/*
 * Created by SharpDevelop.
 * User: Johannes
 * Date: 11.06.2005
 * Time: 09:50
 */

using System;
using System.Runtime.InteropServices;

namespace CheckMail
{
	/// <summary>
	/// Description of NotifyIcon.
	/// </summary>
	public class NotifyIcon
	{
		[StructLayout(LayoutKind.Sequential)]
		public struct NotifyIconData
		{
			public System.UInt32 cbSize; // DWORD
			public System.IntPtr hWnd; // HWND
			public System.UInt32 uID; // UINT
			public NotifyFlags uFlags; // UINT
			public System.UInt32 uCallbackMessage; // UINT
			public System.IntPtr hIcon; // HICON
			[MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
			public System.String szTip; // char[128]
			public System.UInt32 dwState; // DWORD
			public System.UInt32 dwStateMask; // DWORD
			[MarshalAs(UnmanagedType.ByValTStr, SizeConst=256)]
			public System.String szInfo; // char[256]
			public System.UInt32 uTimeoutOrVersion; // UINT
			[MarshalAs(UnmanagedType.ByValTStr, SizeConst=64)]
			public System.String szInfoTitle; // char[64]
			public System.UInt32 dwInfoFlags; // DWORD
			//GUID guidItem; > IE 6
		}
		
		public enum NotifyCommand {Add = 0, Modify = 1, Delete = 2, SetFocus = 3,
			SetVersion = 4}
		public enum NotifyFlags {Message = 1, Icon = 2, Tip = 4, State = 8, Info = 16,
			Guid = 32}
		
		[DllImport("shell32.Dll")]
		public static extern System.Int32 Shell_NotifyIcon(NotifyCommand cmd,
		                                                   ref NotifyIconData data);
		
		[DllImport("Kernel32.Dll")]
		public static extern System.UInt32 GetCurrentThreadId();
		
		public delegate System.Int32 EnumThreadWndProc(System.IntPtr hWnd,
		                                               System.UInt32 lParam);
		
		[DllImport("user32.Dll")]
		public static extern System.Int32 EnumThreadWindows(System.UInt32 threadId,
		                                                    EnumThreadWndProc callback,
		                                                    System.UInt32 param);
		
		[DllImport("user32.Dll")]
		public static extern System.Int32 GetClassName(System.IntPtr hWnd,
		                                               System.Text.StringBuilder className,
		                                               System.Int32 maxCount);
		
		private System.IntPtr m_notifyWindow;
		private bool m_foundNotifyWindow;
		
		// Win32 Callback Function
		private System.Int32 FindNotifyWindowCallback(System.IntPtr hWnd,
		                                              System.UInt32 lParam)
		{
			System.Text.StringBuilder buffer = new System.Text.StringBuilder(256);
			GetClassName(hWnd, buffer, buffer.Capacity);
			
			// but what if this changes?  - anybody got a better idea?
			if(buffer.ToString() == "WindowsForms10.Window.0.app1")
			{
				m_notifyWindow = hWnd;
				m_foundNotifyWindow = true;
				return 0; // stop searching
			}
			return 1;
		}
		
		public void ShowBalloon(uint iconId, string title, string text, uint timeout)
		{
			// find notify window
			uint threadId = GetCurrentThreadId();
			EnumThreadWndProc cb = new EnumThreadWndProc(FindNotifyWindowCallback);
			m_foundNotifyWindow = false;
			EnumThreadWindows(threadId, cb, 0);
			if(m_foundNotifyWindow)
			{
				// show the balloon
				NotifyIconData data = new NotifyIconData();
				data.cbSize = (System.UInt32)
					System.Runtime.InteropServices.Marshal.SizeOf(
					                                              typeof(NotifyIconData));
				data.hWnd = m_notifyWindow;
				data.uID = iconId;
				data.uFlags = NotifyFlags.Info;
				data.uTimeoutOrVersion = 15000;
				data.szInfo = text;
				data.szInfoTitle = title;
				Shell_NotifyIcon(NotifyCommand.Modify, ref data);
			}
		}
	}
}