Hi Kershaw,
Has there been any discussions with other browser vendors about this
API? Or is there an official standard somewhere for them?
If not, I don't think that we'll want to expose this to the web at
large. It would still be fine to expose to certified apps, or even to
expose to privileged apps under a permission.
Does this sound ok?
/ Jonas
On Wed, Sep 10, 2014 at 11:18 PM, Kershaw Chang <kech...@mozilla.com> wrote:
> Hi All,
>
> Summary:
> Touchpad(trackpad) is a common feature on laptop computers. Currently, the
> finger activities on touchpad are translated to touch event and mouse event.
> However, the coordinates of touch event and mouse event are actually
> associated to display [1]. For some cases, we need to expose the absolute
> coordinates that are associated to touchpad itself to the application.
> That's why AOSP also defines another input source type for touchpad [2]. The
> x and y coordinates of touchpad event are relative to the size of touchpad.
>
> Use case:
> Handwriting recognition application will be benefited from this touchpad
> event. Currently, OS X supports handwriting input by touchpad [3].
>
> Idea of implementation:
> The webidl of touchpad event is like touch event except that x and y
> coordinates are relative to touchpad rather than display.
>
> --- /dev/null
> +++ b/dom/webidl/Touchpad.webidl
> +
> +[Func="mozilla::dom::Touchpad::PrefEnabled"]
> +interface Touchpad {
> + readonly attribute long identifier;
> + readonly attribute EventTarget? target;
> + readonly attribute long touchpadX;
> + readonly attribute long touchpadY;
> + readonly attribute long radiusX;
> + readonly attribute long radiusY;
> + readonly attribute float rotationAngle;
> + readonly attribute float force;
> +};
>
> --- /dev/null
> +++ b/dom/webidl/TouchpadEvent.webidl
> +
> +interface WindowProxy;
> +
> +[Func="mozilla::dom::TouchpadEvent::PrefEnabled"]
> +interface TouchPadEvent : UIEvent {
> + readonly attribute TouchpadList touches;
> + readonly attribute TouchpadList targetTouches;
> + readonly attribute TouchpadList changedTouches;
> +
> + readonly attribute short button;
> + readonly attribute boolean altKey;
> + readonly attribute boolean metaKey;
> + readonly attribute boolean ctrlKey;
> + readonly attribute boolean shiftKey;
> +
> + [Throws]
> + void initTouchpadEvent(DOMString type,
> + boolean canBubble,
> + boolean cancelable,
> + WindowProxy? view,
> + long detail,
> + short button,
> + boolean ctrlKey,
> + boolean altKey,
> + boolean shiftKey,
> + boolean metaKey,
> + TouchPadList? touches,
> + TouchPadList? targetTouches,
> + TouchPadList? changedTouches);
> +};
>
> --- /dev/null
> +++ b/dom/webidl/TouchpadList.webidl
> +
> +[Func="mozilla::dom::TouchpadList::PrefEnabled"]
> +interface TouchpadList {
> + [Pure]
> + readonly attribute unsigned long length;
> + getter Touchpad? item(unsigned long index);
> +};
> +
> +/* Mozilla extension. */
> +partial interface TouchpadList {
> + Touchpad? identifiedTouch(long identifier);
> +};
>
> Platform converge: all
>
> Welcome for any suggestion or feedback.
> Thanks.
>
> [1]
> http://developer.android.com/reference/android/view/InputDevice.html#SOURCE_
> CLASS_POINTER
> [2]
> http://developer.android.com/reference/android/view/InputDevice.html#SOURCE_
> CLASS_POSITION
> [3] http://support.apple.com/kb/HT4288
>
> Best regards,
> Kershaw
>
>
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