primeng/fesm2022/primeng-scroller.mjs.map

PrimeNG is a premium UI library for Angular featuring a rich set of 90+ components, a theme designer, various theme alternatives such as Material, Bootstrap, Tailwind, premium templates and professional support. In addition, it integrates with PrimeBlock,

{"version":3,"file":"primeng-scroller.mjs","sources":["../../src/scroller/style/scrollerstyle.ts","../../src/scroller/scroller.ts","../../src/scroller/primeng-scroller.ts"],"sourcesContent":["import { Injectable } from '@angular/core';\nimport { BaseStyle } from 'primeng/base';\n\nconst css = /*css*/ `\n.p-virtualscroller {\n    position: relative;\n    overflow: auto;\n    contain: strict;\n    transform: translateZ(0);\n    will-change: scroll-position;\n    outline: 0 none;\n}\n\n.p-virtualscroller-content {\n    position: absolute;\n    top: 0;\n    left: 0;\n    min-height: 100%;\n    min-width: 100%;\n    will-change: transform;\n}\n\n.p-virtualscroller-spacer {\n    position: absolute;\n    top: 0;\n    left: 0;\n    height: 1px;\n    width: 1px;\n    transform-origin: 0 0;\n    pointer-events: none;\n}\n\n.p-virtualscroller-loader {\n    position: sticky;\n    top: 0;\n    left: 0;\n    width: 100%;\n    height: 100%;\n    background: dt('virtualscroller.loader.mask.background');\n    color: dt('virtualscroller.loader.mask.color');\n}\n\n.p-virtualscroller-loader-mask {\n    display: flex;\n    align-items: center;\n    justify-content: center;\n}\n\n.p-virtualscroller-loading-icon {\n    font-size: dt('virtualscroller.loader.icon.size');\n    width: dt('virtualscroller.loader.icon.size');\n    height: dt('virtualscroller.loader.icon.size');\n}\n\n.p-virtualscroller-horizontal > .p-virtualscroller-content {\n    display: flex;\n}\n\n.p-virtualscroller-inline .p-virtualscroller-content {\n    position: static;\n}\n`;\n\nconst classes = {\n    root: ({ instance }) => [\n        'p-virtualscroller',\n        {\n            'p-virtualscroller-inline': instance.inline(),\n            'p-virtualscroller-both p-both-scroll': instance.both(),\n            'p-virtualscroller-horizontal p-horizontal-scroll': instance.horizontal()\n        }\n    ],\n    content: 'p-virtualscroller-content',\n    spacer: 'p-virtualscroller-spacer',\n    loader: ({ instance }) => [\n        'p-virtualscroller-loader',\n        {\n            'p-virtualscroller-loader-mask': !instance.loaderTemplate()\n        }\n    ],\n    loadingIcon: 'p-virtualscroller-loading-icon'\n};\n\n@Injectable()\nexport class ScrollerStyle extends BaseStyle {\n    name = 'virtualscroller';\n\n    css = css;\n\n    classes = classes;\n}\n\n/**\n *\n * VirtualScroller is a performant approach to handle huge data efficiently.\n *\n * [Live Demo](https://www.primeng.org/scroller/)\n *\n * @module scrollerstyle\n *\n */\nexport enum ScrollerClasses {\n    /**\n     * Class name of the root element\n     */\n    root = 'p-virtualscroller',\n    /**\n     * Class name of the content element\n     */\n    content = 'p-virtualscroller-content',\n    /**\n     * Class name of the spacer element\n     */\n    spacer = 'p-virtualscroller-spacer',\n    /**\n     * Class name of the loader element\n     */\n    loader = 'p-virtualscroller-loader',\n    /**\n     * Class name of the loading icon element\n     */\n    loadingIcon = 'p-virtualscroller-loading-icon'\n}\n\nexport interface ScrollerStyle extends BaseStyle {}\n","import { isPlatformBrowser, NgTemplateOutlet } from '@angular/common';\nimport { ChangeDetectionStrategy, Component, computed, contentChild, effect, ElementRef, inject, InjectionToken, input, NgModule, output, signal, TemplateRef, untracked, viewChild, ViewEncapsulation } from '@angular/core';\nimport { findSingle, getHeight, getWidth, isTouchDevice, isVisible } from '@primeuix/utils';\nimport { ScrollerOptions } from 'primeng/api';\nimport { BaseComponent, PARENT_INSTANCE } from 'primeng/basecomponent';\nimport { Bind } from 'primeng/bind';\nimport { Spinner as SpinnerIcon } from '@primeicons/angular/spinner';\nimport { VoidListener } from 'primeng/ts-helpers';\nimport {\n    ScrollerContentTemplateContext,\n    ScrollerItemTemplateContext,\n    ScrollerLazyLoadEvent,\n    ScrollerLoaderIconTemplateContext,\n    ScrollerLoaderTemplateContext,\n    ScrollerScrollEvent,\n    ScrollerScrollIndexChangeEvent,\n    ScrollerToType,\n    VirtualScrollerPassThrough\n} from 'primeng/types/scroller';\nimport { ScrollerStyle } from './style/scrollerstyle';\nimport { CSSProperties } from 'primeng/types/shared';\n\nconst SCROLLER_INSTANCE = new InjectionToken<Scroller>('SCROLLER_INSTANCE');\n\n/**\n * Scroller is a performance-approach to handle huge data efficiently.\n * @group Components\n */\n@Component({\n    selector: 'p-scroller, p-virtualscroller, p-virtual-scroller',\n    imports: [NgTemplateOutlet, SpinnerIcon, Bind],\n    standalone: true,\n    template: `\n        @if (!_disabled()) {\n            <div #element [attr.id]=\"_id()\" [attr.tabindex]=\"_tabindex()\" [style]=\"_style()\" [class]=\"cn(cx('root'), _styleClass())\" (scroll)=\"onContainerScroll($event)\" [pBind]=\"ptm('root')\">\n                @if (contentTemplate()) {\n                    <ng-container *ngTemplateOutlet=\"contentTemplate(); context: getContentTemplateContext()\"></ng-container>\n                } @else {\n                    <div #content [class]=\"cn(cx('content'), contentStyleClass())\" [style]=\"contentStyle\" [pBind]=\"ptm('content')\">\n                        @for (item of loadedItems; track _trackBy() ? _trackBy()($index, item) : $index; let index = $index) {\n                            <ng-container *ngTemplateOutlet=\"itemTemplate(); context: getItemTemplateContext(item, index)\"></ng-container>\n                        }\n                    </div>\n                }\n                @if (_showSpacer()) {\n                    <div [class]=\"cx('spacer')\" [style]=\"spacerStyle\" [pBind]=\"ptm('spacer')\"></div>\n                }\n                @if (!