#

API Documentation for: NEXT
Show: Inherited Protected Private Deprecated

# File:Event.js

    /*
    * Event
    * Visit http://createjs.com/ for documentation, updates and examples.
    *
    * Copyright (c) 2010 gskinner.com, inc.
    *
    * Permission is hereby granted, free of charge, to any person
    * obtaining a copy of this software and associated documentation
    * files (the "Software"), to deal in the Software without
    * restriction, including without limitation the rights to use,
    * copy, modify, merge, publish, distribute, sublicense, and/or sell
    * copies of the Software, and to permit persons to whom the
    * Software is furnished to do so, subject to the following
    * conditions:
    *
    * The above copyright notice and this permission notice shall be
    * included in all copies or substantial portions of the Software.
    *
    * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
    * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
    * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    * OTHER DEALINGS IN THE SOFTWARE.
    */

    /**
     * A collection of Classes that are shared across all the CreateJS libraries.  The classes are included in the minified
     * files of each library and are available on the createjs namespace directly.
     *
     * <h4>Example</h4>
     *
     *      myObject.addEventListener("change", createjs.proxy(myMethod, scope));
     *
     * @module CreateJS
     * @main CreateJS
     */

    // namespace:
    this.createjs = this.createjs||{};

    (function() {
    	"use strict";

    // constructor:
    	/**
    	 * Contains properties and methods shared by all events for use with
    	 * {{#crossLink "EventDispatcher"}}{{/crossLink}}.
    	 *
    	 * Note that Event objects are often reused, so you should never
    	 * rely on an event object's state outside of the call stack it was received in.
    	 * @class Event
    	 * @param {String} type The event type.
    	 * @param {Boolean} bubbles Indicates whether the event will bubble through the display list.
    	 * @param {Boolean} cancelable Indicates whether the default behaviour of this event can be cancelled.
    	 * @constructor
    	 **/
    	function Event(type, bubbles, cancelable) {

    	// public properties:
    		/**
    		 * The type of event.
    		 * @property type
    		 * @type String
    		 **/
    		this.type = type;

    		/**
    		 * The object that generated an event.
    		 * @property target
    		 * @type Object
    		 * @default null
    		 * @readonly
    		*/
    		this.target = null;

    		/**
    		 * The current target that a bubbling event is being dispatched from. For non-bubbling events, this will
    		 * always be the same as target. For example, if childObj.parent = parentObj, and a bubbling event
    		 * is generated from childObj, then a listener on parentObj would receive the event with
    		 * target=childObj (the original target) and currentTarget=parentObj (where the listener was added).
    		 * @property currentTarget
    		 * @type Object
    		 * @default null
    		 * @readonly
    		*/
    		this.currentTarget = null;

    		/**
    		 * For bubbling events, this indicates the current event phase:<OL>
    		 * 	<LI> capture phase: starting from the top parent to the target</LI>
    		 * 	<LI> at target phase: currently being dispatched from the target</LI>
    		 * 	<LI> bubbling phase: from the target to the top parent</LI>
    		 * </OL>
    		 * @property eventPhase
    		 * @type Number
    		 * @default 0
    		 * @readonly
    		*/
    		this.eventPhase = 0;

    		/**
    		 * Indicates whether the event will bubble through the display list.
    		 * @property bubbles
    		 * @type Boolean
    		 * @default false
    		 * @readonly
    		*/
    		this.bubbles = !!bubbles;

    		/**
    		 * Indicates whether the default behaviour of this event can be cancelled via
    		 * {{#crossLink "Event/preventDefault"}}{{/crossLink}}. This is set via the Event constructor.
    		 * @property cancelable
    		 * @type Boolean
    		 * @default false
    		 * @readonly
    		*/
    		this.cancelable = !!cancelable;

    		/**
    		 * The epoch time at which this event was created.
    		 * @property timeStamp
    		 * @type Number
    		 * @default 0
    		 * @readonly
    		*/
    		this.timeStamp = (new Date()).getTime();

