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// Copyright (c) 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 Script that runs on the background page.
*/
CONTENT_SCRIPTS = [
'accessibility_utils.js',
'traverse_util.js',
'caret_browsing.js'
];
/**
* The class handling the Caret Browsing background page, which keeps
* track of the current state, handles the browser action button, and
* initializes the content script in all running tabs when the extension
* is first loaded.
* @constructor
*/
var CaretBkgnd = function() {};
/**
* Flag indicating whether caret browsing is enabled. Global, applies to
* all tabs simultaneously.
* @type {boolean}
*/
CaretBkgnd.isEnabled;
/**
* Change the browser action icon and tooltip based on the enabled state.
*/
CaretBkgnd.setIcon = function() {
chrome.browserAction.setIcon(
{'path': CaretBkgnd.isEnabled ?
'../caret_19_on.png' :
'../caret_19.png'});
chrome.browserAction.setTitle(
{'title': CaretBkgnd.isEnabled ?
'Turn Off Caret Browsing (F7)' :
'Turn On Caret Browsing (F7)' });
};
/**
* This is called when the extension is first loaded, so that it can be
* immediately used in all already-open tabs. It's not needed for any
* new tabs that open after that, the content script will be automatically
* injected into any new tab.
*/
CaretBkgnd.injectContentScripts = function() {
chrome.windows.getAll({'populate': true}, function(windows) {
for (var i = 0; i < windows.length; i++) {
var tabs = windows[i].tabs;
for (var j = 0; j < tabs.length; j++) {
for (var k = 0; k < CONTENT_SCRIPTS.length; k++) {
chrome.tabs.executeScript(
tabs[j].id,
{file: CONTENT_SCRIPTS[k], allFrames: true},
function(result) {
// Ignore.
chrome.runtime.lastError;
});
}
}
}
});
};
/**
* Toggle caret browsing on or off, and update the browser action icon and
* all open tabs.
*/
CaretBkgnd.toggle = function() {
CaretBkgnd.isEnabled = !CaretBkgnd.isEnabled;
var obj = {};
obj['enabled'] = CaretBkgnd.isEnabled;
chrome.storage.sync.set(obj);
CaretBkgnd.setIcon();
};
/**
* Initialize the background script. Set the initial value of the flag
* based on the saved preference in localStorage, update the browser action,
* inject into running tabs, and then set up communication with content
* scripts in tabs. Also check for prefs updates (from the options page)
* and send them to content scripts.
*/
CaretBkgnd.init = function() {
chrome.storage.sync.get('enabled', function(result) {
CaretBkgnd.isEnabled = result['enabled'];
CaretBkgnd.setIcon();
CaretBkgnd.injectContentScripts();
chrome.browserAction.onClicked.addListener(function(tab) {
CaretBkgnd.toggle();
});
});
chrome.storage.onChanged.addListener(function() {
chrome.storage.sync.get('enabled', function(result) {
CaretBkgnd.isEnabled = result['enabled'];
CaretBkgnd.setIcon();
});
});
};
CaretBkgnd.init();
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