source: trip-planner-front/node_modules/@angular/cdk/esm2015/drag-drop/drop-list-ref.js@ ceaed42

/**
 * @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 { coerceElement } from '@angular/cdk/coercion';
import { _getShadowRoot } from '@angular/cdk/platform';
import { Subject, Subscription, interval, animationFrameScheduler } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { moveItemInArray } from './drag-utils';
import { isPointerNearClientRect, adjustClientRect, getMutableClientRect, isInsideClientRect, } from './client-rect';
import { ParentPositionTracker } from './parent-position-tracker';
import { combineTransforms } from './drag-styling';
/**
 * Proximity, as a ratio to width/height, at which a
 * dragged item will affect the drop container.
 */
const DROP_PROXIMITY_THRESHOLD = 0.05;
/**
 * Proximity, as a ratio to width/height at which to start auto-scrolling the drop list or the
 * viewport. The value comes from trying it out manually until it feels right.
 */
const SCROLL_PROXIMITY_THRESHOLD = 0.05;
/**
 * Reference to a drop list. Used to manipulate or dispose of the container.
 */
export class DropListRef {
    constructor(element, _dragDropRegistry, _document, _ngZone, _viewportRuler) {
        this._dragDropRegistry = _dragDropRegistry;
        this._ngZone = _ngZone;
        this._viewportRuler = _viewportRuler;
        /** Whether starting a dragging sequence from this container is disabled. */
        this.disabled = false;
        /** Whether sorting items within the list is disabled. */
        this.sortingDisabled = false;
        /**
         * Whether auto-scrolling the view when the user
         * moves their pointer close to the edges is disabled.
         */
        this.autoScrollDisabled = false;
        /** Number of pixels to scroll for each frame when auto-scrolling an element. */
        this.autoScrollStep = 2;
        /**
         * Function that is used to determine whether an item
         * is allowed to be moved into a drop container.
         */
        this.enterPredicate = () => true;
        /** Functions that is used to determine whether an item can be sorted into a particular index. */
        this.sortPredicate = () => true;
        /** Emits right before dragging has started. */
        this.beforeStarted = new Subject();
        /**
         * Emits when the user has moved a new drag item into this container.
         */
        this.entered = new Subject();
        /**
         * Emits when the user removes an item from the container
         * by dragging it into another container.
         */
        this.exited = new Subject();
        /** Emits when the user drops an item inside the container. */
        this.dropped = new Subject();
        /** Emits as the user is swapping items while actively dragging. */
        this.sorted = new Subject();
        /** Whether an item in the list is being dragged. */
        this._isDragging = false;
        /** Cache of the dimensions of all the items inside the container. */
        this._itemPositions = [];
        /**
         * Keeps track of the item that was last swapped with the dragged item, as well as what direction
         * the pointer was moving in when the swap occured and whether the user's pointer continued to
         * overlap with the swapped item after the swapping occurred.
         */
        this._previousSwap = { drag: null, delta: 0, overlaps: false };
        /** Draggable items in the container. */
        this._draggables = [];
        /** Drop lists that are connected to the current one. */
        this._siblings = [];
        /** Direction in which the list is oriented. */
        this._orientation = 'vertical';
        /** Connected siblings that currently have a dragged item. */
        this._activeSiblings = new Set();
        /** Layout direction of the drop list. */
        this._direction = 'ltr';
        /** Subscription to the window being scrolled. */
        this._viewportScrollSubscription = Subscription.EMPTY;
        /** Vertical direction in which the list is currently scrolling. */
        this._verticalScrollDirection = 0 /* NONE */;
        /** Horizontal direction in which the list is currently scrolling. */
        this._horizontalScrollDirection = 0 /* NONE */;
        /** Used to signal to the current auto-scroll sequence when to stop. */
        this._stopScrollTimers = new Subject();
        /** Shadow root of the current element. Necessary for `elementFromPoint` to resolve correctly. */
        this._cachedShadowRoot = null;
        /** Starts the interval that'll auto-scroll the element. */
        this._startScrollInterval = () => {
            this._stopScrolling();
            interval(0, animationFrameScheduler)
                .pipe(takeUntil(this._stopScrollTimers))
                .subscribe(() => {
                const node = this._scrollNode;
                const scrollStep = this.autoScrollStep;
                if (this._verticalScrollDirection === 1 /* UP */) {
                    incrementVerticalScroll(node, -scrollStep);
                }
                else if (this._verticalScrollDirection === 2 /* DOWN */) {
                    incrementVerticalScroll(node, scrollStep);
                }
                if (this._horizontalScrollDirection === 1 /* LEFT */) {
                    incrementHorizontalScroll(node, -scrollStep);
                }
                else if (this._horizontalScrollDirection === 2 /* RIGHT */) {
                    incrementHorizontalScroll(node, scrollStep);
                }
            });
        };
        this.element = coerceElement(element);
        this._document = _document;
        this.withScrollableParents([this.element]);
        _dragDropRegistry.registerDropContainer(this);
        this._parentPositions = new ParentPositionTracker(_document, _viewportRuler);
    }
    /** Removes the drop list functionality from the DOM element. */
    dispose() {
        this._stopScrolling();
        this._stopScrollTimers.complete();
        this._viewportScrollSubscription.unsubscribe();
        this.beforeStarted.complete();
        this.entered.complete();
        this.exited.complete();
        this.dropped.complete();
        this.sorted.complete();
        this._activeSiblings.clear();
        this._scrollNode = null;
        this._parentPositions.clear();
        this._dragDropRegistry.removeDropContainer(this);
    }
    /** Whether an item from this list is currently being dragged. */
    isDragging() {
        return this._isDragging;
    }
    /** Starts dragging an item. */
    start() {
        this._draggingStarted();
        this._notifyReceivingSiblings();
    }
    /**
     * Emits an event to indicate that the user moved an item into the container.
