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qtbackgroundqpainter

Qt painting without clearing the background

I'm using a QPainter to get some graphics on a window. Unfortunately every time the paintEvent() function is called, the whole window is cleared. How can I draw without clearing? I.e. how do I leave the stuff from previous paint event untouched?

I'm using Qt4

Solution

  • You need to set the backgroundMode by using the setBackgroundMode setter. The Qt::NoBackground enum is what you are searching for.