/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Directionality } from '@angular/cdk/bidi';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ElementRef, inject, Inject, Input, NgZone, Optional, Output, ViewChild, ViewEncapsulation, } from '@angular/core';
import { Platform } from '@angular/cdk/platform';
import { animationFrameScheduler, asapScheduler, Observable, Subject, Subscription, } from 'rxjs';
import { auditTime, startWith, takeUntil } from 'rxjs/operators';
import { ScrollDispatcher } from './scroll-dispatcher';
import { CdkScrollable } from './scrollable';
import { VIRTUAL_SCROLL_STRATEGY } from './virtual-scroll-strategy';
import { ViewportRuler } from './viewport-ruler';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { CdkVirtualScrollable, VIRTUAL_SCROLLABLE } from './virtual-scrollable';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/bidi";
import * as i2 from "./scroll-dispatcher";
import * as i3 from "./viewport-ruler";
import * as i4 from "./virtual-scrollable";
/** Checks if the given ranges are equal. */
function rangesEqual(r1, r2) {
    return r1.start == r2.start && r1.end == r2.end;
}
/**
 * Scheduler to be used for scroll events. Needs to fall back to
 * something that doesn't rely on requestAnimationFrame on environments
 * that don't support it (e.g. server-side rendering).
 */
const SCROLL_SCHEDULER = typeof requestAnimationFrame !== 'undefined' ? animationFrameScheduler : asapScheduler;
/** A viewport that virtualizes its scrolling with the help of `CdkVirtualForOf`. */
export class CdkVirtualScrollViewport extends CdkVirtualScrollable {
    /** The direction the viewport scrolls. */
    get orientation() {
        return this._orientation;
    }
    set orientation(orientation) {
        if (this._orientation !== orientation) {
            this._orientation = orientation;
            this._calculateSpacerSize();
        }
    }
    /**
     * Whether rendered items should persist in the DOM after scrolling out of view. By default, items
     * will be removed.
     */
    get appendOnly() {
        return this._appendOnly;
    }
    set appendOnly(value) {
        this._appendOnly = coerceBooleanProperty(value);
    }
    constructor(elementRef, _changeDetectorRef, ngZone, _scrollStrategy, dir, scrollDispatcher, viewportRuler, scrollable) {
        super(elementRef, scrollDispatcher, ngZone, dir);
        this.elementRef = elementRef;
        this._changeDetectorRef = _changeDetectorRef;
        this._scrollStrategy = _scrollStrategy;
        this.scrollable = scrollable;
        this._platform = inject(Platform);
        /** Emits when the viewport is detached from a CdkVirtualForOf. */
        this._detachedSubject = new Subject();
        /** Emits when the rendered range changes. */
        this._renderedRangeSubject = new Subject();
        this._orientation = 'vertical';
        this._appendOnly = false;
        // Note: we don't use the typical EventEmitter here because we need to subscribe to the scroll
        // strategy lazily (i.e. only if the user is actually listening to the events). We do this because
        // depending on how the strategy calculates the scrolled index, it may come at a cost to
        // performance.
        /** Emits when the index of the first element visible in the viewport changes. */
        this.scrolledIndexChange = new Observable((observer) => this._scrollStrategy.scrolledIndexChange.subscribe(index => Promise.resolve().then(() => this.ngZone.run(() => observer.next(index)))));
        /** A stream that emits whenever the rendered range changes. */
        this.renderedRangeStream = this._renderedRangeSubject;
        /**
         * The total size of all content (in pixels), including content that is not currently rendered.
         */
        this._totalContentSize = 0;
        /** A string representing the `style.width` property value to be used for the spacer element. */
        this._totalContentWidth = '';
        /** A string representing the `style.height` property value to be used for the spacer element. */
        this._totalContentHeight = '';
        /** The currently rendered range of indices. */
        this._renderedRange = { start: 0, end: 0 };
        /** The length of the data bound to this viewport (in number of items). */
        this._dataLength = 0;
        /** The size of the viewport (in pixels). */
        this._viewportSize = 0;
        /** The last rendered content offset that was set. */
        this._renderedContentOffset = 0;
        /**
         * Whether the last rendered content offset was to the end of the content (and therefore needs to
         * be rewritten as an offset to the start of the content).
         */
        this._renderedContentOffsetNeedsRewrite = false;
        /** Whether there is a pending change detection cycle. */
        this._isChangeDetectionPending = false;
        /** A list of functions to run after the next change detection cycle. */
        this._runAfterChangeDetection = [];
        /** Subscription to changes in the viewport size. */
        this._viewportChanges = Subscription.EMPTY;
        if (!_scrollStrategy && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw Error('Error: cdk-virtual-scroll-viewport requires the "itemSize" property to be set.');
        }
        this._viewportChanges = viewportRuler.change().subscribe(() => {
            this.checkViewportSize();
        });
        if (!this.scrollable) {
            // No scrollable is provided, so the virtual-scroll-viewport needs to become a scrollable
            this.elementRef.nativeElement.classList.add('cdk-virtual-scrollable');
            this.scrollable = this;
        }
    }
    ngOnInit() {
        // Scrolling depends on the element dimensions which we can't get during SSR.
        if (!this._platform.isBrowser) {
            return;
        }
        if (this.scrollable === this) {
            super.ngOnInit();
        }
        // It's still too early to measure the viewport at this point. Deferring with a promise allows
        // the Viewport to be rendered with the correct size before we measure. We run this outside the
        // zone to avoid causing more change detection cycles. We handle the change detection loop
        // ourselves instead.
