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A few last tweaks from @cvan's feedback
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@toji
toji committed Feb 2, 2017
1 parent d55523b commit 9382e05
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64 changes: 44 additions & 20 deletions index.bs
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Expand Up @@ -221,24 +221,39 @@ Returns an array with the {{VRLayer}} currently being presented. MUST return an
<dfn method for="VRDisplay">submitFrame()</dfn>
Captures the current state of the {{VRLayer}} currently being presented and displays it on the {{VRDisplay}}. It is assumed that the frame was rendered using the {{VRPose}} and matrices provided by the last call to {{getFrameData()}}. If {{getFrameData()}} was not called prior to calling {{submitFrame()}} the user agent MAY warn the user of potentially malformed visuals or prevent the frame from being shown at all.

<dfn attribute for="VRDisplay">onactivate</dfn>
An <a>Event handler IDL attribute</a> for the {{activate}} event type.

<dfn attribute for="VRDisplay">ondeactivate</dfn>
An <a>Event handler IDL attribute</a> for the {{deactivate}} event type.

<dfn attribute for="VRDisplay">onblur</dfn>
An <a>Event handler IDL attribute</a> for the {{VRDisplay/blur}} event type.

<dfn attribute for="VRDisplay">onfocus</dfn>
An <a>Event handler IDL attribute</a> for the {{VRDisplay/focus}} event type.

<dfn attribute for="VRDisplay">onpresentchange</dfn>
An <a>Event handler IDL attribute</a> for the {{presentchange}} event type.

### Events ### {#vrdisplay-events}

The UA MUST provide the following new events. The corresponding events must be of type {{VRDisplayEvent}} and must fire on a {{VRDisplay}} object. Registration for and firing of the events must follow the usual behavior of DOM4 Events.

<dfn event for="VRDisplay" id="vrdisplay-onactivate-event">onactivate</dfn>
A user agent MAY dispatch this event type to indicate that something has occured which suggests the {{VRDisplay}} should be presented to. For example, if the {{VRDisplay}} is capable of detecting when the user has put it on, this event SHOULD fire when they do so with the {{VRDisplayEvent/reason}} "mounted".
<dfn event for="VRDisplay" id="vrdisplay-onactivate-event">activate</dfn>
A UA MAY dispatch this event type to indicate that something has occurred which suggests the {{VRDisplay}} should be presented to. For example, if the {{VRDisplay}} is capable of detecting when the user has put it on, this event SHOULD fire when they do so with the {{VRDisplayEvent/reason}} "mounted".

<dfn event for="VRDisplay" id="vrdisplay-ondeactivate-event">ondeactivate</dfn>
A user agent MAY dispatch this event type to indicate that something has occured which suggests the {{VRDisplay}} should exit presentation. For example, if the {{VRDisplay}} is capable of detecting when the user has taken it off, this event SHOULD fire when they do so with the {{VRDisplayEvent/reason}} "unmounted".
<dfn event for="VRDisplay" id="vrdisplay-deactivate-event">deactivate</dfn>
A UA MAY dispatch this event type to indicate that something has occurred which suggests the {{VRDisplay}} should exit presentation. For example, if the {{VRDisplay}} is capable of detecting when the user has taken it off, this event SHOULD fire when they do so with the {{VRDisplayEvent/reason}} "unmounted".

<dfn event for="VRDisplay" id="vrdisplay-onblur-event">onblur</dfn>
A user agent MAY dispatch this event type to indicate that presentation to the {{VRDisplay}} by the page is paused by the user agent, OS, or VR hardware. While a {{VRDisplay}} is blurred it does not lose it's presenting status ({{isPresenting}} continues to report true) but {{getFrameData()}} returns false without updating the provided {{VRFrameData}} and {{getPose()}} returns null. This is to prevent tracking while the user interacts with potentially sensitive UI. For example: A user agent SHOULD blur the presenting application when the user is typing a URL into the browser with a virtual keyboard, otherwise the presenting page may be able to guess the URL the user is entering by tracking their head motions. The event {{VRDisplayEvent/reason}} MUST be set to "blur".
<dfn event for="VRDisplay" id="vrdisplay-blur-event">blur</dfn>
A UA MAY dispatch this event type to indicate that presentation to the {{VRDisplay}} by the page is paused by the user agent, OS, or VR hardware. While a {{VRDisplay}} is blurred it does not lose it's presenting status ({{isPresenting}} continues to report true) but {{getFrameData()}} returns false without updating the provided {{VRFrameData}} and {{getPose()}} returns null. This is to prevent tracking while the user interacts with potentially sensitive UI. For example: A user agent SHOULD blur the presenting application when the user is typing a URL into the browser with a virtual keyboard, otherwise the presenting page may be able to guess the URL the user is entering by tracking their head motions. The event {{VRDisplayEvent/reason}} MUST be set to "blur".

