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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 Accesses Chrome's tabs extension API and gives
* feedback for events that happen in the "Chrome of Chrome".
*/
goog.provide('cvox.TabsApiHandler');
goog.require('cvox.AbstractEarcons');
goog.require('cvox.AbstractTts');
goog.require('cvox.BrailleInterface');
goog.require('cvox.ChromeVox');
goog.require('cvox.NavBraille');
/**
* Class that adds listeners and handles events from the tabs API.
* @constructor
* @param {cvox.TtsInterface} tts The TTS to use for speaking.
* @param {cvox.BrailleInterface} braille The braille interface to use for
* brailling.
* @param {cvox.AbstractEarcons} earcons The earcons object to use for playing
* earcons.
*/
cvox.TabsApiHandler = function(tts, braille, earcons) {
/** @type {cvox.TtsInterface} @private */
this.tts_ = tts;
/** @type {cvox.BrailleInterface} @private */
this.braille_ = braille;
/** @type {cvox.AbstractEarcons} @private */
this.earcons_ = earcons;
/** @type {function(string, Array<string>=)} @private */
this.msg_ = cvox.ChromeVox.msgs.getMsg.bind(cvox.ChromeVox.msgs);
/**
* Tracks whether the active tab has finished loading.
* @type {boolean}
* @private
*/
this.lastActiveTabLoaded_ = false;
chrome.tabs.onCreated.addListener(this.onCreated.bind(this));
chrome.tabs.onRemoved.addListener(this.onRemoved.bind(this));
chrome.tabs.onActivated.addListener(this.onActivated.bind(this));
chrome.tabs.onUpdated.addListener(this.onUpdated.bind(this));
chrome.windows.onFocusChanged.addListener(this.onFocusChanged.bind(this));
};
cvox.TabsApiHandler.prototype = {
/**
* Handles chrome.tabs.onCreated.
* @param {Object} tab
*/
onCreated: function(tab) {
if (!cvox.ChromeVox.isActive) {
return;
}
this.tts_.speak(this.msg_('chrome_tab_created'),
cvox.QueueMode.FLUSH,
cvox.AbstractTts.PERSONALITY_ANNOUNCEMENT);
this.braille_.write(
cvox.NavBraille.fromText(this.msg_('chrome_tab_created')));
this.earcons_.playEarcon(cvox.AbstractEarcons.OBJECT_OPEN);
},
/**
* Handles chrome.tabs.onRemoved.
* @param {Object} tab
*/
onRemoved: function(tab) {
if (!cvox.ChromeVox.isActive) {
return;
}
this.earcons_.playEarcon(cvox.AbstractEarcons.OBJECT_CLOSE);
},
/**
* Handles chrome.tabs.onActivated.
* @param {Object} activeInfo
*/
onActivated: function(activeInfo) {
if (!cvox.ChromeVox.isActive) {
return;
}
chrome.tabs.get(activeInfo.tabId, function(tab) {
this.lastActiveTabLoaded_ = tab.status == 'complete';
if (tab.status == 'loading') {
return;
}
var title = tab.title ? tab.title : tab.url;
this.tts_.speak(this.msg_('chrome_tab_selected',
[title]),
cvox.QueueMode.FLUSH,
cvox.AbstractTts.PERSONALITY_ANNOUNCEMENT);
this.braille_.write(
cvox.NavBraille.fromText(this.msg_('chrome_tab_selected', [title])));
this.earcons_.playEarcon(cvox.AbstractEarcons.OBJECT_SELECT);
}.bind(this));
},
/**
* Handles chrome.tabs.onUpdated.
* @param {number} tabId
* @param {Object} selectInfo
*/
onUpdated: function(tabId, selectInfo) {
if (!cvox.ChromeVox.isActive) {
return;
}
chrome.tabs.get(tabId, function(tab) {
if (!tab.active) {
return;
}
if (tab.status == 'loading') {
this.lastActiveTabLoaded_ = false;
this.earcons_.playEarcon(cvox.AbstractEarcons.BUSY_PROGRESS_LOOP);
} else if (!this.lastActiveTabLoaded_) {
this.lastActiveTabLoaded_ = true;
this.earcons_.playEarcon(cvox.AbstractEarcons.TASK_SUCCESS);
}
}.bind(this));
},
/**
* Handles chrome.windows.onFocusChanged.
* @param {number} windowId
*/
onFocusChanged: function(windowId) {
if (!cvox.ChromeVox.isActive) {
return;
}
if (windowId == chrome.windows.WINDOW_ID_NONE) {
return;
}
chrome.windows.get(windowId, function(window) {
chrome.tabs.getSelected(windowId, function(tab) {
var msgId = window.incognito ? 'chrome_incognito_window_selected' :
'chrome_normal_window_selected';
var title = tab.title ? tab.title : tab.url;
this.tts_.speak(this.msg_(msgId, [title]),
cvox.QueueMode.FLUSH,
cvox.AbstractTts.PERSONALITY_ANNOUNCEMENT);
this.braille_.write(
cvox.NavBraille.fromText(this.msg_(msgId, [title])));
this.earcons_.playEarcon(cvox.AbstractEarcons.OBJECT_SELECT);
}.bind(this));
}.bind(this));
}
};
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