Hi everybody,
I'm facing segfault in succession of deleting a number of QGraphicsItems from a
scene.
The following code leads to the stack trace below on the next redraw of the
scene.
while (not m_items.isEmpty())
{
QGraphicsItem *item = m_items.takeFirst();
m_scene->removeItem(item); // qtdoc says it's faster to remove item first
then delete
delete item;
}
The interesting things is that without the removeItem() call, i.e. just calling
delete on the items, my program does not crash.
0 QGraphicsSceneFindItemBspTreeVisitor::visit(QList<QGraphicsItem*>*)
0x1075cff
1 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074c40
2 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074ce0
3 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074c40
4 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074c40
5 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074c40
6 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074c40
7 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074c40
8 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074c40
9 QGraphicsSceneBspTree::climbTree(QGraphicsSceneBspTreeVisitor*, QRectF
const&, int) const 0x1074ce0
10 QGraphicsSceneBspTree::items(QRectF const&, bool) const
0x107539e
11 QGraphicsSceneBspTreeIndexPrivate::estimateItems(QRectF const&,
Qt::SortOrder, bool) 0xf24058
12 QGraphicsSceneBspTreeIndex::estimateTopLevelItems(QRectF const&,
Qt::SortOrder) const 0xf24233
13 QGraphicsScenePrivate::drawItems(QPainter*, QTransform const*,
QRegion*, QWidget*) 0xf194ad
14 QGraphicsView::paintEvent(QPaintEvent*) 0xf3505c
15 QWidget::event(QEvent*) 0xa6941a
16 QFrame::event(QEvent*) 0xd81236
17 QGraphicsView::viewportEvent(QEvent*) 0xf362bb
18 QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*,
QEvent*) 0x11992b7
19 QApplicationPrivate::notify_helper(QObject*, QEvent*)
0xa240f1
20 QApplication::notify(QObject*, QEvent*) 0xa2c63f
... <More>
....Volker
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