add KeyboardHook

src/Shared/HandyControl_Shared/Tools/Hook/KeyboardHook.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using HandyControl.Data;
+using HandyControl.Tools.Interop;
+
+namespace HandyControl.Tools
+{
+    internal class KeyboardHook
+    {
+        public static event EventHandler<KeyboardHookEventArgs> KeyDown;
+
+        public static event EventHandler<KeyboardHookEventArgs> KeyUp;
+
+        private static IntPtr HookId = IntPtr.Zero;
+
+        private static readonly UnsafeNativeMethods.HookProc Proc = HookCallback;
+
+        public static void Start() => HookId = SetHook(Proc);
+
+        public static void Stop() => UnsafeNativeMethods.UnhookWindowsHookEx(HookId);
+
+        private static IntPtr SetHook(UnsafeNativeMethods.HookProc proc)
+        {
+            using (var curProcess = Process.GetCurrentProcess())
+            using (var curModule = curProcess.MainModule)
+            {
+                if (curModule != null)
+                {
+                    return UnsafeNativeMethods.SetWindowsHookEx((int)UnsafeNativeMethods.HookType.WH_KEYBOARD_LL, proc,
+                        UnsafeNativeMethods.GetModuleHandle(curModule.ModuleName), 0);
+                }
+                return IntPtr.Zero;
+            }
+        }
+
+        private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
+        {
+            if (nCode >= 0)
+            {
+                if (wParam == (IntPtr)NativeMethods.WM_KEYDOWN)
+                {
+                    var virtualKey = Marshal.ReadInt32(lParam);
+
+                    KeyDown?.Invoke(null, new KeyboardHookEventArgs(virtualKey));
+                }
+                else if (wParam == (IntPtr)NativeMethods.WM_KEYUP)
+                {
+                    var virtualKey = Marshal.ReadInt32(lParam);
+
+                    KeyUp?.Invoke(null, new KeyboardHookEventArgs(virtualKey));
+                }
+            }
+            return UnsafeNativeMethods.CallNextHookEx(HookId, nCode, wParam, lParam);
+        }
+    }
+}