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node_modules/node-blockly/blockly/accessible/notifications.service.js

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+/**
+ * AccessibleBlockly
+ *
+ * Copyright 2016 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the 'License');
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an 'AS IS' BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Angular2 Service for updating the ARIA live region that
+ * allows screenreaders to notify the user about actions that they have taken.
+ * @author sll@google.com (Sean Lip)
+ */
+
+goog.provide('blocklyApp.NotificationsService');
+
+
+blocklyApp.NotificationsService = ng.core.Class({
+  constructor: [function() {
+    this.currentMessage = '';
+    this.timeouts = [];
+  }],
+  setDisplayedMessage_: function(newMessage) {
+    this.currentMessage = newMessage;
+  },
+  getDisplayedMessage: function() {
+    return this.currentMessage;
+  },
+  speak: function(newMessage) {
+    // Clear and reset any existing timeouts.
+    this.timeouts.forEach(function(timeout) {
+      clearTimeout(timeout);
+    });
+    this.timeouts.length = 0;
+
+    // Clear the current message, so that if, e.g., two operations of the same
+    // type are performed, both messages will be read in succession.
+    this.setDisplayedMessage_('');
+
+    // We need a non-zero timeout here, otherwise NVDA does not read the
+    // notification messages properly.
+    var that = this;
+    this.timeouts.push(setTimeout(function() {
+      that.setDisplayedMessage_(newMessage);
+    }, 20));
+    this.timeouts.push(setTimeout(function() {
+      that.setDisplayedMessage_('');
+    }, 5000));
+  }
+});