_loaderDisabled() && _showLoader() && d_loading) {\n                    <div [class]=\"cx('loader')\" [pBind]=\"ptm('loader')\">\n                        @if (loaderTemplate()) {\n                            @for (item of loaderArr; track $index; let index = $index) {\n                                <ng-container *ngTemplateOutlet=\"loaderTemplate(); context: getLoaderTemplateContext(index)\"></ng-container>\n                            }\n                        } @else {\n                            @if (loaderIconTemplate()) {\n                                <ng-container *ngTemplateOutlet=\"loaderIconTemplate(); context: loaderIconContext\"></ng-container>\n                            } @else {\n                                <svg data-p-icon=\"spinner\" [class]=\"cx('loadingIcon')\" [spin]=\"true\" [pBind]=\"ptm('loadingIcon')\" />\n                            }\n                        }\n                    </div>\n                }\n            </div>\n        } @else {\n            <ng-content />\n            @if (contentTemplate()) {\n                <ng-container *ngTemplateOutlet=\"contentTemplate(); context: getDisabledContentTemplateContext()\"></ng-container>\n            }\n        }\n    `,\n    changeDetection: ChangeDetectionStrategy.Default,\n    encapsulation: ViewEncapsulation.None,\n    providers: [ScrollerStyle, { provide: SCROLLER_INSTANCE, useExisting: Scroller }, { provide: PARENT_INSTANCE, useExisting: Scroller }],\n    hostDirectives: [Bind],\n    host: {\n        '[style.height]': 'hostHeight()'\n    }\n})\nexport class Scroller extends BaseComponent<VirtualScrollerPassThrough> {\n    componentName = 'VirtualScroller';\n\n    bindDirectiveInstance = inject(Bind, { self: true });\n\n    $pcScroller: Scroller | undefined = inject(SCROLLER_INSTANCE, { optional: true, skipSelf: true }) ?? undefined;\n\n    hostName = input('');\n    /**\n     * Unique identifier of the element.\n     * @group Props\n     */\n    id = input<string | undefined>();\n    /**\n     * Inline style of the component.\n     * @group Props\n     */\n    style = input<any>();\n    /**\n     * Style class of the element.\n     * @group Props\n     */\n    styleClass = input<string | undefined>();\n    /**\n     * Index of the element in tabbing order.\n     * @group Props\n     */\n    tabindex = input(0);\n    /**\n     * An array of objects to display.\n     * @group Props\n     */\n    items = input<any[] | undefined | null>();\n    /**\n     * The height/width of item according to orientation.\n     * @group Props\n     */\n    itemSize = input<number | number[]>(0);\n    /**\n     * Height of the scroll viewport.\n     * @group Props\n     */\n    scrollHeight = input<string | undefined>();\n    /**\n     * Width of the scroll viewport.\n     * @group Props\n     */\n    scrollWidth = input<string | undefined>();\n    /**\n     * The orientation of scrollbar.\n     * @group Props\n     */\n    orientation = input<'vertical' | 'horizontal' | 'both'>('vertical');\n    /**\n     * Used to specify how many items to load in each load method in lazy mode.\n     * @group Props\n     */\n    step = input(0);\n    /**\n     * Delay in scroll before new data is loaded.\n     * @group Props\n     */\n    delay = input(0);\n    /**\n     * Delay after window's resize finishes.\n     * @group Props\n     */\n    resizeDelay = input(10);\n    /**\n     * Used to append each loaded item to top without removing any items from the DOM. Using very large data may cause the browser to crash.\n     * @group Props\n     */\n    appendOnly = input(false);\n    /**\n     * Specifies whether the scroller should be displayed inline or not.\n     * @group Props\n     */\n    inline = input(false);\n    /**\n     * Defines if data is loaded and interacted with in lazy manner.\n     * @group Props\n     */\n    lazy = input(false);\n    /**\n     * If disabled, the scroller feature is eliminated and the content is displayed directly.\n     * @group Props\n     */\n    disabled = input(false);\n    /**\n     * Used to implement a custom loader instead of using the loader feature in the scroller.\n     * @group Props\n     */\n    loaderDisabled = input(false);\n    /**\n     * Columns to display.\n     * @group Props\n     */\n    columns = input<any[] | undefined | null>();\n    /**\n     * Used to implement a custom spacer instead of using the spacer feature in the scroller.\n     * @group Props\n     */\n    showSpacer = input(true);\n    /**\n     * Defines whether to show loader.\n     * @group Props\n     */\n    showLoader = input(false);\n    /**\n     * Determines how many additional elements to add to the DOM outside of the view. According to the scrolls made up and down, extra items are added in a certain algorithm in the form of multiples of this number. Default value is half the number of items shown in the view.\n     * @group Props\n     */\n    numToleratedItems = input<any>();\n    /**\n     * Defines whether the data is loaded.\n     * @group Props\n     */\n    loading = input<boolean | undefined>();\n    /**\n     * Defines whether to dynamically change the height or width of scrollable container.\n     * @group Props\n     */\n    autoSize = input(false);\n    /**\n     * Function to optimize the dom operations by delegating to ngForTrackBy, default algoritm checks for object identity.\n     * @group Props\n     */\n    trackBy = input<Function>();\n    /**\n     * Defines whether to use the scroller feature. The properties of scroller component can be used like an object in it.