mirror of
https://github.com/Hofknecht/SystemTrayMenu.git
synced 2024-06-03 02:55:17 +12:00
141 lines
4.1 KiB
C#
141 lines
4.1 KiB
C#
using System;
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using System.Windows.Forms;
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namespace SystemTrayMenu.Helper
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{
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public sealed class KeyboardHook : IDisposable
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{
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/// <summary>
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/// Represents the window that is used internally to get the messages.
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/// </summary>
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private class Window : NativeWindow, IDisposable
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{
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private static readonly int WM_HOTKEY = 0x0312;
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public Window()
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{
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// create the handle for the window.
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CreateHandle(new CreateParams());
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}
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/// <summary>
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/// Overridden to get the notifications.
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/// </summary>
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/// <param name="m"></param>
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protected override void WndProc(ref Message m)
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{
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base.WndProc(ref m);
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// check if we got a hot key pressed.
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if (m.Msg == WM_HOTKEY)
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{
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// get the keys.
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Keys key = (Keys)(((int)m.LParam >> 16) & 0xFFFF);
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KeyboardHookModifierKeys modifier = (KeyboardHookModifierKeys)((int)m.LParam & 0xFFFF);
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// invoke the event to notify the parent.
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if (KeyPressed != null)
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{
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KeyPressed(this, new KeyPressedEventArgs(modifier, key));
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}
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}
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}
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public event EventHandler<KeyPressedEventArgs> KeyPressed;
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#region IDisposable Members
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public void Dispose()
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{
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DestroyHandle();
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}
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#endregion
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}
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private readonly Window _window = new Window();
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private int _currentId;
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public KeyboardHook()
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{
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// register the event of the inner native window.
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_window.KeyPressed += delegate (object sender, KeyPressedEventArgs args)
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{
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if (KeyPressed != null)
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{
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KeyPressed(this, args);
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}
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};
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}
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/// <summary>
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/// Registers a hot key in the system.
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/// </summary>
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/// <param name="modifier">The modifiers that are associated with the hot key.</param>
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/// <param name="key">The key itself that is associated with the hot key.</param>
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public void RegisterHotKey(KeyboardHookModifierKeys modifier, Keys key)
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{
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// increment the counter.
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_currentId = _currentId + 1;
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// register the hot key.
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if (!NativeMethods.NativeMethods.User32RegisterHotKey(_window.Handle, _currentId, (uint)modifier, (uint)key))
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{
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throw new InvalidOperationException("Couldn’t register the hot key.");
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}
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}
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/// <summary>
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/// A hot key has been pressed.
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/// </summary>
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public event EventHandler<KeyPressedEventArgs> KeyPressed;
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#region IDisposable Members
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public void Dispose()
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{
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// unregister all the registered hot keys.
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for (int i = _currentId; i > 0; i--)
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{
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NativeMethods.NativeMethods.User32UnregisterHotKey(_window.Handle, i);
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}
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// dispose the inner native window.
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_window.Dispose();
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}
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#endregion
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}
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/// <summary>
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/// Event Args for the event that is fired after the hot key has been pressed.
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/// </summary>
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public class KeyPressedEventArgs : EventArgs
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{
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private readonly KeyboardHookModifierKeys _modifier;
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private readonly Keys _key;
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internal KeyPressedEventArgs(KeyboardHookModifierKeys modifier, Keys key)
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{
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_modifier = modifier;
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_key = key;
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}
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public KeyboardHookModifierKeys Modifier => _modifier;
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public Keys Key => _key;
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}
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/// <summary>
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/// The enumeration of possible modifiers.
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/// </summary>
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[Flags]
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public enum KeyboardHookModifierKeys : uint
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{
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Alt = 1,
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Control = 2,
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Shift = 4,
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Win = 8
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}
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}
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