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制作 MSN、QQ 的消息提示窗口

制作 MSN、QQ 的消息提示窗口

作者:袁怀善

下载源代码

  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:

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.

以上内容是从MSDN中摘录的,要淡入淡出的效果的话,用到AW_BELND。

三、控制窗口显示的代码 CMainFrame::OnCreate(…) { //... AnimateWindow(GetSafeHwnd(),1000,AW_CENTER|AW_BLEND); //… } 四、 关闭的代码CMainFrame::OnClose(..) { AnimateWindow(GetSafeHwnd(),1000,AW_HIDE|AW_CENTER|AW_BLEND); }   其实AnimateWindow只是利用了windows本身的方法,如果您要更加有个性的窗口效果,那就得多做写些代码了,一分辛苦,一分收获吧
就这写这么多吧,不明白的,一看源码,二查MSDN,三请教高手。

五、结束语

  其实就MSN的提示窗口来说,如果要从使用复杂一点的背景和效果,那么还有刷新屏幕的问题,应做到无闪刷新.由于时间苍促,不足之处必然有之,同时以上代码也参考了一部分以前 VCKBASE 技术文档,在此表示感谢!

如果有问题,欢迎交流!共同进步!

Sambios 2004.9.1

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