import { coerceNumberProperty, coerceElement, coerceBooleanProperty } from '@angular/cdk/coercion';
import * as i0 from '@angular/core';
import { InjectionToken, forwardRef, Directive, Input, Injectable, Optional, Inject, inject, Component, ViewEncapsulation, ChangeDetectionStrategy, Output, ViewChild, SkipSelf, ElementRef, NgModule } from '@angular/core';
import { Subject, of, Observable, fromEvent, animationFrameScheduler, asapScheduler, Subscription, isObservable } from 'rxjs';
import { distinctUntilChanged, auditTime, filter, takeUntil, startWith, pairwise, switchMap, shareReplay } from 'rxjs/operators';
import * as i1 from '@angular/cdk/platform';
import { getRtlScrollAxisType, supportsScrollBehavior, Platform } from '@angular/cdk/platform';
import { DOCUMENT } from '@angular/common';
import * as i2 from '@angular/cdk/bidi';
import { BidiModule } from '@angular/cdk/bidi';
import * as i2$1 from '@angular/cdk/collections';
import { isDataSource, ArrayDataSource, _VIEW_REPEATER_STRATEGY, _RecycleViewRepeaterStrategy } from '@angular/cdk/collections';
/** The injection token used to specify the virtual scrolling strategy. */
const VIRTUAL_SCROLL_STRATEGY = new InjectionToken('VIRTUAL_SCROLL_STRATEGY');
/** Virtual scrolling strategy for lists with items of known fixed size. */
class FixedSizeVirtualScrollStrategy {
/**
* @param itemSize The size of the items in the virtually scrolling list.
* @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more
* @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.
*/
constructor(itemSize, minBufferPx, maxBufferPx) {
this._scrolledIndexChange = new Subject();
/** @docs-private Implemented as part of VirtualScrollStrategy. */
this.scrolledIndexChange = this._scrolledIndexChange.pipe(distinctUntilChanged());
/** The attached viewport. */
this._viewport = null;
this._itemSize = itemSize;
this._minBufferPx = minBufferPx;
this._maxBufferPx = maxBufferPx;
}
/**
* Attaches this scroll strategy to a viewport.
* @param viewport The viewport to attach this strategy to.
*/
attach(viewport) {
this._viewport = viewport;
this._updateTotalContentSize();
this._updateRenderedRange();
}
/** Detaches this scroll strategy from the currently attached viewport. */
detach() {
this._scrolledIndexChange.complete();
this._viewport = null;
}
/**
* Update the item size and buffer size.
* @param itemSize The size of the items in the virtually scrolling list.
* @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more
* @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.
*/
updateItemAndBufferSize(itemSize, minBufferPx, maxBufferPx) {
if (maxBufferPx < minBufferPx && (typeof ngDevMode === 'undefined' || ngDevMode)) {
throw Error('CDK virtual scroll: maxBufferPx must be greater than or equal to minBufferPx');
}
this._itemSize = itemSize;
this._minBufferPx = minBufferPx;
this._maxBufferPx = maxBufferPx;
this._updateTotalContentSize();
this._updateRenderedRange();
}
/** @docs-private Implemented as part of VirtualScrollStrategy. */
onContentScrolled() {
this._updateRenderedRange();
}
/** @docs-private Implemented as part of VirtualScrollStrategy. */
onDataLengthChanged() {
this._updateTotalContentSize();
this._updateRenderedRange();
}
/** @docs-private Implemented as part of VirtualScrollStrategy. */
onContentRendered() {
/* no-op */
}
/** @docs-private Implemented as part of VirtualScrollStrategy. */
onRenderedOffsetChanged() {
/* no-op */
}
/**
* Scroll 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.
*/
scrollToIndex(index, behavior) {
if (this._viewport) {
this._viewport.scrollToOffset(index * this._itemSize, behavior);
}
}
/** Update the viewport's total content size. */
_updateTotalContentSize() {
if (!this._viewport) {
return;
}
this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSize);
}
/** Update the viewport's rendered range. */
_updateRenderedRange() {
if (!this._viewport) {
return;
}
const renderedRange = this._viewport.getRenderedRange();
const newRange = { start: renderedRange.start, end: renderedRange.end };
const viewportSize = this._viewport.getViewportSize();
const dataLength = this._viewport.getDataLength();
let scrollOffset = this._viewport.measureScrollOffset();
// Prevent NaN as result when dividing by zero.
let firstVisibleIndex = this._itemSize > 0 ? scrollOffset / this._itemSize : 0;
// If user scrolls to the bottom of the list and data changes to a smaller list
if (newRange.end > dataLength) {
// We have to recalculate the first visible index based on new data length and viewport size.
const maxVisibleItems = Math.ceil(viewportSize / this._itemSize);
const newVisibleIndex = Math.max(0, Math.min(firstVisibleIndex, dataLength - maxVisibleItems));
// If first visible index changed we must update scroll offset to handle start/end buffers
// Current range must also be adjusted to cover the new position (bottom of new list).
