[lazarus] Form editing: Undo/Redo

[Martyn Ranyard]

At 12:01 AM 6/20/02 +0200, Mattias Gaertner wrote:
>Hi all,
>
>I want to implement Undo/Redo for the form editing, but I'm not sure how 
>this should be done.
>Normally an undolist just keeps tracks of the changes. But for example 
>moving a control can result in changing other controls and many other 
>things. So, for a correct undo, one have to stream the form after every 
>move/resize/add/delete/change property operation. Or is there a better way?

Bear in mind that certainly in D5 and earlier, moving a control could not 
be undone, nor could creating one, only deletions were undoable.

Anything you do will almost certainly be better than Borland's "Ahh, it 
doesn't matter" attitude.

>Mattias

Martyn Ranyard
Free Software Advocate

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