Set graphic item position when scene changes

deanc

I want to reposition some items in a QGraphicsScene when the scene size changes, to keep some items along the left and right edges. I haven't figured out a way to do this that doesn't cause stack overflow or other badness. I'd like to be able to do something like this whenever the scene size changes (pseudo-code):

@void MyScene::setAlignedPositions()
{
QList<QGraphicsItem *> list = getAlignedItems();
foreach (QGraphicsItem * item, list)
{
item->setPos(sceneRect().right() - 50, sceneRect().top() - 50);
}@

or some reasonable facsimile thereof. Is this even possible?

Thanks!

rschaub

you'd have to get the transformed viewRect:

@
void CMyView::SlotSceneRectChanged(const QRectF & rect)
{
// get the viewport rect in scene coordinates
QRectF visibleRect = mapToScene(viewport().rect());

// now reposition your items
QList<QGraphicsItem *> list = scene()->getAlignedItems();

foreach (QGraphicsItem * item, list)
{
item->setPos(visibleRect.right() - 50, visibleRect.top() - 50);
}
}
@

? Offline

this line will throw error as it returns QPolygon

@QRectF visibleRect = mapToScene(viewport().rect());@

use

@ QRectF visibleRect = mapToScene(viewport().rect()).boundingRect();@