\n     * @group Props\n     */\n    options = input<ScrollerOptions | undefined>();\n\n    // Computed: Options merge with individual inputs\n    _id = computed(() => this.options()?.id ?? this.id());\n    _style = computed(() => this.options()?.style ?? this.style());\n    _styleClass = computed(() => this.options()?.styleClass ?? this.styleClass());\n    _tabindex = computed(() => this.options()?.tabindex ?? this.tabindex());\n    _items = computed(() => this.options()?.items ?? this.items());\n    _itemSize = computed(() => this.options()?.itemSize ?? this.itemSize());\n    _scrollHeight = computed(() => this.options()?.scrollHeight ?? this.scrollHeight());\n    _scrollWidth = computed(() => this.options()?.scrollWidth ?? this.scrollWidth());\n    _orientation = computed(() => this.options()?.orientation ?? this.orientation());\n    _step = computed(() => this.options()?.step ?? this.step());\n    _delay = computed(() => this.options()?.delay ?? this.delay());\n    _resizeDelay = computed(() => this.options()?.resizeDelay ?? this.resizeDelay());\n    _appendOnly = computed(() => this.options()?.appendOnly ?? this.appendOnly());\n    _inline = computed(() => this.options()?.inline ?? this.inline());\n    _lazy = computed(() => this.options()?.lazy ?? this.lazy());\n    _disabled = computed(() => this.options()?.disabled ?? this.disabled());\n    _loaderDisabled = computed(() => this.options()?.loaderDisabled ?? this.loaderDisabled());\n    _columns = computed(() => this.options()?.columns ?? this.columns());\n    _showSpacer = computed(() => this.options()?.showSpacer ?? this.showSpacer());\n    _showLoader = computed(() => this.options()?.showLoader ?? this.showLoader());\n    _numToleratedItems = computed(() => this.options()?.numToleratedItems ?? this.numToleratedItems());\n    _loading = computed(() => this.options()?.loading ?? this.loading());\n    _autoSize = computed(() => this.options()?.autoSize ?? this.autoSize());\n    _trackBy = computed(() => this.options()?.trackBy ?? this.trackBy());\n\n    contentStyleClass = computed(() => this.options()?.contentStyleClass);\n\n    /**\n     * Callback to invoke in lazy mode to load new data.\n     * @param {ScrollerLazyLoadEvent} event - Custom lazy load event.\n     * @group Emits\n     */\n    onLazyLoad = output<ScrollerLazyLoadEvent>();\n    /**\n     * Callback to invoke when scroll position changes.\n     * @param {ScrollerScrollEvent} event - Custom scroll event.\n     * @group Emits\n     */\n    onScroll = output<ScrollerScrollEvent>();\n    /**\n     * Callback to invoke when scroll position and item's range in view changes.\n     * @param {ScrollerScrollEvent} event - Custom scroll index change event.\n     * @group Emits\n     */\n    onScrollIndexChange = output<ScrollerScrollIndexChangeEvent>();\n\n    elementViewChild = viewChild<ElementRef>('element');\n\n    contentViewChild = viewChild<ElementRef>('content');\n\n    hostHeight = signal<string | undefined>(undefined);\n\n    /**\n     * Content template of the component.\n     * @param {ScrollerContentTemplateContext} context - content context.\n     * @see {@link ScrollerContentTemplateContext}\n     * @group Templates\n     */\n    contentTemplate = contentChild<TemplateRef<ScrollerContentTemplateContext>>('content', { descendants: false });\n\n    /**\n     * Item template of the component.\n     * @param {ScrollerItemTemplateContext} context - item context.\n     * @see {@link ScrollerItemTemplateContext}\n     * @group Templates\n     */\n    itemTemplate = contentChild<TemplateRef<ScrollerItemTemplateContext>>('item', { descendants: false });\n\n    /**\n     * Loader template of the component.\n     * @param {ScrollerLoaderTemplateContext} context - loader context.\n     * @see {@link ScrollerLoaderTemplateContext}\n     * @group Templates\n     */\n    loaderTemplate = contentChild<TemplateRef<ScrollerLoaderTemplateContext>>('loader', { descendants: false });\n\n    /**\n     * Loader icon template of the component.\n     * @param {ScrollerLoaderIconTemplateContext} context - loader icon context.\n     * @see {@link ScrollerLoaderIconTemplateContext}\n     * @group Templates\n     */\n    loaderIconTemplate = contentChild<TemplateRef<ScrollerLoaderIconTemplateContext>>('loadericon', { descendants: false });\n\n    d_loading: boolean = false;\n\n    d_numToleratedItems: any;\n\n    contentEl: any;\n\n    vertical = computed(() => this._orientation() === 'vertical');\n\n    horizontal = computed(() => this._orientation() === 'horizontal');\n\n    both = computed(() => this._orientation() === 'both');\n\n    get loadedItems() {\n        const items = this._items();\n        if (items && !this.d_loading) {\n            if (this.both()) {\n                return items.slice(this._appendOnly() ? 0 : this.first.rows, this.last.rows).map((item) => {\n                    if (this._columns()) {\n                        return item;\n                    } else if (Array.isArray(item)) {\n                        return item.slice(this._appendOnly() ? 0 : this.first.cols, this.last.cols);\n                    } else {\n                        return item;\n                    }\n                });\n            } else if (this.horizontal() && this._columns()) return items;\n            else return items.slice(this._appendOnly() ? 0 : this.first, this.last);\n        }\n\n        return [];\n    }\n\n    get loadedRows() {\n        return this.d_loading ? (this._loaderDisabled() ? this.loaderArr : []) : this.loadedItems;\n    }\n\n    get loadedColumns() {\n        const columns = this._columns();\n        if (columns && (this.both() || this.horizontal())) {\n            return this.d_loading && this._loaderDisabled() ? (this.both() ? this.loaderArr[0] : this.loaderArr) : columns.slice(this.both() ? this.first.cols : this.first, this.both() ? this.last.cols : this.last);\n        }\n\n        return columns;\n    }\n\n    first: any = 0;\n\n    last: any = 0;\n\n    page: number = 0;\n\n    isRangeChanged: boolean = false;\n\n    numItemsInViewport: any = 0;\n\n    lastScrollPos: any = 0;\n\n    lazyLoadState: any = {};\n\n    loaderArr: any[] = [];\n\n    spacerStyle: CSSProperties;\n\n    contentStyle: CSSProperties;\n\n    scrollTimeout: any;\n\n    resizeTimeout: any;\n\n    private _destroyed = false;\n\n    initialized: boolean = false;\n\n    windowResizeListener: VoidListener;\n\n    defaultWidth: number | undefined;\n\n    defaultHeight: number | undefined;\n\n    defaultContentWidth: number | undefined;\n\n    defaultContentHeight: number | undefined;\n\n    _componentStyle = inject(ScrollerStyle);\n\n    constructor() {\n        super();\n\n        // hostHeight\n        effect(() => {\n            if (this._scrollHeight() === '100%') {\n                this.hostHeight.set('100%');\n            }\n        });\n\n        // loading sync\n        effect(() => {\n            const loading = this._loading();\n            untracked(() => {\n                if (this._lazy() && loading !