@angular/cdk
Version:
Angular Material Component Development Kit
1,590 lines • 60 kB
JavaScript
/**
* @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 { InjectionToken, Directive, forwardRef, Input, Injectable, NgZone, Optional, SkipSelf, ElementRef, NgModule, IterableDiffers, TemplateRef, ViewContainerRef, ChangeDetectionStrategy, ChangeDetectorRef, Component, Inject, Output, ViewChild, ViewEncapsulation, defineInjectable, inject } from '@angular/core';
import { coerceNumberProperty } from '@angular/cdk/coercion';
import { Subject, fromEvent, of, Observable, animationFrameScheduler, merge } from 'rxjs';
import { distinctUntilChanged, auditTime, filter, takeUntil, startWith, pairwise, shareReplay, switchMap } from 'rxjs/operators';
import { Platform, getRtlScrollAxisType, RtlScrollAxisType, supportsScrollBehavior, PlatformModule } from '@angular/cdk/platform';
import { Directionality, BidiModule } from '@angular/cdk/bidi';
import { ArrayDataSource, DataSource } from '@angular/cdk/collections';
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/** *
* The injection token used to specify the virtual scrolling strategy.
@type {?} */
const VIRTUAL_SCROLL_STRATEGY = new InjectionToken('VIRTUAL_SCROLL_STRATEGY');
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/**
* 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.
* @return {?}
*/
attach(viewport) {
this._viewport = viewport;
this._updateTotalContentSize();
this._updateRenderedRange();
}
/**
* Detaches this scroll strategy from the currently attached viewport.
* @return {?}
*/
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.
* @return {?}
*/
updateItemAndBufferSize(itemSize, minBufferPx, maxBufferPx) {
if (maxBufferPx < minBufferPx) {
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.
* @return {?}
*/
onContentScrolled() {
this._updateRenderedRange();
}
/**
* \@docs-private Implemented as part of VirtualScrollStrategy.
* @return {?}
*/
onDataLengthChanged() {
this._updateTotalContentSize();
this._updateRenderedRange();
}
/**
* \@docs-private Implemented as part of VirtualScrollStrategy.
* @return {?}
*/
onContentRendered() {
/* no-op */
}
/**
* \@docs-private Implemented as part of VirtualScrollStrategy.
* @return {?}
*/
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.
* @return {?}
*/
scrollToIndex(index, behavior) {
if (this._viewport) {
this._viewport.scrollToOffset(index * this._itemSize, behavior);
}
}
/**
* Update the viewport's total content size.
* @return {?}
*/
_updateTotalContentSize() {
if (!this._viewport) {
return;
}
this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSize);
}
/**
* Update the viewport's rendered range.
* @return {?}
*/
_updateRenderedRange() {
if (!this._viewport) {
return;
}
/** @type {?} */
const scrollOffset = this._viewport.measureScrollOffset();
/** @type {?} */
const firstVisibleIndex = scrollOffset / this._itemSize;
/** @type {?} */
const renderedRange = this._viewport.getRenderedRange();
/** @type {?} */
const newRange = { start: renderedRange.start, end: renderedRange.end };
/** @type {?} */
const viewportSize = this._viewport.getViewportSize();
/** @type {?} */
const dataLength = this._viewport.getDataLength();
/** @type {?} */
const startBuffer = scrollOffset - newRange.start * this._itemSize;
if (startBuffer < this._minBufferPx && newRange.start != 0) {
/** @type {?} */
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 {
/** @type {?} */
const endBuffer = newRange.end * this._itemSize - (scrollOffset + viewportSize);
if (endBuffer < this._minBufferPx && newRange.end != dataLength) {
/** @type {?} */
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.
* @return {?}
*/
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).
* @return {?}
*/
get itemSize() { return this._itemSize; }
/**
* @param {?} value
* @return {?}
*/
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.
* @return {?}
*/
get minBufferPx() { return this._minBufferPx; }
/**
* @param {?} value
* @return {?}
*/
set minBufferPx(value) { this._minBufferPx = coerceNumberProperty(value); }
/**
* The number of pixels worth of buffer to render for when rendering new items. Defaults to 200px.
