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// Copyright (c) 2013 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.
/**
* States that the extension can be in.
*/
var StateEnum = {
DISABLED: 'disabled',
DISPLAY: 'display',
SYSTEM: 'system'
};
/**
* Key used for storing the current state in {localStorage}.
*/
var STATE_KEY = 'state';
/**
* Should the old {chrome.experimental.power} API be used rather than
* {chrome.power}?
*/
var useOldApi = !chrome.power;
/**
* Loads the locally-saved state asynchronously.
* @param {function} callback Callback invoked with the loaded {StateEnum}.
*/
function loadSavedState(callback) {
chrome.storage.local.get(STATE_KEY, function(items) {
var savedState = items[STATE_KEY];
for (var key in StateEnum) {
if (savedState == StateEnum[key]) {
callback(savedState);
return;
}
}
callback(StateEnum.DISABLED);
});
}
/**
* Switches to a new state.
* @param {string} newState New {StateEnum} to use.
*/
function setState(newState) {
var imagePrefix = 'night';
var title = '';
// The old API doesn't support the "system" level.
if (useOldApi && newState == StateEnum.SYSTEM)
newState = StateEnum.DISPLAY;
switch (newState) {
case StateEnum.DISABLED:
(useOldApi ? chrome.experimental.power : chrome.power).releaseKeepAwake();
imagePrefix = 'night';
title = chrome.i18n.getMessage('disabledTitle');
break;
case StateEnum.DISPLAY:
if (useOldApi)
chrome.experimental.power.requestKeepAwake(function() {});
else
chrome.power.requestKeepAwake('display');
imagePrefix = 'day';
title = chrome.i18n.getMessage('displayTitle');
break;
case StateEnum.SYSTEM:
chrome.power.requestKeepAwake('system');
imagePrefix = 'sunset';
title = chrome.i18n.getMessage('systemTitle');
break;
default:
throw 'Invalid state "' + newState + '"';
}
var items = {};
items[STATE_KEY] = newState;
chrome.storage.local.set(items);
chrome.browserAction.setIcon({
path: {
'19': 'images/' + imagePrefix + '-19.png',
'38': 'images/' + imagePrefix + '-38.png'
}
});
chrome.browserAction.setTitle({title: title});
}
chrome.browserAction.onClicked.addListener(function() {
loadSavedState(function(state) {
switch (state) {
case StateEnum.DISABLED:
setState(StateEnum.DISPLAY);
break;
case StateEnum.DISPLAY:
setState(useOldApi ? StateEnum.DISABLED : StateEnum.SYSTEM);
break;
case StateEnum.SYSTEM:
setState(StateEnum.DISABLED);
break;
default:
throw 'Invalid state "' + state + '"';
}
});
});
chrome.runtime.onStartup.addListener(function() {
loadSavedState(function(state) { setState(state); });
});
// TODO(derat): Remove this once http://crbug.com/222473 is fixed.
chrome.windows.onCreated.addListener(function() {
loadSavedState(function(state) { setState(state); });
});
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