        this.ngZone.runOutsideAngular(() => Promise.resolve().then(() => {
            this._measureViewportSize();
            this._scrollStrategy.attach(this);
            this.scrollable
                .elementScrolled()
                .pipe(
            // Start off with a fake scroll event so we properly detect our initial position.
            startWith(null), 
            // Collect multiple events into one until the next animation frame. This way if
            // there are multiple scroll events in the same frame we only need to recheck
            // our layout once.
            auditTime(0, SCROLL_SCHEDULER), 
            // Usually `elementScrolled` is completed when the scrollable is destroyed, but
            // that may not be the case if a `CdkVirtualScrollableElement` is used so we have
            // to unsubscribe here just in case.
            takeUntil(this._destroyed))
                .subscribe(() => this._scrollStrategy.onContentScrolled());
            this._markChangeDetectionNeeded();
        }));
    }
    ngOnDestroy() {
        this.detach();
        this._scrollStrategy.detach();
        // Complete all subjects
        this._renderedRangeSubject.complete();
        this._detachedSubject.complete();
        this._viewportChanges.unsubscribe();
        super.ngOnDestroy();
    }
    /** Attaches a `CdkVirtualScrollRepeater` to this viewport. */
    attach(forOf) {
        if (this._forOf && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw Error('CdkVirtualScrollViewport is already attached.');
        }
        // Subscribe to the data stream of the CdkVirtualForOf to keep track of when the data length
        // changes. Run outside the zone to avoid triggering change detection, since we're managing the
        // change detection loop ourselves.
        this.ngZone.runOutsideAngular(() => {
            this._forOf = forOf;
            this._forOf.dataStream.pipe(takeUntil(this._detachedSubject)).subscribe(data => {
                const newLength = data.length;
                if (newLength !== this._dataLength) {
                    this._dataLength = newLength;
                    this._scrollStrategy.onDataLengthChanged();
                }
                this._doChangeDetection();
            });
        });
    }
    /** Detaches the current `CdkVirtualForOf`. */
    detach() {
        this._forOf = null;
        this._detachedSubject.next();
    }
    /** Gets the length of the data bound to this viewport (in number of items). */
    getDataLength() {
        return this._dataLength;
    }
    /** Gets the size of the viewport (in pixels). */
    getViewportSize() {
        return this._viewportSize;
    }
    // TODO(mmalerba): This is technically out of sync with what's really rendered until a render
    // cycle happens. I'm being careful to only call it after the render cycle is complete and before
    // setting it to something else, but its error prone and should probably be split into
    // `pendingRange` and `renderedRange`, the latter reflecting whats actually in the DOM.
    /** Get the current rendered range of items. */
    getRenderedRange() {
        return this._renderedRange;
    }
    measureBoundingClientRectWithScrollOffset(from) {
        return this.getElementRef().nativeElement.getBoundingClientRect()[from];
    }
    /**
     * Sets the total size of all content (in pixels), including content that is not currently
     * rendered.
     */
    setTotalContentSize(size) {
        if (this._totalContentSize !== size) {
            this._totalContentSize = size;
            this._calculateSpacerSize();
            this._markChangeDetectionNeeded();
        }
    }
    /** Sets the currently rendered range of indices. */
    setRenderedRange(range) {
        if (!rangesEqual(this._renderedRange, range)) {
            if (this.appendOnly) {
                range = { start: 0, end: Math.max(this._renderedRange.end, range.end) };
            }
            this._renderedRangeSubject.next((this._renderedRange = range));
            this._markChangeDetectionNeeded(() => this._scrollStrategy.onContentRendered());
        }
    }
    /**
     * Gets the offset from the start of the viewport to the start of the rendered data (in pixels).
     */
    getOffsetToRenderedContentStart() {
        return this._renderedContentOffsetNeedsRewrite ? null : this._renderedContentOffset;
    }
    /**
     * Sets the offset from the start of the viewport to either the start or end of the rendered data
     * (in pixels).
     */
    setRenderedContentOffset(offset, to = 'to-start') {
        // In appendOnly, we always start from the top
        offset = this.appendOnly && to === 'to-start' ? 0 : offset;
        // For a horizontal viewport in a right-to-left language we need to translate along the x-axis
        // in the negative direction.
        const isRtl = this.dir && this.dir.value == 'rtl';
        const isHorizontal = this.orientation == 'horizontal';
        const axis = isHorizontal ? 'X' : 'Y';
        const axisDirection = isHorizontal && isRtl ? -1 : 1;
        let transform = `translate${axis}(${Number(axisDirection * offset)}px)`;
        this._renderedContentOffset = offset;
        if (to === 'to-end') {
            transform += ` translate${axis}(-100%)`;
            // The viewport should rewrite this as a `to-start` offset on the next render cycle. Otherwise
            // elements will appear to expand in the wrong direction (e.g. `mat-expansion-panel` would
            // expand upward).
            this._renderedContentOffsetNeedsRewrite = true;
        }
        if (this._renderedContentTransform != transform) {
            // We know this value is safe because we parse `offset` with `Number()` before passing it
            // into the string.
            this._renderedContentTransform = transform;
            this._markChangeDetectionNeeded(() => {
                if (this._renderedContentOffsetNeedsRewrite) {
                    this._renderedContentOffset -= this.measureRenderedContentSize();
                    this._renderedContentOffsetNeedsRewrite = false;
                    this.setRenderedContentOffset(this._renderedContentOffset);
                }
                else {
                    this._scrollStrategy.onRenderedOffsetChanged();
                }
            });
        }
    }
    /**
     * Scrolls to the given offset from the start of the viewport. Please note that this is not always
     * the same as setting `scrollTop` or `scrollLeft`. In a horizontal viewport with right-to-left
     * direction, this would be the equivalent of setting a fictional `scrollRight` property.