<dfn event for="VRDisplay" id="vrdisplay-onfocus-event">onfocus</dfn>
A user agent MAY dispatch this event type to indicate that presentation to the {{VRDisplay}} by the page has resumed after being blurred. The event {{VRDisplayEvent/reason}} MUST be set to "focus".
<dfn event for="VRDisplay" id="vrdisplay-focus-event">focus</dfn>
A UA MAY dispatch this event type to indicate that presentation to the {{VRDisplay}} by the page has resumed after being blurred. The event {{VRDisplayEvent/reason}} MUST be set to "focus".

<dfn event for="VRDisplay" id="vrdisplay-onpresentchange-event">onpresentchange</dfn>
A user agent MUST dispatch this event type to indicate that the {{VRDisplay}} has begun or ended VR presentation. This event should not fire on subsequent calls to {{requestPresent()}} after the {{VRDisplay}} has already begun VR presentation. If presentation has begun the event {{VRDisplayEvent/reason}} MUST be set to "presentstart". If presentation has ended the event {{VRDisplayEvent/reason}} MUST be set to "presentend".
<dfn event for="VRDisplay" id="vrdisplay-presentchange-event">presentchange</dfn>
A UA MUST dispatch this event type to indicate that the {{VRDisplay}} has begun or ended VR presentation. This event should not fire on subsequent calls to {{requestPresent()}} after the {{VRDisplay}} has already begun VR presentation. If presentation has begun the event {{VRDisplayEvent/reason}} MUST be set to "presentstart". If presentation has ended the event {{VRDisplayEvent/reason}} MUST be set to "presentend".

<div class="example">
The following code demonstrates presenting a simple rendering loop to a {{VRDisplay}}.
Expand Down Expand Up @@ -601,25 +616,34 @@ interface VR : EventTarget {
<dfn method for="VR" id="vr-getavailability-attribute">getAvailability()</dfn>
Return a Promise and run the following steps in parallel:

* If the user has configured the UA to return a particular answer from this function for the current origin, queue a task to resolve the promise with the configured answer, and abort these steps.
* If the UA has the ability to use WebVR, queue a task to resolve the promise with true.
* Otherwise, queue a task to resolve the promise with false.
0. If the user has configured the UA to return a particular answer from this function for the current origin, queue a task to resolve the promise with the configured answer, and abort these steps.
1. If the UA has the ability to use WebVR, queue a task to resolve the promise with true.
2. Otherwise, queue a task to resolve the promise with false.

<dfn method for="VR" id="vr-getdisplays-attribute">getDisplays()</dfn>
<dfn method for="VR" id="vr-getdisplays-method">getDisplays()</dfn>
Return a Promise which resolves to a list of available {{VRDisplay}}s.

<dfn attribute for="VR" id="vr-ondisplayconnect-attribute">ondisplayconnect</dfn>
An <a>Event handler IDL attribute</a> for the {{displayconnect}} event type.

<dfn attribute for="VR" id="vr-ondisplaydisconnect-attribute">ondisplaydisconnect</dfn>
An <a>Event handler IDL attribute</a> for the {{displaydisconnect}} event type.

<dfn attribute for="VR" id="vr-onnavigate-attribute">onnavigate</dfn>
An <a>Event handler IDL attribute</a> for the {{navigate}} event type.

### Events ### {#vr-events}

The UA MUST provide the following new events. The corresponding events must be of type {{VRDisplayEvent}} and must fire on the {{VR}} object. Registration for and firing of the events must follow the usual behavior of DOM4 Events.

<dfn event for="VR" id="vr-ondisplayconnect-event">ondisplayconnect</dfn>
A user agent MAY dispatch this event type to indicate that a {{VRDisplay}} has been connected.
<dfn event for="VR" id="vr-displayconnect-event">displayconnect</dfn>
A UA MAY dispatch this event type to indicate that a {{VRDisplay}} has been connected.

<dfn event for="VR" id="vr-ondisplaydisconnect-event">ondisplaydisconnect</dfn>
A user agent MAY dispatch this event type to indicate that a {{VRDisplay}} has been disconnected.
<dfn event for="VR" id="vr-displaydisconnect-event">displaydisconnect</dfn>
A UA MAY dispatch this event type to indicate that a {{VRDisplay}} has been disconnected.

<dfn event for="VR" id="vr-ondisplaynavigate-event">onnavigate</dfn>
A user agent MAY dispatch this event type to indicate that the current page has been navigated to from a page that was actively presenting VR content. The current page can call {{requestPresent()}} in response to this event in order to stay in VR presentation mode.
<dfn event for="VR" id="vr-navigate-event">navigate</dfn>
A UA MAY dispatch this event type to indicate that the current page has been navigated to from a browsing context that was actively presenting VR content. The current page can call {{requestPresent()}} in response to this event in order to stay in VR presentation mode.


## Navigator Interface extension ## {#interface-navigator}
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