[Tkinter-discuss] Re: Problem with Text widget's "see" method

Fredrik Lundh fredrik at pythonware.com
Mon Feb 14 19:31:52 CET 2005

Jared Cohen wrote:

> I'm building a text editor that has an Undo/Redo feature. To do this, I basically invoke a 
> callback every time the user presses a key; the callback copies the entire contents of the Text 
> widget to a history list.

that's a bit more brute-force than it has to be; a better (but less
obvious) way is to "override" the insert and delete commands at
the widget implementation level.

see Lib/idlelib/Percolator.py for a helper class, and sample code
(the actual overriding is done in the WidgetRedirector.py module
in the same directory)

> Of course, the Text widget doesn't actually HAVE a method to explicitly
> set the position of the cursor

the cursor is represented by the INSERT mark, so

    text.mark_set(INSERT, position)

possibly followed by


should do the trick.


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