Add functionality for playing audio files.

accessible/README

@@ -25,15 +25,16 @@ the main component to be loaded. This will usually be blocklyApp.AppView, but
 if you have another component that wraps it, use that one instead.
 
 
-Customizing the Toolbar
------------------------
+Customizing the Toolbar and Audio
+---------------------------------
 The Accessible Blockly workspace comes with a customizable toolbar.
 
 To customize the toolbar, you will need to declare an ACCESSIBLE_GLOBALS object
 in the global scope that looks like this:
 
     var ACCESSIBLE_GLOBALS = {
-      toolbarButtonConfig: []
+      toolbarButtonConfig: [],
+      mediaPathPrefix: null
     };
 
 The value corresponding to 'toolbarButtonConfig' can be modified by adding
@@ -43,6 +44,9 @@ two keys:
   - 'text' (the text to display on the button)
   - 'action' (the function that gets run when the button is clicked)
 
+In addition, if you want audio to be played, set mediaPathPrefix to the
+location of the accessible/media folder.
+
 
 Limitations
 -----------

accessible/app.component.js

@@ -64,7 +64,8 @@ blocklyApp.AppView = ng.core
     // https://www.sitepoint.com/angular-2-components-providers-classes-factories-values/
     providers: [
         blocklyApp.ClipboardService, blocklyApp.NotificationsService,
-        blocklyApp.TreeService, blocklyApp.UtilsService]
+        blocklyApp.TreeService, blocklyApp.UtilsService,
+        blocklyApp.AudioService]
   })
   .Class({
     constructor: [blocklyApp.NotificationsService, function(_notificationsService) {

accessible/audio.service.js

@@ -0,0 +1,57 @@
+/**
+ * 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 that plays audio files.
+ * @author sll@google.com (Sean Lip)
+ */
+
+blocklyApp.AudioService = ng.core
+  .Class({
+    constructor: [function() {
+      // We do not play any audio unless a media path prefix is specified.
+      this.canPlayAudio = false;
+      if (ACCESSIBLE_GLOBALS.hasOwnProperty('mediaPathPrefix')) {
+        this.canPlayAudio = true;
+        var mediaPathPrefix = ACCESSIBLE_GLOBALS['mediaPathPrefix'];
+        this.AUDIO_PATHS_ = {
+          'connect': mediaPathPrefix + 'click.mp3',
+          'delete': mediaPathPrefix + 'delete.mp3'
+        };
+      }
+
+      // TODO(sll): Add ogg and mp3 fallbacks.
+      this.cachedAudioFiles_ = {};
+    }],
+    play_: function(audioId) {
+      if (this.canPlayAudio) {
+        if (!this.cachedAudioFiles_.hasOwnProperty(audioId)) {
+          this.cachedAudioFiles_[audioId] = new Audio(
+              this.AUDIO_PATHS_[audioId]);
+        }
+        this.cachedAudioFiles_[audioId].play();
+      }
+    },
+    playConnectSound: function() {
+      this.play_('connect');
+    },
+    playDeleteSound: function() {
+      this.play_('delete');
+    }
+  });

accessible/clipboard.service.js

@@ -26,7 +26,8 @@ blocklyApp.ClipboardService = ng.core
   .Class({
     constructor: [
         blocklyApp.NotificationsService, blocklyApp.UtilsService,
-        function(_notificationsService, _utilsService) {
+        blocklyApp.AudioService,
+        function(_notificationsService, _utilsService, _audioService) {
       this.clipboardBlockXml_ = null;
       this.clipboardBlockPreviousConnection_ = null;
       this.clipboardBlockNextConnection_ = null;
@@ -34,6 +35,7 @@ blocklyApp.ClipboardService = ng.core
       this.markedConnection_ = null;
       this.notificationsService = _notificationsService;
       this.utilsService = _utilsService;
+      this.audioService = _audioService;
     }],
     areConnectionsCompatible_: function(blockConnection, connection) {
       // Check that both connections exist, that it's the right kind of
@@ -130,6 +132,7 @@ blocklyApp.ClipboardService = ng.core
         default:
           connection.connect(reconstitutedBlock.outputConnection);
       }
+      this.audioService.playConnectSound();
       this.notificationsService.setStatusMessage(
           this.utilsService.getBlockDescription(reconstitutedBlock) + ' ' +
           Blockly.Msg.PASTED_BLOCK_FROM_CLIPBOARD_MSG);
@@ -151,6 +154,7 @@ blocklyApp.ClipboardService = ng.core
         if (this.areConnectionsCompatible_(
             this.markedConnection_, potentialConnections[i])) {
           this.markedConnection_.connect(potentialConnections[i]);
+          this.audioService.playConnectSound();
           connectionSuccessful = true;
           break;
         }

accessible/workspace-tree.component.js

@@ -102,13 +102,15 @@ blocklyApp.WorkspaceTreeComponent = ng.core
     constructor: [
         blocklyApp.ClipboardService, blocklyApp.NotificationsService,
         blocklyApp.TreeService, blocklyApp.UtilsService,
+        blocklyApp.AudioService,
         function(
             _clipboardService, _notificationsService, _treeService,
-            _utilsService) {
+            _utilsService, _audioService) {
       this.clipboardService = _clipboardService;
       this.notificationsService = _notificationsService;
       this.treeService = _treeService;
       this.utilsService = _utilsService;
+      this.audioService = _audioService;
     }],
     getBlockDescription: function() {
       return this.utilsService.getBlockDescription(this.block);
@@ -172,6 +174,7 @@ blocklyApp.WorkspaceTreeComponent = ng.core
       var that = this;
       this.removeBlockAndSetFocus_(this.block, function() {
         that.block.dispose(true);
+        that.audioService.playDeleteSound();
       });
 
       setTimeout(function() {

demos/accessible/index.html

@@ -19,6 +19,7 @@
   <script src="../../accessible/libs/angular2-all.umd.min.js"></script>
 
   <script src="../../accessible/utils.service.js"></script>
+  <script src="../../accessible/audio.service.js"></script>
   <script src="../../accessible/notifications.service.js"></script>
   <script src="../../accessible/clipboard.service.js"></script>
   <script src="../../accessible/tree.service.js"></script>
@@ -31,7 +32,7 @@
   <script src="../../accessible/workspace.component.js"></script>
   <script src="../../accessible/app.component.js"></script>
 
-  <link rel="stylesheet" href="../../media/accessible.css">
+  <link rel="stylesheet" href="../../accessible/media/accessible.css">
   <style>
     body {
       background-color: #fff;
@@ -48,8 +49,10 @@
   </style>
 </head>
 <body>
-  <h1><a href="https://developers.google.com/blockly/">Blockly</a> &gt;
-    <a href="../index.html">Demos</a> &gt; Accessible Blockly</h1>
+  <h1>
+    <a href="https://developers.google.com/blockly/">Blockly</a> &gt;
+    <a href="../index.html">Demos</a> &gt; Accessible Blockly
+  </h1>
 
   <p>This is a simple demo of a version of Blockly designed for screen readers.</p>
 
@@ -70,7 +73,9 @@
     var ACCESSIBLE_GLOBALS = {
       // Additional buttons for the workspace toolbar that
       // go before the "Clear Workspace" button.
-      toolbarButtonConfig: []
+      toolbarButtonConfig: [],
+      // Prefix of path to sound files.
+      mediaPathPrefix: '../../accessible/media/'
     };
     document.addEventListener('DOMContentLoaded', function() {
       ng.platform.browser.bootstrap(blocklyApp.AppView);