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node_modules/node-blockly/blockly/accessible/audio.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 playing audio files.
+ * @author sll@google.com (Sean Lip)
+ */
+
+goog.provide('blocklyApp.AudioService');
+
+goog.require('blocklyApp.NotificationsService');
+
+
+blocklyApp.AudioService = ng.core.Class({
+  constructor: [
+    blocklyApp.NotificationsService, function(notificationsService) {
+      this.notificationsService = notificationsService;
+
+      // 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',
+          'oops': mediaPathPrefix + 'oops.mp3'
+        };
+      }
+
+      this.cachedAudioFiles_ = {};
+      // Store callback references here so that they can be removed if a new
+      // call to this.play_() comes in.
+      this.onEndedCallbacks_ = {
+        'connect': [],
+        'delete': [],
+        'oops': []
+      };
+    }
+  ],
+  play_: function(audioId, onEndedCallback) {
+    if (this.canPlayAudio) {
+      if (!this.cachedAudioFiles_.hasOwnProperty(audioId)) {
+        this.cachedAudioFiles_[audioId] = new Audio(this.AUDIO_PATHS_[audioId]);
+      }
+
+      if (onEndedCallback) {
+        this.onEndedCallbacks_[audioId].push(onEndedCallback);
+        this.cachedAudioFiles_[audioId].addEventListener(
+            'ended', onEndedCallback);
+      } else {
+        var that = this;
+        this.onEndedCallbacks_[audioId].forEach(function(callback) {
+          that.cachedAudioFiles_[audioId].removeEventListener(
+              'ended', callback);
+        });
+        this.onEndedCallbacks_[audioId].length = 0;
+      }
+
+      this.cachedAudioFiles_[audioId].play();
+    }
+  },
+  playConnectSound: function() {
+    this.play_('connect');
+  },
+  playDeleteSound: function() {
+    this.play_('delete');
+  },
+  playOopsSound: function(optionalStatusMessage) {
+    if (optionalStatusMessage) {
+      var that = this;
+      this.play_('oops', function() {
+        that.notificationsService.speak(optionalStatusMessage);
+      });
+    } else {
+      this.play_('oops');
+    }
+  }
+});