foam-framework/core/firefox.js

MVC metaprogramming framework

/**
 * @license
 * Copyright 2014 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

if ( navigator && navigator.userAgent.indexOf('Firefox') != -1 ) {
  console.log('Loading Firefox Support.');

  Object.defineProperties(MouseEvent.prototype, {
    offsetX: {
      get: function() {
        return this.clientX - this.target.getBoundingClientRect().left;
      }
    },
    offsetY: {
      get: function() {
        return this.clientY - this.target.getBoundingClientRect().top;
      }
    }
  });
}