#

API Documentation for: NEXT
Show: Inherited Protected Private Deprecated

# File:easeljs\ui\ButtonHelper.js

    /*
    * ButtonHelper
    * 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.
    */

    /**
     * @module EaselJS
     */

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

    (function() {
    	"use strict";

    // constructor:
    	/**
    	 * The ButtonHelper is a helper class to create interactive buttons from {{#crossLink "MovieClip"}}{{/crossLink}} or
    	 * {{#crossLink "Sprite"}}{{/crossLink}} instances. This class will intercept mouse events from an object, and
    	 * automatically call {{#crossLink "Sprite/gotoAndStop"}}{{/crossLink}} or {{#crossLink "Sprite/gotoAndPlay"}}{{/crossLink}},
    	 * to the respective animation labels, add a pointer cursor, and allows the user to define a hit state frame.
    	 *
    	 * The ButtonHelper instance does not need to be added to the stage, but a reference should be maintained to prevent
    	 * garbage collection.
    	 *
    	 * Note that over states will not work unless you call {{#crossLink "Stage/enableMouseOver"}}{{/crossLink}}.
    	 *
    	 * <h4>Example</h4>
    	 *
    	 *      var helper = new createjs.ButtonHelper(myInstance, "out", "over", "down", false, myInstance, "hit");
    	 *      myInstance.addEventListener("click", handleClick);
    	 *      function handleClick(event) {
    	 *          // Click Happened.
    	 *      }
    	 *
    	 * @class ButtonHelper
    	 * @param {Sprite|MovieClip} target The instance to manage.
    	 * @param {String} [outLabel="out"] The label or animation to go to when the user rolls out of the button.
    	 * @param {String} [overLabel="over"] The label or animation to go to when the user rolls over the button.
    	 * @param {String} [downLabel="down"] The label or animation to go to when the user presses the button.
    	 * @param {Boolean} [play=false] If the helper should call "gotoAndPlay" or "gotoAndStop" on the button when changing
    	 * states.
    	 * @param {DisplayObject} [hitArea] An optional item to use as the hit state for the button. If this is not defined,
    	 * then the button's visible states will be used instead. Note that the same instance as the "target" argument can be
    	 * used for the hitState.
    	 * @param {String} [hitLabel] The label or animation on the hitArea instance that defines the hitArea bounds. If this is
    	 * null, then the default state of the hitArea will be used. *
    	 * @constructor
    	 */
    	function ButtonHelper(target, outLabel, overLabel, downLabel, play, hitArea, hitLabel) {
    		if (!target.addEventListener) { return; }

    	// public properties:
    		/**
    		 * The target for this button helper.
    		 * @property target
    		 * @type MovieClip | Sprite
    		 * @readonly
    		 **/
    		this.target = target;

    		/**
    		 * The label name or frame number to display when the user mouses out of the target. Defaults to "over".
    		 * @property overLabel
    		 * @type String | Number
    		 **/
    		this.overLabel = overLabel == null ? "over" : overLabel;

    		/**
    		 * The label name or frame number to display when the user mouses over the target. Defaults to "out".
    		 * @property outLabel
    		 * @type String | Number
    		 **/
    		this.outLabel = outLabel == null ? "out" : outLabel;

    		/**
    		 * The label name or frame number to display when the user presses on the target. Defaults to "down".
    		 * @property downLabel
    		 * @type String | Number
    		 **/
    		this.downLabel = downLabel == null ? "down" : downLabel;

    		/**
    		 * If true, then ButtonHelper will call gotoAndPlay, if false, it will use gotoAndStop. Default is false.
    		 * @property play
    		 * @default false
    		 * @type Boolean
    		 **/
    		this.play = play;

    	//  private properties
    		/**
    		 * @property _isPressed
    		 * @type Boolean
    		 * @protected
    		 **/
    		this._isPressed = false;

    		/**
    		 * @property _isOver
    		 * @type Boolean
    		 * @protected
    		 **/
    		this._isOver = false;

    		/**
    		 * @property _enabled
    		 * @type Boolean
    		 * @protected
    		 **/
    		this._enabled = false;

