Hey All,
I'm having an issue with a tool I'm working on regarding slot-based
widget deletion.
I'm trying to create a UI where my object which handles data processing
reports it's progress on various (possibly nested) tasks back to the
UI. It's a mesh processor, so it can be pretty intensive. I'm actually
using these progress bars to try and identify where a memory leak is
right now, so I can track it down, but it would be dead useful to have
for general purposes as well.
I've made up a simpler script to demo the situation, here:
http://pythonfiddle.com/progress-bar-test
The relevant code is in the final class, in the three slots that connect
to PBTester (lines 84-113). I don't think I need to call self.update()
on every loop, but it does slow things down for the visual of the
progress bars.
The issue I'm having is that when the processCompleted Signal fires, it
doesn't seem to actually delete the given progress bar. It's removed
from the layout, but the visual stays in place and gets overlaid by the
new progress bar. My guess from the research I've done is that this has
something to do with deleteLater not being called while in the process,
but I don't understand the event loop well enough yet to make much sense
of it. The closest page I've been able to find recommended calling
emit() with Qt.QueuedConnection, and I did try that, but I don't think I
was doing it right, as it didn't seem to do anything. I'm not using
threads either, so I don't think it's a sync issue, but I'm not sure if
Qt is using them under the hood or not.
Hopefully that makes sense. Any thoughts from the pros?
Thanks,
Joe
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