On 19 Apr 2013, at 21:04, Steve Mills <smi...@makemusic.com> wrote:
> On Apr 19, 2013, at 14:37:11, Mike Abdullah <cocoa...@mikeabdullah.net> wrote:
>
>> Why, what's wrong with cancelling a save?
>
> It just seems icky. Who knows what behavior this will cause in the future? I
> just tried this approach, and it works the same as when I tried returning NO
> from hasUnautosavedChanges; it successfully prevents the autosave from
> happening, but then no other autosaves happen after that. I have to
> completely close the document and reopen before autosaves happen again. I
> even tried reverting with no luck. This leads me to believe that the autosave
> dirty state is getting out of whack if the save doesn't happen as planned.
> Any ideas?
Well that's odd. As an experiment, I whacked this into my NSDocument subclass:
- (BOOL)writeToURL:(NSURL *)inURL
ofType:(NSString *)typeName
forSaveOperation:(NSSaveOperationType)saveOp
originalContentsURL:(NSURL *)originalContentsURL
error:(NSError **)error
{
if (self.autosavingIsImplicitlyCancellable)
{
NSLog(@"Cancelling autosave");
if (error) *error = [NSError errorWithDomain:NSCocoaErrorDomain
code:NSUserCancelledError userInfo:nil];
return NO;
}
I opened a document, made a change, then left it idling. I can see in the
console a steady procession of "Cancelling autosave" messages, roughly every 15
seconds. So if I were to make the cancellation conditional on something else as
well, such as whether playback is in progress, I'd expect it to work properly.
Seriously, Apple's engineers put this system in for a reason. As best I can
tell, that reason is cases like yours.
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