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gaia/apps/system/lockscreen/js/lockscreen_charging.js

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+'use strict';
+(function(exports) {
+
+/**
+ * Creates an object used for refreshing the charging string UI element.
+ * @class  LockScreenChargingStatus
+ */
+function LockScreenChargingStatus() {
+  this.elements = {
+    charging: document.getElementById('lockscreen-charging')
+  };
+
+  // Create a text node so we can access its data later for updating the status.
+  if (!this.elements.charging.firstChild) {
+    this.elements.charging.appendChild(document.createTextNode(''));
+  }
+}
+
+LockScreenChargingStatus.listenEvents = [
+  'chargingchange',
+  'levelchange',
+  'chargingtimechange'
+];
+
+LockScreenChargingStatus.prototype.start = function cs_start() {
+  this.refresh();
+
+  LockScreenChargingStatus.listenEvents.forEach(
+    ename => navigator.battery.addEventListener(ename, this));
+};
+
+LockScreenChargingStatus.prototype.stop = function cs_stop() {
+  LockScreenChargingStatus.listenEvents.forEach(
+    ename => navigator.battery.removeEventListener(ename, this));
+};
+
+LockScreenChargingStatus.prototype.handleEvent = function cs_handleEvent(evt) {
+  this.refresh();
+};
+
+LockScreenChargingStatus.prototype.refresh = function cs_refresh() {
+
+  if (!navigator.battery.charging) {
+    if (!this.elements.charging.hasAttribute('hidden')) {
+      this.elements.charging.setAttribute('hidden', '');
+    }
+    return;
+  }
+
+  var l10nAttrs = {
+    id: null,
+    args: {
+      level: parseInt(navigator.battery.level * 100)
+    }
+  };
+
+  var chargingTime = navigator.battery.chargingTime;
+
+  if (chargingTime === Infinity ||
+      chargingTime < 60) { // less than a minute remaining
+    l10nAttrs.id = 'charging-no-time';
+  } else {
+    var timeLeft = new Date(0, 0, 0, 0, 0, chargingTime);
+    l10nAttrs.args.hours = timeLeft.getHours();
+    l10nAttrs.args.minutes = timeLeft.getMinutes();
+
+    if (l10nAttrs.args.hours > 0) {
+      l10nAttrs.id = 'charging-hours';
+    } else {
+      l10nAttrs.id = 'charging-minutes';
+    }
+  }
+
+  // Update data here since changing textContent will replace the text node and
+  // could cause flickering while transitioning docshell.isActive to true.
+  navigator.mozL10n.formatValue(l10nAttrs.id, l10nAttrs.args).then((value) => {
+    this.elements.charging.firstChild.data = value;
+  });
+
+  if (this.elements.charging.hasAttribute('hidden')) {
+    this.elements.charging.removeAttribute('hidden');
+  }
+};
+
+/** @exports LockScreenChargingStatus */
+exports.LockScreenChargingStatus = LockScreenChargingStatus;
+
+})(window);