aframe/src/systems/tracked-controls.js

A web framework for building virtual reality experiences.

import { registerSystem } from '../core/system.js';

/**
 * Tracked controls system.
 * Maintain list with available tracked controllers.
 */
export var System = registerSystem('tracked-controls', {
  init: function () {
    this.controllers = [];
    this.onInputSourcesChange = this.onInputSourcesChange.bind(this);
    this.onEnterVR = this.onEnterVR.bind(this);
    this.el.addEventListener('enter-vr', this.onEnterVR);

    this.onExitVR = this.onExitVR.bind(this);
    this.el.addEventListener('exit-vr', this.onExitVR);
  },

  onEnterVR: function () {
    var xrSession = this.el.xrSession;
    if (!xrSession) { return; }
    this.el.xrSession.addEventListener('inputsourceschange', this.onInputSourcesChange);
  },

  onExitVR: function () {
    this.referenceSpace = undefined;
    this.controllers = [];
    this.el.emit('controllersupdated', undefined, false);
  },

  onInputSourcesChange: function () {
    var self = this;
    var xrSession = this.el.xrSession;
    var refspace = this.el.sceneEl.systems.webxr.sessionReferenceSpaceType;
    xrSession.requestReferenceSpace(refspace).then(function (referenceSpace) {
      self.referenceSpace = referenceSpace;
    }).catch(function (err) {
      self.el.sceneEl.systems.webxr.warnIfFeatureNotRequested(
        refspace,
        'tracked-controls uses reference space "' + refspace + '".');
      throw err;
    });

    this.controllers = xrSession.inputSources;
    this.el.emit('controllersupdated', undefined, false);
  }
});