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gaia/apps/system/js/network_activity_icon.js

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+/* global BaseIcon */
+'use strict';
+
+(function(exports) {
+  var NetworkActivityIcon = function(manager) {
+    BaseIcon.call(this, manager);
+  };
+  NetworkActivityIcon.prototype = Object.create(BaseIcon.prototype);
+  NetworkActivityIcon.prototype.name = 'NetworkActivityIcon';
+  NetworkActivityIcon.prototype.kActiveIndicatorTimeout = 500;
+  NetworkActivityIcon.prototype.UPDATE_ON_START = false;
+  NetworkActivityIcon.prototype.update = function() {
+    // Each time we receive an update, make network activity indicator
+    // show up for 500ms.
+    var icon = this.element;
+    if (!icon || !this.enabled()) {
+      return;
+    }
+
+    clearTimeout(this._networkActivityTimer);
+
+    this._networkActivityTimer = setTimeout(function hideNetActivityIcon() {
+      this.hide();
+    }.bind(this), this.kActiveIndicatorTimeout);
+
+    if (!this.isVisible()) {
+      this.show();
+    }
+  };
+
+  NetworkActivityIcon.prototype.view = function view() {
+    return `<!-- HACK: We use images instead of divs to enforce allocation of a
+             dedicated layer just for this animated icons, remove after
+             https://bugzil.la/717872 gets fixed -->
+            <img id="statusbar-network-activity"
+              src="style/statusbar/images/network-activity.png"
+              class="sb-icon-network-activity" hidden role="listitem"
+              data-l10n-id="statusbarNetworkActivity">`;
+  };
+
+  exports.NetworkActivityIcon = NetworkActivityIcon;
+}(window));