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：
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：
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
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！