From kde-devel  Sat Dec 28 16:54:25 2002
From: Arnold Krille <kde () arnoldarts ! de>
Date: Sat, 28 Dec 2002 16:54:25 +0000
To: kde-devel
Subject: Re: How to update a QPainted qwidget?
X-MARC-Message: https://marc.info/?l=kde-devel&m=104109457730945

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On Saturday 28 December 2002 08:21, Pablo de Vicente wrote:
>   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.

Paint your widget with the backgroundcolor first.

> - 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.

Do you use paintEvent()?
It should redraw you widget if the covering goes away...

Arnold
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