     * @param offset The offset to scroll to.
     * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`.
     */
    scrollToOffset(offset, behavior = 'auto') {
        const options = { behavior };
        if (this.orientation === 'horizontal') {
            options.start = offset;
        }
        else {
            options.top = offset;
        }
        this.scrollable.scrollTo(options);
    }
    /**
     * Scrolls to the offset for the given index.
     * @param index The index of the element to scroll to.
     * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`.
     */
    scrollToIndex(index, behavior = 'auto') {
        this._scrollStrategy.scrollToIndex(index, behavior);
    }
    /**
     * Gets the current scroll offset from the start of the scrollable (in pixels).
     * @param from The edge to measure the offset from. Defaults to 'top' in vertical mode and 'start'
     *     in horizontal mode.
     */
    measureScrollOffset(from) {
        // This is to break the call cycle
        let measureScrollOffset;
        if (this.scrollable == this) {
            measureScrollOffset = (_from) => super.measureScrollOffset(_from);
        }
        else {
            measureScrollOffset = (_from) => this.scrollable.measureScrollOffset(_from);
        }
        return Math.max(0, measureScrollOffset(from ?? (this.orientation === 'horizontal' ? 'start' : 'top')) -
            this.measureViewportOffset());
    }
    /**
     * Measures the offset of the viewport from the scrolling container
     * @param from The edge to measure from.
     */
    measureViewportOffset(from) {
        let fromRect;
        const LEFT = 'left';
        const RIGHT = 'right';
        const isRtl = this.dir?.value == 'rtl';
        if (from == 'start') {
            fromRect = isRtl ? RIGHT : LEFT;
        }
        else if (from == 'end') {
            fromRect = isRtl ? LEFT : RIGHT;
        }
        else if (from) {
            fromRect = from;
        }
        else {
            fromRect = this.orientation === 'horizontal' ? 'left' : 'top';
        }
        const scrollerClientRect = this.scrollable.measureBoundingClientRectWithScrollOffset(fromRect);
        const viewportClientRect = this.elementRef.nativeElement.getBoundingClientRect()[fromRect];
        return viewportClientRect - scrollerClientRect;
    }
    /** Measure the combined size of all of the rendered items. */
    measureRenderedContentSize() {
        const contentEl = this._contentWrapper.nativeElement;
        return this.orientation === 'horizontal' ? contentEl.offsetWidth : contentEl.offsetHeight;
    }
    /**
     * Measure the total combined size of the given range. Throws if the range includes items that are
     * not rendered.
     */
    measureRangeSize(range) {
        if (!this._forOf) {
            return 0;
        }
        return this._forOf.measureRangeSize(range, this.orientation);
    }
    /** Update the viewport dimensions and re-render. */
    checkViewportSize() {
        // TODO: Cleanup later when add logic for handling content resize
        this._measureViewportSize();
        this._scrollStrategy.onDataLengthChanged();
    }
    /** Measure the viewport size. */
    _measureViewportSize() {
        this._viewportSize = this.scrollable.measureViewportSize(this.orientation);
    }
    /** Queue up change detection to run. */
    _markChangeDetectionNeeded(runAfter) {
        if (runAfter) {
            this._runAfterChangeDetection.push(runAfter);
        }
        // Use a Promise to batch together calls to `_doChangeDetection`. This way if we set a bunch of
        // properties sequentially we only have to run `_doChangeDetection` once at the end.
        if (!this._isChangeDetectionPending) {
            this._isChangeDetectionPending = true;
            this.ngZone.runOutsideAngular(() => Promise.resolve().then(() => {
                this._doChangeDetection();
            }));
        }
    }
    /** Run change detection. */
    _doChangeDetection() {
        this._isChangeDetectionPending = false;
        // Apply the content transform. The transform can't be set via an Angular binding because
        // bypassSecurityTrustStyle is banned in Google. However the value is safe, it's composed of
        // string literals, a variable that can only be 'X' or 'Y', and user input that is run through
        // the `Number` function first to coerce it to a numeric value.
        this._contentWrapper.nativeElement.style.transform = this._renderedContentTransform;
        // Apply changes to Angular bindings. Note: We must call `markForCheck` to run change detection
        // from the root, since the repeated items are content projected in. Calling `detectChanges`
        // instead does not properly check the projected content.
