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List: kde-devel
Subject: How to update a QPainted qwidget?
From: Pablo de Vicente <pvicentea () wanadoo ! es>
Date: 2002-12-28 7:21:10
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Hello,
I am writing some code in which I use QPainter to draw some axis and curves
on a qwidget. Now I have two basic problems:
- When the axis change I try to redraw them calling update(). When doing this
instead of erasing the previous content of the widget and drawing the new
axis I only append the new ones. I have tried with repaint(true), and I have
also used erase() before calling update() or repaint(). But none of this
works.
- - if I raise a window in front of the widget where I have the curves and then
move the window to another place so that my widget is not covered by anything
the content of the qwidget disappears. That is I loose the axis and curves I
had previously drawn.
With such brief description can someone tell me what I am missing to do
things correctly?.
thanks,
Pablo de Vicente.
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