Garbage collection

[Septi]

Does QGraphicsScene delete all the graphic items/widgets/layouts upon deletion, or should I take care of them?
Because I don't need to access most of them, so I feel it's pointless to keep the pointers.

[tbscope]

The scene takes ownership. You don't need to delete the items yourself.

[Septi]

tbscope, thanks!

By the way, that means that if I decide to keep some pointers, they will become invalid, when scene gets deleted, or null, if they're smart pointers (QPointer), doesn't it?

[tbscope]

Yes

Be carefull with that. There's nothing wrong with keeping a list to all the objects but before using them check if they are valid. But I guess you already know that.
Edit: not that there is a reason to keep a list on your own, the scene already does that for you.
Edit 2: and if you want to have several lists, one for rectangles, one for text etc... you can always subclass the scene of course

[Septi]

Okay, I see, thanks.

and if you want to have several lists, one for rectangles, one for text etc... you can always subclass the scene of course

You mean by keeping a list of needed items inside a scene, reimplementing functions to add items and adding a function to retrieve the list? If so, in my case it's probably easier to just keep that list outside of QGraphicsScene, it's only used from outside anyway.

[tbscope]

No, I mean return a list of rectangles for example.
You keep the items list of the scene unchanged. But you use that list to return more information.

Pseudo code example:
foreach item in scene items
{
if item = rectangle
add to custom list
}
return custom list