if (firstVisibleIndex != newVisibleIndex) {
firstVisibleIndex = newVisibleIndex;
scrollOffset = newVisibleIndex * this._itemSize;
newRange.start = Math.floor(firstVisibleIndex);
}
newRange.end = Math.max(0, Math.min(dataLength, newRange.start + maxVisibleItems));
}
const startBuffer = scrollOffset - newRange.start * this._itemSize;
if (startBuffer < this._minBufferPx && newRange.start != 0) {
const expandStart = Math.ceil((this._maxBufferPx - startBuffer) / this._itemSize);
newRange.start = Math.max(0, newRange.start - expandStart);
newRange.end = Math.min(dataLength, Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSize));
}
else {
const endBuffer = newRange.end * this._itemSize - (scrollOffset + viewportSize);
if (endBuffer < this._minBufferPx && newRange.end != dataLength) {
const expandEnd = Math.ceil((this._maxBufferPx - endBuffer) / this._itemSize);
if (expandEnd > 0) {
newRange.end = Math.min(dataLength, newRange.end + expandEnd);
newRange.start = Math.max(0, Math.floor(firstVisibleIndex - this._minBufferPx / this._itemSize));
}
}
}
this._viewport.setRenderedRange(newRange);
this._viewport.setRenderedContentOffset(this._itemSize * newRange.start);
this._scrolledIndexChange.next(Math.floor(firstVisibleIndex));
}
}
/**
* Provider factory for `FixedSizeVirtualScrollStrategy` that simply extracts the already created
* `FixedSizeVirtualScrollStrategy` from the given directive.
* @param fixedSizeDir The instance of `CdkFixedSizeVirtualScroll` to extract the
* `FixedSizeVirtualScrollStrategy` from.
*/
function _fixedSizeVirtualScrollStrategyFactory(fixedSizeDir) {
return fixedSizeDir._scrollStrategy;
}
/** A virtual scroll strategy that supports fixed-size items. */
class CdkFixedSizeVirtualScroll {
constructor() {
this._itemSize = 20;
this._minBufferPx = 100;
this._maxBufferPx = 200;
/** The scroll strategy used by this directive. */
this._scrollStrategy = new FixedSizeVirtualScrollStrategy(this.itemSize, this.minBufferPx, this.maxBufferPx);
}
/** The size of the items in the list (in pixels). */
get itemSize() {
return this._itemSize;
}
set itemSize(value) {
this._itemSize = coerceNumberProperty(value);
}
/**
* The minimum amount of buffer rendered beyond the viewport (in pixels).
* If the amount of buffer dips below this number, more items will be rendered. Defaults to 100px.
*/
get minBufferPx() {
return this._minBufferPx;
}
set minBufferPx(value) {
this._minBufferPx = coerceNumberProperty(value);
}
/**
* The number of pixels worth of buffer to render for when rendering new items. Defaults to 200px.
*/
get maxBufferPx() {
return this._maxBufferPx;
}
set maxBufferPx(value) {
this._maxBufferPx = coerceNumberProperty(value);
}
ngOnChanges() {
this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkFixedSizeVirtualScroll, deps: [], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkFixedSizeVirtualScroll, isStandalone: true, selector: "cdk-virtual-scroll-viewport[itemSize]", inputs: { itemSize: "itemSize", minBufferPx: "minBufferPx", maxBufferPx: "maxBufferPx" }, providers: [
{
provide: VIRTUAL_SCROLL_STRATEGY,
useFactory: _fixedSizeVirtualScrollStrategyFactory,
deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],
},
], usesOnChanges: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkFixedSizeVirtualScroll, decorators: [{
type: Directive,
args: [{
selector: 'cdk-virtual-scroll-viewport[itemSize]',
standalone: true,
providers: [
{
provide: VIRTUAL_SCROLL_STRATEGY,
useFactory: _fixedSizeVirtualScrollStrategyFactory,
deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],
},
],
}]
}], propDecorators: { itemSize: [{
type: Input
}], minBufferPx: [{
type: Input
}], maxBufferPx: [{
type: Input
}] } });
/** Time in ms to throttle the scrolling events by default. */
const DEFAULT_SCROLL_TIME = 20;
/**
* Service contained all registered Scrollable references and emits an event when any one of the
* Scrollable references emit a scrolled event.
*/
class ScrollDispatcher {
constructor(_ngZone, _platform, document) {
this._ngZone = _ngZone;
this._platform = _platform;
/** Subject for notifying that a registered scrollable reference element has been scrolled. */
this._scrolled = new Subject();
/** Keeps track of the global `scroll` and `resize` subscriptions. */
this._globalSubscription = null;
/** Keeps track of the amount of subscriptions to `scrolled`. Used for cleaning up afterwards. */
this._scrolledCount = 0;
/**
* Map of all the scrollable references that are registered with the service and their
* scroll event subscriptions.
*/
this.scrollContainers = new Map();
this._document = document;
}
/**
* Registers a scrollable instance with the service and listens for its scrolled events. When the
* scrollable is scrolled, the service emits the event to its scrolled observable.
* @param scrollable Scrollable instance to be registered.
*/
register(scrollable) {
if (!this.scrollContainers.has(scrollable)) {
this.scrollContainers.set(scrollable, scrollable.elementScrolled().subscribe(() => this._scrolled.next(scrollable)));
}
}
/**
* De-registers a Scrollable reference and unsubscribes from its scroll event observable.
* @param scrollable Scrollable instance to be deregistered.
