TextValidator

class TextValidator(wx.TextCtrl):
    def __init__(self, parent, *args, **kwargs):
        wx.TextCtrl.__init__(self, parent, *args, **kwargs)

        self.mCurValue = ''

        self.Bind(wx.EVT_CHAR, self.onChar)
        self.Bind(wx.EVT_TEXT, self.onChange)

    def dontAllow(self):
        self.SetValue(self.mCurValue)

    def onChar(self, event):
        self.mCurValue = self.GetValue()
        event.Skip()

    def onChange(self, event):
        '''
        override with validator
        '''
        pass