== undefined && loading !== this.d_loading) {\n                    this.d_loading = loading;\n                }\n            });\n        });\n\n        // orientation reset\n        effect(() => {\n            this._orientation();\n            untracked(() => {\n                this.lastScrollPos = this.both() ? { top: 0, left: 0 } : 0;\n            });\n        });\n\n        // numToleratedItems sync\n        effect(() => {\n            const numT = this._numToleratedItems();\n            untracked(() => {\n                if (numT !== undefined && numT !== this.d_numToleratedItems) {\n                    this.d_numToleratedItems = numT;\n                }\n            });\n        });\n\n        // reinit on size/scroll changes\n        effect(() => {\n            this._itemSize();\n            this._scrollHeight();\n            this._scrollWidth();\n            untracked(() => {\n                if (this.initialized) {\n                    this.init();\n                    this.calculateAutoSize();\n                }\n            });\n        });\n\n        // items change\n        effect(() => {\n            this._items();\n            untracked(() => {\n                if (this.initialized && !this._lazy()) {\n                    this.init();\n                }\n            });\n        });\n\n        // contentStyle sync from options\n        effect(() => {\n            const opts = this.options();\n            untracked(() => {\n                if (opts?.contentStyle !== undefined) {\n                    this.contentStyle = opts.contentStyle;\n                }\n            });\n        });\n    }\n\n    onInit() {\n        this.setInitialState();\n    }\n\n    onAfterViewInit() {\n        Promise.resolve().then(() => {\n            this.viewInit();\n        });\n    }\n\n    onAfterViewChecked() {\n        this.bindDirectiveInstance.setAttrs(this.ptm('host'));\n        if (!this.initialized) {\n            this.viewInit();\n        }\n    }\n\n    onDestroy() {\n        this._destroyed = true;\n        this.unbindResizeListener();\n\n        // Cancel pending scroll/resize debounce timers so handleEvents can't emit after destroy.\n        if (this.scrollTimeout) {\n            clearTimeout(this.scrollTimeout);\n        }\n        if (this.resizeTimeout) {\n            clearTimeout(this.resizeTimeout);\n        }\n\n        this.contentEl = null;\n        this.initialized = false;\n    }\n\n    viewInit() {\n        if (isPlatformBrowser(this.platformId) && !this.initialized) {\n            if (isVisible(this.elementViewChild()?.nativeElement)) {\n                this.setInitialState();\n                this.setContentEl(this.contentEl);\n                this.init();\n\n                this.defaultWidth = getWidth(this.elementViewChild()?.nativeElement);\n                this.defaultHeight = getHeight(this.elementViewChild()?.nativeElement);\n                this.defaultContentWidth = getWidth(this.contentEl);\n                this.defaultContentHeight = getHeight(this.contentEl);\n                this.initialized = true;\n            }\n        }\n    }\n\n    init() {\n        if (!this._disabled()) {\n            this.bindResizeListener();\n\n            // wait for the next tick\n            setTimeout(() => {\n                this.setSpacerSize();\n                this.setSize();\n                this.calculateOptions();\n                this.calculateAutoSize();\n                this.cd.detectChanges();\n            }, 1);\n        }\n    }\n\n    setContentEl(el?: HTMLElement) {\n        this.contentEl = el || this.contentViewChild()?.nativeElement || findSingle(this.elementViewChild()?.nativeElement, '.p-virtualscroller-content');\n    }\n    setInitialState() {\n        this.first = this.both() ? { rows: 0, cols: 0 } : 0;\n        this.last = this.both() ? { rows: 0, cols: 0 } : 0;\n        this.numItemsInViewport = this.both() ? { rows: 0, cols: 0 } : 0;\n        this.lastScrollPos = this.both() ? { top: 0, left: 0 } : 0;\n        if (this.d_loading === undefined || this.d_loading === false) {\n            this.d_loading = this._loading() || false;\n        }\n        this.d_numToleratedItems = this._numToleratedItems();\n        this.loaderArr = this.loaderArr.length > 0 ? this.loaderArr : [];\n    }\n\n    getElementRef() {\n        return this.elementViewChild();\n    }\n\n    getPageByFirst(first?: any) {\n        return Math.floor(((first ?? this.first) + this.d_numToleratedItems * 4) / (this._step() || 1));\n    }\n\n    isPageChanged(first?: any) {\n        return this._step() ? this.page !== this.getPageByFirst(first ?? this.first) : true;\n    }\n\n    scrollTo(options: ScrollToOptions) {\n        this.elementViewChild()?.nativeElement?.scrollTo(options);\n    }\n\n    scrollToIndex(index: number | number[], behavior: ScrollBehavior = 'auto') {\n        const valid = this.both() ? (index as number[]).every((i) => i > -1) : (index as number) > -1;\n\n        if (valid) {\n            const first = this.first;\n            const { scrollTop = 0, scrollLeft = 0 } = this.elementViewChild()?.nativeElement;\n            const { numToleratedItems } = this.calculateNumItems();\n            const contentPos = this.getContentPosition();\n            const itemSize = this._itemSize();\n            const calculateFirst = (_index = 0, _numT: number) => (_index <= _numT ? 0 : _index);\n            const calculateCoord = (_first: number, _size: number, _cpos: number) => _first * _size + _cpos;\n            const scrollTo = (left = 0, top = 0) => this.scrollTo({ left, top, behavior });\n            let newFirst = this.both() ? { rows: 0, cols: 0 } : 0;\n            let isRangeChanged = false,\n                isScrollChanged = false;\n\n            if (this.both()) {\n                newFirst = {\n                    rows: calculateFirst(index[0], numToleratedItems[0]),\n                    cols: calculateFirst(index[1], numToleratedItems[1])\n                };\n                scrollTo(calculateCoord(newFirst.cols, itemSize[1], contentPos.left), calculateCoord(newFirst.rows, itemSize[0], contentPos.top));\n                isScrollChanged = this.lastScrollPos.top !