* @return {?}
*/
get maxBufferPx() { return this._maxBufferPx; }
/**
* @param {?} value
* @return {?}
*/
set maxBufferPx(value) { this._maxBufferPx = coerceNumberProperty(value); }
/**
* @return {?}
*/
ngOnChanges() {
this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);
}
}
CdkFixedSizeVirtualScroll.decorators = [
{ type: Directive, args: [{
selector: 'cdk-virtual-scroll-viewport[itemSize]',
providers: [{
provide: VIRTUAL_SCROLL_STRATEGY,
useFactory: _fixedSizeVirtualScrollStrategyFactory,
deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],
}],
},] },
];
CdkFixedSizeVirtualScroll.propDecorators = {
itemSize: [{ type: Input }],
minBufferPx: [{ type: Input }],
maxBufferPx: [{ type: Input }]
};
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/** *
* Time in ms to throttle the scrolling events by default.
@type {?} */
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 {
/**
* @param {?} _ngZone
* @param {?} _platform
*/
constructor(_ngZone, _platform) {
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();
}
/**
* 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.
* @return {?}
*/
register(scrollable) {
/** @type {?} */
const scrollSubscription = scrollable.elementScrolled()
.subscribe(() => this._scrolled.next(scrollable));
this.scrollContainers.set(scrollable, scrollSubscription);
}
/**
* Deregisters a Scrollable reference and unsubscribes from its scroll event observable.
* @param {?} scrollable Scrollable instance to be deregistered.
* @return {?}
*/
deregister(scrollable) {
/** @type {?} */
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`.
* @param {?=} auditTimeInMs
* @return {?}
*/
scrolled(auditTimeInMs = DEFAULT_SCROLL_TIME) {
if (!this._platform.isBrowser) {
return of();
}
return Observable.create((observer) => {
if (!this._globalSubscription) {
this._addGlobalListener();
}
/** @type {?} */
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();
}
};
});
}
/**
* @return {?}
*/
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 {?} elementRef Element whose ancestors to listen for.
* @param {?=} auditTimeInMs Time to throttle the scroll events.
* @return {?}
*/
ancestorScrolled(elementRef, auditTimeInMs) {
/** @type {?} */
const ancestors = this.getAncestorScrollContainers(elementRef);
return this.scrolled(auditTimeInMs).pipe(filter(target => {
return !target || ancestors.indexOf(target) > -1;
}));
}
/**
* Returns all registered Scrollables that contain the provided element.
* @param {?} elementRef
* @return {?}
*/
getAncestorScrollContainers(elementRef) {
/** @type {?} */
const scrollingContainers = [];
this.scrollContainers.forEach((_subscription, scrollable) => {
if (this._scrollableContainsElement(scrollable, elementRef)) {
scrollingContainers.push(scrollable);
}
});
return scrollingContainers;
}
/**
* Returns true if the element is contained within the provided Scrollable.
* @param {?} scrollable
* @param {?} elementRef
* @return {?}
*/
_scrollableContainsElement(scrollable, elementRef) {
/** @type {?} */
let element = elementRef.nativeElement;
/** @type {?} */
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 = /** @type {?} */ ((element)).parentElement);
return false;
}
/**
* Sets up the global scroll listeners.
* @return {?}
*/
_addGlobalListener() {
this._globalSubscription = this._ngZone.runOutsideAngular(() => {
return fromEvent(window.document, 'scroll').subscribe(() => this._scrolled.next());
});
}
/**
* Cleans up the global scroll listener.
* @return {?}
*/
_removeGlobalListener() {
if (this._globalSubscription) {
this._globalSubscription.unsubscribe();
this._globalSubscription = null;
}
}
}
ScrollDispatcher.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] },
];
/** @nocollapse */
ScrollDispatcher.ctorParameters = () => [
{ type: NgZone },
{ type: Platform }
];
/** @nocollapse */ ScrollDispatcher.ngInjectableDef = defineInjectable({ factory: function ScrollDispatcher_Factory() { return new ScrollDispatcher(inject(NgZone), inject(Platform)); }, token: ScrollDispatcher, providedIn: "root" });
/**
* \@docs-private \@deprecated \@breaking-change 8.0.0
* @param {?} parentDispatcher
* @param {?} ngZone
* @param {?} platform
* @return {?}
*/
function SCROLL_DISPATCHER_PROVIDER_FACTORY(parentDispatcher, ngZone, platform) {
return parentDispatcher || new ScrollDispatcher(ngZone, platform);
}
/** *
* \@docs-private \@deprecated \@breaking-change 8.0.0
@type {?} */
const SCROLL_DISPATCHER_PROVIDER = {
// If there is already a ScrollDispatcher available, use that. Otherwise, provide a new one.
