class MessageWindow : Form {
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private const int WM_HOTKEY = 0x312;
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public MessageWindow() {
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_wnd = this;
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_hwnd = Handle;
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_windowReadyEvent.Set();
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}
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protected override void WndProc(ref Message m) {
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if (m.Msg == WM_HOTKEY) {
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var e = new HotKeyEventArgs(m.LParam);
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OnHotKeyPressed(e);
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}
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base.WndProc(ref m);
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}
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protected override void SetVisibleCore(bool value) {
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// Ensure the window never becomes visible
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base.SetVisibleCore(false);
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}
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}
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}
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public class HotKeyEventArgs : EventArgs {
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public readonly Keys Key;
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public readonly KeyModifiers Modifiers;
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public HotKeyEventArgs(Keys key, KeyModifiers modifiers) {
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Key = key;
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Modifiers = modifiers;
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}
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public HotKeyEventArgs(IntPtr hotKeyParam) {
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var param = (uint)hotKeyParam.ToInt64();
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Key = (Keys)((param & 0xffff0000) >> 16);
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Modifiers = (KeyModifiers)(param & 0x0000ffff);
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}
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}
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[Flags]
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public enum KeyModifiers { Alt = 1, Control = 2, Shift = 4, Windows = 8, NoRepeat = 0x4000 }
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} |