Hi Andrea,

I'm shooting in the dark BUT you have

if not self.GetData():
return wx.DragNone

draginfo = self._dataobject.GetData()

shouldn't that be

if not self._dataobject.GetData():
return wx.DragNone

draginfo = self._dataobject.GetData()

Peter.

10/24/06, Andrea Gavana <andrea.gavana (AT) gmail (DOT) comwrote:

Hi all,

I am trying to implement some DnD from a treectrl to a
flatnotebook. Everything works fine, except the implementation of
D inside a DropTarget class.
Basically, if the dragged tree item has no associated data (empty
dictionary), I would like to have the same "barred" icon which
provides a visual feedback to the user (the dop can't be performed
because there is no data).

This is what I do:

class DropTarget(wx.DropTarget):

def __init__(self, parent):
""" Default class constructor. """

wx.DropTargetinit__(self)

self._parent = parent
self._dataobject =
wx.CustomD(wx.CustomDataFormat("SymphonyPlot"))
self.SetD(self._dataobject)
--
def D(self, x, y, dragres):

if not self.GetData():
return wx.DragNone

draginfo = self._dataobject.GetData()
drginfo = cPickle.loads(draginfo)

if not drginfo.GetPlotData():
return wx.DragNone

return dragres
--
def Data(self, x, y, dragres):
""" Handles the Data() method to call the real DnD routine. """

if not self.GetData():
return wx.DragNone

draginfo = self._dataobject.GetData()
drginfo = cPickle.loads(draginfo)

if not drginfo.GetPlotData():
return wx.DragNone

return DropTarget(x, y, drginfo.GetPlotData())
--
Well, I am surely doing something stupid here, but as soon as
D is called, Python crashes with the usual Windows error
message box. The offending line in D is:

if not self.GetData():
return wx.DragNone

Does anyone know what I may be doing wrong?

Thank you for every hint.
--
Andrea.

"Imagination Is The Weapon In The War Against Reality."

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