PowerToys/Wox.Infrastructure/GlobalHotkey.cs
2014-03-18 17:26:09 +01:00

94 lines
3.0 KiB
C#

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using Wox.Plugin;
namespace Wox.Infrastructure
{
/// <summary>
/// Listens keyboard globally.
/// <remarks>Uses WH_KEYBOARD_LL.</remarks>
/// </summary>
public class GlobalHotkey : IDisposable
{
private InterceptKeys.LowLevelKeyboardProc hookedLowLevelKeyboardProc;
private IntPtr hookId = IntPtr.Zero;
public delegate bool KeyboardCallback(KeyEvent keyEvent, int vkCode, SpecialKeyState state);
public event KeyboardCallback hookedKeyboardCallback;
//Modifier key constants
private const int VK_SHIFT = 0x10;
private const int VK_CONTROL = 0x11;
private const int VK_ALT = 0x12;
private const int VK_WIN = 91;
public GlobalHotkey()
{
// We have to store the LowLevelKeyboardProc, so that it is not garbage collected runtime
hookedLowLevelKeyboardProc = LowLevelKeyboardProc;
// Set the hook
hookId = InterceptKeys.SetHook(hookedLowLevelKeyboardProc);
}
public SpecialKeyState CheckModifiers()
{
SpecialKeyState state = new SpecialKeyState();
if ((InterceptKeys.GetKeyState(VK_SHIFT) & 0x8000) != 0)
{
//SHIFT is pressed
state.ShiftPressed = true;
}
if ((InterceptKeys.GetKeyState(VK_CONTROL) & 0x8000) != 0)
{
//CONTROL is pressed
state.CtrlPressed = true;
}
if ((InterceptKeys.GetKeyState(VK_ALT) & 0x8000) != 0)
{
//ALT is pressed
state.AltPressed = true;
}
if ((InterceptKeys.GetKeyState(VK_WIN) & 0x8000) != 0)
{
//ALT is pressed
state.WinPressed = true;
}
return state;
}
[MethodImpl(MethodImplOptions.NoInlining)]
private IntPtr LowLevelKeyboardProc(int nCode, UIntPtr wParam, IntPtr lParam)
{
bool continues = true;
if (nCode >= 0)
{
if (wParam.ToUInt32() == (int)KeyEvent.WM_KEYDOWN ||
wParam.ToUInt32() == (int)KeyEvent.WM_KEYUP ||
wParam.ToUInt32() == (int)KeyEvent.WM_SYSKEYDOWN ||
wParam.ToUInt32() == (int)KeyEvent.WM_SYSKEYUP)
{
if (hookedKeyboardCallback != null)
continues = hookedKeyboardCallback((KeyEvent)wParam.ToUInt32(), Marshal.ReadInt32(lParam), CheckModifiers());
}
}
if (continues)
{
return InterceptKeys.CallNextHookEx(hookId, nCode, wParam, lParam);
}
return (IntPtr)1;
}
~GlobalHotkey()
{
Dispose();
}
public void Dispose()
{
InterceptKeys.UnhookWindowsHookEx(hookId);
}
}
}