mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-17 16:26:39 +03:00
Joey Parrish
137 lines
3.4 KiB
JavaScript
137 lines
3.4 KiB
JavaScript
/**
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* Copyright 2014 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @fileoverview EventManager class.
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*/
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goog.provide('shaka.util.EventManager');
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goog.require('shaka.asserts');
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goog.require('shaka.util.MultiMap');
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/**
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* Creates a new EventManager. An EventManager maintains a collection of "event
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* bindings" between event targets and event listeners.
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* @constructor
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*/
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shaka.util.EventManager = function() {
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/**
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* Maps an event type to an array of event bindings.
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* @private {shaka.util.MultiMap.<!shaka.util.EventManager.Binding_>}
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*/
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this.bindingMap_ = new shaka.util.MultiMap();
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};
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/**
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* @typedef {function(!Event)}
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*/
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shaka.util.EventManager.ListenerType;
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/**
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* Destroys the shaka.util.EventManager. All event listeners are detached.
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*/
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shaka.util.EventManager.prototype.destroy = function() {
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this.removeAll();
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this.bindingMap_ = null;
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};
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/**
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* Attaches an event listener to an event target.
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* @param {!EventTarget} target The event target.
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* @param {string} type The event type.
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* @param {shaka.util.EventManager.ListenerType} listener The event listener.
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*/
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shaka.util.EventManager.prototype.listen = function(target, type, listener) {
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var binding = new shaka.util.EventManager.Binding_(target, type, listener);
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this.bindingMap_.push(type, binding);
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};
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/**
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* Detaches an event listener from an event target.
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* @param {!EventTarget} target The event target.
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* @param {string} type The event type.
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*/
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shaka.util.EventManager.prototype.unlisten = function(target, type) {
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var list = this.bindingMap_.get(type) || [];
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for (var i = 0; i < list.length; ++i) {
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var binding = list[i];
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if (binding.target == target) {
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binding.unlisten();
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this.bindingMap_.remove(type, binding);
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}
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}
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};
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/**
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* Detaches all event listeners from all targets.
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*/
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shaka.util.EventManager.prototype.removeAll = function() {
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var list = this.bindingMap_.getAll();
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for (var i = 0; i < list.length; ++i) {
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list[i].unlisten();
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}
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this.bindingMap_.clear();
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};
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/**
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* Creates a new Binding_ and attaches the event listener to the event target.
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* @param {!EventTarget} target The event target.
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* @param {string} type The event type.
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* @param {shaka.util.EventManager.ListenerType} listener The event listener.
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* @constructor
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* @private
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*/
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shaka.util.EventManager.Binding_ = function(target, type, listener) {
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/** @type {EventTarget} */
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this.target = target;
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/** @type {string} */
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this.type = type;
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/** @type {?shaka.util.EventManager.ListenerType} */
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this.listener = listener;
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this.target.addEventListener(type, listener, false);
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};
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/**
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* Detaches the event listener from the event target. This does nothing if the
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* event listener is already detached.
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*/
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shaka.util.EventManager.Binding_.prototype.unlisten = function() {
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if (!this.target)
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return;
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this.target.removeEventListener(this.type, this.listener, false);
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this.target = null;
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this.listener = null;
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};
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