*/
deregister(scrollable) {
const scrollableReference = this.scrollContainers.get(scrollable);
if (scrollableReference) {
scrollableReference.unsubscribe();
this.scrollContainers.delete(scrollable);
}
}
/**
* Returns an observable that emits an event whenever any of the registered Scrollable
* references (or window, document, or body) fire a scrolled event. Can provide a time in ms
* to override the default "throttle" time.
*
* **Note:** in order to avoid hitting change detection for every scroll event,
* all of the events emitted from this stream will be run outside the Angular zone.
* If you need to update any data bindings as a result of a scroll event, you have
* to run the callback using `NgZone.run`.
*/
scrolled(auditTimeInMs = DEFAULT_SCROLL_TIME) {
if (!this._platform.isBrowser) {
return of();
}
return new Observable((observer) => {
if (!this._globalSubscription) {
this._addGlobalListener();
}
// In the case of a 0ms delay, use an observable without auditTime
// since it does add a perceptible delay in processing overhead.
const subscription = auditTimeInMs > 0
? this._scrolled.pipe(auditTime(auditTimeInMs)).subscribe(observer)
: this._scrolled.subscribe(observer);
this._scrolledCount++;
return () => {
subscription.unsubscribe();
this._scrolledCount--;
if (!this._scrolledCount) {
this._removeGlobalListener();
}
};
});
}
ngOnDestroy() {
this._removeGlobalListener();
this.scrollContainers.forEach((_, container) => this.deregister(container));
this._scrolled.complete();
}
/**
* Returns an observable that emits whenever any of the
* scrollable ancestors of an element are scrolled.
* @param elementOrElementRef Element whose ancestors to listen for.
* @param auditTimeInMs Time to throttle the scroll events.
*/
ancestorScrolled(elementOrElementRef, auditTimeInMs) {
const ancestors = this.getAncestorScrollContainers(elementOrElementRef);
return this.scrolled(auditTimeInMs).pipe(filter(target => {
return !target || ancestors.indexOf(target) > -1;
}));
}
/** Returns all registered Scrollables that contain the provided element. */
getAncestorScrollContainers(elementOrElementRef) {
const scrollingContainers = [];
this.scrollContainers.forEach((_subscription, scrollable) => {
if (this._scrollableContainsElement(scrollable, elementOrElementRef)) {
scrollingContainers.push(scrollable);
}
});
return scrollingContainers;
}
/** Use defaultView of injected document if available or fallback to global window reference */
_getWindow() {
return this._document.defaultView || window;
}
/** Returns true if the element is contained within the provided Scrollable. */
_scrollableContainsElement(scrollable, elementOrElementRef) {
let element = coerceElement(elementOrElementRef);
let scrollableElement = scrollable.getElementRef().nativeElement;
// Traverse through the element parents until we reach null, checking if any of the elements
// are the scrollable's element.
do {
if (element == scrollableElement) {
return true;
}
} while ((element = element.parentElement));
return false;
}
/** Sets up the global scroll listeners. */
_addGlobalListener() {
this._globalSubscription = this._ngZone.runOutsideAngular(() => {
const window = this._getWindow();
return fromEvent(window.document, 'scroll').subscribe(() => this._scrolled.next());
});
}
/** Cleans up the global scroll listener. */
_removeGlobalListener() {
if (this._globalSubscription) {
this._globalSubscription.unsubscribe();
this._globalSubscription = null;
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ScrollDispatcher, deps: [{ token: i0.NgZone }, { token: i1.Platform }, { token: DOCUMENT, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ScrollDispatcher, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ScrollDispatcher, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i0.NgZone }, { type: i1.Platform }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [DOCUMENT]
}] }]; } });
/**
* Sends an event when the directive's element is scrolled. Registers itself with the
* ScrollDispatcher service to include itself as part of its collection of scrolling events that it
* can be listened to through the service.
*/
class CdkScrollable {
constructor(elementRef, scrollDispatcher, ngZone, dir) {
this.elementRef = elementRef;
this.scrollDispatcher = scrollDispatcher;
this.ngZone = ngZone;
this.dir = dir;
this._destroyed = new Subject();
this._elementScrolled = new Observable((observer) => this.ngZone.runOutsideAngular(() => fromEvent(this.elementRef.nativeElement, 'scroll')
.pipe(takeUntil(this._destroyed))
.subscribe(observer)));
}
ngOnInit() {
this.scrollDispatcher.register(this);
}
ngOnDestroy() {
this.scrollDispatcher.deregister(this);
this._destroyed.next();
this._destroyed.complete();
}
/** Returns observable that emits when a scroll event is fired on the host element. */
elementScrolled() {
return this._elementScrolled;
}
/** Gets the ElementRef for the viewport. */
getElementRef() {
return this.elementRef;
}
/**
* Scrolls to the specified offsets. This is a normalized version of the browser's native scrollTo
* method, since browsers are not consistent about what scrollLeft means in RTL. For this method
* left and right always refer to the left and right side of the scrolling container irrespective
* of the layout direction. start and end refer to left and right in an LTR context and vice-versa
* in an RTL context.
* @param options specified the offsets to scroll to.
