Re: NSDragOperationDelete
Re: NSDragOperationDelete
- Subject: Re: NSDragOperationDelete
- From: Brian Webster <email@hidden>
- Date: Mon, 7 Oct 2002 14:39:53 -0500
I don't think the dock can really be considered either a Carbon or a
Cocoa app, since it is pretty specialized, although it doesn't appear
to use Cocoa at all (class-dump reveals it has no Objective-C classes),
so I guess one would call it a Carbon app. There is actually a
(private) common layer that sits underneath both the Carbon and Cocoa
dragging mechanisms, and I'm pretty sure that the Dock just uses that.
The problem is that there is nothing present in the Cocoa layer that
lets you access the trash functionality that exists in the lower layer.
On Monday, October 7, 2002, at 02:27 PM, Steve Gehrman wrote:
Is the Dock written in Cocoa? If so, it must be doing something to
communicate with the Finder to indicate a delete.
On Monday, October 7, 2002, at 07:14 AM, Brian Webster wrote:
On Monday, October 7, 2002, at 12:00 AM,
email@hidden wrote:
The problem is that if I drag a file from the Finder, the Finder does
nothing. The Finder should do something similar to my draggedImage
call
and see that the drag operation is NSDragOperationDelete and move the
file to the trash.
I believe this is because the Carbon drag manager uses a somewhat
different paradigm when it comes to deleting files. There isn't
really a separate "delete" operation, but it is instead treated as a
file move, but applications are supposed to check to see if the file
(or other object) is being moved to the trash, and if it is, act
appropriately. The trash can in the dock will return the trash
folder as the drop location and the Finder responds by moving the
dragged files to the trash. Unfortunately, there doesn't appear to
be any mechanism in Cocoa to do this.
That being said, I think you should think twice about creating an
exact duplicate of a standard interface element such as the trash
can, unless you're making some sort of dock replacement or something
along those lines.
--
Brian Webster
email@hidden
http://homepage.mac.com/bwebster
--
Steve Gehrman
email@hidden
http://www.cocoatech.com
--
Brian Webster
email@hidden
http://homepage.mac.com/bwebster
_______________________________________________
cocoa-dev mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/cocoa-dev
Do not post admin requests to the list. They will be ignored.