XRSessionEvent - Web APIs 编辑

The WebXR Device API's XRSessionEvent interface describes an event which indicates the change of the state of an XRSession. These events occur, for example, when the session ends or the visibility of its context changes.

Constructor

XRSessionEvent()

Creates and returns a new XRSessionEvent object configured using the specified XRSessionEventInit object's values as available.

Properties

In addition to properties inherited from its parent interface, Event, XRSessionEvent provides the folllowing:

session Read only

The XRSession to which the event refers.

Methods

While XRSessionEvent defines no methods, it inherits methods from its parent interface, Event.

Session event types

The following events are represented using the XRSessionEvent interface, and are permitted values for its type property.

end

Fired at the session when it has ended, after being terminated by the application or the user agent.

visibilitychange

Fired at the session whenever its visibility state changes.

Examples

This example creates a listiener that watches for the visibility state of the session to change. It reacts by calling a function mySessionVisible() with a Boolean indicating whether or not the session is visible; this function might, for instance, spin up or reconfigure a worker that handles rendering the scene.

xrSession.addEventListener("visibilitystate", e => {
  switch(e.session.visibilitystate) {
    case "visible":
    case "visible-blurred":
      mySessionVisible(true);
      break;
    case "hidden":
      mySessionVisible(false);
      break;
  }
});

Specifications

Browser compatibility

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