*/
scrollTo(options) {
const el = this.elementRef.nativeElement;
const isRtl = this.dir && this.dir.value == 'rtl';
// Rewrite start & end offsets as right or left offsets.
if (options.left == null) {
options.left = isRtl ? options.end : options.start;
}
if (options.right == null) {
options.right = isRtl ? options.start : options.end;
}
// Rewrite the bottom offset as a top offset.
if (options.bottom != null) {
options.top =
el.scrollHeight - el.clientHeight - options.bottom;
}
// Rewrite the right offset as a left offset.
if (isRtl && getRtlScrollAxisType() != 0 /* RtlScrollAxisType.NORMAL */) {
if (options.left != null) {
options.right =
el.scrollWidth - el.clientWidth - options.left;
}
if (getRtlScrollAxisType() == 2 /* RtlScrollAxisType.INVERTED */) {
options.left = options.right;
}
else if (getRtlScrollAxisType() == 1 /* RtlScrollAxisType.NEGATED */) {
options.left = options.right ? -options.right : options.right;
}
}
else {
if (options.right != null) {
options.left =
el.scrollWidth - el.clientWidth - options.right;
}
}
this._applyScrollToOptions(options);
}
_applyScrollToOptions(options) {
const el = this.elementRef.nativeElement;
if (supportsScrollBehavior()) {
el.scrollTo(options);
}
else {
if (options.top != null) {
el.scrollTop = options.top;
}
if (options.left != null) {
el.scrollLeft = options.left;
}
}
}
/**
* Measures the scroll offset relative to the specified edge of the viewport. This method can be
* used instead of directly checking scrollLeft or scrollTop, since browsers are not consistent
* about what scrollLeft means in RTL. The values returned by this method are normalized such that
* left and right always refer to the left and right side of the scrolling container irrespective
* of the layout direction. start and end refer to left and right in an LTR context and vice-versa
* in an RTL context.
* @param from The edge to measure from.
*/
measureScrollOffset(from) {
const LEFT = 'left';
const RIGHT = 'right';
const el = this.elementRef.nativeElement;
if (from == 'top') {
return el.scrollTop;
}
if (from == 'bottom') {
return el.scrollHeight - el.clientHeight - el.scrollTop;
}
// Rewrite start & end as left or right offsets.
const isRtl = this.dir && this.dir.value == 'rtl';
if (from == 'start') {
from = isRtl ? RIGHT : LEFT;
}
else if (from == 'end') {
from = isRtl ? LEFT : RIGHT;
}
if (isRtl && getRtlScrollAxisType() == 2 /* RtlScrollAxisType.INVERTED */) {
// For INVERTED, scrollLeft is (scrollWidth - clientWidth) when scrolled all the way left and
// 0 when scrolled all the way right.
if (from == LEFT) {
return el.scrollWidth - el.clientWidth - el.scrollLeft;
}
else {
return el.scrollLeft;
}
}
else if (isRtl && getRtlScrollAxisType() == 1 /* RtlScrollAxisType.NEGATED */) {
// For NEGATED, scrollLeft is -(scrollWidth - clientWidth) when scrolled all the way left and
// 0 when scrolled all the way right.
if (from == LEFT) {
return el.scrollLeft + el.scrollWidth - el.clientWidth;
}
else {
return -el.scrollLeft;
}
}
else {
// For NORMAL, as well as non-RTL contexts, scrollLeft is 0 when scrolled all the way left and
// (scrollWidth - clientWidth) when scrolled all the way right.
if (from == LEFT) {
return el.scrollLeft;
}
else {
return el.scrollWidth - el.clientWidth - el.scrollLeft;
}
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkScrollable, deps: [{ token: i0.ElementRef }, { token: ScrollDispatcher }, { token: i0.NgZone }, { token: i2.Directionality, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkScrollable, isStandalone: true, selector: "[cdk-scrollable], [cdkScrollable]", ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkScrollable, decorators: [{
type: Directive,
args: [{
selector: '[cdk-scrollable], [cdkScrollable]',
standalone: true,
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: ScrollDispatcher }, { type: i0.NgZone }, { type: i2.Directionality, decorators: [{
type: Optional
}] }]; } });
/** Time in ms to throttle the resize events by default. */
const DEFAULT_RESIZE_TIME = 20;
/**
* Simple utility for getting the bounds of the browser viewport.
* @docs-private
*/
class ViewportRuler {
constructor(_platform, ngZone, document) {
this._platform = _platform;
/** Stream of viewport change events. */
this._change = new Subject();
/** Event listener that will be used to handle the viewport change events. */
this._changeListener = (event) => {
this._change.next(event);
};
this._document = document;
ngZone.runOutsideAngular(() => {
if (_platform.isBrowser) {
const window = this._getWindow();
// Note that bind the events ourselves, rather than going through something like RxJS's
// `fromEvent` so that we can ensure that they're bound outside of the NgZone.
window.addEventListener('resize', this._changeListener);
window.addEventListener('orientationchange', this._changeListener);
}
// Clear the cached position so that the viewport is re-measured next time it is required.
