On Aug 31, 2005, at 12:44 PM, Jeff LaMarche wrote:
I've got a view that's both a drag source and drag destination.
Dragging to and from other objects (where I've used delivered
pasteboard types like PBTIFFPboardType) works fine, dragging from
one of these views to another one of them, however, doesn't work.
What I've tried to do is to declare a custom Pasteboard type,
which I can use to copy all attributes between two views of the
same kind. Using the type seems to work - I'm able to put objects
on the pasteboard using it, and when I retrieve the list of types
from the pasteboard, the type shows up as available.
But no matter what I do, the object I put on the pasteboard
doesn't come through. It's an NSDictionary, and it's not nil, but
I get a nil object on the other end of the drag. This happens if I
use setPropertyList:forType: setData:forType: (archiving the data
with an NSKeyedArchiver) or setString:forType.
Can anyone think of what I might be doing wrong? Is it acceptable
to declare custom pasteboard types like this?
It doesn't sound like the custom pasteboard type is the
problem, but rather the data that is being added. Are all of the
sub objects in the NSDictionary you're serializing CFPropertyList
types or support the NSKeyedArchiver protocol? If not, then I'd
wager the serialization is failing and you're simply adding an
empty NSData to the pasteboard. Can you take a peek at that data
before placing it on the pasteboard to verify?
Also, if you want a working example of a custom pasteboard type used
for copy/paste and drag and drop, you can look at the iSpend example
at developer.apple.com.
Douglas Davidson
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