[Bug 20872] New: PREVENT MOUSE EVENT flag should be per pointer type

https://www.w3.org/Bugs/Public/show_bug.cgi?id=20872

            Bug ID: 20872
           Summary: PREVENT MOUSE EVENT flag should be per pointer type
    Classification: Unclassified
           Product: PointerEventsWG
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Pointer Events specification
          Assignee: jrossi@microsoft.com
          Reporter: jrossi@microsoft.com
        QA Contact: public-pointer-events-bugzilla@w3.org
                CC: public-pointer-events@w3.org

> Upon re-reading the current draft, I have a few questions.
> 
> 1. At any point in time, how many pointers can simultaneously have isPrimary
set to true? The way I read it, there could be up to three, one for a mouse
device, one for a touch input, and one for a pen input, if the underlying
platform supports all three input types simultaneously. Is that correct?

Correct. Generally, users don't mix input simultaneously. In IE10, multiple
primary pointers effectively "fight" for a mouse cursor (e.g. you'll see
mousemove events firing back and forth between the two locations).

> 2. If my understanding in #1 is correct, then in "8.1 Mapping for devices
that support hover", there should be *three* different PREVENT MOUSE EVENT
flags, one for each input type. Otherwise, cancelling the pointerdown event
of the primary touch input would inadvertently disable the compatibility
mouse events for subsequent events from the primary mouse and pen inputs as
well.

Though I think I'll update this to say "set the PREVENT MOUSE EVENT flag for
this pointer type" and "if the PREVENT MOUSE EVENT flag is set for this pointer
type." That way the principle applies if new device types are added.

http://lists.w3.org/Archives/Public/public-pointer-events/2013JanMar/0057.html

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Received on Tuesday, 5 February 2013 04:13:33 UTC