On 11 Feb 2012, at 03:17, Quincey Morris wrote:
> On Feb 10, 2012, at 15:03 , Mike Abdullah wrote:
>
>> My line of thinking:
>>
>> Each time one of your undo managers is about to close its top-level group,
>> register that with the doc's main undo manager. Thus the doc's undo manager
>> will see the change while locked, prompt the user to unlock, and if they do
>> choose to cancel, will undo the change to individual undo manager. Something
>> like:
>>
>> - (void)undoManagerWillCloseGroup:(NSNotification *)notification
>> {
>> NSUndoManager *manager = [notification object];
>> if ([manager groupingLevel] == 1)
>> {
>> [[[self document] undoManager] registerUndoWithTarget:manager
>> selector:@selector(undo) object:nil];
>> }
>> }
>
> Won't this have the effect of causing successive undos to affect various
> pages, according to the order things were originally done, rather than just
> undoing within the current "page"? That is, won't it undo on a global
> "timeline" rather than a per-page timeline?
I'm assuming the doc's undo manger is hidden from the user; that there's no way
from the UI to make it undo/redo.
>
> I don't recall that this was discussed, but what happens if the document's
> undo manager is changed to the page undo manager every time page switch
> occurs? I can't work out if the OP tried this and found that the document's
> "edited" status doesn't capture the undo manager states properly, or if the
> OP didn't try this.
In theory I reckon that could work. Not sure I'd trust the framework to accept
a regularly changing undo manager enough though.
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