        this.ngZone.run(() => this._changeDetectorRef.markForCheck());
        const runAfterChangeDetection = this._runAfterChangeDetection;
        this._runAfterChangeDetection = [];
        for (const fn of runAfterChangeDetection) {
            fn();
        }
    }
    /** Calculates the `style.width` and `style.height` for the spacer element. */
    _calculateSpacerSize() {
        this._totalContentHeight =
            this.orientation === 'horizontal' ? '' : `${this._totalContentSize}px`;
        this._totalContentWidth =
            this.orientation === 'horizontal' ? `${this._totalContentSize}px` : '';
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollViewport, deps: [{ token: i0.ElementRef }, { token: i0.ChangeDetectorRef }, { token: i0.NgZone }, { token: VIRTUAL_SCROLL_STRATEGY, optional: true }, { token: i1.Directionality, optional: true }, { token: i2.ScrollDispatcher }, { token: i3.ViewportRuler }, { token: VIRTUAL_SCROLLABLE, optional: true }], target: i0.ɵɵFactoryTarget.Component }); }
    static { this.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "14.0.0", version: "16.1.1", type: CdkVirtualScrollViewport, isStandalone: true, selector: "cdk-virtual-scroll-viewport", inputs: { orientation: "orientation", appendOnly: "appendOnly" }, outputs: { scrolledIndexChange: "scrolledIndexChange" }, host: { properties: { "class.cdk-virtual-scroll-orientation-horizontal": "orientation === \"horizontal\"", "class.cdk-virtual-scroll-orientation-vertical": "orientation !== \"horizontal\"" }, classAttribute: "cdk-virtual-scroll-viewport" }, providers: [
            {
                provide: CdkScrollable,
                useFactory: (virtualScrollable, viewport) => virtualScrollable || viewport,
                deps: [[new Optional(), new Inject(VIRTUAL_SCROLLABLE)], CdkVirtualScrollViewport],
            },
        ], viewQueries: [{ propertyName: "_contentWrapper", first: true, predicate: ["contentWrapper"], descendants: true, static: true }], usesInheritance: true, ngImport: i0, template: "<!--\n  Wrap the rendered content in an element that will be used to offset it based on the scroll\n  position.\n-->\n<div #contentWrapper class=\"cdk-virtual-scroll-content-wrapper\">\n  <ng-content></ng-content>\n</div>\n<!--\n  Spacer used to force the scrolling container to the correct size for the *total* number of items\n  so that the scrollbar captures the size of the entire data set.\n-->\n<div class=\"cdk-virtual-scroll-spacer\"\n     [style.width]=\"_totalContentWidth\" [style.height]=\"_totalContentHeight\"></div>\n", styles: ["cdk-virtual-scroll-viewport{display:block;position:relative;transform:translateZ(0)}.cdk-virtual-scrollable{overflow:auto;will-change:scroll-position;contain:strict;-webkit-overflow-scrolling:touch}.cdk-virtual-scroll-content-wrapper{position:absolute;top:0;left:0;contain:content}[dir=rtl] .cdk-virtual-scroll-content-wrapper{right:0;left:auto}.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper{min-height:100%}.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>dl:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>ol:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>table:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>ul:not([cdkVirtualFor]){padding-left:0;padding-right:0;margin-left:0;margin-right:0;border-left-width:0;border-right-width:0;outline:none}.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper{min-width:100%}.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>dl:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>ol:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>table:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>ul:not([cdkVirtualFor]){padding-top:0;padding-bottom:0;margin-top:0;margin-bottom:0;border-top-width:0;border-bottom-width:0;outline:none}.cdk-virtual-scroll-spacer{height:1px;transform-origin:0 0;flex:0 0 auto}[dir=rtl] .cdk-virtual-scroll-spacer{transform-origin:100% 0}"], changeDetection: i0.ChangeDetectionStrategy.OnPush, encapsulation: i0.ViewEncapsulation.None }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollViewport, decorators: [{
            type: Component,
            args: [{ selector: 'cdk-virtual-scroll-viewport', host: {
                        'class': 'cdk-virtual-scroll-viewport',
                        '[class.cdk-virtual-scroll-orientation-horizontal]': 'orientation === "horizontal"',
                        '[class.cdk-virtual-scroll-orientation-vertical]': 'orientation !== "horizontal"',
                    }, encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.OnPush, standalone: true, providers: [
                        {
                            provide: CdkScrollable,
                            useFactory: (virtualScrollable, viewport) => virtualScrollable || viewport,
                            deps: [[new Optional(), new Inject(VIRTUAL_SCROLLABLE)], CdkVirtualScrollViewport],
                        },
