| 1 | import { getMatScrollStrategyAlreadyAttachedError } from './scroll-strategy';
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| 2 | /**
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| 3 | * Strategy that will close the overlay as soon as the user starts scrolling.
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| 4 | */
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| 5 | export class CloseScrollStrategy {
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| 6 | constructor(_scrollDispatcher, _ngZone, _viewportRuler, _config) {
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| 7 | this._scrollDispatcher = _scrollDispatcher;
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| 8 | this._ngZone = _ngZone;
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| 9 | this._viewportRuler = _viewportRuler;
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| 10 | this._config = _config;
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| 11 | this._scrollSubscription = null;
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| 12 | /** Detaches the overlay ref and disables the scroll strategy. */
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| 13 | this._detach = () => {
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| 14 | this.disable();
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| 15 | if (this._overlayRef.hasAttached()) {
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| 16 | this._ngZone.run(() => this._overlayRef.detach());
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| 17 | }
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| 18 | };
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| 19 | }
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| 20 | /** Attaches this scroll strategy to an overlay. */
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| 21 | attach(overlayRef) {
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| 22 | if (this._overlayRef && (typeof ngDevMode === 'undefined' || ngDevMode)) {
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| 23 | throw getMatScrollStrategyAlreadyAttachedError();
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| 24 | }
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| 25 | this._overlayRef = overlayRef;
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| 26 | }
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| 27 | /** Enables the closing of the attached overlay on scroll. */
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| 28 | enable() {
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| 29 | if (this._scrollSubscription) {
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| 30 | return;
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| 31 | }
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| 32 | const stream = this._scrollDispatcher.scrolled(0);
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| 33 | if (this._config && this._config.threshold && this._config.threshold > 1) {
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| 34 | this._initialScrollPosition = this._viewportRuler.getViewportScrollPosition().top;
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| 35 | this._scrollSubscription = stream.subscribe(() => {
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| 36 | const scrollPosition = this._viewportRuler.getViewportScrollPosition().top;
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| 37 | if (Math.abs(scrollPosition - this._initialScrollPosition) > this._config.threshold) {
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| 38 | this._detach();
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| 39 | }
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| 40 | else {
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| 41 | this._overlayRef.updatePosition();
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| 42 | }
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| 43 | });
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| 44 | }
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| 45 | else {
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| 46 | this._scrollSubscription = stream.subscribe(this._detach);
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| 47 | }
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| 48 | }
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| 49 | /** Disables the closing 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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