general undo methods?

Dar Scott dsc at swcp.com
Sun Feb 20 14:15:25 EST 2005


On Feb 18, 2005, at 1:53 PM, Richard Gaskin wrote:

> Any of you have pointers to general methods for implemening undo 
> across an app?

In a simple case, I have each undoable action push a line onto the end 
of a bunch of lines in a global.  For an undo, the code simply pops the 
line and gives it to 'do'.

To keep from getting confused, I put each undoable action in a handler 
with a name, say 'abc' and it uses the handler 'undoAbc' in the line 
pushed onto the end of the undo list.

Dar

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