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overriden method OnCompareItems of wx.TreeCtrl not called #774

jensgoe opened this Issue Mar 1, 2018 · 4 comments


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jensgoe commented Mar 1, 2018

Operating system: Win7
wxPython version: (4, 0, 2, 'a1')
Stock or custom build: custom (official source)
Python version: 2.7.14
Stock or custom build: stock

Description of the problem:
If i derive from wx.TreeCtrl and override OnCompareItems it is not called after calling SortChildren.
Click the right mouse button to sort the children of an item. The output of OnCompareItem is not shown out log. The items are not sorted in numerical order like expected (implemented in OnCompareItems).

import wx

class MyTreeCtrl(wx.TreeCtrl):

    def __init__(self, parent):
        wx.TreeCtrl.__init__(self, parent, style=wx.TR_HAS_BUTTONS)  # | wx.TR_HIDE_ROOT)

        root = self.AddRoot("Root")
        for i in range(20):
            item = self.AppendItem(root, str(i))
            for i in range(20):
                self.AppendItem(item, str(i))

        self.Bind(wx.EVT_RIGHT_DOWN, self.OnRightDown)

    def OnRightDown(self, event):
        pt = event.GetPosition();
        item, flags = self.HitTest(pt)
        if item:

    def OnCompareItems(self, item1, item2):
        t1 = int(self.GetItemText(item1))
        t2 = int(self.GetItemText(item2))

        if t1 < t2: return -1
        if t1 == t2: return 0
        return 1

class MyApp(wx.App):

    def OnInit(self):
        f = wx.Frame(None)
        tc = MyTreeCtrl(f)
        return True

if __name__ == "__main__":
    app = MyApp()

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jensgoe commented Mar 8, 2018

i fixed this by modifying the sip generated cpp code like in the attached patch. but i don't know how to tweak this modification within the etg scripts.

@RobinD42 RobinD42 self-assigned this Mar 9, 2018


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RobinD42 commented Mar 9, 2018

Unfortunately there isn't a good way to inject code into that class so I think I'm going to have to be more creative...


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jensgoe commented Mar 12, 2018

Are you planning to merge this into the 4.0.x branch?


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RobinD42 commented Mar 12, 2018

It already has been.

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