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| 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 { ScrollStrategy } from './scroll-strategy';
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| 9 | import { ViewportRuler } from '@angular/cdk/scrolling';
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| 10 | /**
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| 11 | * Strategy that will prevent the user from scrolling while the overlay is visible.
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| 12 | */
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| 13 | export declare class BlockScrollStrategy implements ScrollStrategy {
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| 14 | private _viewportRuler;
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| 15 | private _previousHTMLStyles;
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| 16 | private _previousScrollPosition;
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| 17 | private _isEnabled;
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| 18 | private _document;
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| 19 | constructor(_viewportRuler: ViewportRuler, document: any);
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| 20 | /** Attaches this scroll strategy to an overlay. */
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| 21 | attach(): void;
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| 22 | /** Blocks page-level scroll while the attached overlay is open. */
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| 23 | enable(): void;
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| 24 | /** Unblocks page-level scroll while the attached overlay is open. */
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| 25 | disable(): void;
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| 26 | private _canBeEnabled;
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| 27 | }
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