以下代码有什么区别,
QGraphicsScene * scence = new QGraphicsScene();
QBrush *brush = new QBrush((QColor(60,20,20)));
scence->setBackgroundBrush(*brush);
QGraphicsView *view = new QGraphicsView();
view->setScene(scence);
//view->setBackgroundBrush(*brush);
//view->setCacheMode(QGraphicsView::CacheBackground);
view->showFullScreen();
给出黑色背景
QGraphicsScene * scence = new QGraphicsScene();
QBrush *brush = new QBrush();
brush->setColor(QColor(60,20,20));
scence->setBackgroundBrush(*brush);
QGraphicsView *view = new QGraphicsView();
view->setScene(scence);
//view->setBackgroundBrush(*brush);
//view->setCacheMode(QGraphicsView::CacheBackground);
view->showFullScreen();
它什么也没给。