Added KeyboardHook class to HelpersLib

ShareX.HelpersLib/Input/KeyboardHook.cs

@@ -0,0 +1,123 @@
+#region License Information (GPL v3)
+
+/*
+    Copyright (c) Jaex
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License
+    as published by the Free Software Foundation; either version 2
+    of the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
+*/
+
+#endregion License Information (GPL v3)
+
+using System;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace ShareX.HelpersLib
+{
+    public class KeyboardHook : IDisposable
+    {
+        public event KeyEventHandler KeyDown, KeyUp;
+
+        private HookProc keyboardHookProc;
+        private IntPtr keyboardHookHandle = IntPtr.Zero;
+
+        public KeyboardHook()
+        {
+            keyboardHookProc = KeyboardHookProc;
+            keyboardHookHandle = SetHook(NativeConstants.WH_KEYBOARD_LL, keyboardHookProc);
+        }
+
+        ~KeyboardHook()
+        {
+            Dispose();
+        }
+
+        private static IntPtr SetHook(int hookType, HookProc hookProc)
+        {
+            using (Process currentProcess = Process.GetCurrentProcess())
+            using (ProcessModule currentModule = currentProcess.MainModule)
+            {
+                return NativeMethods.SetWindowsHookEx(hookType, hookProc, NativeMethods.GetModuleHandle(currentModule.ModuleName), 0);
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private IntPtr KeyboardHookProc(int nCode, IntPtr wParam, IntPtr lParam)
+        {
+            if (nCode >= 0)
+            {
+                bool handled = false;
+
+                switch ((KeyEvent)wParam)
+                {
+                    case KeyEvent.WM_KEYDOWN:
+                    case KeyEvent.WM_SYSKEYDOWN:
+                        handled = OnKeyDown(lParam);
+                        break;
+                    case KeyEvent.WM_KEYUP:
+                    case KeyEvent.WM_SYSKEYUP:
+                        handled = OnKeyUp(lParam);
+                        break;
+                }
+
+                if (handled)
+                {
+                    return keyboardHookHandle;
+                }
+            }
+
+            return NativeMethods.CallNextHookEx(keyboardHookHandle, nCode, wParam, lParam);
+        }
+
+        private bool OnKeyDown(IntPtr key)
+        {
+            if (KeyDown != null)
+            {
+                KeyEventArgs keyEventArgs = GetKeyEventArgs(key);
+                KeyDown(this, keyEventArgs);
+                return keyEventArgs.Handled || keyEventArgs.SuppressKeyPress;
+            }
+
+            return false;
+        }
+
+        private bool OnKeyUp(IntPtr key)
+        {
+            if (KeyUp != null)
+            {
+                KeyEventArgs keyEventArgs = GetKeyEventArgs(key);
+                KeyUp(this, keyEventArgs);
+                return keyEventArgs.Handled || keyEventArgs.SuppressKeyPress;
+            }
+
+            return false;
+        }
+
+        private KeyEventArgs GetKeyEventArgs(IntPtr key)
+        {
+            Keys keyData = (Keys)Marshal.ReadInt32(key) | Control.ModifierKeys;
+            return new KeyEventArgs(keyData);
+        }
+
+        public void Dispose()
+        {
+            NativeMethods.UnhookWindowsHookEx(keyboardHookHandle);
+        }
+    }
+}

ShareX.HelpersLib/ShareX.HelpersLib.csproj

@@ -84,6 +84,7 @@
     <Compile Include="Controls\ToolStripEx.cs">
       <SubType>Component</SubType>
     </Compile>
+    <Compile Include="Input\KeyboardHook.cs" />
     <Compile Include="NameParser\CodeMenuEntryActions.cs" />
     <Compile Include="ClipboardFormat.cs" />
     <Compile Include="NameParser\CodeMenu.cs" />