foam-framework/js/foam/memento/FalseOnlyMemorableLatch.js

MVC metaprogramming framework

/**
 * @license
 * Copyright 2015 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.
 */

CLASS({
  package: 'foam.memento',
  name: 'FalseOnlyMemorableLatch',
  properties: [
    {
      model_: 'BooleanProperty',
      name: 'value',
      memorable: true,
      defaultValue: true,
      hidden: false,
      postSet: function(_, v) {
        this.memento = { value: v.toString() };
      }
    },
    {
      name: 'memento',
      hidden: true,
      factory: function() {
        return { value: this.value.toString() }
      },
      postSet: function(_, v) {
        if ( v && v.value == 'false' && this.value )
          this.value = false;
      }
    }
  ]
});