Re: yearly NSDraggingInfo -draggedImage question (BEWARE!)
Re: yearly NSDraggingInfo -draggedImage question (BEWARE!)
- Subject: Re: yearly NSDraggingInfo -draggedImage question (BEWARE!)
- From: Nathan Vander Wilt <email@hidden>
- Date: Thu, 20 Mar 2008 16:09:43 -0700
On Mar 20, 2008, at 3:31 PM, Dave Hersey wrote:
Do you get anything different if you print the object as a pointer
(%p)? Printing it as an int value is... weird.
Try:
printf("Dragged Image: %p\n", (void *)[sender draggedImage]);
That's a useful format I'd either forgotten or never known, thanks! I
was just casting to an int to get rid of the warning for the hex,
though. (In C casts are pretty weak.) Now from all three methods I
always get:
Dragged Image: 0x0
...which is prettier, but still doesn't explain why the return value
is always nil. Or why Sherm's car wouldn't start.
If this is a bug, it seems to have been around since before 2004. (See
list of unanswered links in OP.) If it's a documentation omission,
nobody seems to know what the docs *should* say, also since 2004. If
it's user error, I'll still blame the docs, but at least I can make my
bug report better!
Maybe this would be a better way of asking:
What is the NSDraggingInfo protocol's -draggedImage method supposed to
return, and under what circumstances?
thanks,
-natevw
On Mar 20, 2008, at 6:15 PM, Nathan Vander Wilt wrote:
...
I subclassed an NSImageView to turn it into a dropbox to help me
prototype a file-opening feature.
I implemented the following method in my DropBox class:
- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender {
printf("Dragged Image: %x\n", (NSUInteger)[sender draggedImage]);
return NSDragOperationLink;
}
When I hover any file/folder from the Finder over this drop box, I
get:
Dragged Image: 0
in the debugging console. Likewise if I check it in my prepare/
performDragOperation, this value is always nil.
The documentation says nothing about this method ever returning
nil, so it's even more suprising to me that it would *always*
return nil. I would expect it to give back a reference to the file/
folder icon image that I'm dragging around underneath the cursor.
Is that not what this method is documented to do?
thanks,
-natevw
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