// We don't need to keep track of the subscription, because it is completed on destroy.
this.change().subscribe(() => (this._viewportSize = null));
});
}
ngOnDestroy() {
if (this._platform.isBrowser) {
const window = this._getWindow();
window.removeEventListener('resize', this._changeListener);
window.removeEventListener('orientationchange', this._changeListener);
}
this._change.complete();
}
/** Returns the viewport's width and height. */
getViewportSize() {
if (!this._viewportSize) {
this._updateViewportSize();
}
const output = { width: this._viewportSize.width, height: this._viewportSize.height };
// If we're not on a browser, don't cache the size since it'll be mocked out anyway.
if (!this._platform.isBrowser) {
this._viewportSize = null;
}
return output;
}
/** Gets a ClientRect for the viewport's bounds. */
getViewportRect() {
// Use the document element's bounding rect rather than the window scroll properties
// (e.g. pageYOffset, scrollY) due to in issue in Chrome and IE where window scroll
// properties and client coordinates (boundingClientRect, clientX/Y, etc.) are in different
// conceptual viewports. Under most circumstances these viewports are equivalent, but they
// can disagree when the page is pinch-zoomed (on devices that support touch).
// See https://bugs.chromium.org/p/chromium/issues/detail?id=489206#c4
// We use the documentElement instead of the body because, by default (without a css reset)
// browsers typically give the document body an 8px margin, which is not included in
// getBoundingClientRect().
const scrollPosition = this.getViewportScrollPosition();
const { width, height } = this.getViewportSize();
return {
top: scrollPosition.top,
left: scrollPosition.left,
bottom: scrollPosition.top + height,
right: scrollPosition.left + width,
height,
width,
};
}
/** Gets the (top, left) scroll position of the viewport. */
getViewportScrollPosition() {
// While we can get a reference to the fake document
// during SSR, it doesn't have getBoundingClientRect.
if (!this._platform.isBrowser) {
return { top: 0, left: 0 };
}
// The top-left-corner of the viewport is determined by the scroll position of the document
// body, normally just (scrollLeft, scrollTop). However, Chrome and Firefox disagree about
// whether `document.body` or `document.documentElement` is the scrolled element, so reading
// `scrollTop` and `scrollLeft` is inconsistent. However, using the bounding rect of
// `document.documentElement` works consistently, where the `top` and `left` values will
// equal negative the scroll position.
const document = this._document;
const window = this._getWindow();
const documentElement = document.documentElement;
const documentRect = documentElement.getBoundingClientRect();
const top = -documentRect.top ||
document.body.scrollTop ||
window.scrollY ||
documentElement.scrollTop ||
0;
const left = -documentRect.left ||
document.body.scrollLeft ||
window.scrollX ||
documentElement.scrollLeft ||
0;
return { top, left };
}
/**
* Returns a stream that emits whenever the size of the viewport changes.
* This stream emits outside of the Angular zone.
* @param throttleTime Time in milliseconds to throttle the stream.
*/
change(throttleTime = DEFAULT_RESIZE_TIME) {
return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change;
}
/** Use defaultView of injected document if available or fallback to global window reference */
_getWindow() {
return this._document.defaultView || window;
}
/** Updates the cached viewport size. */
_updateViewportSize() {
const window = this._getWindow();
this._viewportSize = this._platform.isBrowser
? { width: window.innerWidth, height: window.innerHeight }
: { width: 0, height: 0 };
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ViewportRuler, deps: [{ token: i1.Platform }, { token: i0.NgZone }, { token: DOCUMENT, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ViewportRuler, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ViewportRuler, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.Platform }, { type: i0.NgZone }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [DOCUMENT]
}] }]; } });
const VIRTUAL_SCROLLABLE = new InjectionToken('VIRTUAL_SCROLLABLE');
/**
* Extending the {@link CdkScrollable} to be used as scrolling container for virtual scrolling.
*/
class CdkVirtualScrollable extends CdkScrollable {
constructor(elementRef, scrollDispatcher, ngZone, dir) {
super(elementRef, scrollDispatcher, ngZone, dir);
}
/**
* Measure the viewport size for the provided orientation.
*
* @param orientation The orientation to measure the size from.
*/
measureViewportSize(orientation) {
const viewportEl = this.elementRef.nativeElement;
return orientation === 'horizontal' ? viewportEl.clientWidth : viewportEl.clientHeight;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollable, deps: [{ token: i0.ElementRef }, { token: ScrollDispatcher }, { token: i0.NgZone }, { token: i2.Directionality, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkVirtualScrollable, usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollable, decorators: [{
type: Directive
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: ScrollDispatcher }, { type: i0.NgZone }, { type: i2.Directionality, decorators: [{
type: Optional
}] }]; } });
/** 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`. */
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: i2.Directionality, optional: true }, { token: ScrollDispatcher }, { token: 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\n \n
\n\n\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\n \n
\n\n\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: i2.Directionality, decorators: [{
type: Optional
}] }, { type: ScrollDispatcher }, { type: ViewportRuler }, { type: 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 }]
}] } });
/** Helper to extract the offset of a DOM Node in a certain direction. */
function getOffset(orientation, direction, node) {
const el = node;
if (!el.getBoundingClientRect) {
return 0;
}
const rect = el.getBoundingClientRect();
if (orientation === 'horizontal') {
return direction === 'start' ? rect.left : rect.right;
}
return direction === 'start' ? rect.top : rect.bottom;
}
/**
* A directive similar to `ngForOf` to be used for rendering data inside a virtual scrolling
* container.
