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    <div class="main">
        <h1 class="page-title" data-filename="pixi_list.js.html">Source: pixi/list.js</h1>
        


    
    <section>
        <header>
            <div class="header content-size">
                <h2>pixi/list.js</h2>
            </div>
        </header>
        <article>
            <pre id="source-code" class="prettyprint source linenums"><code>/* globals */

/* Imports */
import Events from '../events.js'

/**
 * Class that represents a PixiJS List.
 *
 * @example
 * const elephant1 = PIXI.Sprite.fromImage('./assets/elephant-1.jpg')
 * const elephant2 = PIXI.Sprite.fromImage('./assets/elephant-2.jpg')
 * 
 * // Create the list
 * const list = new List([elephant1, elephant2])
 * 
 * app.scene.addChild(list)
 *
 * @class
 * @extends PIXI.Container
 * @see {@link http://pixijs.download/dev/docs/PIXI.Container.html|PixiJS Container}
 * @see {@link https://www.iwm-tuebingen.de/iwmbrowser/lib/pixi/list.html|DocTest}
 */
export default class List extends PIXI.Container {

    /**
     * Creates an instance of a Flippable.
     *
     * @constructor
     * @param {PIXI.DisplayObject[]} items - An array of PIXI.DisplayObjects.
     * @param {object} [opts] - An options object which can contain the following properties.
     * @param {number} [opts.width] - The width of the list. If the items are larger than this width, the overflow
     *     will be hidden.
     * @param {number} [opts.height] - The height of the list. If the items are larger than this height, the overflow
     *     will be hidden.
     * @param {number} [opts.padding=10] - The inner spacing (distance from one item to the previous/next item).
     * @param {number} [opts.margin=10] - The outer spacing (distance from one item to the border).
     * @param {string} [opts.orientation=vertical] - The orientation of the button group. Can be horizontal or vertical.
     * @param {string} [opts.align=left] - The horizontal position of the items. Possible values are
     *     left, center and right.
     * @param {string} [opts.verticalAlign=middle] - The vertical position of the items. Possible values are
     *     top, middle and bottom.
     * @param {PIXI.Application} [opts.app] - The PixiJS Application. Must be set if you want to use the mousewheel to
     *     scroll your list.
     */
    constructor(items = [], opts = {}) {

        super()

        this.opts = Object.assign({}, {
            padding: 10,
            margin: 10,
            orientation: 'vertical',
            align: 'left',
            verticalAlign: 'middle',
            width: null,
            height: null,
            app: null
        }, opts)

        this.__items = items
        this.__dragging = false

        // setup
        //--------------------
        this.setup()
    }

    /**
     * Creates children and instantiates everything.
     *
     * @private
     * @return {List} A reference to the list for chaining.
     */
    setup() {

        // inner container
        //--------------------
        const container = new PIXI.Container()
        this.addChild(container)
        this.container = container

        // mask
        //--------------------
        const mask = new PIXI.Graphics()
        this.addChild(mask)
        this.__mask = mask

        // add items
        //--------------------
        for(let item of this.__items) {
            container.addChild(item)
        }

        // interaction
        //--------------------
        this.interactive = this.opts.width || this.opts.height
        this.on('pointerdown', this.onStart.bind(this))
        this.on('pointermove', this.onMove.bind(this))
        this.on('pointerup', this.onEnd.bind(this))
        this.on('pointercancel', this.onEnd.bind(this))
        this.on('pointerout', this.onEnd.bind(this))
        this.on('pointerupoutside', this.onEnd.bind(this))
        this.on('scroll', this.onScroll.bind(this))

        // mousewheel
        //--------------------
        if (this.opts.app) {
            const app = this.opts.app
            app.view.addEventListener('mousewheel', event => {
                const bounds = this.mask ? this.mask.getBounds() : this.getBounds()
                const x = event.clientX - app.view.getBoundingClientRect().left
                const y = event.clientY - app.view.getBoundingClientRect().top
                if (bounds.contains(x, y)) {
                    event.preventDefault()
                    this.emit('scroll', event)
                }
            })
        }

        this.layout()

        return this
    }

    /**
     * Replaces the existing items and relayouts the list.
     *
     * @param {PIXI.DisplayObject[]} items - An array of PIXI.DisplayObjects.
     * @return {List} A reference to the list for chaining.
     */
    setItems(items) {
        this.container.removeChildren()
        this.__items = items
        for(let item of this.__items) {
            this.container.addChild(item)
        }
        this.layout()
    }

    /**
     * Should be called to refresh the layout of the list (the width or the height).
     *
     * @return {List} A reference to the list for chaining.
     */
    layout() {

        const margin = this.opts.margin

        let x = margin
        let y = margin

        for (let item of this.__items) {

            item.x = x
            item.y = y

            if (this.opts.orientation === 'vertical') {
                y += item.height + this.opts.padding
            } else {
                x += item.width + this.opts.padding
            }
        }

