Zzz – Rev 1

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using System;

namespace Zzz.Idle
{
    public class KeyboardInput : IDisposable
    {
        #region Static Fields and Constants

        private const int WhKeyboardLl = 13;

        #endregion

        #region Public Events & Delegates

        public event EventHandler<EventArgs> KeyboardKeyPressed;

        #endregion

        #region Private Delegates, Events, Enums, Properties, Indexers and Fields

        private readonly WindowsHookHelper.HookDelegate _keyboardDelegate;

        private readonly IntPtr _keyBoardHandle;

        private bool _disposed;

        #endregion

        #region Constructors, Destructors and Finalizers

        public KeyboardInput()
        {
            _keyboardDelegate = KeyboardHookDelegate;
            _keyBoardHandle = WindowsHookHelper.SetWindowsHookEx(
                WhKeyboardLl, _keyboardDelegate, IntPtr.Zero, 0);
        }

        public void Dispose()
        {
            Dispose(true);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!_disposed)
            {
                if (_keyBoardHandle != IntPtr.Zero)
                {
                    WindowsHookHelper.UnhookWindowsHookEx(_keyBoardHandle);
                }

                _disposed = true;
            }
        }

        ~KeyboardInput()
        {
            Dispose(false);
        }

        #endregion

        #region Private Methods

        private IntPtr KeyboardHookDelegate(int code, IntPtr wParam, IntPtr lParam)
        {
            if (code < 0)
            {
                return WindowsHookHelper.CallNextHookEx(_keyBoardHandle, code, wParam, lParam);
            }

            KeyboardKeyPressed?.BeginInvoke(this, EventArgs.Empty, ar => { }, null);

            return WindowsHookHelper.CallNextHookEx(_keyBoardHandle, code, wParam, lParam);
        }

        #endregion
    }
}

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