关于QMainWindow中的setCentralWidget（），一闪就关闭了，在mainwindow中没有显示 - QTCN开发网

只看楼主倒序阅读楼主发表于: 2009-03-27

创建了一个MainWindow类，从QMainWindow中继承，我用Qt  Assistant中的Colliding Mice Example做实验，
创建了一个类用来显示Colliding Mice

class Airport:public QWidget
{

public:
    Airport(QWidget *parent=0);
};

Airport::Airport(QWidget *parent/* =0 */):QWidget(parent)
{
    qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

    QGraphicsScene scene;
    scene.setSceneRect(-300, -300, 600, 600);
    scene.setItemIndexMethod(QGraphicsScene::NoIndex);

    for (int i = 0; i < MouseCount; ++i) {
        Mouse *mouse = new Mouse;
        mouse->setPos(::sin((i * 6.28) / MouseCount) * 200,
            ::cos((i * 6.28) / MouseCount) * 200);
        scene.addItem(mouse);
    }

    QGraphicsView view(&scene);
    view.setRenderHint(QPainter::Antialiasing);
    view.setCacheMode(QGraphicsView::CacheBackground);
    view.setDragMode(QGraphicsView::ScrollHandDrag);
    view.resize(400, 300);
    view.show();
}

结果Colliding Mice 一闪就没了，就剩一个mainwindow的空壳，请高手指点，怎样才能在mainwindow中的CentralWidget显示Colliding Mice

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只看该作者 1楼发表于: 2009-03-27

创建了一个MainWindow类，从QMainWindow中继承，我用Qt  Assistant中的Colliding Mice Example做实验，
创建了一个类用来显示Colliding Mice

class Airport:public QWidget
{

public:
    Airport(QWidget *parent=0);
};

Airport::Airport(QWidget *parent/* =0 */):QWidget(parent)
{
    qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

    QGraphicsScene scene;
    scene.setSceneRect(-300, -300, 600, 600);
    scene.setItemIndexMethod(QGraphicsScene::NoIndex);

    for (int i = 0; i < MouseCount; ++i) {
        Mouse *mouse = new Mouse;
        mouse->setPos(::sin((i * 6.28) / MouseCount) * 200,
            ::cos((i * 6.28) / MouseCount) * 200);
        scene.addItem(mouse);
    }

    QGraphicsView view(&scene);
    view.setRenderHint(QPainter::Antialiasing);
    view.setCacheMode(QGraphicsView::CacheBackground);
    view.setDragMode(QGraphicsView::ScrollHandDrag);
    view.resize(400, 300);
    view.show();
}

MainWindow::MainWindow()
{
    airport = new Airport;
    setCentralWidget(airport);

    createActions();
    createMenus();
    createToolBars();
    createStatusBar();
    createDockWindows();

    setWindowTitle(tr("AirPort Simulation"));

}

结果Colliding Mice 一闪就没了，就剩一个mainwindow的空壳，请高手指点，怎样才能在mainwindow中的CentralWidget显示Colliding Mice