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Python GUI Programming with Tkinter
book

Python GUI Programming with Tkinter

by Alan D. Moore
May 2018
Beginner to intermediate content levelBeginner to intermediate
452 pages
11h 26m
English
Packt Publishing
Content preview from Python GUI Programming with Tkinter

Updating ValidatedMixin

Now that we're working with all Ttk widgets, we can update our ValidatedMixin class with some dynamic styling.

We'll begin in the __init__() method by creating a Style object:

   style = ttk.Style()

Since this is a mixin class, we don't know the original style name of the widget we're mixing with, so we'll have to fetch that.

Remember that we can do this with winfo_class():

       widget_class = self.winfo_class()
       validated_style = 'ValidatedInput.' + widget_class

After getting the widget class, we're creating a derivative style by prepending ValidatedInput to it. In order to toggle our input appearance between error and non-error appearances, we'll create a style map that switches with the state of the invalid state flag. ...

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Publisher Resources

ISBN: 9781788835886Supplemental Content