aframe-extras/dist/components/grab.js

Add-ons and examples for A-Frame VR.

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		for(var i in a) (typeof exports === 'object' ? exports : root)[i] = a[i];
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return /******/ (() => { // webpackBootstrap
var __webpack_exports__ = {};
/*!**************************!*\
  !*** ./src/misc/grab.js ***!
  \**************************/
/* global CANNON */

/**
 * Based on aframe/examples/showcase/tracked-controls.
 *
 * Handles events coming from the hand-controls.
 * Determines if the entity is grabbed or released.
 * Updates its position to move along the controller.
 */
AFRAME.registerComponent('grab', {
  init: function () {
    this.system = this.el.sceneEl.systems.physics;

    this.GRABBED_STATE = 'grabbed';

    this.grabbing = false;
    this.hitEl =      /** @type {AFRAME.Element}    */ null;
    this.physics =    /** @type {AFRAME.System}     */ this.el.sceneEl.systems.physics;
    this.constraint = /** @type {CANNON.Constraint} */ null;

    // Bind event handlers
    this.onHit = this.onHit.bind(this);
    this.onGripOpen = this.onGripOpen.bind(this);
    this.onGripClose = this.onGripClose.bind(this);
  },

  play: function () {
    const el = this.el;
    el.addEventListener('hit', this.onHit);
    el.addEventListener('gripdown', this.onGripClose);
    el.addEventListener('gripup', this.onGripOpen);
    el.addEventListener('trackpaddown', this.onGripClose);
    el.addEventListener('trackpadup', this.onGripOpen);
    el.addEventListener('triggerdown', this.onGripClose);
    el.addEventListener('triggerup', this.onGripOpen);
  },

  pause: function () {
    const el = this.el;
    el.removeEventListener('hit', this.onHit);
    el.removeEventListener('gripdown', this.onGripClose);
    el.removeEventListener('gripup', this.onGripOpen);
    el.removeEventListener('trackpaddown', this.onGripClose);
    el.removeEventListener('trackpadup', this.onGripOpen);
    el.removeEventListener('triggerdown', this.onGripClose);
    el.removeEventListener('triggerup', this.onGripOpen);
  },

  onGripClose: function () {
    this.grabbing = true;
  },

  onGripOpen: function () {
    const hitEl = this.hitEl;
    this.grabbing = false;
    if (!hitEl) { return; }
    hitEl.removeState(this.GRABBED_STATE);
    this.hitEl = undefined;
    this.system.removeConstraint(this.constraint);
    this.constraint = null;
  },

  onHit: function (evt) {
    const hitEl = evt.detail.el;
    // If the element is already grabbed (it could be grabbed by another controller).
    // If the hand is not grabbing the element does not stick.
    // If we're already grabbing something you can't grab again.
    if (hitEl.is(this.GRABBED_STATE) || !this.grabbing || this.hitEl) { return; }
    hitEl.addState(this.GRABBED_STATE);
    this.hitEl = hitEl;
    this.constraint = new CANNON.LockConstraint(this.el.body, hitEl.body);
    this.system.addConstraint(this.constraint);
  }
});

/******/ 	return __webpack_exports__;
/******/ })()
;
});
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