Just a small hint to another project:
https://www.hpi.uni-potsdam.de/hirschfeld/trac/SqueakCommunityProjects/wiki/widgets

There is a widget that can convert input using a block:

UiLineEdit new
	helpText: 'Enter number here...';
	converter: [:txt | txt select: [:char | char isDigit]];
	autoConvert: true;
	openInHand.

Basically, it is implemented with a TextMorph that is converting the
resulting text after each #keyStroke:. :)

Best,
Marcel



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