[PyQt] QTreeWidget qnd QPaintEngine error
RUI.NARCISO at airbus.com
Tue Nov 17 13:59:18 GMT 2009
Having browsed through the PyQt and Qt mailing lists without finding a clear answer I'll ask my question here.
I have a QTreeWidget which is populate with several hundred nodes.
At the press of a button a loop is executed on all of the nodes whereby a child node is createt and a request is put in a queue which is in a separate thread.
This worker thread will do it's work and send a signal per item with a color to assign to each child item.
My problem is that:
- given the high number of nodes
- given the "sometimes" quick execution of the work on the worker thread
I have the situation whereby I am trying to set the color of a child node at the same time that I'm adding a new node.
I then get a
QPaintEngine::setSystemClip: Should not be changed while engine is active
QWidgetPrivate::beginSharedPainter: Painter is already active
QPainter::begin: A paint device can only be painted by one painter at a time.
I've tried testing for self.tree.paintingActive() before setting the color of my QTreeWidgetItem but it never returns any value. (self.tree being my QTreeWidget).
I even tried self.paintingActive() (being self my QMainWindow) with the same result.
So my questions are:
- does anyone know out the top of one's head (wihout looking at the code) where the problem can come from?
- can anyone see a concept error on mmy approach?
Thanks for the theoretical answer to my conceptual error
PS: I don't send a code to show the error cause I'd take me forever to try to reproduce this error given the intricated design I have .... sorry!!!
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