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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Bridge that sends TTS messages from content scripts or
* other pages to the main background page.
*
*/
goog.provide('cvox.ChromeTts');
goog.require('cvox.ChromeTtsBase');
goog.require('cvox.HostFactory');
/**
* @constructor
* @extends {cvox.ChromeTtsBase}
*/
cvox.ChromeTts = function() {
goog.base(this);
this.addBridgeListener();
};
goog.inherits(cvox.ChromeTts, cvox.ChromeTtsBase);
/**
* Current call id, used for matching callback functions.
* @type {number}
*/
cvox.ChromeTts.callId = 1;
/**
* Maps call ids to callback functions.
* @type {Object.<number, Function>}
*/
cvox.ChromeTts.functionMap = new Object();
/** @override */
cvox.ChromeTts.prototype.speak = function(textString, queueMode, properties) {
if (!properties) {
properties = {};
}
goog.base(this, 'speak', textString, queueMode, properties);
cvox.ExtensionBridge.send(
this.createMessageForProperties_(textString, queueMode, properties));
};
/** @override */
cvox.ChromeTts.prototype.isSpeaking = function() {
cvox.ChromeTts.superClass_.isSpeaking.call(this);
return false;
};
/** @override */
cvox.ChromeTts.prototype.stop = function() {
cvox.ChromeTts.superClass_.stop.call(this);
cvox.ExtensionBridge.send(
{'target': 'TTS',
'action': 'stop'});
};
/** @override */
cvox.ChromeTts.prototype.increaseOrDecreaseProperty =
function(propertyName, increase) {
cvox.ExtensionBridge.send(
{'target': 'TTS',
'action': 'increaseOrDecrease',
'property': propertyName,
'increase': increase});
};
/**
* Increases a TTS speech property.
* @param {string} property_name The name of the property to increase.
* @param {boolean} announce Whether to announce that the property is
* changing.
*/
cvox.ChromeTts.prototype.increaseProperty = function(property_name, announce) {
goog.base(this, 'increaseProperty', property_name, announce);
cvox.ExtensionBridge.send(
{'target': 'TTS',
'action': 'increase' + property_name,
'announce': announce});
};
/**
* Listens for TTS_COMPLETED message and executes the callback function.
*/
cvox.ChromeTts.prototype.addBridgeListener = function() {
cvox.ExtensionBridge.addMessageListener(
function(msg, port) {
var message = msg['message'];
if (message == 'TTS_CALLBACK') {
var id = msg['id'];
var func = cvox.ChromeTts.functionMap[id];
if (func != undefined) {
func();
delete cvox.ChromeTts.functionMap[id];
}
}
});
};
/**
* Creates a message suitable for sending as a speak action to background tts.
* @param {string} textString The string of text to be spoken.
* @param {number=} queueMode The queue mode: cvox.AbstractTts.QUEUE_MODE_FLUSH,
* for flush, cvox.AbstractTts.QUEUE_MODE_QUEUE for adding to queue.
* @param {Object=} properties Speech properties to use for this utterance.
* @return {Object} A message.
* @private
*/
cvox.ChromeTts.prototype.createMessageForProperties_ =
function(textString, queueMode, properties) {
var message = {'target': 'TTS',
'action': 'speak',
'text': textString,
'queueMode': queueMode,
'properties': properties};
if (properties['startCallback'] != undefined) {
cvox.ChromeTts.functionMap[cvox.ChromeTts.callId] =
properties['startCallback'];
message['startCallbackId'] = cvox.ChromeTts.callId++;
}
if (properties['endCallback'] != undefined) {
cvox.ChromeTts.functionMap[cvox.ChromeTts.callId] =
properties['endCallback'];
message['endCallbackId'] = cvox.ChromeTts.callId++;
}
return message;
};
cvox.HostFactory.ttsConstructor = cvox.ChromeTts;
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