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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Text; | ||
| using System.Threading.Tasks; | ||
| using System.Windows.Forms; | ||
|
|
||
| namespace QuickDictionary | ||
| { | ||
| public sealed class KeyboardHook : IDisposable | ||
| { | ||
|
|
||
| /// <summary> | ||
| /// Represents the window that is used internally to get the messages. | ||
| /// </summary> | ||
| private class Window : NativeWindow, IDisposable | ||
| { | ||
| private static int WM_HOTKEY = 0x0312; | ||
|
|
||
| public Window() | ||
| { | ||
| // create the handle for the window. | ||
| this.CreateHandle(new CreateParams()); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Overridden to get the notifications. | ||
| /// </summary> | ||
| /// <param name="m"></param> | ||
| protected override void WndProc(ref Message m) | ||
| { | ||
| base.WndProc(ref m); | ||
|
|
||
| // check if we got a hot key pressed. | ||
| if (m.Msg == WM_HOTKEY) | ||
| { | ||
| // get the keys. | ||
| Keys key = (Keys)(((int)m.LParam >> 16) & 0xFFFF); | ||
| ModifierKeys modifier = (ModifierKeys)((int)m.LParam & 0xFFFF); | ||
|
|
||
| // invoke the event to notify the parent. | ||
| if (KeyPressed != null) | ||
| KeyPressed(this, new KeyPressedEventArgs(modifier, key)); | ||
| } | ||
| } | ||
|
|
||
| public event EventHandler<KeyPressedEventArgs> KeyPressed; | ||
|
|
||
| #region IDisposable Members | ||
|
|
||
| public void Dispose() | ||
| { | ||
| this.DestroyHandle(); | ||
| } | ||
|
|
||
| #endregion | ||
| } | ||
|
|
||
| private Window _window = new Window(); | ||
| private int _currentId; | ||
|
|
||
| public KeyboardHook() | ||
| { | ||
| // register the event of the inner native window. | ||
| _window.KeyPressed += delegate (object sender, KeyPressedEventArgs args) | ||
| { | ||
| if (KeyPressed != null) | ||
| KeyPressed(this, args); | ||
| }; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Registers a hot key in the system. | ||
| /// </summary> | ||
| /// <param name="modifier">The modifiers that are associated with the hot key.</param> | ||
| /// <param name="key">The key itself that is associated with the hot key.</param> | ||
| public void RegisterHotKey(ModifierKeys modifier, Keys key) | ||
| { | ||
| // increment the counter. | ||
| _currentId = _currentId + 1; | ||
|
|
||
| // register the hot key. | ||
| if (!NativeMethods.RegisterHotKey(_window.Handle, _currentId, (uint)modifier, (uint)key)) | ||
| throw new InvalidOperationException("Couldn’t register the hot key."); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// A hot key has been pressed. | ||
| /// </summary> | ||
| public event EventHandler<KeyPressedEventArgs> KeyPressed; | ||
|
|
||
| #region IDisposable Members | ||
|
|
||
| public void Dispose() | ||
| { | ||
| // unregister all the registered hot keys. | ||
| for (int i = _currentId; i > 0; i--) | ||
| { | ||
| NativeMethods.UnregisterHotKey(_window.Handle, i); | ||
| } | ||
|
|
||
| // dispose the inner native window. | ||
| _window.Dispose(); | ||
| } | ||
|
|
||
| #endregion | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Event Args for the event that is fired after the hot key has been pressed. | ||
| /// </summary> | ||
| public class KeyPressedEventArgs : EventArgs | ||
| { | ||
| private ModifierKeys _modifier; | ||
| private Keys _key; | ||
|
|
||
| internal KeyPressedEventArgs(ModifierKeys modifier, Keys key) | ||
| { | ||
| _modifier = modifier; | ||
| _key = key; | ||
| } | ||
|
|
||
| public ModifierKeys Modifier | ||
| { | ||
| get { return _modifier; } | ||
| } | ||
|
|
||
| public Keys Key | ||
| { | ||
| get { return _key; } | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// The enumeration of possible modifiers. | ||
| /// </summary> | ||
| [Flags] | ||
| public enum ModifierKeys : uint | ||
| { | ||
| Alt = 1, | ||
| Control = 2, | ||
| Shift = 4, | ||
| Win = 8 | ||
| } | ||
| } |
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