wxGTK+ wxComboBox deselection

Question

When creating wx.ComboBox under Windows you can specify wxCB_READONLY to let users select from only proposed options. But you can clear selection by:

combo.SetSelection(wx.NOT_FOUND)

But under linux (wxGTK) the option is deselected on creation, but once selected in cannot be cleared. Not by any of following:

combo.SetSelection(wx.NOT_FOUND)
combo.SetValue('')

Is it possible to do this anyhow?

Answer 1

Actually, setting the value to an empty string works for me on Arch Linux:

import wx

########################################################################
class MyPanel(wx.Panel):
    """"""

    #----------------------------------------------------------------------
    def __init__(self, parent):
        """Constructor"""
        wx.Panel.__init__(self, parent)

        choices = ["", "1", "2", "3"]
        self.choices = choices
        self.cbo = wx.ComboBox(self, value="1", choices=choices)
        btn = wx.Button(self, label="Reset")
        btn.Bind(wx.EVT_BUTTON, self.onReset)

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.cbo, 0, wx.ALL, 5)
        sizer.Add(btn, 0, wx.ALL, 5)
        self.SetSizer(sizer)

    #----------------------------------------------------------------------
    def onReset(self, event):
        """"""
        print "resetting"
        self.cbo.SetValue("")


########################################################################
class MyFrame(wx.Frame):
    """"""

    #----------------------------------------------------------------------
    def __init__(self):
        """Constructor"""
        wx.Frame.__init__(self, None, title="CombBox")
        panel = MyPanel(self)
        self.Show()

if __name__ == "__main__":
    app = wx.App(False)
    frame = MyFrame()
    app.MainLoop()