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Re: WebEvents-ISSUE-9: Interaction of touch events and mouse events [Touch Events spec]

From: Arthur Barstow <art.barstow@nokia.com>
Date: Mon, 04 Apr 2011 14:09:03 -0400
Message-ID: <4D9A093F.1090709@nokia.com>
To: Anders Höckersten <andersh@opera.com>, "public-webevents@w3.org" <public-webevents@w3.org>
Ooops - I meant Anders (not Sangwhan).

On Apr/4/2011 2:00 PM, ext Arthur Barstow wrote:
> Hi All,
> Below, Matt proposes a solution. If anyone disagrees, please speak up; 
> otherwise, I think we should consider Matt's proposal as agreed (and 
> he can implement his proposal in the spec).
> Sangwhan - I also copied your response to this thread below. It 
> appears Matt's proposal is consistent with what you said. Please clarify.
> -Thanks, ArtB
> On Apr/2/2011 10:09 AM, ext Matt Brubeck wrote:
>> On 03/28/2011 01:22 PM, Benjamin Poulain wrote:
>>>  From my experience on the issue with Qt on Windows 7, this mixing of
>>> mouse event and touch event make it impossible to do anything useful
>>> with the page.
>>> The best solution I had was to discard the mouse event generated by the
>>> platform for the touch event. This way the touch and mouse on the same
>>> computer work as expected.
>> I agree.  In order to support this technique, I think the Touch 
>> Events spec should at least specify:
>> "If the user agent dispatches both touch events and mouse events in 
>> response to the same user action, then the 'touchstart' event must be 
>> dispatched before any mouse events for that action."
>> This allows content to support both mouse and touch events, and 
>> switch between them dynamically in a clean way.  (For example, this 
>> would allow our own test suite to detect non-touch-aware browsers.)  
>> It is also compatible with existing implementations.  Any objections?
> On Mar/29/2011 4:39 AM, ext Anders Höckersten wrote:
> > On Mon, 28 Mar 2011 18:44:07 +0200, Matt Brubeck 
> <mbrubeck@mozilla.com> wrote:
> >
> >> There is a related issue on browsers that support both touch and 
> mouse input - for example, Firefox 4 on Windows 7 tablets.
> >>
> >> On platforms like Windows, the operating system may translate touch 
> input into mouse movements.  This means that, instead of one 
> "mousemove" event happening after the "touchend" event, mousemove 
> events and touchmove events are interleaved.  (Maybe these mouse 
> events should be suppressed if preventDefault() is called on one or 
> more of the touch events?)
> >>
> >> [removed text Matt left in by mistake]
> >>
> >> I'm not yet clear enough about this problem to enter any issues in 
> Track, but I'd like to hear other thoughts.
> >
> > I can add that QT also has this behavior of sending both mouse 
> events and touch events, at least on some systems[1].
> >
> > I'm leaning towards wanting to ignore system mouse events that are 
> generated for touch events, and let the browser handle emulation of 
> mouse events by itself. The reason is that I don't see why website 
> makers should have to worry about the specific touch/mouse behavior of 
> different OSes (beyond having to cater to both touch and mouse 
> separately, of course), but perhaps I'm missing something here?
> >
> > /Anders
> >
> > [1] 
> http://doc.trolltech.com/latest/qtouchevent.html#mouse-events-and-the-primary-touch-point
Received on Monday, 4 April 2011 18:09:47 UTC

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