Re: Suggest reasons for this crash?
Re: Suggest reasons for this crash?
- Subject: Re: Suggest reasons for this crash?
- From: Graham Cox <email@hidden>
- Date: Wed, 7 Oct 2009 15:55:13 +1100
On 07/10/2009, at 3:37 PM, Kyle Sluder wrote:
I can't imagine the
usefulness of replacing the contents of the text storage instead of
just swapping in the new one.
I do this because previously I was replacing the text storage and that
was causing a huge amount of upset for Undo, producing a crash deep
inside the undo manager for a private object it maintains.
(Essentially, the target for a text editing undo operation is the text
storage, so if it's replaced the reference is stale, since Undo tasks
do not retain their targets). In fact I recall that it was you who
suggested that using -replaceTextStorage: would cause problems for
Undo and suggested replacing the content instead. Indeed, that did
seem to eradicate that particular source of problems. I didn't try it
but -setTextStorage: would presumably have the same effect on Undo,
making it unsafe.
However, there were other problems anyway so I ended up disabling Undo
for typing when the text is being edited. I'd like to be able to re-
enable it at some point but I can't see a very nice way to consolidate
the two "phases" for Undo - typing, then just getting the typed text
and setting it back into my data model, which is also undoable. At
that point the undos relating to typing should be removed from the
undo stack but I can't find a stable way to do that, hence disabling
Undo for typing altogether.
http://www.cocoabuilder.com/archive/message/cocoa/2009/9/16/245160
--Graham
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