provide: ScrollDispatcher,
deps: [[new Optional(), new SkipSelf(), ScrollDispatcher], NgZone, Platform],
useFactory: SCROLL_DISPATCHER_PROVIDER_FACTORY
};
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/**
* 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 {
/**
* @param {?} elementRef
* @param {?} scrollDispatcher
* @param {?} ngZone
* @param {?=} dir
*/
constructor(elementRef, scrollDispatcher, ngZone, dir) {
this.elementRef = elementRef;
this.scrollDispatcher = scrollDispatcher;
this.ngZone = ngZone;
this.dir = dir;
this._destroyed = new Subject();
this._elementScrolled = Observable.create((observer) => this.ngZone.runOutsideAngular(() => fromEvent(this.elementRef.nativeElement, 'scroll').pipe(takeUntil(this._destroyed))
.subscribe(observer)));
}
/**
* @return {?}
*/
ngOnInit() {
this.scrollDispatcher.register(this);
}
/**
* @return {?}
*/
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.
* @return {?}
*/
elementScrolled() {
return this._elementScrolled;
}
/**
* Gets the ElementRef for the viewport.
* @return {?}
*/
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.
* @return {?}
*/
scrollTo(options) {
/** @type {?} */
const el = this.elementRef.nativeElement;
/** @type {?} */
const isRtl = this.dir && this.dir.value == 'rtl';
// Rewrite start & end offsets as right or left offsets.
options.left = options.left == null ? (isRtl ? options.end : options.start) : options.left;
options.right = options.right == null ? (isRtl ? options.start : options.end) : options.right;
// 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() != RtlScrollAxisType.NORMAL) {
if (options.left != null) {
options.right = el.scrollWidth - el.clientWidth - options.left;
}
if (getRtlScrollAxisType() == RtlScrollAxisType.INVERTED) {
options.left = options.right;
}
else if (getRtlScrollAxisType() == 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);
}
/**
* @param {?} options
* @return {?}
*/
_applyScrollToOptions(options) {
/** @type {?} */
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.
* @return {?}
*/
measureScrollOffset(from) {
/** @type {?} */
const LEFT = 'left';
/** @type {?} */
const RIGHT = 'right';
/** @type {?} */
const el = this.elementRef.nativeElement;
if (from == 'top') {
return el.scrollTop;
}
if (from == 'bottom') {
return el.scrollHeight - el.clientHeight - el.scrollTop;
}
/** @type {?} */
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() == 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() == 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;
}
}
}
}
CdkScrollable.decorators = [
{ type: Directive, args: [{
selector: '[cdk-scrollable], [cdkScrollable]'
},] },
];
/** @nocollapse */
CdkScrollable.ctorParameters = () => [
{ type: ElementRef },
{ type: ScrollDispatcher },
{ type: NgZone },
{ type: Directionality, decorators: [{ type: Optional }] }
];
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/**
* Checks if the given ranges are equal.
* @param {?} r1
* @param {?} r2
* @return {?}
*/
function rangesEqual(r1, r2) {
return r1.start == r2.start && r1.end == r2.end;
}
/**
* A viewport that virtualizes it's scrolling with the help of `CdkVirtualForOf`.
*/
class CdkVirtualScrollViewport extends CdkScrollable {
/**
* @param {?} elementRef
* @param {?} _changeDetectorRef
* @param {?} ngZone
* @param {?} _scrollStrategy
* @param {?} dir
* @param {?} scrollDispatcher
*/
constructor(elementRef, _changeDetectorRef, ngZone, _scrollStrategy, dir, scrollDispatcher) {
super(elementRef, scrollDispatcher, ngZone, dir);
this.elementRef = elementRef;
this._changeDetectorRef = _changeDetectorRef;
this._scrollStrategy = _scrollStrategy;
/**
* Emits when the viewport is detached from a CdkVirtualForOf.
