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app using "excessive" CPU

Solved General and Desktop

42 Posts 10 Posters 7.2k Views 4 Watching

M mzimmers
@Bonnie you nailed it. I moved the load to the c'tor, and everything works much better now.

A couple of notes:
1. I turned on my event filter, and it's no longer spewing zillions of events, so I guess my keyPress idea would have worked (if Windows wasn't so lame).
2. I tried making my painter a member variable and initializing it in the c'tor, but that didn't work. Any idea why?
Thanks to everyone who looked at this.
B Offline
B Offline
Bonnie

wrote on last edited by

#41

@mzimmers
You can only create and use a painter of a widget in its paintEvent.
1 Reply Last reply

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M mzimmers
@Bonnie you nailed it. I moved the load to the c'tor, and everything works much better now.

A couple of notes:
1. I turned on my event filter, and it's no longer spewing zillions of events, so I guess my keyPress idea would have worked (if Windows wasn't so lame).
2. I tried making my painter a member variable and initializing it in the c'tor, but that didn't work. Any idea why?
Thanks to everyone who looked at this.
J Offline
J Offline
jsulm
Lifetime Qt Champion
wrote on last edited by

#42

@mzimmers To add to @Bonnie it is actually explained in the documentation https://doc.qt.io/qt-5/qpainter.html :
"Warning: When the paintdevice is a widget, QPainter can only be used inside a paintEvent() function or in a function called by paintEvent()."
https://forum.qt.io/topic/113070/qt-code-of-conduct
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