== scrollTop || this.lastScrollPos.left !== scrollLeft;\n                isRangeChanged = newFirst.rows !== first.rows || newFirst.cols !== first.cols;\n            } else {\n                newFirst = calculateFirst(index as number, numToleratedItems);\n                this.horizontal() ? scrollTo(calculateCoord(newFirst, itemSize, contentPos.left), scrollTop) : scrollTo(scrollLeft, calculateCoord(newFirst, itemSize, contentPos.top));\n                isScrollChanged = this.lastScrollPos !== (this.horizontal() ? scrollLeft : scrollTop);\n                isRangeChanged = newFirst !== first;\n            }\n\n            this.isRangeChanged = isRangeChanged;\n            isScrollChanged && (this.first = newFirst);\n        }\n    }\n\n    scrollInView(index: number, to: ScrollerToType, behavior: ScrollBehavior = 'auto') {\n        if (to) {\n            const { first, viewport } = this.getRenderedRange();\n            const scrollTo = (left = 0, top = 0) => this.scrollTo({ left, top, behavior });\n            const isToStart = to === 'to-start';\n            const isToEnd = to === 'to-end';\n\n            if (isToStart) {\n                if (this.both()) {\n                    if (viewport.first.rows - first.rows > (<any>index)[0]) {\n                        scrollTo(viewport.first.cols * (<number[]>this._itemSize())[1], (viewport.first.rows - 1) * (<number[]>this._itemSize())[0]);\n                    } else if (viewport.first.cols - first.cols > (<any>index)[1]) {\n                        scrollTo((viewport.first.cols - 1) * (<number[]>this._itemSize())[1], viewport.first.rows * (<number[]>this._itemSize())[0]);\n                    }\n                } else {\n                    if (viewport.first - first > index) {\n                        const pos = (viewport.first - 1) * <number>this._itemSize();\n                        this.horizontal() ? scrollTo(pos, 0) : scrollTo(0, pos);\n                    }\n                }\n            } else if (isToEnd) {\n                if (this.both()) {\n                    if (viewport.last.rows - first.rows <= (<any>index)[0] + 1) {\n                        scrollTo(viewport.first.cols * (<number[]>this._itemSize())[1], (viewport.first.rows + 1) * (<number[]>this._itemSize())[0]);\n                    } else if (viewport.last.cols - first.cols <= (<any>index)[1] + 1) {\n                        scrollTo((viewport.first.cols + 1) * (<number[]>this._itemSize())[1], viewport.first.rows * (<number[]>this._itemSize())[0]);\n                    }\n                } else {\n                    if (viewport.last - first <= index + 1) {\n                        const pos = (viewport.first + 1) * <number>this._itemSize();\n                        this.horizontal() ? scrollTo(pos, 0) : scrollTo(0, pos);\n                    }\n                }\n            }\n        } else {\n            this.scrollToIndex(index, behavior);\n        }\n    }\n\n    getRenderedRange() {\n        const calculateFirstInViewport = (_pos: number, _size: number) => (_size || _pos ? Math.floor(_pos / (_size || _pos)) : 0);\n\n        let firstInViewport = this.first;\n        let lastInViewport: any = 0;\n        const el = this.elementViewChild()?.nativeElement;\n\n        if (el) {\n            const { scrollTop, scrollLeft } = el;\n\n            if (this.both()) {\n                firstInViewport = {\n                    rows: calculateFirstInViewport(scrollTop, (<number[]>this._itemSize())[0]),\n                    cols: calculateFirstInViewport(scrollLeft, (<number[]>this._itemSize())[1])\n                };\n                lastInViewport = {\n                    rows: firstInViewport.rows + this.numItemsInViewport.rows,\n                    cols: firstInViewport.cols + this.numItemsInViewport.cols\n                };\n            } else {\n                const scrollPos = this.horizontal() ? scrollLeft : scrollTop;\n                firstInViewport = calculateFirstInViewport(scrollPos, <number>this._itemSize());\n                lastInViewport = firstInViewport + this.numItemsInViewport;\n            }\n        }\n\n        return {\n            first: this.first,\n            last: this.last,\n            viewport: {\n                first: firstInViewport,\n                last: lastInViewport\n            }\n        };\n    }\n\n    calculateNumItems() {\n        const contentPos = this.getContentPosition();\n        const el = this.elementViewChild()?.nativeElement;\n        const contentWidth = (el ? el.offsetWidth - contentPos.left : 0) || 0;\n        const contentHeight = (el ? el.offsetHeight - contentPos.top : 0) || 0;\n        const calculateNumItemsInViewport = (_contentSize: number, _itemSize: number) => (_itemSize || _contentSize ? Math.ceil(_contentSize / (_itemSize || _contentSize)) : 0);\n        const calculateNumToleratedItems = (_numItems: number) => Math.ceil(_numItems / 2);\n        const numItemsInViewport: any = this.both()\n            ? {\n                  rows: calculateNumItemsInViewport(contentHeight, (<number[]>this._itemSize())[0]),\n                  cols: calculateNumItemsInViewport(contentWidth, (<number[]>this._itemSize())[1])\n              }\n            : calculateNumItemsInViewport(this.horizontal() ? contentWidth : contentHeight, <number>this._itemSize());\n\n        const numToleratedItems = this.d_numToleratedItems || (this.both() ? [calculateNumToleratedItems(numItemsInViewport.rows), calculateNumToleratedItems(numItemsInViewport.cols)] : calculateNumToleratedItems(numItemsInViewport));\n\n        return { numItemsInViewport, numToleratedItems };\n    }\n\n    calculateOptions() {\n        const { numItemsInViewport, numToleratedItems } = this.calculateNumItems();\n        const calculateLast = (_first: number, _num: number, _numT: number, _isCols: boolean = false) => this.getLast(_first + _num + (_first < _numT ? 