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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:)
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. |
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!
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