Re: general undo methods?

Sat, 19 Feb 2005 10:29:28 -0800

I would store a list of transcript statements designed to undo/redo the things you are doing. So if you move a rectangle to 100,300 I would get the long id of the rectangle and do something like this:

put "set the loc of" && it && "to" && tNewLoc & cr after gRedoString
put "set the loc of" && it && "to" && the loc of it & cr before gUndoString
set the loc of it to tNewLoc

I did something like this for fields and found it to be remarkably fast and efficient. The really great aspect is that you can undo/redo an arbitrary number of steps with one command: do line 1 to 100 of gUndoString undoes 100 steps, etc.

On Feb 18, 2005, at 1:40 PM, Richard Gaskin wrote:

I can see how that approach would be useful for some apps, but this one has a large stack and the changes made a very small (moving objects, deleting objects, etc.).


regards,

Geoff Canyon
[EMAIL PROTECTED]

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