On 10/12/2009, at 10:26 PM, Gustavo Pizano wrote:
> In fact the AbstractFactory has nothing to do with the NSPasteBoard. Im
> reading the NSPasteBoard in the NSViewController after it's view has recevied
> the performDropOperation:
Yes, but my point was that AbstractFactory is your code, and yours alone, so
whether it will directly accept objects returned from the pasteboard's methods
is known only to you, so it's not a question anybody else can answer.
> NSArray * types = [pb types];
> if([types containsObject:DefaultHorizontal]){
You shouldn't be looking for what types the pasteboard has like this. You
should be asking it whether it has the types you want, in the order you want
them, using -availableTypeFromArray:
Given those types something will have to map those to the classes your abstract
factory makes. A bunch of if...else clauses is one way, but there smarter ways,
like having a dictionary that maps type -> class.
e.g.
NSString* myType = [pb availableTypeFromArray:[NSArray
arrayWithObjects:@"first_choice", @"second_choice", nil]];
Class theClass = [classMapDictionary objectForKey:myType];
if( theClass )
{
id object = [[theClass alloc] init];
}
If you are targeting 10.6 or later, the pasteboard supports multiple objects
and there are new APIs to get them. But for 10.5 and earlier, the pasteboard
can only hold one object, albeit in a different number of representations. If
the data is private to your app, you can get around that by passing an array of
objects in some fashion, but for data passed between apps, you're pretty much
stuck with the standard types unless yours and the other app agree on some
common protocol.
But to get back to your original post - anything you see on the pasteboard you
don't recognise is none of your business - it's probably data private to the
app where the drag started.
--Graham
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