*/
this._detachedSubject = new Subject();
/**
* Emits when the rendered range changes.
*/
this._renderedRangeSubject = new Subject();
/**
* The direction the viewport scrolls.
*/
this.orientation = 'vertical';
/**
* Emits when the index of the first element visible in the viewport changes.
*/
this.scrolledIndexChange = Observable.create((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.asObservable();
/**
* The transform used to scale the spacer to the same size as all content, including content that
* is not currently rendered.
*/
this._totalContentSizeTransform = '';
/**
* The total size of all content (in pixels), including content that is not currently rendered.
*/
this._totalContentSize = 0;
/**
* 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 = [];
if (!_scrollStrategy) {
throw Error('Error: cdk-virtual-scroll-viewport requires the "itemSize" property to be set.');
}
}
/**
* @return {?}
*/
ngOnInit() {
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.elementScrolled()
.pipe(
// Start off with a fake scroll event so we properly detect our initial position.
startWith(/** @type {?} */ ((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, animationFrameScheduler))
.subscribe(() => this._scrollStrategy.onContentScrolled());
this._markChangeDetectionNeeded();
}));
}
/**
* @return {?}
*/
ngOnDestroy() {
this.detach();
this._scrollStrategy.detach();
// Complete all subjects
this._renderedRangeSubject.complete();
this._detachedSubject.complete();
super.ngOnDestroy();
}
/**
* Attaches a `CdkVirtualForOf` to this viewport.
* @param {?} forOf
* @return {?}
*/
attach(forOf) {
if (this._forOf) {
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 => {
/** @type {?} */
const newLength = data.length;
if (newLength !== this._dataLength) {
this._dataLength = newLength;
this._scrollStrategy.onDataLengthChanged();
}
this._doChangeDetection();
});
});
}
/**
* Detaches the current `CdkVirtualForOf`.
* @return {?}
*/
detach() {
this._forOf = null;
this._detachedSubject.next();
}
/**
* Gets the length of the data bound to this viewport (in number of items).
* @return {?}
*/
getDataLength() {
return this._dataLength;
}
/**
* Gets the size of the viewport (in pixels).
* @return {?}
*/
getViewportSize() {
return this._viewportSize;
}
/**
* Get the current rendered range of items.
* @return {?}
*/
getRenderedRange() {
return this._renderedRange;
}
/**
* Sets the total size of all content (in pixels), including content that is not currently
* rendered.
* @param {?} size
* @return {?}
*/
setTotalContentSize(size) {
if (this._totalContentSize !== size) {
this._totalContentSize = size;
/** @type {?} */
const axis = this.orientation == 'horizontal' ? 'X' : 'Y';
this._totalContentSizeTransform = `scale${axis}(${this._totalContentSize})`;
this._markChangeDetectionNeeded();
}
}
/**
* Sets the currently rendered range of indices.
* @param {?} range
* @return {?}
*/
setRenderedRange(range) {
if (!rangesEqual(this._renderedRange, range)) {
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).
* @return {?}
*/
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).
* @param {?} offset
* @param {?=} to
* @return {?}
*/
setRenderedContentOffset(offset, to = 'to-start') {
/** @type {?} */
const isRtl = this.dir && this.dir.value == 'rtl';
/** @type {?} */
const isHorizontal = this.orientation == 'horizontal';
/** @type {?} */
const axis = isHorizontal ? 'X' : 'Y';
/** @type {?} */
const axisDirection = isHorizontal && isRtl ? -1 : 1;
/** @type {?} */
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`.
* @return {?}
*/
scrollToOffset(offset, behavior = 'auto') {
/** @type {?} */
const options = { behavior };
if (this.orientation === 'horizontal') {
options.start = offset;
}
else {
options.top = offset;
}
this.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`.
* @return {?}
*/
scrollToIndex(index, behavior = 'auto') {
this._scrollStrategy.scrollToIndex(index, behavior);
}
/**
* Gets the current scroll offset from the start of the viewport (in pixels).