                    ], template: "<!--\n  Wrap the rendered content in an element that will be used to offset it based on the scroll\n  position.\n-->\n<div #contentWrapper class=\"cdk-virtual-scroll-content-wrapper\">\n  <ng-content></ng-content>\n</div>\n<!--\n  Spacer used to force the scrolling container to the correct size for the *total* number of items\n  so that the scrollbar captures the size of the entire data set.\n-->\n<div class=\"cdk-virtual-scroll-spacer\"\n     [style.width]=\"_totalContentWidth\" [style.height]=\"_totalContentHeight\"></div>\n", styles: ["cdk-virtual-scroll-viewport{display:block;position:relative;transform:translateZ(0)}.cdk-virtual-scrollable{overflow:auto;will-change:scroll-position;contain:strict;-webkit-overflow-scrolling:touch}.cdk-virtual-scroll-content-wrapper{position:absolute;top:0;left:0;contain:content}[dir=rtl] .cdk-virtual-scroll-content-wrapper{right:0;left:auto}.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper{min-height:100%}.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>dl:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>ol:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>table:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-horizontal .cdk-virtual-scroll-content-wrapper>ul:not([cdkVirtualFor]){padding-left:0;padding-right:0;margin-left:0;margin-right:0;border-left-width:0;border-right-width:0;outline:none}.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper{min-width:100%}.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>dl:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>ol:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>table:not([cdkVirtualFor]),.cdk-virtual-scroll-orientation-vertical .cdk-virtual-scroll-content-wrapper>ul:not([cdkVirtualFor]){padding-top:0;padding-bottom:0;margin-top:0;margin-bottom:0;border-top-width:0;border-bottom-width:0;outline:none}.cdk-virtual-scroll-spacer{height:1px;transform-origin:0 0;flex:0 0 auto}[dir=rtl] .cdk-virtual-scroll-spacer{transform-origin:100% 0}"] }]
        }], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i0.ChangeDetectorRef }, { type: i0.NgZone }, { type: undefined, decorators: [{
                    type: Optional
                }, {
                    type: Inject,
                    args: [VIRTUAL_SCROLL_STRATEGY]
                }] }, { type: i1.Directionality, decorators: [{
                    type: Optional
                }] }, { type: i2.ScrollDispatcher }, { type: i3.ViewportRuler }, { type: i4.CdkVirtualScrollable, decorators: [{
                    type: Optional
                }, {
                    type: Inject,
                    args: [VIRTUAL_SCROLLABLE]
                }] }]; }, propDecorators: { orientation: [{
                type: Input
            }], appendOnly: [{
                type: Input
            }], scrolledIndexChange: [{
                type: Output
            }], _contentWrapper: [{
                type: ViewChild,
                args: ['contentWrapper', { static: true }]
            }] } });
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Directionality} from '@angular/cdk/bidi';\nimport {ListRange} from '@angular/cdk/collections';\nimport {\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ElementRef,\n  inject,\n  Inject,\n  Input,\n  NgZone,\n  OnDestroy,\n  OnInit,\n  Optional,\n  Output,\n  ViewChild,\n  ViewEncapsulation,\n} from '@angular/core';\nimport {Platform} from '@angular/cdk/platform';\nimport {\n  animationFrameScheduler,\n  asapScheduler,\n  Observable,\n  Subject,\n  Observer,\n  Subscription,\n} from 'rxjs';\nimport {auditTime, startWith, takeUntil} from 'rxjs/operators';\nimport {ScrollDispatcher} from './scroll-dispatcher';\nimport {CdkScrollable, ExtendedScrollToOptions} from './scrollable';\nimport {VIRTUAL_SCROLL_STRATEGY, VirtualScrollStrategy} from './virtual-scroll-strategy';\nimport {ViewportRuler} from './viewport-ruler';\nimport {CdkVirtualScrollRepeater} from './virtual-scroll-repeater';\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {CdkVirtualScrollable, VIRTUAL_SCROLLABLE} from './virtual-scrollable';\n\n/** Checks if the given ranges are equal. */\nfunction rangesEqual(r1: ListRange, r2: ListRange): boolean {\n  return r1.start == r2.start && r1.end == r2.end;\n}\n\n/**\n * Scheduler to be used for scroll events. Needs to fall back to\n * something that doesn't rely on requestAnimationFrame on environments\n * that don't support it (e.g. server-side rendering).\n */\nconst SCROLL_SCHEDULER =\n  typeof requestAnimationFrame !== 'undefined' ? animationFrameScheduler : asapScheduler;\n\n/** A viewport that virtualizes its scrolling with the help of `CdkVirtualForOf`. */\n@Component({\n  selector: 'cdk-virtual-scroll-viewport',\n  templateUrl: 'virtual-scroll-viewport.html',\n  styleUrls: ['virtual-scroll-viewport.css'],\n  host: {\n    'class': 'cdk-virtual-scroll-viewport',\n    '[class.cdk-virtual-scroll-orientation-horizontal]': 'orientation === \"horizontal\"',\n    '[class.cdk-virtual-scroll-orientation-vertical]': 'orientation !== \"horizontal\"',\n  },\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  standalone: true,\n  providers: [\n    {\n      provide: CdkScrollable,\n      useFactory: (\n        virtualScrollable: CdkVirtualScrollable | null,\n        viewport: CdkVirtualScrollViewport,\n      ) => virtualScrollable || viewport,\n      deps: [[new Optional(), new Inject(VIRTUAL_SCROLLABLE)], CdkVirtualScrollViewport],\n    },\n  ],\n})\nexport class CdkVirtualScrollViewport extends CdkVirtualScrollable implements OnInit, OnDestroy {\n  private _platform = inject(Platform);\n\n  /** Emits when the viewport is detached from a CdkVirtualForOf. */\n  private readonly _detachedSubject = new Subject<void>();\n\n  /** Emits when the rendered range changes. */\n  private readonly _renderedRangeSubject = new Subject<ListRange>();\n\n  /** The direction the viewport scrolls. */\n  @Input()\n  get orientation() {\n    return this._orientation;\n  }\n\n  set orientation(orientation: 'horizontal' | 'vertical') {\n    if (this._orientation !== orientation) {\n      this._orientation = orientation;\n      this._calculateSpacerSize();\n    }\n  }\n  private _orientation: 'horizontal' | 'vertical' = 'vertical';\n\n  /**\n   * Whether rendered items should persist in the DOM after scrolling out of view. By default, items\n   * will be removed.