At 14:20 11/12/2006 +0100, Remy Anthoine wrote:
Greetings,
I'm having trouble using the removeItem operation of a scene in PyQt4
with python 2.5 under windows XP. Can someone explain why the
following produces an error of type : "python.exe has encountered a
problem and needs to close. We are sorry for the inconvenience."
import sys
from PyQt4 import QtCore, QtGui
class testtotrash(QtGui.QWidget):
def __init__(self,parent= None):
QtGui.QWidget.__init__(self, parent)
scene = QtGui.QGraphicsScene()
scene.addText("TEST")
for i in scene.items():
scene.removeItem(i)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
myTTT = testtotrash()
myTTT.show()
sys.exit(app.exec_())
I discovered this was a problem in a larger application where I
sometimes remove all the items of a scene. It worked fine with
ellipses or pixmaps but not since I started using QGraphicsTextItem.
In the larger application, I get the following message along with
windows' "python.exe has encountered..." :
QGraphicsScene::removeItem: item 017098D8's scene (00000000) is
different from this scene (016AF2E8)
I guess it is because when you delete an item, its children items are
deleted too.
I delete all items from the scene (keeping a particular one) as:
def __clearAll(self):
"""
Clear the print preview window, remove all items
but and keep the page.
"""
itemlist = self.scene.items()
keep = self.page
while (len(itemlist) != 1):
if itemlist.index(keep) == 0:
self.scene.removeItem(itemlist[1])
else:
self.scene_.removeItem(itemlist[0])
itemlist = self.scene.items()
I hope that helps.
Armando
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