[Qt-interest] Using QGraphicsLayouts inside QGraphicsWidgets

[Schimkowitsch Robert]

I would like to create a QGraphicsWidget (something like a toolbar),
that uses a QGraphicsLinearLayout inside, to manage the child
GraphicsWidgets.

My new GraphicsWidgets (let's call it ButtonBar) derives from
QGraphicsWidget, and has a QGraphicsLinearLayout as a member.

I have methods to add and remove items from the ButtonBar, and I
basically expose the LinearLayout's SizeHint as the ButtonBar's SizeHint
(so any outside layout will know how much room all my buttons need).

However, I have stumbled accross one problem I don't see a clean
solution to:
How will I realize when my LinearLayout needs to change it's size hint
(e.g. because one of the buttons changed in size), so I can call
updateGeometry and have my parent layout update?
It's all very well when a button is added and removed - I can always
call updateGeometry then. But what if a button changes in size for some
other reason? How will I know?

Any ideas how to solve that?

Kind regards

Robert Schimkowitsch

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