制作 MSN、QQ 的消息提示窗口

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　　用过QQ和MSN聊天工具的人都知道，只要好友上线，就会在托盘的位置处显示一个提示窗口，
可以是拉帘式的，或者是淡入淡出的形式出现；想想何不为自己的程式也加一个漂亮的提示窗口呢:)
说做就做。

一、MSN拉帘式窗口制作

分三部分：1、窗口的显示；2、窗口的停留；3、窗口的消失；
如果达到这样郊果，系统中要有三个定时器，进行分别控制。定义的定时器如下：

#define ID_TIMER_POP_WINDOW 1

#define ID_TIMER_DISPALY_DELAY 2 

#define ID_TIMER_CLOSE_WINDOW 3 

　　从CWnd 继承一个窗口,当然也可以从CFrameWnd进行派生,这不是主要问题，关键是看你是怎么处理WM_PAINT,WM_MOUSEMOVE,WM_TIMER的消息。一般情况，我从OnPaint()中进行显示图片，在WM_TIMER中处理定时器消息，下面是处里定时器时用到的代码：

CMsgWnd::CMsgWnd()

{ 

	...

	SetTimer(ID_TIEMR_POP_WINDOW,20,NULL);

	...

} 



void CMsgWnd::OnTimer(UINT nIDEvent) 

{ 

	static int nHeight=0;

	int cy=GetSystemMetrics(SM_CYSCREEN);

	int cx=GetSystemMetrics(SM_CXSCREEN);

	RECT rect;

	SystemParametersInfo(SPI_GETWORKAREA,0,&rect,0);

	int y=rect.bottom-rect.top;

	int x=rect.right-rect.left;

	x=x-WIN_WIDTH;

	

	switch(nIDEvent)

	{

	case ID_TIMER_POP_WINDOW:

		if(nHeight<=WIN_HEIGHT)

		{

			  nHeight; 

			MoveWindow(x,

				y-nHeight,

				WIN_WIDTH,

				WIN_HEIGHT);

			

			Invalidate(FALSE);

		}

		else

		{

			KillTimer(ID_TIMER_POP_WINDOW);

			SetTimer(ID_TIMER_DISPLAY_DELAY,5000,NULL);

		}

		break;

	case ID_TIMER_CLOSE_WINDOW:

		if(nHeight>=0)

		{

			nHeight--;

			MoveWindow(x,

				y-nHeight,

				WIN_WIDTH,

				nHeight);

		}

		else

		{

			KillTimer(ID_TIMER_CLOSE_WINDOW);

			SendMessage(WM_CLOSE);

		}

		break;

	case ID_TIMER_DISPLAY_DELAY:

		KillTimer(ID_TIMER_DISPLAY_DELAY);

		SetTimer(ID_TIMER_CLOSE_WINDOW,20,NULL);

		break;

	}

	

	CWnd::OnTimer(nIDEvent);

}            

根据你设的定时器的长短来控制窗口的显示过程；

二、QQ淡出淡出显示实现

　　其实用到一个API函数：AnimateWindow,下面是这个函数的一些说明：

The AnimateWindow function enables you to produce special effects when showing or hiding windows.

There are two types of animation: roll animation and slide animation. 

BOOL AnimateWindow(

		 HWND hwnd, // handle to the window to animate

		 DWORD dwTime, // duration of animation

		 DWORD dwFlags // animation type

		 );

上面的函数前两个参数一看就明白，不用说了，最后一个参数dwFlags设置动画窗口的样式：

Specifies the type of animation. This parameter can be one or more of the following flags.

各种标志说明：

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标志	说明
AW_SLIDE	Uses slide animation. By default, roll animation is used. This flag is ignored when used with the AW_CENTER flag.
AW_ACTIVATE	Activates the window. Do not use this flag with AW_HIDE.
AW_BLEND	Uses a fade effect. This flag can be used only if hwnd is a top-level window.
AW_HIDE	Hides the window. By default, the window is shown.
AW_CENTER	Makes the window appear to collapse inward if the AW_HIDE flag is used or expand outward if the AW_HIDE flag is not used.
AW_HOR_POSITIVE	Animate the window from left to right. This flag can be used with roll or slide animation. It is ignored when used with the AW_CENTER flag.
AW_HOR_NEGATIVE	Animate the window from right to left. This flag can be used with roll or slide animation. It is ignored when used with the AW_CENTER flag.
AW_VER_POSITIVE	Animate the window from top to bottom. This flag can be used with roll or slide animation. It is ignored when used with the AW_CENTER flag.
AW_VER_NEGATIVE	Animate the window from bottom to top. This flag can be used with roll or slide animation. It is ignored when used with the AW_CENTER flag.

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