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[racket] how to add text-field-style behavior to rectangles drawn on a canvas

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Wed Oct 5 09:02:01 EDT 2011		 
At Wed, 05 Oct 2011 15:00:06 +0200, Marijn wrote:
> Suppose one has a spreadsheet-like grid drawn on a canvas%. How does
> one add text-field%-style behavior to the rectangles drawn?

You could implement an `editor-admin%' subclass to manage a `text%'
within the grid.
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