2 : 3) * _numT, _isCols);\n        const first = this.first;\n        const last = this.both()\n            ? {\n                  rows: calculateLast(this.first.rows, numItemsInViewport.rows, numToleratedItems[0]),\n                  cols: calculateLast(this.first.cols, numItemsInViewport.cols, numToleratedItems[1], true)\n              }\n            : calculateLast(this.first, numItemsInViewport, numToleratedItems);\n\n        this.last = last;\n        this.numItemsInViewport = numItemsInViewport;\n        this.d_numToleratedItems = numToleratedItems;\n\n        if (this._showLoader()) {\n            this.loaderArr = this.both() ? Array.from({ length: numItemsInViewport.rows }).map(() => Array.from({ length: numItemsInViewport.cols })) : Array.from({ length: numItemsInViewport });\n        }\n\n        if (this._lazy()) {\n            Promise.resolve().then(() => {\n                this.lazyLoadState = {\n                    first: this._step() ? (this.both() ? { rows: 0, cols: first.cols } : 0) : first,\n                    last: Math.min(this._step() ? this._step() : this.last, (<any[]>this._items()).length)\n                };\n\n                this.handleEvents('onLazyLoad', this.lazyLoadState);\n            });\n        }\n    }\n\n    calculateAutoSize() {\n        if (this._autoSize() && !this.d_loading) {\n            Promise.resolve().then(() => {\n                if (this.contentEl) {\n                    this.contentEl.style.minHeight = this.contentEl.style.minWidth = 'auto';\n                    this.contentEl.style.position = 'relative';\n                    (<ElementRef>this.elementViewChild()).nativeElement.style.contain = 'none';\n\n                    const [contentWidth, contentHeight] = [getWidth(this.contentEl), getHeight(this.contentEl)];\n                    contentWidth !== this.defaultContentWidth && ((<ElementRef>this.elementViewChild()).nativeElement.style.width = '');\n                    contentHeight !== this.defaultContentHeight && ((<ElementRef>this.elementViewChild()).nativeElement.style.height = '');\n\n                    const [width, height] = [getWidth((<ElementRef>this.elementViewChild()).nativeElement), getHeight((<ElementRef>this.elementViewChild()).nativeElement)];\n                    (this.both() || this.horizontal()) && ((<ElementRef>this.elementViewChild()).nativeElement.style.width = width < <number>this.defaultWidth ? width + 'px' : this._scrollWidth() || this.defaultWidth + 'px');\n                    (this.both() || this.vertical()) && ((<ElementRef>this.elementViewChild()).nativeElement.style.height = height < <number>this.defaultHeight ? height + 'px' : this._scrollHeight() || this.defaultHeight + 'px');\n\n                    this.contentEl.style.minHeight = this.contentEl.style.minWidth = '';\n                    this.contentEl.style.position = '';\n                    (<ElementRef>this.elementViewChild()).nativeElement.style.contain = '';\n                }\n            });\n        }\n    }\n\n    getLast(last = 0, isCols = false) {\n        const items = this._items();\n        const columns = this._columns();\n        return items ? Math.min(isCols ? (columns || items[0]).length : items.length, last) : 0;\n    }\n\n    getContentPosition() {\n        if (this.contentEl) {\n            const style = getComputedStyle(this.contentEl);\n            const left = parseFloat(style.paddingLeft) + Math.max(parseFloat(style.left) || 0, 0);\n            const right = parseFloat(style.paddingRight) + Math.max(parseFloat(style.right) || 0, 0);\n            const top = parseFloat(style.paddingTop) + Math.max(parseFloat(style.top) || 0, 0);\n            const bottom = parseFloat(style.paddingBottom) + Math.max(parseFloat(style.bottom) || 0, 0);\n\n            return { left, right, top, bottom, x: left + right, y: top + bottom };\n        }\n\n        return { left: 0, right: 0, top: 0, bottom: 0, x: 0, y: 0 };\n    }\n\n    setSize() {\n        const nativeElement = this.elementViewChild()?.nativeElement;\n        if (nativeElement) {\n            const parentElement = nativeElement.parentElement?.parentElement;\n\n            const elementWidth = nativeElement.offsetWidth;\n            const parentWidth = parentElement?.offsetWidth || 0;\n            const width = this._scrollWidth() || `${elementWidth || parentWidth}px`;\n\n            const elementHeight = nativeElement.offsetHeight;\n            const parentHeight = parentElement?.offsetHeight || 0;\n            const height = this._scrollHeight() || `${elementHeight || parentHeight}px`;\n\n            const setProp = (_name: string, _value: any) => (nativeElement.style[_name] = _value);\n\n            if (this.both() || this.horizontal()) {\n                setProp('height', height);\n                setProp('width', width);\n            } else {\n                setProp('height', height);\n            }\n        }\n    }\n\n    setSpacerSize() {\n        const items = this._items();\n        if (items) {\n            const contentPos = this.getContentPosition();\n            const setProp = (_name: string, _value: any, _size: number, _cpos: number = 0) =>\n                (this.spacerStyle = {\n                    ...this.spacerStyle,\n                    ...{ [`${_name}`]: (_value || []).length * _size + _cpos + 'px' }\n                });\n\n            if (this.both()) {\n                setProp('height', items, (<number[]>this._itemSize())[0], contentPos.y);\n                setProp('width', this._columns() || items[1], (<number[]>this._itemSize())[1], contentPos.x);\n            } else {\n                this.horizontal() ? setProp('width', this._columns() || items, <number>this._itemSize(), contentPos.x) : setProp('height', items, <number>this._itemSize(), contentPos.y);\n            }\n        }\n    }\n\n    setContentPosition(pos: any) {\n        if (this.contentEl && !this._appendOnly()) {\n            const first = pos ? pos.first : this.first;\n            const calculateTranslateVal = (_first: number, _size: number) => _first * _size;\n            const setTransform = (_x = 0, _y = 0) => (this.contentStyle = { ...this.contentStyle, ...