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Re: Undo capabilities on top of EOF
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Re: Undo capabilities on top of EOF


  • Subject: Re: Undo capabilities on top of EOF
  • From: Ken Anderson <email@hidden>
  • Date: Sun, 27 Jan 2008 15:11:46 -0500

Florijan,

You can always look at see what EOF puts on the undo stack for whatever operation you want to undo - that would be the easiest way to identify the 'right way' to undo things.

Is this just an exercise? Do you have a goal for wanting to use something other than NSUndoManager ?

Ken

On Jan 27, 2008, at 2:03 PM, Florijan Stamenkovic wrote:

Hi all,


Here's a question: has anyone ever tried implementing undo / redo support for EOF, that is not based on the NSUndoManager? Or, can one estimate if it is even possible, I am just trying to think about the possibilities and pitfalls... Here are a few specific questions:


1. Inserting records, then un-inserting and re-inserting them... Could the same EOs be used? Would the ec flip? Would the object graph roll back to the same state, regardless of the deletion rules of relationships of the inserted object?
2. Same questions about deleting records.
3. Could relationship editing be undone and redone by simply applying reverse actions? Would EOF accept that without problems?


Would it be better to simply ignore insertion and deletion, and focus only on the editing? Anything else that might be a problem that I've missed?

Thanks for any thoughts,
Flor
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      • From: Florijan Stamenkovic <email@hidden>
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 >Undo capabilities on top of EOF (From: Florijan Stamenkovic <email@hidden>)

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