The Favalias Application

using System;
using System.ComponentModel;
using System.Collections;
using System.Diagnostics;
using System.Windows.Forms;
using Favalias.SystemHotkeyNS.Win32;

namespace Favalias.SystemHotkeyNS
{
	/// <summary>
	/// Handles a System Hotkey
	/// </summary>
	public class SystemHotkey : System.ComponentModel.Component,IDisposable
	{
		private System.ComponentModel.Container components = null;
		protected DummyWindowWithEvent m_Window=new DummyWindowWithEvent();	//window for WM_Hotkey Messages
		protected Shortcut m_HotKey=Shortcut.None;
		protected Keys _mod;
		protected Keys _key;
		protected bool isRegistered=false;
		public event System.EventHandler Pressed;
		public event System.EventHandler Error;


		public SystemHotkey(System.ComponentModel.IContainer container)
		{
			container.Add(this);
			InitializeComponent();
			m_Window.ProcessMessage+=new MessageEventHandler(MessageEvent);
		}

		public SystemHotkey()
		{
			InitializeComponent();
			if (!DesignMode)
			{
				m_Window.ProcessMessage+=new MessageEventHandler(MessageEvent);
			}
		}

		public new void Dispose()
		{
			if (isRegistered)
			{
				if (UnregisterHotkey())
					System.Diagnostics.Debug.WriteLine("Unreg: OK");
			}
		}
		#region Component Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			components = new System.ComponentModel.Container();
		}
		#endregion

		protected void MessageEvent(object sender,ref Message m,ref bool Handled)
		{	//Handle WM_Hotkey event
			if ((m.Msg==(int)Msgs.WM_HOTKEY)&&(m.WParam==(IntPtr)this.GetType().GetHashCode()))
			{
				Handled=true;
				//System.Diagnostics.Debug.WriteLine("HOTKEY pressed!");
				if (Pressed!=null) Pressed(this,EventArgs.Empty);
			}
		}
	
		protected bool UnregisterHotkey()
		{	//unregister hotkey
			return User32.UnregisterHotKey(m_Window.Handle,this.GetType().GetHashCode());
		}

		protected bool RegisterHotkey(Shortcut key)
		{	//register hotkey
			int mod=0;
			Keys k2=Keys.None;
			if (((int)key & (int)Keys.Alt)==(int)Keys.Alt) {mod+=(int)Modifiers.MOD_ALT;k2=Keys.Alt;}
			if (((int)key & (int)Keys.Shift)==(int)Keys.Shift) {mod+=(int)Modifiers.MOD_SHIFT;k2=Keys.Shift;}
			if (((int)key & (int)Keys.Control)==(int)Keys.Control) {mod+=(int)Modifiers.MOD_CONTROL;k2=Keys.Control;}
			if (((int)key & (int)Keys.LWin)==(int)Keys.LWin) {mod+=(int)Modifiers.MOD_WIN;k2=Keys.LWin;}
			
			System.Diagnostics.Debug.Write(mod.ToString()+" ");
			System.Diagnostics.Debug.WriteLine((((int)key)-((int)k2)).ToString());

			return User32.RegisterHotKey(m_Window.Handle,this.GetType().GetHashCode(),(int)mod,((int)key)-((int)k2));
		}

		protected bool RegisterHotkey(Keys mod, Keys key)
		{	
			int modif = 0;
			if(((int)mod & (int)Keys.Alt) == (int)Keys.Alt) 
				modif += (int)Modifiers.MOD_ALT;
			if(((int)mod & (int)Keys.Shift) == (int)Keys.Shift) 
				modif += (int)Modifiers.MOD_SHIFT;
			if(((int)mod & (int)Keys.Control) == (int)Keys.Control) 
				modif += (int)Modifiers.MOD_CONTROL;
			if(((int)mod & (int)Keys.LWin) == (int)Keys.LWin) 
				modif += (int)Modifiers.MOD_WIN;

			System.Diagnostics.Debug.Write(((int)modif).ToString()+" ");
			System.Diagnostics.Debug.Write(((int)key).ToString()+" ");
			return User32.RegisterHotKey(m_Window.Handle,this.GetType().GetHashCode(),(int)modif, (int)key);
		}

		public bool IsRegistered
		{
			get{return isRegistered;}
		}

		public bool SetShortcut(Keys mod, Keys key)
		{
			if (DesignMode) {_mod=mod;_key=key;return false;}	//Don't register in Designmode
			if (isRegistered)	//Unregister previous registered Hotkey
			{
				if (UnregisterHotkey())
				{
					System.Diagnostics.Debug.WriteLine("Unreg hotkey: OK");
					isRegistered=false;
				}
				else 
				{
					if (Error!=null) Error(this,EventArgs.Empty);
					System.Diagnostics.Debug.WriteLine("Unreg hotkey: ERR");
				}
			}
			bool @return = false;
			//if (value==Shortcut.None) {m_HotKey=value;return;}
			if (RegisterHotkey(mod, key))	//Register new Hotkey
			{
				System.Diagnostics.Debug.WriteLine("Reg hotkey: OK");
				isRegistered=true;
				@return = true;
			}
			else 
			{
				if (Error!=null) Error(this,EventArgs.Empty);
				System.Diagnostics.Debug.WriteLine("Reg hotkey: ERR");
			}
			_mod = mod;
			_key = key;
			return @return;
		}

		[DefaultValue(Shortcut.None)]
		public Shortcut Shortcut
		{
			get { return m_HotKey; }
			set 
			{ 
				if (DesignMode) {m_HotKey=value;return;}	//Don't register in Designmode
				if ((isRegistered)&&(m_HotKey!=value))	//Unregister previous registered Hotkey
				{
					if (UnregisterHotkey())
					{
						System.Diagnostics.Debug.WriteLine("Unreg hotkey: OK");
						isRegistered=false;
					}
					else 
					{
						if (Error!=null) Error(this,EventArgs.Empty);
						System.Diagnostics.Debug.WriteLine("Unreg hotkey: ERR");
					}
				}
				if (value==Shortcut.None) {m_HotKey=value;return;}
				if (RegisterHotkey(value))	//Register new Hotkey
				{
					System.Diagnostics.Debug.WriteLine("Reg hotkey: OK");
					isRegistered=true;
				}
				else 
				{
					if (Error!=null) Error(this,EventArgs.Empty);
					System.Diagnostics.Debug.WriteLine("Reg hotkey: ERR");
				}
				m_HotKey=value;
			}
		}
	}
}