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// Copyright 2015 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 Common prefs behavior.
*/
/** @polymerBehavior */
var PrefsBehavior = {
/**
* Gets the pref at the given prefPath. Throws if the pref is not found.
* @param {string} prefPath
* @return {!chrome.settingsPrivate.PrefObject}
* @protected
*/
getPref: function(prefPath) {
var pref = /** @type {!chrome.settingsPrivate.PrefObject} */(
this.get(prefPath, this.prefs));
assert(typeof pref != 'undefined', 'Pref is missing: ' + prefPath);
return pref;
},
/**
* Sets the value of the pref at the given prefPath. Throws if the pref is not
* found.
* @param {string} prefPath
* @param {*} value
* @protected
*/
setPrefValue: function(prefPath, value) {
this.getPref(prefPath); // Ensures we throw if the pref is not found.
this.set('prefs.' + prefPath + '.value', value);
},
/**
* Appends the item to the pref list at the given key if the item is not
* already in the list. Asserts if the pref itself is not found or is not an
* Array type.
* @param {string} key
* @param {*} item
* @protected
*/
appendPrefListItem: function(key, item) {
var pref = this.getPref(key);
assert(pref && pref.type == chrome.settingsPrivate.PrefType.LIST);
if (pref.value.indexOf(item) == -1)
this.push('prefs.' + key + '.value', item);
},
/**
* Deletes the given item from the pref at the given key if the item is found.
* Asserts if the pref itself is not found or is not an Array type.
* @param {string} key
* @param {*} item
* @protected
*/
deletePrefListItem: function(key, item) {
assert(this.getPref(key).type == chrome.settingsPrivate.PrefType.LIST);
this.arrayDelete('prefs.' + key + '.value', item);
},
};
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