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RE: SVG12: wheelDelta should be UIEvent.detail

From: Scott Hayman <shayman@rim.com>
Date: Tue, 8 Aug 2006 14:39:36 -0400
Message-ID: <1CA55DCF91707745A9B5091A303367E90648529F@XCH43YKF.rim.net>
To: "Bjoern Hoehrmann" <derhoermi@gmx.net>
Cc: <www-svg@w3.org>

> From: Bjoern Hoehrmann [mailto:derhoermi@gmx.net] 

> * Scott Hayman wrote:
> >It seems odd to me, and here I am speaking on my own behalf and not 
> >that of the WG, that an event that inherits from MouseEvent could 
> >re-use the 'detail' attribute for something other than what it is 
> >specified for by MouseEvent.  I would think that this would be more 
> >confusing than introducing a new attribute.
> In DOM Level 2 Events, only three mouse event types use 
> UIEvent.detail, click, mouseup, and mousedown. For all three 
> event types UIEvent.detail reflects the same information; in 
> order to avoid stating this for all three event types, the 
> specification just says once that if it is used, then like 
> this. The text there is not meant to establish a relationship 
> between the MouseEvent interface and UIEvent.detail.

Thanks very much for the clarification.

> >So the 'detail' attribute of MouseEvent in the DOM Level 3 
> Events spec 
> >no longer contains the information about the number of 
> button presses?
> >Isn't this a backwards compatibility issue?
> There is no change, UIEvent.detail is still in use for click, 
> mouseup, and mousedown, and not in use for e.g. mousemove. If 
> some event object for a mousemove event in some 
> implementation specifies the number of mouse button presses 
> and releases, then that implementation operates outside of 
> what is specified in the DOM Events specification. I do not 
> think this is particularily confusing, it is not important for e.g.
> the mousemove event to inform about the number of clicks, but 
> it might be useful if it would carry information about, say, 
> the direction of the move, the current device velocity, or 
> what mouse gesture is being performed, a fixed relationship 
> between the MouseEvent interface and UIEvent.detail is 
> neither needed nor useful, so it's not there.

OK, I will bring this information back to the SVG WG to discuss the
possibility of using UI.detail for the wheel delta information.

Thanks again for your help in understanding this issue.


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Received on Tuesday, 8 August 2006 18:39:57 UTC

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