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third_party/polymer/v0_8/components/iron-a11y-announcer/iron-a11y-announcer.html

Index: third_party/polymer/v0_8/components/iron-a11y-announcer/iron-a11y-announcer.html
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+<!--
+@license
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+
+<!--
+`iron-a11y-announcer` is a singleton element that is intended to add a11y
+to features that require on-demand announcement from screen readers. In
+order to make use of the announcer, it is best to request its availability
+in the announcing element.
+
+Example:
+
+    Polymer({
+
+      is: 'x-chatty',
+
+      attached: function() {
+        // This will create the singlton element if it has not
+        // been created yet:
+        Polymer.IronA11yAnnouncer.requestAvailability();
+      }
+    });
+
+After the `iron-a11y-announcer` has been made available, elements can
+make announces by firing bubbling `iron-announce` events.
+
+Example:
+
+    this.fire('iron-announce', {
+      text: 'This is an announcement!'
+    }, { bubbles: true });
+
+Note: announcements are only audible if you have a screen reader enabled.
+
+@group Iron Elements
+@demo demo/index.html
+-->
+
+<dom-module id="iron-a11y-announcer">
+  <style>
+    :host {
+      display: inline-block;
+      position: fixed;
+      clip: rect(0px,0px,0px,0px);
+    }
+  </style>
+
+  <template>
+    <span aria-live$="[[mode]]">[[_text]]</span>
+  </template>
+
+  <script>
+
+    (function() {
+      'use strict';
+
+      Polymer.IronA11yAnnouncer = Polymer({
+        is: 'iron-a11y-announcer',
+
+        properties: {
+
+          /**
+           * The value of mode is used to set the `aria-live` attribute
+           * for the element that will be announced. Valid values are: `off`,
+           * `polite` and `assertive`.
+           */
+          mode: {
+            type: String,
+            value: 'polite'
+          },
+
+          _text: {
+            type: String,
+            value: ''
+          }
+        },
+
+        created: function() {
+          if (!Polymer.IronA11yAnnouncer.instance) {
+            Polymer.IronA11yAnnouncer.instance = this;
+          }
+
+          document.body.addEventListener('iron-announce', this._onIronAnnounce.bind(this));
+        },
+
+        /**
+         * Cause a text string to be announced by screen readers.
+         *
+         * @param {string} text The text that should be announced.
+         */
+        announce: function(text) {
+          this._text = '';
+          this.async(function() {
+            this._text = text;
+          }, 100);
+        },
+
+        _onIronAnnounce: function(event) {
+          if (event.detail && event.detail.text) {
+            this.announce(event.detail.text);
+          }
+        }
+      });
+
+      Polymer.IronA11yAnnouncer.instance = null;
+
+      Polymer.IronA11yAnnouncer.requestAvailability = function() {
+        if (!Polymer.IronA11yAnnouncer.instance) {
+          document.createElement('iron-a11y-announcer');
+        }
+
+        document.body.appendChild(Polymer.IronA11yAnnouncer.instance);
+      };
+    })();
+
+  </script>
+</dom-module>