[Urwid] detecting when an edit box has changed

[Ian Ward]

Eric S. Johansson wrote:

> is there any way to detect when an edit box has changed short of 
> comparing against some "original" data source?

You can hook its keypress() function and check if it returned None 
(which means that the key was handled by the edit widget. To do that you 
can either subclass the Edit widget or the WidgetWrap class to define 
your own keypress function.

HTH,
Ian