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gaia/apps/settings/js/modules/battery.js

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+/**
+ * Battery is an Observable that wraps the platform battery object. It has two
+ * observable properties: level and state.
+ *
+ * @module modules/battery
+ */
+define(function(require) {
+  'use strict';
+
+  var NavigatorBattery = require('modules/navigator/battery');
+  var Module = require('modules/base/module');
+  var Observable = require('modules/mvvm/observable');
+
+  /**
+   * @class Battery
+   * @requires module:modules/navigator/battery
+   * @requires module:modules/base/module
+   * @requires module:modules/mvvm/observable
+   * @returns {Battery}
+   */
+  var Battery = Module.create(function Battery() {
+    this.super(Observable).call(this);
+
+    this._level = this._getLevel();
+    this._state = this._getState();
+    this._chargingTime = this._getChargingTime();
+    this._dischargingTime = this._getDischargingTime();
+    NavigatorBattery.addEventListener('levelchange', () => {
+      this._level = this._getLevel();
+    });
+    NavigatorBattery.addEventListener('chargingchange', () => {
+      this._state = this._getState();
+      this._chargingTime = this._getChargingTime();
+      this._dischargingTime = this._getDischargingTime();
+    });
+    NavigatorBattery.addEventListener('chargingtimechange', () => {
+      this._chargingTime = this._getChargingTime();
+    });
+    NavigatorBattery.addEventListener('dischargingtimechange', () => {
+      this._dischargingTime = this._getDischargingTime();
+    });
+  }).extend(Observable);
+
+  /**
+   * An observable property indicating the current battery level.
+   *
+   * @access public
+   * @readonly
+   * @memberOf Battery.prototype
+   * @type {String}
+   */
+  Observable.defineObservableProperty(Battery.prototype,
+    'level', {
+      readonly: true,
+      value: ''
+  });
+
+  /**
+   * An observable property indicating the current battery state.
+   *
+   * @access public
+   * @readonly
+   * @memberOf Battery.prototype
+   * @type {String}
+   */
+  Observable.defineObservableProperty(Battery.prototype,
+    'state', {
+      readonly: true,
+      value: ''
+  });
+
+  /**
+   * An observable property indicating the current charging time.
+   *
+   * @access public
+   * @readonly
+   * @memberOf Battery.prototype
+   * @type {String}
+   */
+  Observable.defineObservableProperty(Battery.prototype,
+    'chargingTime', {
+      readonly: true,
+      value: ''
+  });
+
+  /**
+   * An observable property indicating the current discharging time.
+   *
+   * @access public
+   * @readonly
+   * @memberOf Battery.prototype
+   * @type {String}
+   */
+  Observable.defineObservableProperty(Battery.prototype,
+    'dischargingTime', {
+      readonly: true,
+      value: ''
+  });
+
+  Battery.prototype._getLevel = function() {
+    return Math.min(100, Math.round(NavigatorBattery.level * 100));
+  };
+
+  Battery.prototype._getState = function() {
+    if (NavigatorBattery.charging) {
+      return (this._getLevel() == 100) ? 'charged' : 'charging';
+    } else {
+      return 'unplugged';
+    }
+  };
+
+  Battery.prototype._getChargingTime = function() {
+    return NavigatorBattery.chargingTime;
+  };
+
+  Battery.prototype._getDischargingTime = function() {
+    return NavigatorBattery.dischargingTime;
+  };
+
+  return Battery();
+});