窗口设置为Qt::Popup时, 如何去掉窗口阴影?

CFlowerWid::CFlowerWid(QWidget *parent)
	: QWidget(parent)
{
	ui.setupUi(this);
	setWindowFlags(windowFlags() | Qt::FramelessWindowHint | Qt::Popup);
	setAttribute(Qt::WA_TranslucentBackground);
}CFlowerWid::CFlowerWid(QWidget *parent)
	: QWid