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List: pykde
Subject: [PyQt] Cannot add item to itemgroups while itemchange() is defined
From: "Zoellner, Christian" <Christian.Zoellner () student ! hpi ! uni-potsdam ! de>
Date: 2013-05-21 9:56:28
Message-ID: 743744BA6A0A634AB062798355C63A4B03D0E7 () MXSTU2012 ! hpi ! uni-potsdam ! de
[Download RAW message or body]
Hello guys,
I currently have a very mysterious problem with PyQT and neither Stackoverf=
low (http://stackoverflow.com/q/16614187/2394681) nor any of my friends and=
coworkers can help me with it.
I'm building a PyQt QGraphicsView project where some QGraphicItems can be m=
oved around between different QGraphicsItemGroups. For that, I use the addI=
temToGroup() method of the "new" parent itemGroup.
This works fine, but only so long as I do not define the itemChange() metho=
d in my custom child-item class. Once I define that method (even if I just =
pass the function call to the super class), the childItems will not be adde=
d to ItemGroups no matter what I try.
class MyChildItem(QtGui.QGraphicsItemGroup):
def itemChange(self, change, value):
# TODO: Do something for certain cases of ItemPositionChange
return QtGui.QGraphicsItemGroup.itemChange(self, change, value)
#return super().itemChange(change, value) # Tried this variation =
too
Am I simply too stupid for properly calling a superclass method in Python, =
or is the problem somewhere in the QT / PyQT magic?
I use Python 3.3 with PyQt 4.8 and QT 5.
I would really appreciate any kind of help or ideas.
Thanks a lot,
Christian Z=F6llner
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New \
Roman","serif"">Hello guys,<o:p></o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New Roman","serif"">I \
currently have a very mysterious problem with PyQT and neither Stackoverflow (<a \
href="http://stackoverflow.com/q/16614187/2394681">http://stackoverflow.com/q/16614187/2394681</a>)
nor any of my friends and coworkers can help me with it.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New \
Roman","serif"">I'm building a PyQt QGraphicsView project where some \
QGraphicItems can be moved around between different QGraphicsItemGroups. For that, I \
use the addItemToGroup() method of the "new" parent itemGroup. <o:p> \
</o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New \
Roman","serif"">This works fine, but only so long as I do not define \
the itemChange() method in my custom child-item class. Once I define that method \
(even if I just pass the function call to the super class), the childItems will not \
be added to ItemGroups no matter what I try.<o:p></o:p></span></p> <p \
class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier \
New"">class MyChildItem(QtGui.QGraphicsItemGroup):<o:p></o:p></span></p> <p \
class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier \
New""> def itemChange(self, change, \
value):<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Courier \
New""> # TODO: Do something for \
certain cases of ItemPositionChange<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Courier \
New""> return \
QtGui.QGraphicsItemGroup.itemChange(self, change, value)<o:p></o:p></span></p> <p \
class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier \
New""> #return \
super().itemChange(change, value) # Tried this variation \
too<o:p></o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New Roman","serif"">Am \
I simply too stupid for properly calling a superclass method in Python, or is the \
problem somewhere in the QT / PyQT magic?<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New Roman","serif"">I \
use Python 3.3 with PyQt 4.8 and QT 5. <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New Roman","serif"">I \
would really appreciate any kind of help or ideas.<o:p></o:p></span></p> <p \
class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New \
Roman","serif"">Thanks a lot,<o:p></o:p></span></p> <p \
class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:12.0pt;font-family:"Times New \
Roman","serif"">Christian Zöllner<o:p></o:p></span></p> <p \
class="MsoNormal"><o:p> </o:p></p> </div>
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