    	// setup:
    		target.mouseChildren = false; // prevents issues when children are removed from the display list when state changes.
    		this.enabled = true;
    		this.handleEvent({});
    		if (hitArea) {
    			if (hitLabel) {
    				hitArea.actionsEnabled = false;
    				hitArea.gotoAndStop&&hitArea.gotoAndStop(hitLabel);
    			}
    			target.hitArea = hitArea;
    		}
    	}
    	var p = ButtonHelper.prototype;

    	/**
    	 * <strong>REMOVED</strong>. Removed in favor of using `MySuperClass_constructor`.
    	 * See {{#crossLink "Utility Methods/extend"}}{{/crossLink}} and {{#crossLink "Utility Methods/promote"}}{{/crossLink}}
    	 * for details.
    	 *
    	 * There is an inheritance tutorial distributed with EaselJS in /tutorials/Inheritance.
    	 *
    	 * @method initialize
    	 * @protected
    	 * @deprecated
    	 */
    	// p.initialize = function() {}; // searchable for devs wondering where it is.

    // getter / setters:
    	/**
    	 * Use the {{#crossLink "ButtonHelper/enabled:property"}}{{/crossLink}} property instead.
    	 * @method setEnabled
    	 * @param {Boolean} value
    	 * @deprecated
    	 **/
    	p.setEnabled = function(value) { // TODO: deprecated.
    		if (value == this._enabled) { return; }
    		var o = this.target;
    		this._enabled = value;
    		if (value) {
    			o.cursor = "pointer";
    			o.addEventListener("rollover", this);
    			o.addEventListener("rollout", this);
    			o.addEventListener("mousedown", this);
    			o.addEventListener("pressup", this);
    			if (o._reset) { o.__reset = o._reset; o._reset = this._reset;}
    		} else {
    			o.cursor = null;
    			o.removeEventListener("rollover", this);
    			o.removeEventListener("rollout", this);
    			o.removeEventListener("mousedown", this);
    			o.removeEventListener("pressup", this);
    			if (o.__reset) { o._reset = o.__reset; delete(o.__reset); }
    		}
    	};
    	/**
    	 * Use the {{#crossLink "ButtonHelper/enabled:property"}}{{/crossLink}} property instead.
    	 * @method getEnabled
    	 * @return {Boolean}
    	 * @deprecated
    	 **/
    	p.getEnabled = function() {
    		return this._enabled;
    	};

    	/**
    	 * Enables or disables the button functionality on the target.
    	 * @property enabled
    	 * @type {Boolean}
    	 **/
    	try {
    		Object.defineProperties(p, {
    			enabled: { get: p.getEnabled, set: p.setEnabled }
    		});
    	} catch (e) {} // TODO: use Log

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

    // private methods:
    	/**
    	 * @method handleEvent
    	 * @param {Object} evt The mouse event to handle.
    	 * @protected
    	 **/
    	p.handleEvent = function(evt) {
    		var label, t = this.target, type = evt.type;
    		if (type == "mousedown") {
    			this._isPressed = true;
    			label = this.downLabel;
    		} else if (type == "pressup") {
    			this._isPressed = false;
    			label = this._isOver ? this.overLabel : this.outLabel;
    		} else if (type == "rollover") {
    			this._isOver = true;
    			label = this._isPressed ? this.downLabel : this.overLabel;
    		} else { // rollout and default
    			this._isOver = false;
    			label = this._isPressed ? this.overLabel : this.outLabel;
    		}
    		if (this.play) {
    			t.gotoAndPlay&&t.gotoAndPlay(label);
    		} else {
    			t.gotoAndStop&&t.gotoAndStop(label);
    		}
    	};

    	/**
    	 * Injected into target. Preserves the paused state through a reset.
    	 * @method _reset
    	 * @protected
    	 **/
    	p._reset = function() {
    		// TODO: explore better ways to handle this issue. This is hacky & disrupts object signatures.
    		var p = this.paused;
    		this.__reset();
    		this.paused = p;
    	};

    	createjs.ButtonHelper = ButtonHelper;
    }());