[PyQt] Drag and Drop of subclassed QListWidgetItem
Massimiliano Costacurta
massi_srb at msn.com
Wed Jun 25 16:34:01 BST 2014
Thank you for the replies Vincent. Did you also try to bring back the items from the bottom list to the top list? I tried both with python 2.7.3 and 3.3 and the behavior is the same (taht is crash). Thanks for your help!
> From: pyqt-request at riverbankcomputing.com
> Subject: PyQt Digest, Vol 119, Issue 25
> To: pyqt at riverbankcomputing.com
> Date: Tue, 24 Jun 2014 12:00:01 +0100
>
> Send PyQt mailing list submissions to
> pyqt at riverbankcomputing.com
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://www.riverbankcomputing.com/mailman/listinfo/pyqt
> or, via email, send a message with subject or body 'help' to
> pyqt-request at riverbankcomputing.com
>
> You can reach the person managing the list at
> pyqt-owner at riverbankcomputing.com
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of PyQt digest..."
>
>
> Today's Topics:
>
> 1. Drag and Drop of subclassed QListWidgetItem (Massi)
> 2. Re: Drag and Drop of subclassed QListWidgetItem
> (Vincent Vande Vyvre)
> 3. Re: Drag and Drop of subclassed QListWidgetItem
> (Vincent Vande Vyvre)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 24 Jun 2014 10:44:01 +0200
> From: "Massi" <massi_srb at msn.com>
> To: <pyqt at riverbankcomputing.com>
> Subject: [PyQt] Drag and Drop of subclassed QListWidgetItem
> Message-ID: <DUB111-DS30B502A7A96A835D1A32289C1E0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi everyone,
>
> I'm encountering some poblems trying to implement drag and drop for a custom QListWidgetItem. Here is some example code:
>
> from PyQt4 import QtGui, QtCore
> import sys, os
>
> class MyListWidgetItem(QtGui.QListWidgetItem):
> def __init__(self, label, data, parent=None):
> super(QtGui.QListWidgetItem, self).__init__(label, parent=parent)
> self.data = data
>
> def GetData(self):
> return self.data
>
> class MyListWidget(QtGui.QListWidget):
> def __init__(self, type, parent=None):
> super(MyListWidget, self).__init__(parent)
> self.setDragDropMode(QtGui.QAbstractItemView.DragDrop)
> self.setSelectionMode(QtGui.QAbstractItemView.ExtendedSelection)
> self.setAcceptDrops(True)
> self.viewport().setAcceptDrops(True)
> self.setDropIndicatorShown(True)
>
> def startDrag(self, supportedActions):
> drag = QtGui.QDrag(self)
> t = [i.GetData() for i in self.selectedItems()]
> mimeData = self.model().mimeData(self.selectedIndexes())
> mimeData.setText(str(t))
> drag.setMimeData(mimeData)
> if drag.start(QtCore.Qt.MoveAction) == QtCore.Qt.MoveAction:
> for item in self.selectedItems():
> self.takeItem(self.row(item))
>
> def dragEnterEvent(self, event):
> if event.mimeData().hasUrls():
> event.ignore()
> else:
> event.accept()
>
> def dragMoveEvent(self, event):
> if event.mimeData().hasUrls():
> event.ignore()
> else:
> event.accept()
>
> def dropEvent(self, event):
> if event.mimeData().hasUrls():
> event.ignore()
> if isinstance(event.source(), MyListWidget):
> event.setDropAction(QtCore.Qt.MoveAction)
> super(MyListWidget, self).dropEvent(event)
> else:
> event.ignore()
>
> def dropMimeData(self, index, mimedata, action):
> super(MyListWidget, self).dropMimeData(index, mimedata, action)
> return True
>
> class Test(QtGui.QMainWindow):
> def __init__(self):
> super(QtGui.QMainWindow,self).__init__()
> myQWidget = QtGui.QWidget()
> myBoxLayout = QtGui.QVBoxLayout()
