On Oct 9, 2014, at 13:44 , Matthew LeRoy <[email protected]> wrote:
> so -[NSDocumentController beginOpenPanelWithCompletionHandler:] is what I
> would be using.
> Hmm, OK. So where do I provide the custom completion handler?
Ah, I see, I thought you were already *providing* a completion handler
somewhere, but I guess you’re not. In that case, I think you would override
-[NSDocumentController
openDocumentWithContentsOfURL:display:completionHandler:], like this:
- (void)openDocumentWithContentsOfURL:(NSURL *)url
display:(BOOL)displayDocument completionHandler:(void (^)(NSDocument*document,
BOOL documentWasAlreadyOpen, NSError *error))completionHandler {
if ([self typeForContentsOfURL: url …] != myOldType
[super openDocumentWithContentsOfURL: url display:
displayDocument completionHandler: completionHandler];
else
dispatch_async (dispatch_get_main_queue (), ^{
[SomeClass verifyPasswordForURL: url
completionHandler: ^(NSError* error) {
if (error == nil)
[super
openDocumentWithContentsOfURL: url display: displayDocument completionHandler:
completionHandler];
else if (completionHandler != nil)
completionHandler (nil, NO,
error);
}];
});
}
Just make sure that the password verification (which is invoked on the main
thread) doesn’t eventually invoke its completion handler on a background thread
— or if it must, then wrap the innermost if/else in another dispatch_async
(dispatch_get_main_queue (), …) block.
With this code (warning: written in Mail) you’re getting all the normal
document behavior, and reporting a password verification failure through the
normal document mechanism.
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