*/
class CdkVirtualForOf {
/** The DataSource to display. */
get cdkVirtualForOf() {
return this._cdkVirtualForOf;
}
set cdkVirtualForOf(value) {
this._cdkVirtualForOf = value;
if (isDataSource(value)) {
this._dataSourceChanges.next(value);
}
else {
// If value is an an NgIterable, convert it to an array.
this._dataSourceChanges.next(new ArrayDataSource(isObservable(value) ? value : Array.from(value || [])));
}
}
/**
* The `TrackByFunction` to use for tracking changes. The `TrackByFunction` takes the index and
* the item and produces a value to be used as the item's identity when tracking changes.
*/
get cdkVirtualForTrackBy() {
return this._cdkVirtualForTrackBy;
}
set cdkVirtualForTrackBy(fn) {
this._needsUpdate = true;
this._cdkVirtualForTrackBy = fn
? (index, item) => fn(index + (this._renderedRange ? this._renderedRange.start : 0), item)
: undefined;
}
/** The template used to stamp out new elements. */
set cdkVirtualForTemplate(value) {
if (value) {
this._needsUpdate = true;
this._template = value;
}
}
/**
* The size of the cache used to store templates that are not being used for re-use later.
* Setting the cache size to `0` will disable caching. Defaults to 20 templates.
*/
get cdkVirtualForTemplateCacheSize() {
return this._viewRepeater.viewCacheSize;
}
set cdkVirtualForTemplateCacheSize(size) {
this._viewRepeater.viewCacheSize = coerceNumberProperty(size);
}
constructor(
/** The view container to add items to. */
_viewContainerRef,
/** The template to use when stamping out new items. */
_template,
/** The set of available differs. */
_differs,
/** The strategy used to render items in the virtual scroll viewport. */
_viewRepeater,
/** The virtual scrolling viewport that these items are being rendered in. */
_viewport, ngZone) {
this._viewContainerRef = _viewContainerRef;
this._template = _template;
this._differs = _differs;
this._viewRepeater = _viewRepeater;
this._viewport = _viewport;
/** Emits when the rendered view of the data changes. */
this.viewChange = new Subject();
/** Subject that emits when a new DataSource instance is given. */
this._dataSourceChanges = new Subject();
/** Emits whenever the data in the current DataSource changes. */
this.dataStream = this._dataSourceChanges.pipe(
// Start off with null `DataSource`.
startWith(null),
// Bundle up the previous and current data sources so we can work with both.
pairwise(),
// Use `_changeDataSource` to disconnect from the previous data source and connect to the
// new one, passing back a stream of data changes which we run through `switchMap` to give
// us a data stream that emits the latest data from whatever the current `DataSource` is.
switchMap(([prev, cur]) => this._changeDataSource(prev, cur)),
// Replay the last emitted data when someone subscribes.
shareReplay(1));
/** The differ used to calculate changes to the data. */
this._differ = null;
/** Whether the rendered data should be updated during the next ngDoCheck cycle. */
this._needsUpdate = false;
this._destroyed = new Subject();
this.dataStream.subscribe(data => {
this._data = data;
this._onRenderedDataChange();
});
this._viewport.renderedRangeStream.pipe(takeUntil(this._destroyed)).subscribe(range => {
this._renderedRange = range;
if (this.viewChange.observers.length) {
ngZone.run(() => this.viewChange.next(this._renderedRange));
}
this._onRenderedDataChange();
});
this._viewport.attach(this);
}
/**
* Measures the combined size (width for horizontal orientation, height for vertical) of all items
* in the specified range. Throws an error if the range includes items that are not currently
* rendered.
*/
measureRangeSize(range, orientation) {
if (range.start >= range.end) {
return 0;
}
if ((range.start < this._renderedRange.start || range.end > this._renderedRange.end) &&
(typeof ngDevMode === 'undefined' || ngDevMode)) {
throw Error(`Error: attempted to measure an item that isn't rendered.`);
}
// The index into the list of rendered views for the first item in the range.
const renderedStartIndex = range.start - this._renderedRange.start;
// The length of the range we're measuring.
const rangeLen = range.end - range.start;
// Loop over all the views, find the first and land node and compute the size by subtracting
// the top of the first node from the bottom of the last one.
let firstNode;
let lastNode;
// Find the first node by starting from the beginning and going forwards.
for (let i = 0; i < rangeLen; i++) {
const view = this._viewContainerRef.get(i + renderedStartIndex);
if (view && view.rootNodes.length) {
firstNode = lastNode = view.rootNodes[0];
break;
}
}
// Find the last node by starting from the end and going backwards.
for (let i = rangeLen - 1; i > -1; i--) {
const view = this._viewContainerRef.get(i + renderedStartIndex);
if (view && view.rootNodes.length) {
lastNode = view.rootNodes[view.rootNodes.length - 1];
break;
}
}
return firstNode && lastNode
? getOffset(orientation, 'end', lastNode) - getOffset(orientation, 'start', firstNode)
: 0;
}
ngDoCheck() {
if (this._differ && this._needsUpdate) {
// TODO(mmalerba): We should differentiate needs update due to scrolling and a new portion of
// this list being rendered (can use simpler algorithm) vs needs update due to data actually
// changing (need to do this diff).
