On Mon, Mar 13, 2006 at 12:20:28PM +0100, Abdelrazak Younes wrote: > Juergen Spitzmueller a écrit : > >Abdelrazak Younes wrote: > >>>The problems seems to be that we try to initialize the QPainter object > >>>multiple times (at least in QLPainter). This is not allowed: > >>>http://doc.trolltech.com/4.1/qpainter.html#QPainter-2 > >>Yep and that's why I erased all use of qp_ private member in > >>"QLPainter.C" (start() and end() do nothing). > > > >Hmm, I would have suspected that exactly this change is what causes the > >error. > > I am not sure because QLPainter is only painting onto a pixmap. The only > painting onto an X11 device is in QWorkArea::paintEvent.
I thought even painting into a pixmap should only be done in a paintEvent(). The pixmap is located on the server side after all... > >Did you encounter some problems with the use of qp_? > > Yes, I had big troubles making it works. I managed to get it working but > at the end, I just noticed that using a QPainter for each operation was > not that complicated and actually resulted in less code (please compare > it with qt2 version). Plus it's the recommended way to use QPainter in > Qt4 documentation because of that very problem. Indeed. QPainters should not be cached unnecessarily. Andre'
