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31 lines
1.1 KiB
31 lines
1.1 KiB
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import { ViewportRuler } from '@angular/cdk/scrolling';
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/** Object holding the scroll position of something. */
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interface ScrollPosition {
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top: number;
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left: number;
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}
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/** Keeps track of the scroll position and dimensions of the parents of an element. */
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export declare class ParentPositionTracker {
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private _document;
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private _viewportRuler;
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/** Cached positions of the scrollable parent elements. */
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readonly positions: Map<HTMLElement | Document, {
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scrollPosition: ScrollPosition;
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clientRect?: ClientRect | undefined;
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}>;
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constructor(_document: Document, _viewportRuler: ViewportRuler);
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/** Clears the cached positions. */
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clear(): void;
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/** Caches the positions. Should be called at the beginning of a drag sequence. */
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cache(elements: readonly HTMLElement[]): void;
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/** Handles scrolling while a drag is taking place. */
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handleScroll(event: Event): ScrollPosition | null;
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}
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export {};
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