# feel free to change/enhance/finish
== Input Value Checking and Transfer ==

wxPython provides a system of "Validators" and certain controls which are aware of Validators.  When available, these controls allow your system to use an approach similar to a DocumentViewArchitecture, where data is acquired and updated automatically from data objects by the UI elements.

Using Basic Validators
    wxValidator class and customisation points

    Value checking
        Informing the user of failures/warnings
        Focusing on the failing control

    Value transfer

    Binding validators to controls

Using validators with "non validator" controls
    Rewriting Transfer''''''Data''''''From''''''Window and Transfer''''''Data''''''To''''''Window

Recursive validation (automatically validating child windows)
    ''Currently broken''

Limitations and coverage
    Only available automatically in wxDialog subclasses (need to write something to call Validate, and Transfer if using another class).
    (Re-)writing dialog close/update methods to handle mixed Validator/non-validator controls
    

=== Example ===

(Re-)writing dialog close/update methods to handle mixed Validator/non-validator controls

    Note that the following is untested (copied from working code and modified in the documentation).  ''should test''

{{{
	def Validate( self, event ):
		'''Process an event for the okay button...'''
		# do validation for normal "Validator" controls
		if not wxWindow.Validate( self ):
			return false
		# now walk through the other controls (
		for editor in self.controls:
			if hasattr( editor, 'Validate') and not editor.Validate( self ):
				return false
        def TransferDataFromWindow( self, ):
		if not wxWindow.TransferDataFromWindow( self ):
			return false
		for editor in self.controls:
			if hasattr( editor, 'TransferDataFromWindow'):
				if not editor.TransferDataFromWindow():
					return false
        def TransferDataToWindow( self, ):
		if not wxWindow.TransferDataToWindow( self ):
			return false
		for editor in self.controls:
			if hasattr( editor, 'TransferDataToWindow'):
				if not editor.TransferDataToWindow():
					return false

}}} 

=== Display ===
xxx