/**
 * @license
 * Copyright (C) 2017 The Android Open Source Project
 *
 * 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.
 */
(function() {
  'use strict';

  /** @extends Polymer.Element */
  class GrEndpointParam extends Polymer.GestureEventListeners(
      Polymer.LegacyElementMixin(
          Polymer.Element)) {
    static get is() { return 'gr-endpoint-param'; }

    static get properties() {
      return {
        name: String,
        value: {
          type: Object,
          notify: true,
          observer: '_valueChanged',
        },
      };
    }

    _valueChanged(newValue, oldValue) {
      /* In polymer 2 the following change was made:
      "Property change notifications (property-changed events) aren't fired when
      the value changes as a result of a binding from the host"
      (see https://polymer-library.polymer-project.org/2.0/docs/about_20).
      To workaround this problem, we fire the event from the observer.
      In some cases this fire the event twice, but our code is
      ready for it.
      */
      const detail = {
        value: newValue,
      };
      this.dispatchEvent(new CustomEvent('value-changed', {detail}));
    }
  }

  customElements.define(GrEndpointParam.is, GrEndpointParam);
})();