> myQWidget.setLayout(myBoxLayout)
> self.setCentralWidget(myQWidget)
>
> self.listWidgetA = MyListWidget(self)
> self.listWidgetB = MyListWidget(self)
>
> for i in range(5):
> listItemAInstance = MyListWidgetItem(str(i), i, parent=self.listWidgetA)
>
> myBoxLayout.addWidget(self.listWidgetA)
> myBoxLayout.addWidget(self.listWidgetB)
>
> if __name__ == '__main__':
> app = QtGui.QApplication(sys.argv)
> dialog_1 = Test()
> dialog_1.show()
> dialog_1.resize(480,320)
> sys.exit(app.exec_())
>
> My custom class MyListWidgetItem has a 'data' field which in my real program holds some information related to the item. If you run the code and try to drag and drop items from the top list to the bottom one everything works, but if you then try to bring them back to the top list you get this error:
>
> Traceback (most recent call last):
> File "C:\Users\Massi\Desktop\t.py", line 23, in startDrag
> t = [i.GetData() for i in self.selectedItems()]
> AttributeError: 'QListWidgetItem' object has no attribute 'GetData'
>
> It seems pretty clear that the default drag and drop behaviour ignores that the list items have been subclassed, so I wonder which is the best to deal with this situation. Any help is really appreciated.
> Thanks in advance!
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <http://www.riverbankcomputing.com/pipermail/pyqt/attachments/20140624/8926cfb7/attachment-0001.html>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 24 Jun 2014 12:24:43 +0200
> From: Vincent Vande Vyvre <vincent.vandevyvre at swing.be>
> To: pyqt at riverbankcomputing.com
> Subject: Re: [PyQt] Drag and Drop of subclassed QListWidgetItem
> Message-ID: <53A951EB.4070306 at swing.be>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Le 24/06/2014 10:44, Massi a écrit :
> > Hi everyone,
> > I'm encountering some poblems trying to implement drag and drop for a
> > custom QListWidgetItem. Here is some example code:
> > from PyQt4 import QtGui, QtCore
> > import sys, os
> > class MyListWidgetItem(QtGui.QListWidgetItem):
> > def __init__(self, label, data, parent=None):
> > super(QtGui.QListWidgetItem, self).__init__(label, parent=parent)
> > self.data = data
> > def GetData(self):
> > return self.data
> > class MyListWidget(QtGui.QListWidget):
> > def __init__(self, type, parent=None):
> > super(MyListWidget, self).__init__(parent)
> > self.setDragDropMode(QtGui.QAbstractItemView.DragDrop)
> > self.setSelectionMode(QtGui.QAbstractItemView.ExtendedSelection)
> > self.setAcceptDrops(True)
> > self.viewport().setAcceptDrops(True)
> > self.setDropIndicatorShown(True)
> > def startDrag(self, supportedActions):
> > drag = QtGui.QDrag(self)
> > t = [i.GetData() for i in self.selectedItems()]
> > mimeData = self.model().mimeData(self.selectedIndexes())
> > mimeData.setText(str(t))
> > drag.setMimeData(mimeData)
> > if drag.start(QtCore.Qt.MoveAction) == QtCore.Qt.MoveAction:
> > for item in self.selectedItems():
> > self.takeItem(self.row(item))
> > def dragEnterEvent(self, event):
> > if event.mimeData().hasUrls():
> > event.ignore()
> > else:
> > event.accept()
> > def dragMoveEvent(self, event):
> > if event.mimeData().hasUrls():
> > event.ignore()
> > else:
> > event.accept()
> > def dropEvent(self, event):
> > if event.mimeData().hasUrls():
> > event.ignore()
> > if isinstance(event.source(), MyListWidget):
> > event.setDropAction(QtCore.Qt.MoveAction)