    		/**
    		 * Indicates if {{#crossLink "Event/preventDefault"}}{{/crossLink}} has been called
    		 * on this event.
    		 * @property defaultPrevented
    		 * @type Boolean
    		 * @default false
    		 * @readonly
    		*/
    		this.defaultPrevented = false;

    		/**
    		 * Indicates if {{#crossLink "Event/stopPropagation"}}{{/crossLink}} or
    		 * {{#crossLink "Event/stopImmediatePropagation"}}{{/crossLink}} has been called on this event.
    		 * @property propagationStopped
    		 * @type Boolean
    		 * @default false
    		 * @readonly
    		*/
    		this.propagationStopped = false;

    		/**
    		 * Indicates if {{#crossLink "Event/stopImmediatePropagation"}}{{/crossLink}} has been called
    		 * on this event.
    		 * @property immediatePropagationStopped
    		 * @type Boolean
    		 * @default false
    		 * @readonly
    		*/
    		this.immediatePropagationStopped = false;

    		/**
    		 * Indicates if {{#crossLink "Event/remove"}}{{/crossLink}} has been called on this event.
    		 * @property removed
    		 * @type Boolean
    		 * @default false
    		 * @readonly
    		*/
    		this.removed = false;
    	}
    	var p = Event.prototype;

    // public methods:
    	/**
    	 * Sets {{#crossLink "Event/defaultPrevented"}}{{/crossLink}} to true if the event is cancelable.
    	 * Mirrors the DOM level 2 event standard. In general, cancelable events that have `preventDefault()` called will
    	 * cancel the default behaviour associated with the event.
    	 * @method preventDefault
    	 **/
    	p.preventDefault = function() {
    		this.defaultPrevented = this.cancelable&&true;
    	};

    	/**
    	 * Sets {{#crossLink "Event/propagationStopped"}}{{/crossLink}} to true.
    	 * Mirrors the DOM event standard.
    	 * @method stopPropagation
    	 **/
    	p.stopPropagation = function() {
    		this.propagationStopped = true;
    	};

    	/**
    	 * Sets {{#crossLink "Event/propagationStopped"}}{{/crossLink}} and
    	 * {{#crossLink "Event/immediatePropagationStopped"}}{{/crossLink}} to true.
    	 * Mirrors the DOM event standard.
    	 * @method stopImmediatePropagation
    	 **/
    	p.stopImmediatePropagation = function() {
    		this.immediatePropagationStopped = this.propagationStopped = true;
    	};

    	/**
    	 * Causes the active listener to be removed via removeEventListener();
    	 *
    	 * 		myBtn.addEventListener("click", function(evt) {
    	 * 			// do stuff...
    	 * 			evt.remove(); // removes this listener.
    	 * 		});
    	 *
    	 * @method remove
    	 **/
    	p.remove = function() {
    		this.removed = true;
    	};

    	/**
    	 * Returns a clone of the Event instance.
    	 * @method clone
    	 * @return {Event} a clone of the Event instance.
    	 **/
    	p.clone = function() {
    		return new Event(this.type, this.bubbles, this.cancelable);
    	};

    	/**
    	 * Provides a chainable shortcut method for setting a number of properties on the instance.
    	 *
    	 * @method set
    	 * @param {Object} props A generic object containing properties to copy to the instance.
    	 * @return {Event} Returns the instance the method is called on (useful for chaining calls.)
    	 * @chainable
    	*/
    	p.set = function(props) {
    		for (var n in props) { this[n] = props[n]; }
    		return this;
    	};

    	/**
    	 * Returns a string representation of this object.
    	 * @method toString
    	 * @return {String} a string representation of the instance.
    	 **/
    	p.toString = function() {
    		return "[Event (type="+this.type+")]";
    	};

    	createjs.Event = Event;
    }());