Implementing UNDO

Klaus major-k klaus at
Fri May 21 09:19:12 EDT 2021

Hi Craig,

> Am 21.05.2021 um 15:12 schrieb Craig Newman via use-livecode <use-livecode at>:
> Klaus.
> What are you doing here on the dark side??

Oh, come on!

> Do you mean something like this, with a field and a button?  in the card script:
> on textChanged
> set the currentText of this cd to fld 1
> end textChanged
> on undoText
> get the currentText of this cd
> delete the last word of it
> set the text of fld 1 to it
> set the currentText of this cd to it
> end undoText
> and in the button:
> on mouseUp
>  undoText
> end mouseUp

OK, something like this, but for graphics, images etc., too. 8-)
Some general hints will be OK. 

Except for TEXT I don't have a clue yet.
Maybe store "the properties of xyz" and re-apply them when the user hits CMD-Z?

> Craig
>> On May 21, 2021, at 7:48 AM, Klaus major-k via use-livecode <use-livecode at> wrote:
>> Hi friends,
>> any hints on how to implement some UNDO mechanism into a LC standalone? 
>> The stack(s) in question will not only handle TEXT...



Klaus Major
klaus at

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