\n   */\n  @Input()\n  get appendOnly(): boolean {\n    return this._appendOnly;\n  }\n  set appendOnly(value: BooleanInput) {\n    this._appendOnly = coerceBooleanProperty(value);\n  }\n  private _appendOnly = false;\n\n  // Note: we don't use the typical EventEmitter here because we need to subscribe to the scroll\n  // strategy lazily (i.e. only if the user is actually listening to the events). We do this because\n  // depending on how the strategy calculates the scrolled index, it may come at a cost to\n  // performance.\n  /** Emits when the index of the first element visible in the viewport changes. */\n  @Output()\n  readonly scrolledIndexChange: Observable<number> = new Observable((observer: Observer<number>) =>\n    this._scrollStrategy.scrolledIndexChange.subscribe(index =>\n      Promise.resolve().then(() => this.ngZone.run(() => observer.next(index))),\n    ),\n  );\n\n  /** The element that wraps the rendered content. */\n  @ViewChild('contentWrapper', {static: true}) _contentWrapper: ElementRef<HTMLElement>;\n\n  /** A stream that emits whenever the rendered range changes. */\n  readonly renderedRangeStream: Observable<ListRange> = this._renderedRangeSubject;\n\n  /**\n   * The total size of all content (in pixels), including content that is not currently rendered.\n   */\n  private _totalContentSize = 0;\n\n  /** A string representing the `style.width` property value to be used for the spacer element. */\n  _totalContentWidth = '';\n\n  /** A string representing the `style.height` property value to be used for the spacer element. */\n  _totalContentHeight = '';\n\n  /**\n   * The CSS transform applied to the rendered subset of items so that they appear within the bounds\n   * of the visible viewport.\n   */\n  private _renderedContentTransform: string;\n\n  /** The currently rendered range of indices. */\n  private _renderedRange: ListRange = {start: 0, end: 0};\n\n  /** The length of the data bound to this viewport (in number of items). */\n  private _dataLength = 0;\n\n  /** The size of the viewport (in pixels). */\n  private _viewportSize = 0;\n\n  /** the currently attached CdkVirtualScrollRepeater. */\n  private _forOf: CdkVirtualScrollRepeater<any> | null;\n\n  /** The last rendered content offset that was set. */\n  private _renderedContentOffset = 0;\n\n  /**\n   * Whether the last rendered content offset was to the end of the content (and therefore needs to\n   * be rewritten as an offset to the start of the content).\n   */\n  private _renderedContentOffsetNeedsRewrite = false;\n\n  /** Whether there is a pending change detection cycle. */\n  private _isChangeDetectionPending = false;\n\n  /** A list of functions to run after the next change detection cycle. */\n  private _runAfterChangeDetection: Function[] = [];\n\n  /** Subscription to changes in the viewport size. */\n  private _viewportChanges = Subscription.EMPTY;\n\n  constructor(\n    public override elementRef: ElementRef<HTMLElement>,\n    private _changeDetectorRef: ChangeDetectorRef,\n    ngZone: NgZone,\n    @Optional()\n    @Inject(VIRTUAL_SCROLL_STRATEGY)\n    private _scrollStrategy: VirtualScrollStrategy,\n    @Optional() dir: Directionality,\n    scrollDispatcher: ScrollDispatcher,\n    viewportRuler: ViewportRuler,\n    @Optional() @Inject(VIRTUAL_SCROLLABLE) public scrollable: CdkVirtualScrollable,\n  ) {\n    super(elementRef, scrollDispatcher, ngZone, dir);\n\n    if (!_scrollStrategy && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('Error: cdk-virtual-scroll-viewport requires the \"itemSize\" property to be set.');\n    }\n\n    this._viewportChanges = viewportRuler.change().subscribe(() => {\n      this.checkViewportSize();\n    });\n\n    if (!this.scrollable) {\n      // No scrollable is provided, so the virtual-scroll-viewport needs to become a scrollable\n      this.elementRef.nativeElement.classList.add('cdk-virtual-scrollable');\n      this.scrollable = this;\n    }\n  }\n\n  override ngOnInit() {\n    // Scrolling depends on the element dimensions which we can't get during SSR.\n    if (!this._platform.isBrowser) {\n      return;\n    }\n\n    if (this.scrollable === this) {\n      super.ngOnInit();\n    }\n    // It's still too early to measure the viewport at this point. Deferring with a promise allows\n    // the Viewport to be rendered with the correct size before we measure. We run this outside the\n    // zone to avoid causing more change detection cycles. We handle the change detection loop\n    // ourselves instead.\n    this.ngZone.runOutsideAngular(() =>\n      Promise.resolve().then(() => {\n        this._measureViewportSize();\n        this._scrollStrategy.attach(this);\n\n        this.scrollable\n          .elementScrolled()\n          .pipe(\n            // Start off with a fake scroll event so we properly detect our initial position.\n            startWith(null),\n            // Collect multiple events into one until the next animation frame. This way if\n            // there are multiple scroll events in the same frame we only need to recheck\n            // our layout once.\n            auditTime(0, SCROLL_SCHEDULER),\n            // Usually `elementScrolled` is completed when the scrollable is destroyed, but\n            // that may not be the case if a `CdkVirtualScrollableElement` is used so we have\n            // to unsubscribe here just in case.