| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { getMatScrollStrategyAlreadyAttachedError } from './scroll-strategy';
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| 9 | import { isElementScrolledOutsideView } from '../position/scroll-clip';
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| 10 | /**
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| 11 | * Strategy that will update the element position as the user is scrolling.
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| 12 | */
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| 13 | export class RepositionScrollStrategy {
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| 14 | constructor(_scrollDispatcher, _viewportRuler, _ngZone, _config) {
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| 15 | this._scrollDispatcher = _scrollDispatcher;
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| 16 | this._viewportRuler = _viewportRuler;
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| 17 | this._ngZone = _ngZone;
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| 18 | this._config = _config;
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| 19 | this._scrollSubscription = null;
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| 20 | }
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| 21 | /** Attaches this scroll strategy to an overlay. */
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| 22 | attach(overlayRef) {
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| 23 | if (this._overlayRef && (typeof ngDevMode === 'undefined' || ngDevMode)) {
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| 24 | throw getMatScrollStrategyAlreadyAttachedError();
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| 25 | }
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| 26 | this._overlayRef = overlayRef;
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| 27 | }
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| 28 | /** Enables repositioning of the attached overlay on scroll. */
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| 29 | enable() {
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| 30 | if (!this._scrollSubscription) {
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| 31 | const throttle = this._config ? this._config.scrollThrottle : 0;
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| 32 | this._scrollSubscription = this._scrollDispatcher.scrolled(throttle).subscribe(() => {
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| 33 | this._overlayRef.updatePosition();
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| 34 | // TODO(crisbeto): make `close` on by default once all components can handle it.
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| 35 | if (this._config && this._config.autoClose) {
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| 36 | const overlayRect = this._overlayRef.overlayElement.getBoundingClientRect();
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| 37 | const { width, height } = this._viewportRuler.getViewportSize();
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| 38 | // TODO(crisbeto): include all ancestor scroll containers here once
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| 39 | // we have a way of exposing the trigger element to the scroll strategy.
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| 40 | const parentRects = [{ width, height, bottom: height, right: width, top: 0, left: 0 }];
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| 41 | if (isElementScrolledOutsideView(overlayRect, parentRects)) {
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| 42 | this.disable();
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| 43 | this._ngZone.run(() => this._overlayRef.detach());
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| 44 | }
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| 45 | }
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| 46 | });
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| 47 | }
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| 48 | }
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| 49 | /** Disables repositioning of the attached overlay on scroll. */
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| 50 | disable() {
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| 51 | if (this._scrollSubscription) {
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| 52 | this._scrollSubscription.unsubscribe();
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| 53 | this._scrollSubscription = null;
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| 54 | }
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| 55 | }
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| 56 | detach() {
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| 57 | this.disable();
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| 58 | this._overlayRef = null;
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| 59 | }
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| 60 | }
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| 61 | //# 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