foam-framework/js/foam/ui/FloatFieldView.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.ui',
  name: 'FloatFieldView',

  extends: 'foam.ui.AbstractNumberFieldView',

  properties: [
    { name: 'precision', defaultValue: undefined }
  ],

  methods: {
    formatNumber: function(val) {
      if ( ! val ) return '0';
      val = val.toFixed(this.precision);
      var i = val.length-1;
      for ( ; i > 0 && val.charAt(i) === '0' ; i-- );
      return val.substring(0, val.charAt(i) === '.' ? i : i+1);
    },
    valueToText: function(val) {
      return this.hasOwnProperty('precision') ?
        this.formatNumber(val) :
        '' + val ;
    },
    textToValue: function(text) { return parseFloat(text) || 0; }
  }
});