qt - QGraphicScene 弹出窗口一秒钟然后消失

Question

我的所有代码都在 mainWindow 的构造函数中。问题是显示只弹出一秒钟然后就消失了。任何帮助都感激不尽 。以下是代码。

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent)
{
QPixmap kineticPix(":/images/kinetic.png");
QPixmap bgPix(":/images/Time-For-Lunch-2.jpg");

QGraphicsScene scene(-350, -350, 700, 700);
QGraphicsItem *buttonParent = new QGraphicsRectItem;

Button *ellipseButton = new Button(QPixmap(":/images/ellipse.png"), buttonParent);
Button *figure8Button = new Button(QPixmap(":/images/figure8.png"), buttonParent);
Button *randomButton = new Button(QPixmap(":/images/random.png"), buttonParent);
Button *tiledButton = new Button(QPixmap(":/images/tile.png"), buttonParent);
Button *centeredButton = new Button(QPixmap(":/images/centered.png"), buttonParent);

ellipseButton->setPos(-100, -100);
figure8Button->setPos(100, -100);
randomButton->setPos(0, 0);
tiledButton->setPos(-100, 100);
centeredButton->setPos(100, 100);

scene.addItem(buttonParent);
buttonParent->scale(0.75, 0.75);
buttonParent->setPos(200, 200);
buttonParent->setZValue(65);


}

Answer 1

您已经在堆栈上创建了场景并且没有将其分配给成员变量，因此一旦控制离开构造函数，它就会被删除。