Hi,
the small appended program crashes when you do the following:
- compile it with VS 2008, SP1 on WINDOWS XP, SP3 using Qt-4.6.0-rc1
- start it
- press the shortcut key "A" to activate the slot-function
"moveToBackground"
- close it
it crashes in the line "delete d->topLevelItems.first();" while trying to
use an already deleted item.
Best, Michael.
#include <QtGui>
static QGraphicsScene *myScene;
static QList<QGraphicsRectItem *> *myList;
class GraphicsView: public QGraphicsView
{
Q_OBJECT
public:
GraphicsView(QGraphicsScene *scene, QWidget *parent):
QGraphicsView(scene,parent) {}
public slots:
void moveToBackground();
};
void GraphicsView::moveToBackground()
{
QGraphicsItem *item=myList->at(2);
myScene->removeItem(item);
item->setZValue(0);
myScene->addItem(item);
}
#include "main.moc"
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QGraphicsScene scene;
myScene=&scene;
scene.setSceneRect(0, 0, 800, 480);
scene.setItemIndexMethod(QGraphicsScene::NoIndex);
QList<QGraphicsRectItem *> list;
myList=&list;
list.append(new QGraphicsRectItem(10,15,20,25));
list.append(new QGraphicsRectItem(20,17,20,25));
list.append(new QGraphicsRectItem(14,24,20,25));
QColor colors[3]={
QColor(Qt::red), //z==1
QColor(Qt::green), //z==2
QColor(Qt::blue) //z==3
};
for (int i=0; i < 3; ++i) {
list[i]->setFlag(QGraphicsItem::ItemIsMovable);
list[i]->setFlag(QGraphicsItem::ItemIsSelectable);
list[i]->setZValue(i+1);
list[i]->setPen(QPen(colors[i]));
scene.addItem(list[i]);
}
scene.setBackgroundBrush(Qt::white);
GraphicsView *view = new GraphicsView(&scene,NULL);
QAction *pAct=new QAction(view);
new
QShortcut(QString::fromLatin1("A"),view,SLOT(moveToBackground()),SLOT(moveToBackground()));
QObject::connect(pAct,SIGNAL(triggered()),view,SLOT(moveToBackground()));
view->show();
return app.exec();
}
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