[PyKDE] drawing on QCanvas not working

[Peter Hinely]

Hello all,

I'm trying to accomplish the simple task of drawing an elipse on a QCanvas
viewed through a QCanvasView.  I can draw the ellipse fine if I don't have
the QCanvasView inside a QMainWindow.  But when I embed it in a
QMainWindow, the ellipse does not appear.  Below is the code needed to
duplicated the problem.  Can anything tell me whether I'm doing something
wrong or whether I've encountered a bug?

#!/usr/bin/env python

import sys, string
from qt import *

class TopologyCanvasView(QCanvasView):
    def __init__(self, canvas, parent):
        QCanvasView.__init__(self, canvas, parent)

class ApplicationWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self,None,'main window',Qt.WDestructiveClose)

        self.file = QPopupMenu(self)
        self.menuBar().insertItem('&File',self.file)

self.file.insertItem('E&xit',qApp,SLOT('closeAllWindows()'),Qt.CTRL +
Qt.Key_E)

        newCanvas = QCanvas(200,200)
        canvasView = QCanvasView(newCanvas, self)

        self.setCentralWidget(canvasView)
        item = QCanvasEllipse(20, 20, newCanvas)
        item.setX(50)
        item.setY(50)
        item.setPen(QPen(Qt.red))
        item.setBrush(QBrush(Qt.blue))
        item.show()

        canvasView.show()

        self.statusBar().message('Ready',2000)
        self.resize(350,400)

a = QApplication(sys.argv)
mw = ApplicationWindow()
mw.show()
a.connect(a, SIGNAL('lastWindowClosed()'), a, SLOT('quit()'))
a.exec_loop()



#===========================================================
# This code without the QMainWindow works fine
# The code was written by someone on this list I think
#===========================================================

#!/usr/bin/env python

import sys
from qt import *

qapp=QApplication(sys.argv)

canvas=QCanvas(200, 400)
canvasView=QCanvasView(canvas)

item = QCanvasEllipse(20, 20, canvas)
item.setX(50)
item.setY(50)
item.setPen(QPen(Qt.red))
item.setBrush(QBrush(Qt.blue))
item.show()

canvas.resize(200, 200)
canvasView.show()

qapp.connect(qapp, SIGNAL('lastWindowClosed()'), qapp, SLOT('quit()'))
qapp.exec_loop()