const changes = this._differ.diff(this._renderedItems);
if (!changes) {
this._updateContext();
}
else {
this._applyChanges(changes);
}
this._needsUpdate = false;
}
}
ngOnDestroy() {
this._viewport.detach();
this._dataSourceChanges.next(undefined);
this._dataSourceChanges.complete();
this.viewChange.complete();
this._destroyed.next();
this._destroyed.complete();
this._viewRepeater.detach();
}
/** React to scroll state changes in the viewport. */
_onRenderedDataChange() {
if (!this._renderedRange) {
return;
}
this._renderedItems = this._data.slice(this._renderedRange.start, this._renderedRange.end);
if (!this._differ) {
// Use a wrapper function for the `trackBy` so any new values are
// picked up automatically without having to recreate the differ.
this._differ = this._differs.find(this._renderedItems).create((index, item) => {
return this.cdkVirtualForTrackBy ? this.cdkVirtualForTrackBy(index, item) : item;
});
}
this._needsUpdate = true;
}
/** Swap out one `DataSource` for another. */
_changeDataSource(oldDs, newDs) {
if (oldDs) {
oldDs.disconnect(this);
}
this._needsUpdate = true;
return newDs ? newDs.connect(this) : of();
}
/** Update the `CdkVirtualForOfContext` for all views. */
_updateContext() {
const count = this._data.length;
let i = this._viewContainerRef.length;
while (i--) {
const view = this._viewContainerRef.get(i);
view.context.index = this._renderedRange.start + i;
view.context.count = count;
this._updateComputedContextProperties(view.context);
view.detectChanges();
}
}
/** Apply changes to the DOM. */
_applyChanges(changes) {
this._viewRepeater.applyChanges(changes, this._viewContainerRef, (record, _adjustedPreviousIndex, currentIndex) => this._getEmbeddedViewArgs(record, currentIndex), record => record.item);
// Update $implicit for any items that had an identity change.
changes.forEachIdentityChange((record) => {
const view = this._viewContainerRef.get(record.currentIndex);
view.context.$implicit = record.item;
});
// Update the context variables on all items.
const count = this._data.length;
let i = this._viewContainerRef.length;
while (i--) {
const view = this._viewContainerRef.get(i);
view.context.index = this._renderedRange.start + i;
view.context.count = count;
this._updateComputedContextProperties(view.context);
}
}
/** Update the computed properties on the `CdkVirtualForOfContext`. */
_updateComputedContextProperties(context) {
context.first = context.index === 0;
context.last = context.index === context.count - 1;
context.even = context.index % 2 === 0;
context.odd = !context.even;
}
_getEmbeddedViewArgs(record, index) {
// Note that it's important that we insert the item directly at the proper index,
// rather than inserting it and the moving it in place, because if there's a directive
// on the same node that injects the `ViewContainerRef`, Angular will insert another
// comment node which can throw off the move when it's being repeated for all items.
return {
templateRef: this._template,
context: {
$implicit: record.item,
// It's guaranteed that the iterable is not "undefined" or "null" because we only
// generate views for elements if the "cdkVirtualForOf" iterable has elements.
cdkVirtualForOf: this._cdkVirtualForOf,
index: -1,
count: -1,
first: false,
last: false,
odd: false,
even: false,
},
index,
};
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualForOf, deps: [{ token: i0.ViewContainerRef }, { token: i0.TemplateRef }, { token: i0.IterableDiffers }, { token: _VIEW_REPEATER_STRATEGY }, { token: CdkVirtualScrollViewport, skipSelf: true }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkVirtualForOf, isStandalone: true, selector: "[cdkVirtualFor][cdkVirtualForOf]", inputs: { cdkVirtualForOf: "cdkVirtualForOf", cdkVirtualForTrackBy: "cdkVirtualForTrackBy", cdkVirtualForTemplate: "cdkVirtualForTemplate", cdkVirtualForTemplateCacheSize: "cdkVirtualForTemplateCacheSize" }, providers: [{ provide: _VIEW_REPEATER_STRATEGY, useClass: _RecycleViewRepeaterStrategy }], ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualForOf, decorators: [{
type: Directive,
args: [{
selector: '[cdkVirtualFor][cdkVirtualForOf]',
providers: [{ provide: _VIEW_REPEATER_STRATEGY, useClass: _RecycleViewRepeaterStrategy }],
standalone: true,
}]
}], ctorParameters: function () { return [{ type: i0.ViewContainerRef }, { type: i0.TemplateRef }, { type: i0.IterableDiffers }, { type: i2$1._RecycleViewRepeaterStrategy, decorators: [{
type: Inject,
args: [_VIEW_REPEATER_STRATEGY]
}] }, { type: CdkVirtualScrollViewport, decorators: [{
type: SkipSelf
}] }, { type: i0.NgZone }]; }, propDecorators: { cdkVirtualForOf: [{
type: Input
}], cdkVirtualForTrackBy: [{
type: Input
}], cdkVirtualForTemplate: [{
type: Input
}], cdkVirtualForTemplateCacheSize: [{
type: Input
}] } });
/**
* Provides a virtual scrollable for the element it is attached to.
