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gaia/apps/system/js/battery_icon.js

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+/* global BaseIcon */
+'use strict';
+
+(function(exports) {
+  var BatteryIcon = function(manager) {
+    BaseIcon.call(this, manager);
+  };
+  BatteryIcon.prototype = Object.create(BaseIcon.prototype);
+  BatteryIcon.prototype.name = 'BatteryIcon';
+  BatteryIcon.prototype.update = function() {
+    if (!this.element) {
+      return;
+    }
+    this.show();
+    var battery = this.manager._battery;
+    var icon = this.element;
+    var previousLevel = parseInt(icon.dataset.level, 10);
+    var previousCharging = (icon.dataset.charging === 'true');
+
+    icon.dataset.charging = battery.charging;
+    var level = Math.floor(battery.level * 10) * 10;
+
+    this.debug('previous level: ', previousLevel);
+    this.debug('current level:', level);
+
+    if (previousLevel === level &&
+        previousCharging === battery.charging) {
+      return;
+    }
+
+    icon.dataset.level = level;
+    navigator.mozL10n.setAttributes(
+      icon,
+      battery.charging ? 'statusbarBatteryCharging' : 'statusbarBattery',
+      {level: level}
+    );
+    this.previousCharging = battery.charging;
+    this.publish('changed');
+  };
+
+  BatteryIcon.prototype.view = function view() {
+    return `<div id="statusbar-battery"
+              class="sb-icon sb-icon-battery"
+              role="listitem">
+            </div>`;
+  };
+
+  exports.BatteryIcon = BatteryIcon;
+}(window));