goog.events.BrowserEvent.prototype.init = function()

in asdoc/library/closure/goog/events/browserevent.js [273:346]

• 54 lines of code
• 28 McCabe index (conditional complexity)

goog.events.BrowserEvent.prototype.init = function(e, opt_currentTarget) {
  var type = this.type = e.type;

  /**
   * On touch devices use the first "changed touch" as the relevant touch.
   * @type {Touch}
   */
  var relevantTouch = e.changedTouches ? e.changedTouches[0] : null;

  // TODO(nicksantos): Change this.target to type EventTarget.
  this.target = /** @type {Node} */ (e.target) || e.srcElement;

  // TODO(nicksantos): Change this.currentTarget to type EventTarget.
  this.currentTarget = /** @type {Node} */ (opt_currentTarget);

  var relatedTarget = /** @type {Node} */ (e.relatedTarget);
  if (relatedTarget) {
    // There's a bug in FireFox where sometimes, relatedTarget will be a
    // chrome element, and accessing any property of it will get a permission
    // denied exception. See:
    // https://bugzilla.mozilla.org/show_bug.cgi?id=497780
    if (goog.userAgent.GECKO) {
      if (!goog.reflect.canAccessProperty(relatedTarget, 'nodeName')) {
        relatedTarget = null;
      }
    }
  } else if (type == goog.events.EventType.MOUSEOVER) {
    relatedTarget = e.fromElement;
  } else if (type == goog.events.EventType.MOUSEOUT) {
    relatedTarget = e.toElement;
  }

  this.relatedTarget = relatedTarget;

  if (!goog.isNull(relevantTouch)) {
    this.clientX = relevantTouch.clientX !== undefined ? relevantTouch.clientX :
                                                         relevantTouch.pageX;
    this.clientY = relevantTouch.clientY !== undefined ? relevantTouch.clientY :
                                                         relevantTouch.pageY;
    this.screenX = relevantTouch.screenX || 0;
    this.screenY = relevantTouch.screenY || 0;
  } else {
    // Webkit emits a lame warning whenever layerX/layerY is accessed.
    // http://code.google.com/p/chromium/issues/detail?id=101733
    this.offsetX = (goog.userAgent.WEBKIT || e.offsetX !== undefined) ?
        e.offsetX :
        e.layerX;
    this.offsetY = (goog.userAgent.WEBKIT || e.offsetY !== undefined) ?
        e.offsetY :
        e.layerY;
    this.clientX = e.clientX !== undefined ? e.clientX : e.pageX;
    this.clientY = e.clientY !== undefined ? e.clientY : e.pageY;
    this.screenX = e.screenX || 0;
    this.screenY = e.screenY || 0;
  }

  this.button = e.button;

  this.keyCode = e.keyCode || 0;
  this.key = e.key || '';
  this.charCode = e.charCode || (type == 'keypress' ? e.keyCode : 0);
  this.ctrlKey = e.ctrlKey;
  this.altKey = e.altKey;
  this.shiftKey = e.shiftKey;
  this.metaKey = e.metaKey;
  this.platformModifierKey = goog.userAgent.MAC ? e.metaKey : e.ctrlKey;
  this.pointerId = e.pointerId || 0;
  this.pointerType = goog.events.BrowserEvent.getPointerType_(e);
  this.state = e.state;
  this.event_ = e;
  if (e.defaultPrevented) {
    this.preventDefault();
  }
};