Re: Can I make custom pasteboard type for an object reference?
Re: Can I make custom pasteboard type for an object reference?
- Subject: Re: Can I make custom pasteboard type for an object reference?
- From: Rick Mann <email@hidden>
- Date: Wed, 14 Oct 2009 17:35:37 -0700
That's the kind of thing I'm trying to avoid. There's no need to do
that, since the drag is only within my app. I just want the drag
receiver to have access to a *point* to the object, not a new copy of
the object.
On Oct 14, 2009, at 17:34:06, Kiel Gillard wrote:
You could archive and unarchive your object as data using
NSKeyedArchiver and NSKeyedUnarchiver.
<http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Archiving/Tasks/creating.html#//apple_ref/doc/uid/20000949
>
<http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Archiving/Tasks/codingobjects.html#//apple_ref/doc/uid/20000948
>
Kiel
On 15/10/2009, at 11:21 AM, Rick Mann wrote:
I'm trying to implement a library like Interface Builder's. When
the user drags an item out of the library and onto one of my custom
views, it should instantiate an object and place it in the view
accordingly.
I'm trying to implement the drag by writing to the pasteboard an
NSData object I create that contains a reference to the object,
like so:
- (BOOL)
collectionView: (NSCollectionView*) inCollectionView
writeItemsAtIndexes: (NSIndexSet*) inIndices
toPasteboard: (NSPasteboard*) inPasteboard
{
MyObject* foo = self.myFoo;
if (foo != nil)
{
[inPasteboard declareTypes: [NSArray arrayWithObject:
kUTIMyObjectRef] owner: nil];
[inPasteboard writeObjects: [NSArray arrayWithObject: plugIn]];
return YES;
}
return NO;
}
In MyObject:
- (NSArray*)
writableTypesForPasteboard: (NSPasteboard*) inPasteboard
{
static NSArray* types = nil;
if (types == nil)
{
types = [NSArray arrayWithObjects: kUTIMyObjectRef, nil];
}
return types;
}
- (id)
pasteboardPropertyListForType: (NSString*) inType
{
if ([inType isEqualToString: kUTIMyObjectRef])
{
NSMutableData* data = [NSMutableData data];
[data appendBytes: &self length: sizeof (self)];
return data;
}
return nil;
}
+ (NSArray*)
readableTypesForPasteboard: (NSPasteboard*) inPasteboard
{
static NSArray* types = nil;
if (types == nil)
{
types = [NSArray arrayWithObjects: kUTIMyObjectRef, nil];
}
return types;
}
But nowhere do I see a way to turn that NSData into an object
reference, and I'm pretty sure I'm not implementing
pasteboardPropertyListForType: correctly, anyway (I mimicked what I
saw in the docs).
Am I just going about this all the wrong way?
TIA,
Rick
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