source: trip-planner-front/node_modules/@angular/cdk/esm2015/drag-drop/parent-position-tracker.js@ e29cc2e

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { _getEventTarget } from '@angular/cdk/platform';
import { getMutableClientRect, adjustClientRect } from './client-rect';
/** Keeps track of the scroll position and dimensions of the parents of an element. */
export class ParentPositionTracker {
    constructor(_document, _viewportRuler) {
        this._document = _document;
        this._viewportRuler = _viewportRuler;
        /** Cached positions of the scrollable parent elements. */
        this.positions = new Map();
    }
    /** Clears the cached positions. */
    clear() {
        this.positions.clear();
    }
    /** Caches the positions. Should be called at the beginning of a drag sequence. */
    cache(elements) {
        this.clear();
        this.positions.set(this._document, {
            scrollPosition: this._viewportRuler.getViewportScrollPosition(),
        });
        elements.forEach(element => {
            this.positions.set(element, {
                scrollPosition: { top: element.scrollTop, left: element.scrollLeft },
                clientRect: getMutableClientRect(element)
            });
        });
    }
    /** Handles scrolling while a drag is taking place. */
    handleScroll(event) {
        const target = _getEventTarget(event);
        const cachedPosition = this.positions.get(target);
        if (!cachedPosition) {
            return null;
        }
        // Used when figuring out whether an element is inside the scroll parent. If the scrolled
        // parent is the `document`, we use the `documentElement`, because IE doesn't support
        // `contains` on the `document`.
        const scrolledParentNode = target === this._document ? target.documentElement : target;
        const scrollPosition = cachedPosition.scrollPosition;
        let newTop;
        let newLeft;
        if (target === this._document) {
            const viewportScrollPosition = this._viewportRuler.getViewportScrollPosition();
            newTop = viewportScrollPosition.top;
            newLeft = viewportScrollPosition.left;
        }
        else {
            newTop = target.scrollTop;
            newLeft = target.scrollLeft;
        }
        const topDifference = scrollPosition.top - newTop;
        const leftDifference = scrollPosition.left - newLeft;
        // Go through and update the cached positions of the scroll
        // parents that are inside the element that was scrolled.
        this.positions.forEach((position, node) => {
            if (position.clientRect && target !== node && scrolledParentNode.contains(node)) {
                adjustClientRect(position.clientRect, topDifference, leftDifference);
            }
        });
        scrollPosition.top = newTop;
        scrollPosition.left = newLeft;
        return { top: topDifference, left: leftDifference };
    }
}
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