{ transform: `translate3d(${_x}px, ${_y}px, 0)` } });\n\n            if (this.both()) {\n                setTransform(calculateTranslateVal(first.cols, (<number[]>this._itemSize())[1]), calculateTranslateVal(first.rows, (<number[]>this._itemSize())[0]));\n            } else {\n                const translateVal = calculateTranslateVal(first, <number>this._itemSize());\n                this.horizontal() ? setTransform(translateVal, 0) : setTransform(0, translateVal);\n            }\n        }\n    }\n\n    onScrollPositionChange(event: Event) {\n        const target = event.target;\n        if (!target) {\n            throw new Error('Event target is null');\n        }\n        const contentPos = this.getContentPosition();\n        const calculateScrollPos = (_pos: number, _cpos: number) => (_pos ? (_pos > _cpos ? _pos - _cpos : _pos) : 0);\n        const calculateCurrentIndex = (_pos: number, _size: number) => (_size || _pos ? Math.floor(_pos / (_size || _pos)) : 0);\n        const calculateTriggerIndex = (_currentIndex: number, _first: number, _last: number, _num: number, _numT: number, _isScrollDownOrRight: any) => {\n            return _currentIndex <= _numT ? _numT : _isScrollDownOrRight ? _last - _num - _numT : _first + _numT - 1;\n        };\n        const calculateFirst = (_currentIndex: number, _triggerIndex: number, _first: number, _last: number, _num: number, _numT: number, _isScrollDownOrRight: any) => {\n            if (_currentIndex <= _numT) return 0;\n            else return Math.max(0, _isScrollDownOrRight ? (_currentIndex < _triggerIndex ? _first : _currentIndex - _numT) : _currentIndex > _triggerIndex ? _first : _currentIndex - 2 * _numT);\n        };\n        const calculateLast = (_currentIndex: number, _first: number, _last: number, _num: number, _numT: number, _isCols = false) => {\n            let lastValue = _first + _num + 2 * _numT;\n\n            if (_currentIndex >= _numT) {\n                lastValue += _numT + 1;\n            }\n\n            return this.getLast(lastValue, _isCols);\n        };\n\n        const scrollTop = calculateScrollPos((<HTMLElement>target).scrollTop, contentPos.top);\n        const scrollLeft = calculateScrollPos((<HTMLElement>target).scrollLeft, contentPos.left);\n\n        let newFirst = this.both() ? { rows: 0, cols: 0 } : 0;\n        let newLast = this.last;\n        let isRangeChanged = false;\n        let newScrollPos = this.lastScrollPos;\n\n        if (this.both()) {\n            const isScrollDown = this.lastScrollPos.top <= scrollTop;\n            const isScrollRight = this.lastScrollPos.left <= scrollLeft;\n\n            if (!this._appendOnly() || (this._appendOnly() && (isScrollDown || isScrollRight))) {\n                const currentIndex = {\n                    rows: calculateCurrentIndex(scrollTop, (<number[]>this._itemSize())[0]),\n                    cols: calculateCurrentIndex(scrollLeft, (<number[]>this._itemSize())[1])\n                };\n                const triggerIndex = {\n                    rows: calculateTriggerIndex(currentIndex.rows, this.first.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0], isScrollDown),\n                    cols: calculateTriggerIndex(currentIndex.cols, this.first.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], isScrollRight)\n                };\n\n                newFirst = {\n                    rows: calculateFirst(currentIndex.rows, triggerIndex.rows, this.first.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0], isScrollDown),\n                    cols: calculateFirst(currentIndex.cols, triggerIndex.cols, this.first.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], isScrollRight)\n                };\n                newLast = {\n                    rows: calculateLast(currentIndex.rows, newFirst.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0]),\n                    cols: calculateLast(currentIndex.cols, newFirst.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], true)\n                };\n\n                isRangeChanged = newFirst.rows !== this.first.rows || newLast.rows !== this.last.rows || newFirst.cols !== this.first.cols || newLast.cols !== this.last.cols || this.isRangeChanged;\n                newScrollPos = { top: scrollTop, left: scrollLeft };\n            }\n        } else {\n            const scrollPos = this.horizontal() ? scrollLeft : scrollTop;\n            const isScrollDownOrRight = this.lastScrollPos <= scrollPos;\n\n            if (!this._appendOnly() || (this._appendOnly() && isScrollDownOrRight)) {\n                const currentIndex = calculateCurrentIndex(scrollPos, <number>this._itemSize());\n                const triggerIndex = calculateTriggerIndex(currentIndex, this.first, this.last, this.numItemsInViewport, this.d_numToleratedItems, isScrollDownOrRight);\n\n                newFirst = calculateFirst(currentIndex, triggerIndex, this.first, this.last, this.numItemsInViewport, this.d_numToleratedItems, isScrollDownOrRight);\n                newLast = calculateLast(currentIndex, newFirst, this.last, this.numItemsInViewport, this.d_numToleratedItems);\n                isRangeChanged = newFirst !== this.first || newLast !== this.last || this.isRangeChanged;\n                newScrollPos = scrollPos;\n            }\n        }\n\n        return {\n            first: newFirst,\n            last: newLast,\n            isRangeChanged,\n            scrollPos: newScrollPos\n        };\n    }\n\n    onScrollChange(event: Event) {\n        const { first, last, isRangeChanged, scrollPos } = this.onScrollPositionChange(event);\n\n        if (isRangeChanged) {\n            const newState = { first, last };\n\n            this.setContentPosition(newState);\n\n            this.first = first;\n            this.last = last;\n            this.lastScrollPos = scrollPos;\n\n            this.handleEvents('onScrollIndexChange', newState);\n\n            if (this._lazy() && this.isPageChanged(first)) {\n                const lazyLoadState = {\n                    first: this._step() ? Math.min(this.getPageByFirst(first) * this._step(), (<any[]>this._items()).length - this._step()) : first,\n                    last: Math.min(this._step() ? (this.getPageByFirst(first) + 1) * this._step() : last, (<any[]>this._items()).length)\n                };\n                const isLazyStateChanged = this.lazyLoadState.first !== lazyLoadState.first || this.lazyLoadState.last !