Allowing TABs in Char Validator - python-2.7

Question

Currently I have a data input screen where the user has to navigate between input fields using the mouse. I would like to add a TAB facility so that they can TAB between input fields, e.g. Last Name → First Name → DOB, etc. The input screen makes use of Validators to prevent users inputting nonsense:-
def OnChar(self, evt):
key = chr(evt.GetKeyCode())
if ord(key) in [wx.WXK_BACK, wx.WXK_DELETE]:
evt.Skip()
if self.flag == LETTERS and key not in string.letters:
return
if self.flag == DECIMAL_DIGITS and key not in string.digits:
return
if self.flag == HEX_DIGITS and key not in string.hexdigits:
return
if self.flag == ALPHA_NUMERIC and key not in string.printable:
return
evt.Skip()
I have added:-
style=wx.TAB_TRAVERSAL | wx.DEFAULT_DIALOG_STYLE
to the Frame. However the Validator traps the TABs. Is there a way to get around this problem?

Answer 1

Because you are converting the key to chr() it is not recognising wx.WXK_TAB see the following to demonstrate your problem:
#!/usr/bin/python
# -*- coding: utf-8 -*-
import wx
class Example(wx.Frame):
def __init__(self, parent):
wx.Frame.__init__(self, parent, wx.ID_ANY, "Tab Key Test",size=(310,120))
self.Stop_prog = False
self.top = wx.Panel(self, wx.ID_ANY)
self.sizer = wx.BoxSizer(wx.VERTICAL)
self.text_input = wx.TextCtrl(self.top, wx.ID_ANY, size=(300,25))
self.sizer.Add(self.text_input)
self.text_input.Bind(wx.EVT_KEY_DOWN, self.OnKey)
self.top.Sizer = self.sizer
self.top.Sizer.Fit(self.top)
self.Show()
def OnKey(self,event):
print "Key Pressed", event.GetKeyCode()
keycode = event.GetKeyCode()
try:
charkey = chr(event.GetKeyCode())
print "Character Key", charkey
except:
print "unable to convert key to a character in the range 256"
if keycode == wx.WXK_F1:
self.Close()
elif keycode == wx.WXK_TAB:
print "TAB"
self.text_input.SetValue("You pressed Tab")
else:
event.Skip()
def main():
ex = wx.App()
Example(None)
ex.MainLoop()
if __name__ == '__main__':
main()