* @param {?=} from The edge to measure the offset from. Defaults to 'top' in vertical mode and 'start'
* in horizontal mode.
* @return {?}
*/
measureScrollOffset(from) {
return super.measureScrollOffset(from ? from : this.orientation === 'horizontal' ? 'start' : 'top');
}
/**
* Measure the combined size of all of the rendered items.
* @return {?}
*/
measureRenderedContentSize() {
/** @type {?} */
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.
* @param {?} range
* @return {?}
*/
measureRangeSize(range) {
if (!this._forOf) {
return 0;
}
return this._forOf.measureRangeSize(range, this.orientation);
}
/**
* Update the viewport dimensions and re-render.
* @return {?}
*/
checkViewportSize() {
// TODO: Cleanup later when add logic for handling content resize
this._measureViewportSize();
this._scrollStrategy.onDataLengthChanged();
}
/**
* Measure the viewport size.
* @return {?}
*/
_measureViewportSize() {
/** @type {?} */
const viewportEl = this.elementRef.nativeElement;
this._viewportSize = this.orientation === 'horizontal' ?
viewportEl.clientWidth : viewportEl.clientHeight;
}
/**
* Queue up change detection to run.
* @param {?=} runAfter
* @return {?}
*/
_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.
* @return {?}
*/
_doChangeDetection() {
this._isChangeDetectionPending = false;
// 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());
// 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;
/** @type {?} */
const runAfterChangeDetection = this._runAfterChangeDetection;
this._runAfterChangeDetection = [];
for (const fn of runAfterChangeDetection) {
fn();
}
}
}
CdkVirtualScrollViewport.decorators = [
{ type: Component, args: [{selector: 'cdk-virtual-scroll-viewport',
template: "<div #contentWrapper class=\"cdk-virtual-scroll-content-wrapper\"><ng-content></ng-content></div><div class=\"cdk-virtual-scroll-spacer\" [style.transform]=\"_totalContentSizeTransform\"></div>",
styles: ["cdk-virtual-scroll-viewport{display:block;position:relative;overflow:auto;contain:strict;transform:translateZ(0);will-change:scroll-position;-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:0}.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:0}.cdk-virtual-scroll-spacer{position:absolute;top:0;left:0;height:1px;width:1px;transform-origin:0 0}[dir=rtl] .cdk-virtual-scroll-spacer{right:0;left:auto;transform-origin:100% 0}"],
host: {
'class': 'cdk-virtual-scroll-viewport',
'[class.cdk-virtual-scroll-orientation-horizontal]': 'orientation === "horizontal"',
'[class.cdk-virtual-scroll-orientation-vertical]': 'orientation === "vertical"',
},
encapsulation: ViewEncapsulation.None,
changeDetection: ChangeDetectionStrategy.OnPush,
},] },
];
/** @nocollapse */
CdkVirtualScrollViewport.ctorParameters = () => [
{ type: ElementRef },
{ type: ChangeDetectorRef },
{ type: NgZone },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [VIRTUAL_SCROLL_STRATEGY,] }] },
{ type: Directionality, decorators: [{ type: Optional }] },
{ type: ScrollDispatcher }
];
CdkVirtualScrollViewport.propDecorators = {
orientation: [{ type: Input }],
scrolledIndexChange: [{ type: Output }],
_contentWrapper: [{ type: ViewChild, args: ['contentWrapper',] }]
};
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/**
* Helper to extract size from a DOM Node.
* @param {?} orientation
* @param {?} node
* @return {?}
*/
function getSize(orientation, node) {
/** @type {?} */
const el = /** @type {?} */ (node);
if (!el.getBoundingClientRect) {
return 0;
}
/** @type {?} */
const rect = el.getBoundingClientRect();
return orientation == 'horizontal' ? rect.width : rect.height;
}
/**
* A directive similar to `ngForOf` to be used for rendering data inside a virtual scrolling
* container.
