[whatwg] More questions about the DnD API

Daniel Cheng dcheng at google.com
Tue Mar 30 12:41:50 PDT 2010

On Tue, Mar 30, 2010 at 2:54 AM, Stef Epardaud <stef at epardaud.fr> wrote:

> On Tue, Mar 30, 2010 at 02:33:07AM -0700, Daniel Cheng wrote:
> >      But what was the rationale for preventing key events while doing
> DnD?
> >
> >    I'm not 100% sure, but I'm assume it's so that the process of dragging
> and
> >    dropping doesn't trigger unrelated mouse / keyboard listeners.
> Unrelated yes, but that also prevents applications from adding DnD
> functionality based on key presses.
> >      Why not make the implied drag and/or dragstart explicitely fired
> when
> >      external applications start DnD in the browser? That might make it
> >      simpler and more consistent.
> >
> >    Because those events are intended for a source node. It introduces
> several
> >    new problems (which node should get the event? how do authors
> differentiate
> >    between the two different types of dragstart?) without really solving
> >    anything that isn't already handled by other events. If you have drop
> >    targets in your page, you don't really care about a drag and drop
> operation
> >    in progress unless the item is dragged over your page--at which point
> one
> >    can simply use dragenter / dragover / dragleave.
> How about registering the drag/dragstart on window.external?
> So you're saying that if I start dragging from a document element (say a
> div) and from an external application over the document, in both cases a
> dragenter listener registered on the body element should get fired even
> when the drag is currently over a descendent of the body?
> Same for dragleave when the drag is finished or the drag went out of the
> browser window (to other external apps for example)?
> If so, then I can live with this.

Yep, as long as event propagation is not stopped.

> --
> Stéphane Epardaud
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.whatwg.org/pipermail/whatwg-whatwg.org/attachments/20100330/07a7f4cd/attachment-0002.htm>

More information about the whatwg mailing list