        // vertical
        //--------------------
        if (this.opts.orientation === 'vertical') {
            switch (this.opts.align) {
                case 'center':
                    this.__items.forEach(it => it.x = margin + this.width / 2 - it.width / 2)
                    break
                case 'right':
                    this.__items.forEach(it => it.x = margin + this.width - it.width)
                    break
                default:
                    this.__items.forEach(it => it.x = margin)
                    break
            }

            if (this.opts.height) {
                const mask = this.__mask
                mask.clear()
                mask.beginFill(0x000)
                mask.drawRect(0, 0, this.width + 2 * margin, this.opts.height)
                this.mask = mask

                this.interactive = this.innerHeight > this.opts.height
            }
        }

        // horizontal
        //--------------------
        if (this.opts.orientation === 'horizontal') {
            switch (this.opts.verticalAlign) {
                case 'top':
                    this.__items.forEach(it => it.y = margin)
                    break
                case 'bottom':
                    this.__items.forEach(it => it.y = margin + this.height - it.height)
                    break
                default:
                    this.__items.forEach(it => it.y = margin + this.height / 2 - it.height / 2)
                    break
            }

            if (this.opts.width) {
                const mask = this.__mask
                mask.clear()
                mask.beginFill(0x000)
                mask.drawRect(0, 0, this.opts.width, this.height + 2 * margin)
                this.mask = mask

                this.interactive = this.innerWidth > this.opts.width
            }
        }

        return this
    }

    /**
     * 
     */
    get innerWidth() {

        let size = 0

        this.__items.forEach(it => size += it.width)
        size += this.opts.padding * (this.__items.length - 1)
        size += 2 * this.opts.margin

        return size
    }

    /**
     * 
     */
    get innerHeight() {

        let size = 0

        this.__items.forEach(it => size += it.height)
        size += this.opts.padding * (this.__items.length - 1)
        size += 2 * this.opts.margin

        return size
    }

    /**
     * Resizes the list.
     * 
     * @param {number} widthOrHeight - The new width (if orientation is horizontal) or height (if orientation is vertical) of the list.
     */
    resize(widthOrHeight) {

        if (this.opts.orientation === 'horizontal') {
            this.opts.width = widthOrHeight
        } else {
            this.opts.height = widthOrHeight
        }

        this.layout()
    }

    /**
     * 
     * @private
     * @param {*} event 
     */
    onStart(event) {

        this.__dragging = true

        this.capture(event)

        this.__delta = {
            x: this.container.position.x - event.data.global.x,
            y: this.container.position.y - event.data.global.y
        }

        TweenLite.killTweensOf(this.container.position, {x: true, y: true})
        if (typeof ThrowPropsPlugin != "undefined") {
            ThrowPropsPlugin.track(this.container.position, 'x,y')
        }
    }

    /**
     * 
     * @private
     * @param {*} event 
     */
    onMove(event) {

        if (this.__dragging) {
        
            this.capture(event)

            if (this.opts.orientation === 'horizontal') {
                this.container.position.x = event.data.global.x + this.__delta.x
            } else {
                this.container.position.y = event.data.global.y + this.__delta.y
            }
        }
    }

    /**
     * 
     * @private
     * @param {*} event 
     */
    onEnd(event) {

        if (this.__dragging) {
            this.__dragging = false

            this.capture(event)

            const throwProps = {}
            
            if (this.opts.orientation === 'horizontal') {
                let min = this.opts.width - this.innerWidth
                min = min > 0 ? 0 : min
                throwProps.x = {
                    velocity: 'auto',
                    min,
                    max: 0
                }
            } else {
                let min = this.opts.height - this.innerHeight
                min = min > 0 ? 0 : min
                throwProps.y = {
                    velocity: 'auto',
                    min,
                    max: 0
                }
            }

            if (typeof ThrowPropsPlugin != "undefined") {
                ThrowPropsPlugin.to(this.container.position, {
                    throwProps,
                    ease: Strong.easeOut,
                    onComplete: () => ThrowPropsPlugin.untrack(this.container.position)
                }, .8, .4)
            }
        }
    }

    /**
     * 
     * @private
     * @param {*} event 
     */
    onScroll(event) {

        this.capture(event)

        if (this.opts.orientation === 'horizontal') {
            this.container.position.x -= event.deltaX
            if (this.container.position.x > 0) {
                this.container.position.x = 0
            } else if (this.container.position.x + this.innerWidth &lt; this.opts.width) {
                this.container.position.x = this.opts.width - this.innerWidth
            }
        } else {
            this.container.position.y -= event.deltaY
            if (this.container.position.y > 0) {
                this.container.position.y = 0
            } else if (this.container.position.y + this.innerHeight &lt; this.opts.height) {
                this.container.position.y = this.opts.height - this.innerHeight
            }
        }
    }

    /**
     * Captures an event to inform InteractionMapper about processed events.
     *
     * @param {event|PIXI.InteractionEvent} event - The PIXI event to capture.
     */
    capture(event) {
        const originalEvent = event.data &amp;&amp; event.data.originalEvent ? event.data.originalEvent : event
        Events.capturedBy(originalEvent, this)
    }
}
</code></pre>
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