* @template T
*/
class CdkVirtualForOf {
/**
* @param {?} _viewContainerRef
* @param {?} _template
* @param {?} _differs
* @param {?} _viewport
* @param {?} ngZone
*/
constructor(_viewContainerRef, _template, _differs, /** The virtual scrolling viewport that these items are being rendered in. */
_viewport, ngZone) {
this._viewContainerRef = _viewContainerRef;
this._template = _template;
this._differs = _differs;
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();
/**
* 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.
*/
this.cdkVirtualForTemplateCacheSize = 20;
/**
* Emits whenever the data in the current DataSource changes.
*/
this.dataStream = this._dataSourceChanges
.pipe(
// Start off with null `DataSource`.
startWith(/** @type {?} */ ((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;
/**
* The template cache used to hold on ot template instancess that have been stamped out, but don't
* currently need to be rendered. These instances will be reused in the future rather than
* stamping out brand new ones.
*/
this._templateCache = [];
/**
* 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;
ngZone.run(() => this.viewChange.next(this._renderedRange));
this._onRenderedDataChange();
});
this._viewport.attach(this);
}
/**
* The DataSource to display.
* @return {?}
*/
get cdkVirtualForOf() {
return this._cdkVirtualForOf;
}
/**
* @param {?} value
* @return {?}
*/
set cdkVirtualForOf(value) {
this._cdkVirtualForOf = value;
/** @type {?} */
const ds = value instanceof DataSource ? value :
// Slice the value if its an NgIterable to ensure we're working with an array.
new ArrayDataSource(value instanceof Observable ? value : Array.prototype.slice.call(value || []));
this._dataSourceChanges.next(ds);
}
/**
* 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.
* @return {?}
*/
get cdkVirtualForTrackBy() {
return this._cdkVirtualForTrackBy;
}
/**
* @param {?} fn
* @return {?}
*/
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.
* @param {?} value
* @return {?}
*/
set cdkVirtualForTemplate(value) {
if (value) {
this._needsUpdate = true;
this._template = value;
}
}
/**
* 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.
* @param {?} range
* @param {?} orientation
* @return {?}
*/
measureRangeSize(range, orientation) {
if (range.start >= range.end) {
return 0;
}
if (range.start < this._renderedRange.start || range.end > this._renderedRange.end) {
throw Error(`Error: attempted to measure an item that isn't rendered.`);
}
/** @type {?} */
const renderedStartIndex = range.start - this._renderedRange.start;
/** @type {?} */
const rangeLen = range.end - range.start;
/** @type {?} */
let totalSize = 0;
/** @type {?} */
let i = rangeLen;
while (i--) {
/** @type {?} */
const view = /** @type {?} */ (this._viewContainerRef.get(i + renderedStartIndex));
/** @type {?} */
let j = view ? view.rootNodes.length : 0;
while (j--) {
totalSize += getSize(orientation, /** @type {?} */ ((view)).rootNodes[j]);
}
}
return totalSize;
}
/**
* @return {?}
*/
ngDoCheck() {
if (this._differ && this._needsUpdate) {
/** @type {?} */
const changes = this._differ.diff(this._renderedItems);
if (!changes) {
this._updateContext();
}
else {
this._applyChanges(changes);
}
this._needsUpdate = false;
}
}
/**
* @return {?}
*/
ngOnDestroy() {
this._viewport.detach();
this._dataSourceChanges.complete();
this.viewChange.complete();
this._destroyed.next();
this._destroyed.complete();
for (let view of this._templateCache) {
view.destroy();
}
}
/**
* React to scroll state changes in the viewport.
* @return {?}
*/
_onRenderedDataChange() {
if (!this._renderedRange) {
return;
}
this._renderedItems = this._data.slice(this._renderedRange.start, this._renderedRange.end);
if (!this._differ) {
this._differ = this._differs.find(this._renderedItems).create(this.cdkVirtualForTrackBy);
}
this._needsUpdate = true;
}
/**
* Swap out one `DataSource` for another.
* @param {?} oldDs
* @param {?} newDs
* @return {?}
*/
_changeDataSource(oldDs, newDs) {
if (oldDs) {
oldDs.disconnect(this);
}
this._needsUpdate = true;
return newDs.connect(this);
}
/**
* Update the `CdkVirtualForOfContext` for all views.
