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Bug 960267 - Use settings speech volume and rate, when available. r=yzen

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This commit is contained in:
Eitan Isaacson 2014-01-23 10:37:38 -08:00
parent d2815c12ae
commit 06c600bb02
1 changed files with 43 additions and 5 deletions
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48
accessible/src/jsat/AccessFu.jsm
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@ -506,23 +506,52 @@ var Output = {
webspeechEnabled: false,
deferredOutputs: [],
init: function init() {
let window = Utils.win;
this.webspeechEnabled = !!window.speechSynthesis;
let settingsToGet = 2;
let settingsCallback = (aName, aSetting) => {
if (--settingsToGet > 0) {
return;
}
this.inited = true;
for (let actions of this.deferredOutputs) {
this.output(actions);
}
};
this._volumeSetting = new SettingCache(
'accessibility.screenreader-volume', settingsCallback,
{ defaultValue: 1, callbackNow: true, callbackOnce: true });
this._rateSetting = new SettingCache(
'accessibility.screenreader-rate', settingsCallback,
{ defaultValue: 0, callbackNow: true, callbackOnce: true });
for (let earcon of this.EARCONS) {
let earconName = /(^.*)\..*$/.exec(earcon)[1];
this.earconBuffers[earconName] = new WeakMap();
this.earconBuffers[earconName].set(
window, new window.Audio('chrome://global/content/accessibility/' + earcon));
}
},
this.inited = true;
uninit: function uninit() {
if (this.inited) {
delete this._volumeSetting;
delete this._rateSetting;
}
this.inited = false;
},
output: function output(aActions) {
if (!this.inited) {
this.init();
this.deferredOutputs.push(aActions);
return;
}
for (let action of aActions) {
@ -535,12 +564,18 @@ var Output = {
}
if (action.method === 'speak' && this.webspeechEnabled) {
window.speechSynthesis.speak(
new window.SpeechSynthesisUtterance(action.data));
let utterance = new window.SpeechSynthesisUtterance(action.data);
let requestedRate = this._rateSetting.value;
utterance.volume = this._volumeSetting.value;
utterance.rate = requestedRate >= 0 ?
requestedRate + 1 : 1 / (Math.abs(requestedRate) + 1);
window.speechSynthesis.speak(utterance);
} else if (action.method === 'playEarcon') {
let audioBufferWeakMap = this.earconBuffers[action.data];
if (audioBufferWeakMap) {
audioBufferWeakMap.get(window).cloneNode(false).play();
let node = audioBufferWeakMap.get(window).cloneNode(false);
node.volume = this._volumeSetting.value;
node.play();
}
}
}
@ -549,6 +584,7 @@ var Output = {
start: function start() {
Cu.import('resource://gre/modules/Geometry.jsm');
this.speechHelper.init();
},
stop: function stop() {
@ -561,6 +597,8 @@ var Output = {
Utils.win.document.documentElement.removeChild(this.announceBox.get());
delete this.announceBox;
}
this.speechHelper.uninit();
},
Speech: function Speech(aDetails, aBrowser) {