== lazyLoadState.last;\n\n                isLazyStateChanged && this.handleEvents('onLazyLoad', lazyLoadState);\n                this.lazyLoadState = lazyLoadState;\n            }\n        }\n    }\n\n    onContainerScroll(event: Event) {\n        this.handleEvents('onScroll', { originalEvent: event });\n\n        if (this._delay()) {\n            if (this.scrollTimeout) {\n                clearTimeout(this.scrollTimeout);\n            }\n\n            if (!this.d_loading && this._showLoader()) {\n                const { isRangeChanged } = this.onScrollPositionChange(event);\n                const changed = isRangeChanged || (this._step() ? this.isPageChanged() : false);\n\n                if (changed) {\n                    this.d_loading = true;\n\n                    this.cd.detectChanges();\n                }\n            }\n\n            this.scrollTimeout = setTimeout(() => {\n                this.onScrollChange(event);\n\n                if (this.d_loading && this._showLoader() && (!this._lazy() || this._loading() === undefined)) {\n                    this.d_loading = false;\n                    this.page = this.getPageByFirst();\n                }\n                this.cd.detectChanges();\n            }, this._delay());\n        } else {\n            !this.d_loading && this.onScrollChange(event);\n        }\n    }\n\n    bindResizeListener() {\n        if (isPlatformBrowser(this.platformId)) {\n            if (!this.windowResizeListener) {\n                const window = this.document.defaultView as Window;\n                const event = isTouchDevice() ? 'orientationchange' : 'resize';\n                this.windowResizeListener = this.renderer.listen(window, event, this.onWindowResize.bind(this));\n            }\n        }\n    }\n\n    unbindResizeListener() {\n        if (this.windowResizeListener) {\n            this.windowResizeListener();\n            this.windowResizeListener = null;\n        }\n    }\n\n    onWindowResize() {\n        if (this.resizeTimeout) {\n            clearTimeout(this.resizeTimeout);\n        }\n\n        this.resizeTimeout = setTimeout(() => {\n            if (isVisible(this.elementViewChild()?.nativeElement)) {\n                const [width, height] = [getWidth(this.elementViewChild()?.nativeElement), getHeight(this.elementViewChild()?.nativeElement)];\n                const [isDiffWidth, isDiffHeight] = [width !== this.defaultWidth, height !== this.defaultHeight];\n                const reinit = this.both() ? isDiffWidth || isDiffHeight : this.horizontal() ? isDiffWidth : this.vertical() ? isDiffHeight : false;\n\n                if (reinit) {\n                    this.d_numToleratedItems = this._numToleratedItems();\n                    this.defaultWidth = width;\n                    this.defaultHeight = height;\n                    this.defaultContentWidth = getWidth(this.contentEl);\n                    this.defaultContentHeight = getHeight(this.contentEl);\n\n                    this.init();\n                }\n            }\n        }, this._resizeDelay());\n    }\n\n    handleEvents(name: string, params: any) {\n        // Pending timers / promise microtasks (e.g. the lazy-load Promise.resolve callback) can\n        // reach this after destroy; bail so we don't emit on a destroyed OutputRef.\n        if (this._destroyed) return;\n        const opts = this.options();\n        return opts && (opts as any)[name] ? (opts as any)[name](params) : this[name].emit(params);\n    }\n\n    readonly loaderIconContext = { options: { styleClass: 'p-virtualscroller-loading-icon' } };\n\n    getContentTemplateContext() {\n        return {\n            $implicit: this.loadedItems,\n            options: this.getContentOptions()\n        };\n    }\n\n    getItemTemplateContext(item: any, index: number) {\n        return {\n            $implicit: item,\n            options: this.getOptions(index)\n        };\n    }\n\n    getLoaderTemplateContext(index: number) {\n        return {\n            options: this.getLoaderOptions(index, this.both() && { numCols: this.numItemsInViewport.cols })\n        };\n    }\n\n    getDisabledContentTemplateContext() {\n        return {\n            $implicit: this.items(),\n            options: { rows: this._items(), columns: this.loadedColumns }\n        };\n    }\n\n    getContentOptions() {\n        return {\n            contentStyleClass: `p-virtualscroller-content ${this.d_loading ? 'p-virtualscroller-loading' : ''}`,\n            items: this.loadedItems,\n            getItemOptions: (index: number) => this.getOptions(index),\n            loading: this.d_loading,\n            getLoaderOptions: (index: number, options?: any) => this.getLoaderOptions(index, options),\n            itemSize: this._itemSize(),\n            rows: this.loadedRows,\n            columns: this.loadedColumns,\n            spacerStyle: this.spacerStyle,\n            contentStyle: this.contentStyle,\n            vertical: this.vertical(),\n            horizontal: this.horizontal(),\n            both: this.both(),\n            scrollTo: this.scrollTo.bind(this),\n            scrollToIndex: this.scrollToIndex.bind(this),\n            orientation: this._orientation(),\n            scrollableElement: this.elementViewChild()?.nativeElement\n        };\n    }\n\n    getOptions(renderedIndex: number) {\n        const count = (this._items() || []).length;\n        const index = this.both() ? this.first.rows + renderedIndex : this.first + renderedIndex;\n\n        return {\n            index,\n            count,\n            first: index === 0,\n            last: index === count - 1,\n            even: index % 2 === 0,\n            odd: index % 2 !== 0\n        };\n    }\n\n    getLoaderOptions(index: number, extOptions: any) {\n        const count = this.loaderArr.length;\n\n        return {\n            index,\n            count,\n            first: index === 0,\n            last: index === count - 1,\n            even: index % 2 === 0,\n            odd: index % 2 !== 0,\n            loading: this.d_loading,\n            ...extOptions\n        };\n    }\n}\n\n@NgModule({\n    imports: [Scroller],\n    exports: [Scroller]\n})\nexport class ScrollerModule {}\n","/**\n * Generated bundle index. 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