Re: NSUndoManager retain/release of arguments - ad infinitum
Re: NSUndoManager retain/release of arguments - ad infinitum
- Subject: Re: NSUndoManager retain/release of arguments - ad infinitum
- From: Uli Kusterer <email@hidden>
- Date: Fri, 14 Jan 2011 18:50:33 +0100
On Jan 11, 2011, at 7:35 AM, Jerry Krinock wrote:
> On 2011 Jan 10, at 21:39, Graham Cox wrote:
>
>> As suggested, to undo a sort, pass the old descriptors to the undo manager and when undo is invoked, it restores the old descriptors and once again invalidates the cache.
>
> But that assumes that the data was sorted with some old descriptors to begin with. It seems like this would not work if the objects had been manually arranged into some arbitrary order by the user.
Guys, why is sorting like this even an undo-able action in your apps ... ? That's pointless. Look at iTunes to see how you'd really do it: You'd have one column for the user-defined sort order (which conceptually contains an index by which you can sort that the user can change by dragging). So, to undo a sort, the user simply clicks another header.
The way Jerry seems to have it right now, if I simply click a list header, my carefully hand-crafted item order is irrevocably destroyed. I can at best undo it. Sort order/list headers are a view-specific attribute. They shouldn't affect the model.
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
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