Hello,
Just to close this issue.
The problem was coming from a qt-bug (QTBUG-3018) which I just
re-opened. Basically if you draw a line with a pen that has a DashLine
style, and the line is null (the 2 points are identical), then QPainter
enters an infinite loop. It occurs only if the QPen has a DahsLine
style...
Philippe.
Le 29-03-2016 18:37, maitai a écrit :
Hello,
I have a QGraphicsScene (Qt 5.6 / Windows 10) in which I am injecting
quite a lot of items (around 10,000). After a while, the application
freezes (i.e the main thread in which the QGraphicsScene/View resides
is not responding anymore).
After much digging, my conclusion is that the scene is never returning
from a private slot, namely _q_processDirtyItems(). The last events
processed by the main thread are:
Metacall: "_q_processDirtyItems()"
processing event QEvent::Type(MetaCall) 0x1554
event in view QEvent::Type(Paint)
event in view ok 0x1554
And here I normally have a qWarning() saying that the metacall has
returned, which I never get, so I believe it enters in an infinite
loop somewhere.
At that point of the application no items were ever deleted, just
added.
I had a look at qt sources but couldn't find anything relevant to my
case.
I am sure I do not update/manipulate/etc any items or QGraphicsScene
related object from another thread.
Any insight that can help understanding what is going on here?
Thanks
Philippe
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