重写

protected:
 bool nativeEvent(const QByteArray &eventType, void *message, long *result);

函数实现

bool Widget::nativeEvent(const QByteArray &eventType, void *message, long *result)
{
	Q_UNUSED(eventType)

		MSG *param = static_cast<MSG *>(message);

	switch (param->message)
	{
	case WM_NCHITTEST:
	{
		int nX = GET_X_LPARAM(param->lParam) - this->geometry().x();
		int nY = GET_Y_LPARAM(param->lParam) - this->geometry().y();

		// 如果鼠标位于子控件上，则不进行处理
		if (childAt(nX, nY) != NULL)
			return QWidget::nativeEvent(eventType, message, result);

		*result = HTCAPTION;

		// 鼠标区域位于窗体边框，进行缩放
		if ((nX > 0) && (nX < m_nBorder))
			*result = HTLEFT;

		if ((nX > this->width() - m_nBorder) && (nX < this->width()))
			*result = HTRIGHT;

		if ((nY > 0) && (nY < m_nBorder))
			*result = HTTOP;

		if ((nY > this->height() - m_nBorder) && (nY < this->height()))
			*result = HTBOTTOM;

		if ((nX > 0) && (nX < m_nBorder) && (nY > 0)
			&& (nY < m_nBorder))
			*result = HTTOPLEFT;

		if ((nX > this->width() - m_nBorder) && (nX < this->width())
			&& (nY > 0) && (nY < m_nBorder))
			*result = HTTOPRIGHT;

		if ((nX > 0) && (nX < m_nBorder)
			&& (nY > this->height() - m_nBorder) && (nY < this->height()))
			*result = HTBOTTOMLEFT;

		if ((nX > this->width() - m_nBorder) && (nX < this->width())
			&& (nY > this->height() - m_nBorder) && (nY < this->height()))
			*result = HTBOTTOMRIGHT;

		return true;
	}
	}

	return QWidget::nativeEvent(eventType, message, result);


}