> > super(MyListWidget, self).dropEvent(event)
> > else:
> > event.ignore()
> > def dropMimeData(self, index, mimedata, action):
> > super(MyListWidget, self).dropMimeData(index, mimedata, action)
> > return True
> > class Test(QtGui.QMainWindow):
> > def __init__(self):
> > super(QtGui.QMainWindow,self).__init__()
> > myQWidget = QtGui.QWidget()
> > myBoxLayout = QtGui.QVBoxLayout()
> > myQWidget.setLayout(myBoxLayout)
> > self.setCentralWidget(myQWidget)
> > self.listWidgetA = MyListWidget(self)
> > self.listWidgetB = MyListWidget(self)
> > for i in range(5):
> > listItemAInstance = MyListWidgetItem(str(i), i,
> > parent=self.listWidgetA)
> > myBoxLayout.addWidget(self.listWidgetA)
> > myBoxLayout.addWidget(self.listWidgetB)
> > if __name__ == '__main__':
> > app = QtGui.QApplication(sys.argv)
> > dialog_1 = Test()
> > dialog_1.show()
> > dialog_1.resize(480,320)
> > sys.exit(app.exec_())
> > My custom class MyListWidgetItem has a 'data' field which in my real
> > program holds some information related to the item. If you run the
> > code and try to drag and drop items from the top list to the bottom
> > one everything works, but if you then try to bring them back to the
> > top list you get this error:
> > Traceback (most recent call last):
> > File "C:\Users\Massi\Desktop\t.py", line 23, in startDrag
> > t = [i.GetData() for i in self.selectedItems()]
> > AttributeError: 'QListWidgetItem' object has no attribute 'GetData'
> > It seems pretty clear that the default drag and drop behaviour ignores
> > that the list items have been subclassed, so I wonder which is the
> > best to deal with this situation. Any help is really appreciated.
> > Thanks in advance!
> >
> >
> > _______________________________________________
> > PyQt mailing list PyQt at riverbankcomputing.com
> > http://www.riverbankcomputing.com/mailman/listinfo/pyqt
> Works fine for me.
>
> Platform Linux-3.2.0-48-generic-pae-i686-with-Ubuntu-12.04-precise
> Qt 4.8.1
> Python 2.7.3
> PyQt 4.9.1
> Sip 4.13.2
>
> --
> Vincent V.V.
> Oqapy <https://launchpad.net/oqapy> . Qarte
> <https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 24 Jun 2014 12:34:01 +0200
> From: Vincent Vande Vyvre <vincent.vandevyvre at swing.be>
> To: pyqt at riverbankcomputing.com
> Subject: Re: [PyQt] Drag and Drop of subclassed QListWidgetItem
> Message-ID: <53A95419.4030603 at swing.be>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Le 24/06/2014 12:24, Vincent Vande Vyvre a écrit :
> > Le 24/06/2014 10:44, Massi a écrit :
> >> Hi everyone,
> >> I'm encountering some poblems trying to implement drag and drop for a
> >> custom ...
> > Works fine for me.
> >
> > Platform Linux-3.2.0-48-generic-pae-i686-with-Ubuntu-12.04-precise
> > Qt 4.8.1
> > Python 2.7.3
> > PyQt 4.9.1
> > Sip 4.13.2
> >
> Works too with Python 3
>
> Python 3.2.3
> Qt 4.8.1
> PyQt 4.10.2
> Sip 4.14.7
>
> --
> Vincent V.V.
> Oqapy <https://launchpad.net/oqapy> . Qarte
> <https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> PyQt mailing list
> PyQt at riverbankcomputing.com
> http://www.riverbankcomputing.com/mailman/listinfo/pyqt
>
> ------------------------------
>
> End of PyQt Digest, Vol 119, Issue 25
> *************************************
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.riverbankcomputing.com/pipermail/pyqt/attachments/20140625/c9a64000/attachment-0001.html>
More information about the PyQt
mailing list