blob: 5c746665cd54b309d7d01bf6e37321d4dcad2711 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
// Copyright (c) 2012 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.
// Custom binding for the tts API.
var binding = require('binding').Binding.create('tts');
var ttsNatives = requireNative('tts');
var GetNextTTSEventId = ttsNatives.GetNextTTSEventId;
var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
var sendRequest = require('sendRequest').sendRequest;
var lazyBG = requireNative('lazy_background_page');
binding.registerCustomHook(function(api) {
var apiFunctions = api.apiFunctions;
var tts = api.compiledApi;
chromeHidden.tts = {
handlers: {}
};
function ttsEventListener(event) {
var eventHandler = chromeHidden.tts.handlers[event.srcId];
if (eventHandler) {
eventHandler({
type: event.type,
charIndex: event.charIndex,
errorMessage: event.errorMessage
});
if (event.isFinalEvent) {
delete chromeHidden.tts.handlers[event.srcId];
// Balanced in 'speak' handler.
lazyBG.DecrementKeepaliveCount();
}
}
}
// This file will get run if an extension needs the ttsEngine permission, but
// it doesn't necessarily have the tts permission. If it doesn't, trying to
// add a listener to chrome.tts.onEvent will fail.
// See http://crbug.com/122474.
try {
tts.onEvent.addListener(ttsEventListener);
} catch (e) {}
apiFunctions.setHandleRequest('speak', function() {
var args = arguments;
if (args.length > 1 && args[1] && args[1].onEvent) {
var id = GetNextTTSEventId();
args[1].srcId = id;
chromeHidden.tts.handlers[id] = args[1].onEvent;
// Keep the page alive until the event finishes.
// Balanced in eventHandler.
lazyBG.IncrementKeepaliveCount();
}
sendRequest(this.name, args, this.definition.parameters);
return id;
});
});
exports.binding = binding.generate();
|
