這里討論的只是Windows平臺上的實現。
在QT中繪制異形窗口,只要設定 windowFlag 為 CustomizeWindowHint,再結合setMask()就可以做出各種奇形怪狀的窗口。相對來說比較麻煩的, 是進行窗口拖動和縮放的處理。
在 Windows SDK 和 MFC 中比較容易,只要處理 WM_NCHITTEST,返回相應的測試值就可以了。幸運的是,QT中也提供了直接處理各平臺消息的方法,在 Windows下只需要重載winEvent方法。
下面給出了示例代碼:
// 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;
}