* @return {?}
*/
_updateContext() {
/** @type {?} */
const count = this._data.length;
/** @type {?} */
let i = this._viewContainerRef.length;
while (i--) {
/** @type {?} */
let view = /** @type {?} */ (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.
* @param {?} changes
* @return {?}
*/
_applyChanges(changes) {
// Rearrange the views to put them in the right location.
changes.forEachOperation((record, adjustedPreviousIndex, currentIndex) => {
if (record.previousIndex == null) { // Item added.
/** @type {?} */
const view = this._getViewForNewItem();
this._viewContainerRef.insert(view, /** @type {?} */ ((currentIndex)));
view.context.$implicit = record.item;
}
else if (currentIndex == null) { // Item removed.
// Item removed.
this._cacheView(/** @type {?} */ (this._viewContainerRef.detach(/** @type {?} */ ((adjustedPreviousIndex)))));
}
else { // Item moved.
/** @type {?} */
const view = /** @type {?} */ (this._viewContainerRef.get(/** @type {?} */ ((adjustedPreviousIndex))));
this._viewContainerRef.move(view, currentIndex);
view.context.$implicit = record.item;
}
});
// Update $implicit for any items that had an identity change.
changes.forEachIdentityChange((record) => {
/** @type {?} */
const view = /** @type {?} */ (this._viewContainerRef.get(/** @type {?} */ ((record.currentIndex))));
view.context.$implicit = record.item;
});
/** @type {?} */
const count = this._data.length;
/** @type {?} */
let i = this._viewContainerRef.length;
while (i--) {
/** @type {?} */
const view = /** @type {?} */ (this._viewContainerRef.get(i));
view.context.index = this._renderedRange.start + i;
view.context.count = count;
this._updateComputedContextProperties(view.context);
}
}
/**
* Cache the given detached view.
* @param {?} view
* @return {?}
*/
_cacheView(view) {
if (this._templateCache.length < this.cdkVirtualForTemplateCacheSize) {
this._templateCache.push(view);
}
else {
view.destroy();
}
}
/**
* Get a view for a new item, either from the cache or by creating a new one.
* @return {?}
*/
_getViewForNewItem() {
return this._templateCache.pop() || this._viewContainerRef.createEmbeddedView(this._template, {
$implicit: /** @type {?} */ ((null)),
cdkVirtualForOf: this._cdkVirtualForOf,
index: -1,
count: -1,
first: false,
last: false,
odd: false,
even: false
});
}
/**
* Update the computed properties on the `CdkVirtualForOfContext`.
* @param {?} context
* @return {?}
*/
_updateComputedContextProperties(context) {
context.first = context.index === 0;
context.last = context.index === context.count - 1;
context.even = context.index % 2 === 0;
context.odd = !context.even;
}
}
CdkVirtualForOf.decorators = [
{ type: Directive, args: [{
selector: '[cdkVirtualFor][cdkVirtualForOf]',
},] },
];
/** @nocollapse */
CdkVirtualForOf.ctorParameters = () => [
{ type: ViewContainerRef },
{ type: TemplateRef },
{ type: IterableDiffers },
{ type: CdkVirtualScrollViewport, decorators: [{ type: SkipSelf }] },
{ type: NgZone }
];
CdkVirtualForOf.propDecorators = {
cdkVirtualForOf: [{ type: Input }],
cdkVirtualForTrackBy: [{ type: Input }],
cdkVirtualForTemplate: [{ type: Input }],
cdkVirtualForTemplateCacheSize: [{ type: Input }]
};
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
class ScrollingModule {
}
ScrollingModule.decorators = [
{ type: NgModule, args: [{
imports: [BidiModule, PlatformModule],
exports: [
BidiModule,
CdkFixedSizeVirtualScroll,
CdkScrollable,
CdkVirtualForOf,
CdkVirtualScrollViewport,
],
declarations: [
CdkFixedSizeVirtualScroll,
CdkScrollable,
CdkVirtualForOf,
CdkVirtualScrollViewport,
],
},] },
];
/**
* @deprecated ScrollDispatchModule has been renamed to ScrollingModule.
