QT中异形窗口的绘制(winEvent处理WM_NCHITTEST消息)

    在QT中绘制异形窗口,只要设定 windowFlag 为 CustomizeWindowHint,再结合setMask()就可以做出各种奇形怪状的窗口。相对来说比较麻烦的, 是进行窗口拖动和缩放的处理。
      在 Windows SDK 和 MFC 中比较容易,只要处理 WM_NCHITTEST,返回相应的测试值就可以了。幸运的是,QT中也提供了直接处理各平台消息的方法,在 Windows下只需要重载winEvent方法。

// include <windows.h>

bool MyDialog::winEvent(MSG* msg, long* result)
{
    const int captionHeight = 25;
    const int frameWidth = 6;
    
    if (msg->message != WM_NCHITTEST) return false;

    QPoint pos = mapFromGlobal(QCursor::pos());
    int w = width();
    int h = height();

    if (QRect(frameWidth, captionHeight, w-frameWidth-frameWidth, h-captionHeight-frameWidth).contains(pos))
    {
        *result = HTCLIENT;
    }
    else if (QRect(0, 0, w, captionHeight).contains(pos))
    {
        *result = HTCAPTION;
    }
    else if (QRect(0, captionHeight, frameWidth, h-captionHeight-frameWidth).contains(pos))
    {
        *result = HTLEFT;
    }
    else if (QRect(w-frameWidth, captionHeight, frameWidth, h-captionHeight-frameWidth).contains(pos))
    {
        *result = HTRIGHT;
    } 
    else if  (QRect(frameWidth, h-frameWidth, w-frameWidth-frameWidth, frameWidth).contains(pos))
    {
        *result = HTBOTTOM;
    } 
    else if (QRect(0, h-frameWidth, frameWidth, frameWidth).contains(pos))
    {
        *result = HTBOTTOMLEFT;
    }
    else if (QRect(w-frameWidth, h-frameWidth, frameWidth, frameWidth).contains(pos))
    {
        *result = HTBOTTOMRIGHT;
    }    
    return true;
}

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转载自blog.csdn.net/lengyuezuixue/article/details/81153259