Moving of QGraphicsItem

[spud]

I'm using Qt 4.2.0 open source on windows. I did exactly what you did in the movie clip and it worked just like it should. Your exception confirms my belief that the item isn't removed properly. I can't tell you why, but you might simplify your code by removing the repeated calls to itemToIndex and indexToItem.
Deleting objects in an event handler can be hairy. Try letting your items be subclasses of QObject as well and call QObject::deleteLater(). That might prevent the crash, but doesn't answer why the items aren't removed as they should.
Good Luck!

[Erlendhg]

Can QGraphicsItems be subclassed by QObject?
I tried that earlier, but then my program wouldn't compile.
It didn't look like it fancyed QObject...

I have seen the problem of deleting an item in an event handler, but I thought that was only for the items itself's event handlers. These items are deleted in the mainwindow's event handler.

Thanks anyway,
Erlend Graff

[Gopala Krishna]

Can QGraphicsItems be subclassed by QObject?
I tried that earlier, but then my program wouldn't compile.
It didn't look like it fancyed QObject...

Yes it can be done using multiple inheritance as follows. I guess someone had already asked this before. Probably you can find more info by forum search
Anyway here is quick one

class Item : public QObject, public QGraphicsItem
{
Q_OBJECT
public:
..
 
public slots:
..
};

class Item : public QObject, public QGraphicsItem
{
Q_OBJECT
public:
..

public slots:
..
};

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[Erlendhg]

That doesn't seem to help either
Even when I subclass QObject and use QObject::deleteLater() instead of deleting the item, I get the same bug.

[Erlendhg]

Ok, finally I found the solution of my quite annoying problem.
It was me that hadn't read the documentation carefully enoughed, so I had missed that QGraphicsItem:repareGeometryChange() had to be called whenever I resize my timeline items :P

After adding that, everything seems to work just fine
Just wanted to tell, in case someone experiences similar problems:
Remember to call QGraphicsItem:repareGeometryChange() before you change the boundingRect() of a QGraphicsItem