A few other alternatives come to mind:
- archive an identifier value that uniquely identifies the object you
are dragging or
- use and archive an instance of NSValue using the valueWithPointer:
initializer.
<http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSValue_Class/Reference/Reference.html#//apple_ref/occ/clm/NSValue/valueWithPointer:
>
NSValue conforms to the NSCoding protocol, you should be able to use
NSKeyedArchiver to archive an instance of NSValue, write the archive
to the pasteboard and unarchive it at your dragging destination using
NSKeyedUnarchiver.
Kiel
On 15/10/2009, at 11:35 AM, Rick Mann wrote:
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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