\n            takeUntil(this._destroyed),\n          )\n          .subscribe(() => this._scrollStrategy.onContentScrolled());\n\n        this._markChangeDetectionNeeded();\n      }),\n    );\n  }\n\n  override ngOnDestroy() {\n    this.detach();\n    this._scrollStrategy.detach();\n\n    // Complete all subjects\n    this._renderedRangeSubject.complete();\n    this._detachedSubject.complete();\n    this._viewportChanges.unsubscribe();\n\n    super.ngOnDestroy();\n  }\n\n  /** Attaches a `CdkVirtualScrollRepeater` to this viewport. */\n  attach(forOf: CdkVirtualScrollRepeater<any>) {\n    if (this._forOf && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('CdkVirtualScrollViewport is already attached.');\n    }\n\n    // Subscribe to the data stream of the CdkVirtualForOf to keep track of when the data length\n    // changes. Run outside the zone to avoid triggering change detection, since we're managing the\n    // change detection loop ourselves.\n    this.ngZone.runOutsideAngular(() => {\n      this._forOf = forOf;\n      this._forOf.dataStream.pipe(takeUntil(this._detachedSubject)).subscribe(data => {\n        const newLength = data.length;\n        if (newLength !== this._dataLength) {\n          this._dataLength = newLength;\n          this._scrollStrategy.onDataLengthChanged();\n        }\n        this._doChangeDetection();\n      });\n    });\n  }\n\n  /** Detaches the current `CdkVirtualForOf`. */\n  detach() {\n    this._forOf = null;\n    this._detachedSubject.next();\n  }\n\n  /** Gets the length of the data bound to this viewport (in number of items). */\n  getDataLength(): number {\n    return this._dataLength;\n  }\n\n  /** Gets the size of the viewport (in pixels). */\n  getViewportSize(): number {\n    return this._viewportSize;\n  }\n\n  // TODO(mmalerba): This is technically out of sync with what's really rendered until a render\n  // cycle happens. I'm being careful to only call it after the render cycle is complete and before\n  // setting it to something else, but its error prone and should probably be split into\n  // `pendingRange` and `renderedRange`, the latter reflecting whats actually in the DOM.\n\n  /** Get the current rendered range of items. */\n  getRenderedRange(): ListRange {\n    return this._renderedRange;\n  }\n\n  measureBoundingClientRectWithScrollOffset(from: 'left' | 'top' | 'right' | 'bottom'): number {\n    return this.getElementRef().nativeElement.getBoundingClientRect()[from];\n  }\n\n  /**\n   * Sets the total size of all content (in pixels), including content that is not currently\n   * rendered.\n   */\n  setTotalContentSize(size: number) {\n    if (this._totalContentSize !== size) {\n      this._totalContentSize = size;\n      this._calculateSpacerSize();\n      this._markChangeDetectionNeeded();\n    }\n  }\n\n  /** Sets the currently rendered range of indices. */\n  setRenderedRange(range: ListRange) {\n    if (!rangesEqual(this._renderedRange, range)) {\n      if (this.appendOnly) {\n        range = {start: 0, end: Math.max(this._renderedRange.end, range.end)};\n      }\n      this._renderedRangeSubject.next((this._renderedRange = range));\n      this._markChangeDetectionNeeded(() => this._scrollStrategy.onContentRendered());\n    }\n  }\n\n  /**\n   * Gets the offset from the start of the viewport to the start of the rendered data (in pixels).\n   */\n  getOffsetToRenderedContentStart(): number | null {\n    return this._renderedContentOffsetNeedsRewrite ? null : this._renderedContentOffset;\n  }\n\n  /**\n   * Sets the offset from the start of the viewport to either the start or end of the rendered data\n   * (in pixels).\n   */\n  setRenderedContentOffset(offset: number, to: 'to-start' | 'to-end' = 'to-start') {\n    // In appendOnly, we always start from the top\n    offset = this.appendOnly && to === 'to-start' ? 0 : offset;\n\n    // For a horizontal viewport in a right-to-left language we need to translate along the x-axis\n    // in the negative direction.\n    const isRtl = this.dir && this.dir.value == 'rtl';\n    const isHorizontal = this.orientation == 'horizontal';\n    const axis = isHorizontal ? 'X' : 'Y';\n    const axisDirection = isHorizontal && isRtl ? -1 : 1;\n    let transform = `translate${axis}(${Number(axisDirection * offset)}px)`;\n    this._renderedContentOffset = offset;\n    if (to === 'to-end') {\n      transform += ` translate${axis}(-100%)`;\n      // The viewport should rewrite this as a `to-start` offset on the next render cycle. Otherwise\n      // elements will appear to expand in the wrong direction (e.g. `mat-expansion-panel` would\n      // expand upward).\n      this._renderedContentOffsetNeedsRewrite = true;\n    }\n    if (this._renderedContentTransform != transform) {\n      // We know this value is safe because we parse `offset` with `Number()` before passing it\n      // into the string.\n      this._renderedContentTransform = transform;\n      this._markChangeDetectionNeeded(() => {\n        if (this._renderedContentOffsetNeedsRewrite) {\n          this._renderedContentOffset -= this.measureRenderedContentSize();\n          this._renderedContentOffsetNeedsRewrite = false;\n          this.setRenderedContentOffset(this._renderedContentOffset);\n        } else {\n          this._scrollStrategy.onRenderedOffsetChanged();\n        }\n      });\n    }\n  }\n\n  /**\n   * Scrolls to the given offset from the start of the viewport. Please note that this is not always\n   * the same as setting `scrollTop` or `scrollLeft`. In a horizontal viewport with right-to-left\n   * direction, this would be the equivalent of setting a fictional `scrollRight` property.\n   * @param offset The offset to scroll to.\n   * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`.\n   */\n  scrollToOffset(offset: number, behavior: ScrollBehavior = 'auto') {\n    const options: ExtendedScrollToOptions = {behavior};\n    if (this.orientation === 'horizontal') {\n      options.start = offset;\n    } else {\n      options.top = offset;\n    }\n    this.scrollable.scrollTo(options);\n  }\n\n  /**\n   * Scrolls to the offset for the given index.