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81 lines
2.6 KiB
C#
81 lines
2.6 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using System.Runtime.InteropServices;
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namespace osu.Desktop.Windows
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{
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internal class WindowsKey
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{
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private delegate int LowLevelKeyboardProcDelegate(int nCode, int wParam, ref KdDllHookStruct lParam);
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private static bool isBlocked;
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private const int wh_keyboard_ll = 13;
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private const int wm_keydown = 256;
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private const int wm_syskeyup = 261;
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//Resharper disable once NotAccessedField.Local
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private static LowLevelKeyboardProcDelegate keyboardHookDelegate; // keeping a reference alive for the GC
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private static IntPtr keyHook;
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[StructLayout(LayoutKind.Explicit)]
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private readonly struct KdDllHookStruct
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{
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[FieldOffset(0)]
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public readonly int VkCode;
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[FieldOffset(8)]
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public readonly int Flags;
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}
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private static int lowLevelKeyboardProc(int nCode, int wParam, ref KdDllHookStruct lParam)
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{
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if (wParam >= wm_keydown && wParam <= wm_syskeyup)
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{
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switch (lParam.VkCode)
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{
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case 0x5B: // left windows key
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case 0x5C: // right windows key
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return 1;
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}
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}
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return callNextHookEx(0, nCode, wParam, ref lParam);
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}
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internal static void Disable()
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{
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if (keyHook != IntPtr.Zero || isBlocked)
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return;
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keyHook = setWindowsHookEx(wh_keyboard_ll, (keyboardHookDelegate = lowLevelKeyboardProc), Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]), 0);
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isBlocked = true;
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}
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internal static void Enable()
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{
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if (keyHook == IntPtr.Zero || !isBlocked)
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return;
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keyHook = unhookWindowsHookEx(keyHook);
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keyboardHookDelegate = null;
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keyHook = IntPtr.Zero;
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isBlocked = false;
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}
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[DllImport(@"user32.dll", EntryPoint = @"SetWindowsHookExA")]
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private static extern IntPtr setWindowsHookEx(int idHook, LowLevelKeyboardProcDelegate lpfn, IntPtr hMod, int dwThreadId);
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[DllImport(@"user32.dll", EntryPoint = @"UnhookWindowsHookEx")]
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private static extern IntPtr unhookWindowsHookEx(IntPtr hHook);
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[DllImport(@"user32.dll", EntryPoint = @"CallNextHookEx")]
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private static extern int callNextHookEx(int hHook, int nCode, int wParam, ref KdDllHookStruct lParam);
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}
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}
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