On 2010 Jan 18, at 09:14, Jerry Krinock wrote:
> - (BOOL)isDocumentEdited
> {
> return (_changeCount > 0) ;
> }
>
> Am I correct?
No, I was wrong. After getting the ivar offset from otool, I poked around with
gdb and found that _changeCount can actually be negative. This occurs if you
do several edits, save the document, then start Undoing. Exactly as specified
by -updateChangeCount documentation, the _changeCount decrements, to -1, -2,
etc.
The behavior does seem to be
- (BOOL)isDocumentEdited
{
return (_changeCount != 0) ;
}
I also confirmed another undocumented fact that I suspected, which is that
sending -updateChangeCount:NSChangeRedone causes changeCount to increment.
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