Re: NSMatrix dragging

FROM : Dustin Sallings
DATE : Fri Nov 01 17:52:01 2002

Around 16:15 on Nov 1, 2002, Steve Dekorte said:

# I need to implement a custom dragging behavior in a subclass of
# NSMatrix but the mouseDragged: method never seems to get called.
# mouseDown: gets called, but never
# mouseDragged: or mouseUp:. Is there a secret to overriding dragging
# behavior on an NSMatrix?

   Yeah, it's just a bit more complicated than that if you're doing
what I think you're doing.  I'll describe to you what I remember about
what I did, and you can go from there.  Please ignore if this is unrelated
to what you're doing.  :)

   You have to implement

   - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender

   And return a proper value before dragging will be enabled.  Here
is the implementation I'm using for dropping files into my matrix:

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
{
    NSDragOperation sourceDragMask = [sender draggingSourceOperationMask];
    if (sourceDragMask & NSDragOperationLink) {
        return NSDragOperationLink;
    } else if (sourceDragMask & NSDragOperationCopy) {
        return NSDragOperationCopy;
    }
    return NSDragOperationNone;
}

   When I'm ready to deal with what was dragged (a list of files), I
do this (performDragOperation in my case):

-(BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
    NSPasteboard *pboard=[sender draggingPasteboard];
    NSArray *files = [pboard propertyListForType:NSFilenamesPboardType];
   [...stuff with files];
    return (TRUE);
}


--
SPY                      My girlfriend asked me which one I like better.
pub  1024/3CAE01D5 1994/11/03 Dustin Sallings <<email_removed>>
|    Key fingerprint =  87 02 57 08 02 D0 DA D6  C8 0F 3E 65 51 98 D8 BE
L_______________________ I hope the answer won't upset her. ____________