\n   * @param index The index of the element to scroll to.\n   * @param behavior The ScrollBehavior to use when scrolling. Default is behavior is `auto`.\n   */\n  scrollToIndex(index: number, behavior: ScrollBehavior = 'auto') {\n    this._scrollStrategy.scrollToIndex(index, behavior);\n  }\n\n  /**\n   * Gets the current scroll offset from the start of the scrollable (in pixels).\n   * @param from The edge to measure the offset from. Defaults to 'top' in vertical mode and 'start'\n   *     in horizontal mode.\n   */\n  override measureScrollOffset(\n    from?: 'top' | 'left' | 'right' | 'bottom' | 'start' | 'end',\n  ): number {\n    // This is to break the call cycle\n    let measureScrollOffset: InstanceType<typeof CdkVirtualScrollable>['measureScrollOffset'];\n    if (this.scrollable == this) {\n      measureScrollOffset = (_from: NonNullable<typeof from>) => super.measureScrollOffset(_from);\n    } else {\n      measureScrollOffset = (_from: NonNullable<typeof from>) =>\n        this.scrollable.measureScrollOffset(_from);\n    }\n\n    return Math.max(\n      0,\n      measureScrollOffset(from ?? (this.orientation === 'horizontal' ? 'start' : 'top')) -\n        this.measureViewportOffset(),\n    );\n  }\n\n  /**\n   * Measures the offset of the viewport from the scrolling container\n   * @param from The edge to measure from.\n   */\n  measureViewportOffset(from?: 'top' | 'left' | 'right' | 'bottom' | 'start' | 'end') {\n    let fromRect: 'left' | 'top' | 'right' | 'bottom';\n    const LEFT = 'left';\n    const RIGHT = 'right';\n    const isRtl = this.dir?.value == 'rtl';\n    if (from == 'start') {\n      fromRect = isRtl ? RIGHT : LEFT;\n    } else if (from == 'end') {\n      fromRect = isRtl ? LEFT : RIGHT;\n    } else if (from) {\n      fromRect = from;\n    } else {\n      fromRect = this.orientation === 'horizontal' ? 'left' : 'top';\n    }\n\n    const scrollerClientRect = this.scrollable.measureBoundingClientRectWithScrollOffset(fromRect);\n    const viewportClientRect = this.elementRef.nativeElement.getBoundingClientRect()[fromRect];\n\n    return viewportClientRect - scrollerClientRect;\n  }\n\n  /** Measure the combined size of all of the rendered items. */\n  measureRenderedContentSize(): number {\n    const contentEl = this._contentWrapper.nativeElement;\n    return this.orientation === 'horizontal' ? contentEl.offsetWidth : contentEl.offsetHeight;\n  }\n\n  /**\n   * Measure the total combined size of the given range. Throws if the range includes items that are\n   * not rendered.\n   */\n  measureRangeSize(range: ListRange): number {\n    if (!this._forOf) {\n      return 0;\n    }\n    return this._forOf.measureRangeSize(range, this.orientation);\n  }\n\n  /** Update the viewport dimensions and re-render. */\n  checkViewportSize() {\n    // TODO: Cleanup later when add logic for handling content resize\n    this._measureViewportSize();\n    this._scrollStrategy.onDataLengthChanged();\n  }\n\n  /** Measure the viewport size. */\n  private _measureViewportSize() {\n    this._viewportSize = this.scrollable.measureViewportSize(this.orientation);\n  }\n\n  /** Queue up change detection to run. */\n  private _markChangeDetectionNeeded(runAfter?: Function) {\n    if (runAfter) {\n      this._runAfterChangeDetection.push(runAfter);\n    }\n\n    // Use a Promise to batch together calls to `_doChangeDetection`. This way if we set a bunch of\n    // properties sequentially we only have to run `_doChangeDetection` once at the end.\n    if (!this._isChangeDetectionPending) {\n      this._isChangeDetectionPending = true;\n      this.ngZone.runOutsideAngular(() =>\n        Promise.resolve().then(() => {\n          this._doChangeDetection();\n        }),\n      );\n    }\n  }\n\n  /** Run change detection. */\n  private _doChangeDetection() {\n    this._isChangeDetectionPending = false;\n\n    // Apply the content transform. The transform can't be set via an Angular binding because\n    // bypassSecurityTrustStyle is banned in Google. However the value is safe, it's composed of\n    // string literals, a variable that can only be 'X' or 'Y', and user input that is run through\n    // the `Number` function first to coerce it to a numeric value.\n    this._contentWrapper.nativeElement.style.transform = this._renderedContentTransform;\n    // Apply changes to Angular bindings. Note: We must call `markForCheck` to run change detection\n    // from the root, since the repeated items are content projected in. Calling `detectChanges`\n    // instead does not properly check the projected content.\n    this.ngZone.run(() => this._changeDetectorRef.markForCheck());\n\n    const runAfterChangeDetection = this._runAfterChangeDetection;\n    this._runAfterChangeDetection = [];\n    for (const fn of runAfterChangeDetection) {\n      fn();\n    }\n  }\n\n  /** Calculates the `style.width` and `style.height` for the spacer element. */\n  private _calculateSpacerSize() {\n    this._totalContentHeight =\n      this.orientation === 'horizontal' ? '' : `${this._totalContentSize}px`;\n    this._totalContentWidth =\n      this.orientation === 'horizontal' ? `${this._totalContentSize}px` : '';\n  }\n}\n","<!--\n  Wrap the rendered content in an element that will be used to offset it based on the scroll\n  position.\n-->\n<div #contentWrapper class=\"cdk-virtual-scroll-content-wrapper\">\n  <ng-content></ng-content>\n</div>\n<!--\n  Spacer used to force the scrolling container to the correct size for the *total* number of items\n  so that the scrollbar captures the size of the entire data set.\n-->\n<div class=\"cdk-virtual-scroll-spacer\"\n     [style.width]=\"_totalContentWidth\" [style.height]=\"_totalContentHeight\"></div>\n"]}