[PyQt] QPainter

[Phil Thompson]

On Thursday 13 December 2007, lucaberto at libero.it wrote:
> Hello i post the same question of two weeks ago but i never get a reply,
> probably because is a stupid question but pls help me.
>
> i do this code :
>  def cornice(self):
>         import math
>         nome_cal = self.lineEdit.text()
>         if nome_cal =='':
>             while 2 :
>                 dlg_line = QtGui.QMessageBox.warning(self,'Pls Attention', 
> 'You must insert a name for the calibration', QtGui.QMessageBox.Cancel)
> break
>         else :
>             self.frame1.setAttribute(QtCore.Qt.WA_PaintOutsidePaintEvent)
>             grone = QtGui.QPainter(self.frame1)
>             pen = QtGui.QPen()
>             pen.setWidth(1)
>             #disegno contorno grafico
>             grone.setPen(pen)
>             grone.drawText(30, 35, '50 daN/mm')
>             grone.drawText(395, 30, nome_cal)
>             grone.drawText(30, 430, '0')
>             grone.drawText(30, 240, '25')
>             grone.drawText(816,430, '0')
>             grone.drawText(816, 240, '90')
>             grone.drawText(806, 35, 'Deg 180')
>             grone.drawText(395, 480, 'Frequency Hz')
>             grone.drawText(55, 445, '0')
>             grone.drawText(796, 445, '120')
>             grone.drawLine(60,40,60,430)
>             grone.drawLine(60, 40, 801, 40)
>             grone.drawLine(801, 40, 801, 430)
>             grone.drawLine(60, 430, 801, 430)
>             ## some other line##
>             grone.end()
>             app.processEvents()
>
> as you can see i draw in a frame located in a tab2, my question is why 
> when i switch to tab1 and then back to tab2 the frame is clear? And why if
> i minimize the widget the farme is clear again?
> How i can solve this problem.

By doing all your painting from within paintEvent().

Phil