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wxPython Application Development Cookbook

You're reading from   wxPython Application Development Cookbook Over 80 step-by-step recipes to get you up to speed with building your own wxPython applications

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781785287732
Length 264 pages
Edition 1st Edition
Languages
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Author (1):
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Cody Precord Cody Precord
Author Profile Icon Cody Precord
Cody Precord
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Toc

Table of Contents (12) Chapters Close

Preface 1. wxPython Starting Points FREE CHAPTER 2. Common User Controls 3. UI Layout and Organization 4. Containers and Advanced Controls 5. Data Displays and Grids 6. Ways to Notify and Alert 7. Requesting and Retrieving Information 8. User Interface Primitives 9. Creating and Customizing Components 10. Getting Your Application Ready for Release Index

Validating user input


There may be times where you need to validate the input of a field before accepting a value from users. This validation could be done manually in the close handler for the dialog, but this leads to lots of duplicated and specialized code that would need to be copied to other dialogs. In order to help avoid this and provide a common way of validating user input, the wxPython library provides a Validator API that allows you to create custom Validator objects that can be assigned to controls. When a dialog's Validate method is called, all child controls of the dialog have their validation methods called as well to validate the input. In this recipe, we will discuss how to make a custom validator that can be used in TextCtrl.

How to do it…

Perform the following steps:

  1. First, we will create a subclass of wx.PyValidator to implement our field-checking logic:

    class InputValidator(wx.PyValidator):
        def __init__(self, checker = lambda s: s):
            super(InputValidator, self...
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