[Qt-interest] QGraphicsItem and setZValue..how it works?

[Thiago Macieira]

Em Segunda-feira 19 Outubro 2009, às 11:03:30, você escreveu:
> Hi,
> 
> i have two QGraphicsItem with setZValue(32)
> Those items are represented as rectangle on the screen
> 
> both items have childs (smallest rectangle) with setZValue(40)
> 
> The problem is this:
> 
> If i drag a child of the first item on the second one it is drawed under
>  the item while i espect it to be over the item due to the bigger Z
>  value....
> 
> Whi this appens?

The Z-order applies to siblings only. So if you have two items that are 
children of the same parent with different z-order, the one with highest z-
order will be drawn on top of the other.

However, that's not what you have. You have two items that are siblings with 
the same z-order (32). And each of those has a child item, whose z-order 
doesn't matter.

Since the two siblings have the same z-order, they and their children are 
drawn according to pointer address (I think). That's why the grandchild item 
is drawn under the child, even though the z-order is greater.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
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