实现窗口自动对齐

admin · 2011-11-21

有很多软件有这么一个功能，当窗口边框贴近屏幕边缘的时候，自动吸附过去。
实现这个功能很简单。搜了一下，然后自己改了一点点，代码更容易懂。

#ifndef __SNAP_WINDOW_H__
#define __SNAP_WINDOW_H__

class CSnapWindow
{
public:
int snap_x;
int snap_y;
public:
CSnapWindow();
void OnWindowPosChanging(LPARAM lParam);
private:
RECT snap_wn;
RECT snap_wa;
};
CSnapWindow::CSnapWindow()
{
//这个你自己设置吧
snap_x = 12;
snap_y = 12;
}
/*
case WM_WINDOWPOSCHANGING:
snapHandler.OnWindowPosChanging(lParam);
break;
*/
void CSnapWindow::OnWindowPosChanging(LPARAM lParam)
{
WINDOWPOS* lpwndpos = (WINDOWPOS *)lParam;

//获得窗口大小，千万别用GetClientRect啊，我就杯具了
GetWindowRect(lpwndpos->hwnd,&snap_wn);
snap_wn.right = snap_wn.right - snap_wn.left;
snap_wn.bottom = snap_wn.bottom - snap_wn.top;

//获得工作区大小，就是除去任务栏以外的区域
SystemParametersInfo( SPI_GETWORKAREA, 0, &snap_wa, 0 );

// Left border
if(lpwndpos->x >= -snap_x + snap_wa.left && lpwndpos->x <= snap_x + snap_wa.left) {
lpwndpos->x = snap_wa.left;
}

// Top border
if(lpwndpos->y >= -snap_y + snap_wa.top && lpwndpos->y <= snap_y + snap_wa.top) {
lpwndpos->y = snap_wa.top;
}

// Right border
if(lpwndpos->x + snap_wn.right <= snap_wa.right + snap_x && lpwndpos->x + snap_wn.right >= snap_wa.right - snap_x) {
lpwndpos->x = snap_wa.right - snap_wn.right;
}

// Bottom border
if( lpwndpos->y + snap_wn.bottom <= snap_wa.bottom + snap_y && lpwndpos->y + snap_wn.bottom >= snap_wa.bottom - snap_y) {
lpwndpos->y = snap_wa.bottom - snap_wn.bottom;
}
}

#endif //__SNAP_WINDOW_H__
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用起来也很简单，在窗口处理函数中，把WM_WINDOWPOSCHANGING消息处理交过来即可。

Phoebe leong · 2012-06-07

Wah, it so great , all were coding..thank you for sharing, actually this one was java coding ..

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实现窗口自动对齐

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实现窗口自动对齐

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