CODEWITHSUNDEEP
wxpython
user1074844
user1074844

Reputation: 11

wxPython Drag and Drop exit code 139 crash

I am experimenting with wxPython trying to learn drag and drop. Why doesn't the following work on Linux? The app starts up, but when I drag the static text into the text field, I get a 139 exit code with version 2.8 using python 2.7.

import wx
class DropTarget(wx.DropTarget):
    def __init__(self):
            wx.DropTarget.__init__(self)
            self.dataobject = wx.PyTextDataObject()
            self.SetDataObject(self.dataobject)
    def OnData(self, x, y, d):
            pass

class Txt(wx.StaticText):
    def __init__(self, parent, label_):
            wx.StaticText.__init__(self, parent, label=label_)
            self.Bind(wx.EVT_LEFT_DOWN, self.handle)
    def handle(self, event):
            ds = wx.DropSource(self)
            d = wx.PyTextDataObject('some text')
            ds.SetData(d)
            ds.DoDragDrop(True)

class MyFrame(wx.Frame):
    def __init__(self):
            wx.Frame.__init__(self, None, -1, 'whatevs')
            main_panel = wx.Panel(self)

            txt = Txt(main_panel, 'ONE')
            txt2 = wx.TextCtrl(main_panel)

            s = wx.BoxSizer(wx.VERTICAL)
            s.Add(txt)
            s.Add(txt2)
            main_panel.SetSizer(s)

            dt = DropTarget()
            txt2.SetDropTarget(dt)


if __name__ == '__main__':
    app = wx.App()
    MyFrame().Show(True)
    app.MainLoop()

Upvotes: 1

Views: 262

Answers (1)

Luke Woodward
Luke Woodward

Reputation: 65024

Try replacing the line

        ds = wx.DropSource(self)

with

        ds = wx.DropSource(self.GetParent())

I was able to reproduce the crash you are seeing, but once I made the above change the crash went away.

It seems that for some reason, wx doesn't like instances of wx.StaticText (or subclasses of it in your case) being passed to the wx.DropSource constructor. I'm not sure why.

I changed your code so that Txt derived from wx.TextCtrl instead of wx.StaticText and I couldn't reproduce the problem any more. I also tried playing around with the first sample program found on http://wiki.wxpython.org/DragAndDrop, and found that I could make it crash if I set the drop source to be one of the StaticText objects this code creates instead of a TextCtrl.

If there's anything in the wxWidgets or wxPython documentation that says you can't use a wx.StaticText as a drop source, I didn't find it. It certainly wasn't obvious to me. (The documentation for wxDropSource says that you pass to each constructor

The window which initiates the drag and drop operation.

However, there doesn't appear to be any restriction on the types of 'window' (or 'widget') that you can use as a drop source.)

Upvotes: 1

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