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/*
* This file is part of Adblock Plus <http://adblockplus.org/>,
* Copyright (C) 2006-2014 Eyeo GmbH
*
* Adblock Plus is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Adblock Plus is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @fileOverview This component manages listeners and calls them to distributes
* messages about filter changes.
*/
/**
* List of registered listeners
* @type Array of function(action, item, newValue, oldValue)
*/
let listeners = [];
/**
* This class allows registering and triggering listeners for filter events.
* @class
*/
let FilterNotifier = exports.FilterNotifier =
{
/**
* Adds a listener
*/
addListener: function(/**function(action, item, newValue, oldValue)*/ listener)
{
if (listeners.indexOf(listener) >= 0)
return;
listeners.push(listener);
},
/**
* Removes a listener that was previosly added via addListener
*/
removeListener: function(/**function(action, item, newValue, oldValue)*/ listener)
{
let index = listeners.indexOf(listener);
if (index >= 0)
listeners.splice(index, 1);
},
/**
* Notifies listeners about an event
* @param {String} action event code ("load", "save", "elemhideupdate",
* "subscription.added", "subscription.removed",
* "subscription.disabled", "subscription.title",
* "subscription.lastDownload", "subscription.downloadStatus",
* "subscription.homepage", "subscription.updated",
* "filter.added", "filter.removed", "filter.moved",
* "filter.disabled", "filter.hitCount", "filter.lastHit")
* @param {Subscription|Filter} item item that the change applies to
*/
triggerListeners: function(action, item, param1, param2, param3)
{
let list = listeners.slice();
for (let listener of list)
listener(action, item, param1, param2, param3);
}
};
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