Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/toolbar/js/views/ToolbarAuralView.js

@@ -0,0 +1,66 @@
+/**
+ * @file
+ * A Backbone view for the aural feedback of the toolbar.
+ */
+
+(function (Backbone, Drupal) {
+
+  "use strict";
+
+  Drupal.toolbar.ToolbarAuralView = Backbone.View.extend(/** @lends Drupal.toolbar.ToolbarAuralView# */{
+
+    /**
+     * Backbone view for the aural feedback of the toolbar.
+     *
+     * @constructs
+     *
+     * @augments Backbone.View
+     *
+     * @param {object} options
+     * @param {object} options.strings
+     */
+    initialize: function (options) {
+      this.strings = options.strings;
+
+      this.listenTo(this.model, 'change:orientation', this.onOrientationChange);
+      this.listenTo(this.model, 'change:activeTray', this.onActiveTrayChange);
+    },
+
+    /**
+     * Announces an orientation change.
+     *
+     * @param {Drupal.toolbar.ToolbarModel} model
+     * @param {string} orientation
+     *   The new value of the orientation attribute in the model.
+     */
+    onOrientationChange: function (model, orientation) {
+      Drupal.announce(Drupal.t('Tray orientation changed to @orientation.', {
+        '@orientation': orientation
+      }));
+    },
+
+    /**
+     * Announces a changed active tray.
+     *
+     * @param {Drupal.toolbar.ToolbarModel} model
+     * @param {HTMLElement} tray
+     *   The new value of the tray attribute in the model.
+     */
+    onActiveTrayChange: function (model, tray) {
+      var relevantTray = (tray === null) ? model.previous('activeTray') : tray;
+      var action = (tray === null) ? Drupal.t('closed') : Drupal.t('opened');
+      var trayNameElement = relevantTray.querySelector('.toolbar-tray-name');
+      var text;
+      if (trayNameElement !== null) {
+        text = Drupal.t('Tray "@tray" @action.', {
+          '@tray': trayNameElement.textContent, '@action': action
+        });
+      }
+      else {
+        text = Drupal.t('Tray @action.', {'@action': action});
+      }
+      Drupal.announce(text);
+    }
+  });
+
+}(Backbone, Drupal));