[wxPython-users] Re: Custom validator

[Paul Koning]

>>>>> "Robin" == Robin Dunn <robin at alldunn.com> writes:

 Robin> Basil Shubin wrote:
 >> Hi,
 >> 
 >> Phil Mayes ÐÉÛÅÔ:
 >>>  Try: FLOAT = r'\d+\.\d+$'
 >>  Not exactly what it should be. The problem is that I want check
 >> all input char and 'allow' only digits, but all digits should fit
 >> the regex pattern. For checking where is pressed key correspond
 >> the digits, is to bind on wx.EVT_CHAR and than check if key is
 >> digit (it's showed in wxPython validator example). But I don't
 >> know how I can check the entire inputed string, so it fits regex
 >> pattern.

 Robin> Normally something like that would be done in the Validate
 Robin> method, but that is not called for every character, only when
 Robin> the dialog is completed.  You don't want to do it in the
 Robin> EVT_CHAR handler since the new char has not been inserted into
 Robin> textctrl yet.  But you could use wx.CallAfter from there to
 Robin> cause a method to be called after the character has been
 Robin> inserted, and from there you can get the value of the control
 Robin> and check it however you like.

Neat.

I found the behavior of validators surprising and unhelpful -- it
seems like unfriendly UI design to allow a user to enter bad data and
then complain afterwards.

For example, I have a text control where a user is expected to enter a
number.  The rational behavior is to ignore non-numeric keystrokes,
and I foolishly expected a validator to be able to do that.  No such
luck.  But now I know how to get that effect.  Thanks!

       paul