| import { getMatScrollStrategyAlreadyAttachedError } from './scroll-strategy'; |
| /** |
| * Strategy that will close the overlay as soon as the user starts scrolling. |
| */ |
| export class CloseScrollStrategy { |
| constructor(_scrollDispatcher, _ngZone, _viewportRuler, _config) { |
| this._scrollDispatcher = _scrollDispatcher; |
| this._ngZone = _ngZone; |
| this._viewportRuler = _viewportRuler; |
| this._config = _config; |
| this._scrollSubscription = null; |
| /** Detaches the overlay ref and disables the scroll strategy. */ |
| this._detach = () => { |
| this.disable(); |
| if (this._overlayRef.hasAttached()) { |
| this._ngZone.run(() => this._overlayRef.detach()); |
| } |
| }; |
| } |
| /** Attaches this scroll strategy to an overlay. */ |
| attach(overlayRef) { |
| if (this._overlayRef && (typeof ngDevMode === 'undefined' || ngDevMode)) { |
| throw getMatScrollStrategyAlreadyAttachedError(); |
| } |
| this._overlayRef = overlayRef; |
| } |
| /** Enables the closing of the attached overlay on scroll. */ |
| enable() { |
| if (this._scrollSubscription) { |
| return; |
| } |
| const stream = this._scrollDispatcher.scrolled(0); |
| if (this._config && this._config.threshold && this._config.threshold > 1) { |
| this._initialScrollPosition = this._viewportRuler.getViewportScrollPosition().top; |
| this._scrollSubscription = stream.subscribe(() => { |
| const scrollPosition = this._viewportRuler.getViewportScrollPosition().top; |
| if (Math.abs(scrollPosition - this._initialScrollPosition) > this._config.threshold) { |
| this._detach(); |
| } |
| else { |
| this._overlayRef.updatePosition(); |
| } |
| }); |
| } |
| else { |
| this._scrollSubscription = stream.subscribe(this._detach); |
| } |
| } |
| /** Disables the closing the attached overlay on scroll. */ |
| disable() { |
| if (this._scrollSubscription) { |
| this._scrollSubscription.unsubscribe(); |
| this._scrollSubscription = null; |
| } |
| } |
| detach() { |
| this.disable(); |
| this._overlayRef = null; |
| } |
| } |
| //# 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 |