* \@breaking-change 8.0.0 delete this alias
*/
class ScrollDispatchModule {
}
ScrollDispatchModule.decorators = [
{ type: NgModule, args: [{
imports: [ScrollingModule],
exports: [ScrollingModule],
},] },
];
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/** *
* Time in ms to throttle the resize events by default.
@type {?} */
const DEFAULT_RESIZE_TIME = 20;
/**
* Simple utility for getting the bounds of the browser viewport.
* \@docs-private
*/
class ViewportRuler {
/**
* @param {?} _platform
* @param {?} ngZone
*/
constructor(_platform, ngZone) {
this._platform = _platform;
ngZone.runOutsideAngular(() => {
this._change = _platform.isBrowser ?
merge(fromEvent(window, 'resize'), fromEvent(window, 'orientationchange')) :
of();
// Note that we need to do the subscription inside `runOutsideAngular`
// since subscribing is what causes the event listener to be added.
this._invalidateCache = this.change().subscribe(() => this._updateViewportSize());
});
}
/**
* @return {?}
*/
ngOnDestroy() {
this._invalidateCache.unsubscribe();
}
/**
* Returns the viewport's width and height.
* @return {?}
*/
getViewportSize() {
if (!this._viewportSize) {
this._updateViewportSize();
}
/** @type {?} */
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 = /** @type {?} */ ((null));
}
return output;
}
/**
* Gets a ClientRect for the viewport's bounds.
* @return {?}
*/
getViewportRect() {
/** @type {?} */
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.
* @return {?}
*/
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 };
}
/** @type {?} */
const documentElement = /** @type {?} */ ((document.documentElement));
/** @type {?} */
const documentRect = documentElement.getBoundingClientRect();
/** @type {?} */
const top = -documentRect.top || document.body.scrollTop || window.scrollY ||
documentElement.scrollTop || 0;
/** @type {?} */
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.
* @param {?=} throttleTime Time in milliseconds to throttle the stream.
* @return {?}
*/
change(throttleTime = DEFAULT_RESIZE_TIME) {
return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change;
}
/**
* Updates the cached viewport size.
* @return {?}
*/
_updateViewportSize() {
this._viewportSize = this._platform.isBrowser ?
{ width: window.innerWidth, height: window.innerHeight } :
{ width: 0, height: 0 };
}
}
ViewportRuler.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] },
];
/** @nocollapse */
ViewportRuler.ctorParameters = () => [
{ type: Platform },
{ type: NgZone }
];
/** @nocollapse */ ViewportRuler.ngInjectableDef = defineInjectable({ factory: function ViewportRuler_Factory() { return new ViewportRuler(inject(Platform), inject(NgZone)); }, token: ViewportRuler, providedIn: "root" });
/**
* \@docs-private \@deprecated \@breaking-change 8.0.0
* @param {?} parentRuler
* @param {?} platform
* @param {?} ngZone
* @return {?}
*/
function VIEWPORT_RULER_PROVIDER_FACTORY(parentRuler, platform, ngZone) {
return parentRuler || new ViewportRuler(platform, ngZone);
}
/** *
* \@docs-private \@deprecated \@breaking-change 8.0.0
@type {?} */
const VIEWPORT_RULER_PROVIDER = {
// If there is already a ViewportRuler available, use that. Otherwise, provide a new one.
provide: ViewportRuler,
deps: [[new Optional(), new SkipSelf(), ViewportRuler], Platform, NgZone],
useFactory: VIEWPORT_RULER_PROVIDER_FACTORY
};
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
export { _fixedSizeVirtualScrollStrategyFactory, FixedSizeVirtualScrollStrategy, CdkFixedSizeVirtualScroll, SCROLL_DISPATCHER_PROVIDER_FACTORY, DEFAULT_SCROLL_TIME, ScrollDispatcher, SCROLL_DISPATCHER_PROVIDER, CdkScrollable, ScrollingModule, ScrollDispatchModule, VIEWPORT_RULER_PROVIDER_FACTORY, DEFAULT_RESIZE_TIME, ViewportRuler, VIEWPORT_RULER_PROVIDER, CdkVirtualForOf, VIRTUAL_SCROLL_STRATEGY, CdkVirtualScrollViewport };
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