*/
class CdkVirtualScrollableElement extends CdkVirtualScrollable {
constructor(elementRef, scrollDispatcher, ngZone, dir) {
super(elementRef, scrollDispatcher, ngZone, dir);
}
measureBoundingClientRectWithScrollOffset(from) {
return (this.getElementRef().nativeElement.getBoundingClientRect()[from] -
this.measureScrollOffset(from));
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollableElement, deps: [{ token: i0.ElementRef }, { token: ScrollDispatcher }, { token: i0.NgZone }, { token: i2.Directionality, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkVirtualScrollableElement, isStandalone: true, selector: "[cdkVirtualScrollingElement]", host: { classAttribute: "cdk-virtual-scrollable" }, providers: [{ provide: VIRTUAL_SCROLLABLE, useExisting: CdkVirtualScrollableElement }], usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollableElement, decorators: [{
type: Directive,
args: [{
selector: '[cdkVirtualScrollingElement]',
providers: [{ provide: VIRTUAL_SCROLLABLE, useExisting: CdkVirtualScrollableElement }],
standalone: true,
host: {
'class': 'cdk-virtual-scrollable',
},
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: ScrollDispatcher }, { type: i0.NgZone }, { type: i2.Directionality, decorators: [{
type: Optional
}] }]; } });
/**
* Provides as virtual scrollable for the global / window scrollbar.
*/
class CdkVirtualScrollableWindow extends CdkVirtualScrollable {
constructor(scrollDispatcher, ngZone, dir) {
super(new ElementRef(document.documentElement), scrollDispatcher, ngZone, dir);
this._elementScrolled = new Observable((observer) => this.ngZone.runOutsideAngular(() => fromEvent(document, 'scroll').pipe(takeUntil(this._destroyed)).subscribe(observer)));
}
measureBoundingClientRectWithScrollOffset(from) {
return this.getElementRef().nativeElement.getBoundingClientRect()[from];
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollableWindow, deps: [{ token: ScrollDispatcher }, { token: i0.NgZone }, { token: i2.Directionality, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkVirtualScrollableWindow, isStandalone: true, selector: "cdk-virtual-scroll-viewport[scrollWindow]", providers: [{ provide: VIRTUAL_SCROLLABLE, useExisting: CdkVirtualScrollableWindow }], usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollableWindow, decorators: [{
type: Directive,
args: [{
selector: 'cdk-virtual-scroll-viewport[scrollWindow]',
providers: [{ provide: VIRTUAL_SCROLLABLE, useExisting: CdkVirtualScrollableWindow }],
standalone: true,
}]
}], ctorParameters: function () { return [{ type: ScrollDispatcher }, { type: i0.NgZone }, { type: i2.Directionality, decorators: [{
type: Optional
}] }]; } });
class CdkScrollableModule {
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkScrollableModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule }); }
static { this.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "14.0.0", version: "16.1.1", ngImport: i0, type: CdkScrollableModule, imports: [CdkScrollable], exports: [CdkScrollable] }); }
static { this.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkScrollableModule }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkScrollableModule, decorators: [{
type: NgModule,
args: [{
exports: [CdkScrollable],
imports: [CdkScrollable],
}]
}] });
/**
* @docs-primary-export
*/
class ScrollingModule {
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ScrollingModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule }); }
static { this.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "14.0.0", version: "16.1.1", ngImport: i0, type: ScrollingModule, imports: [BidiModule, CdkScrollableModule, CdkVirtualScrollViewport,
CdkFixedSizeVirtualScroll,
CdkVirtualForOf,
CdkVirtualScrollableWindow,
CdkVirtualScrollableElement], exports: [BidiModule, CdkScrollableModule, CdkFixedSizeVirtualScroll,
CdkVirtualForOf,
CdkVirtualScrollViewport,
CdkVirtualScrollableWindow,
CdkVirtualScrollableElement] }); }
static { this.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ScrollingModule, imports: [BidiModule,
CdkScrollableModule, BidiModule, CdkScrollableModule] }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ScrollingModule, decorators: [{
type: NgModule,
args: [{
imports: [
BidiModule,
CdkScrollableModule,
CdkVirtualScrollViewport,
CdkFixedSizeVirtualScroll,
CdkVirtualForOf,
CdkVirtualScrollableWindow,
CdkVirtualScrollableElement,
],
exports: [
BidiModule,
CdkScrollableModule,
CdkFixedSizeVirtualScroll,
CdkVirtualForOf,
CdkVirtualScrollViewport,
CdkVirtualScrollableWindow,
CdkVirtualScrollableElement,
],
}]
}] });
/**
* Generated bundle index. Do not edit.
*/
export { CdkFixedSizeVirtualScroll, CdkScrollable, CdkScrollableModule, CdkVirtualForOf, CdkVirtualScrollViewport, CdkVirtualScrollable, CdkVirtualScrollableElement, CdkVirtualScrollableWindow, DEFAULT_RESIZE_TIME, DEFAULT_SCROLL_TIME, FixedSizeVirtualScrollStrategy, ScrollDispatcher, ScrollingModule, VIRTUAL_SCROLLABLE, VIRTUAL_SCROLL_STRATEGY, ViewportRuler, _fixedSizeVirtualScrollStrategyFactory };
//# sourceMappingURL=scrolling.mjs.map