     * @param item Item that was moved into the container.
     * @param pointerX Position of the item along the X axis.
     * @param pointerY Position of the item along the Y axis.
     * @param index Index at which the item entered. If omitted, the container will try to figure it
     *   out automatically.
     */
    enter(item, pointerX, pointerY, index) {
        this._draggingStarted();
        // If sorting is disabled, we want the item to return to its starting
        // position if the user is returning it to its initial container.
        let newIndex;
        if (index == null) {
            newIndex = this.sortingDisabled ? this._draggables.indexOf(item) : -1;
            if (newIndex === -1) {
                // We use the coordinates of where the item entered the drop
                // zone to figure out at which index it should be inserted.
                newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY);
            }
        }
        else {
            newIndex = index;
        }
        const activeDraggables = this._activeDraggables;
        const currentIndex = activeDraggables.indexOf(item);
        const placeholder = item.getPlaceholderElement();
        let newPositionReference = activeDraggables[newIndex];
        // If the item at the new position is the same as the item that is being dragged,
        // it means that we're trying to restore the item to its initial position. In this
        // case we should use the next item from the list as the reference.
        if (newPositionReference === item) {
            newPositionReference = activeDraggables[newIndex + 1];
        }
        // Since the item may be in the `activeDraggables` already (e.g. if the user dragged it
        // into another container and back again), we have to ensure that it isn't duplicated.
        if (currentIndex > -1) {
            activeDraggables.splice(currentIndex, 1);
        }
        // Don't use items that are being dragged as a reference, because
        // their element has been moved down to the bottom of the body.
        if (newPositionReference && !this._dragDropRegistry.isDragging(newPositionReference)) {
            const element = newPositionReference.getRootElement();
            element.parentElement.insertBefore(placeholder, element);
            activeDraggables.splice(newIndex, 0, item);
        }
        else if (this._shouldEnterAsFirstChild(pointerX, pointerY)) {
            const reference = activeDraggables[0].getRootElement();
            reference.parentNode.insertBefore(placeholder, reference);
            activeDraggables.unshift(item);
        }
        else {
            coerceElement(this.element).appendChild(placeholder);
            activeDraggables.push(item);
        }
        // The transform needs to be cleared so it doesn't throw off the measurements.
        placeholder.style.transform = '';
        // Note that the positions were already cached when we called `start` above,
        // but we need to refresh them since the amount of items has changed and also parent rects.
        this._cacheItemPositions();
        this._cacheParentPositions();
        // Notify siblings at the end so that the item has been inserted into the `activeDraggables`.
        this._notifyReceivingSiblings();
        this.entered.next({ item, container: this, currentIndex: this.getItemIndex(item) });
    }
    /**
     * Removes an item from the container after it was dragged into another container by the user.
     * @param item Item that was dragged out.
     */
    exit(item) {
        this._reset();
        this.exited.next({ item, container: this });
    }
    /**
     * Drops an item into this container.
     * @param item Item being dropped into the container.
     * @param currentIndex Index at which the item should be inserted.
     * @param previousIndex Index of the item when dragging started.
     * @param previousContainer Container from which the item got dragged in.
     * @param isPointerOverContainer Whether the user's pointer was over the
     *    container when the item was dropped.
     * @param distance Distance the user has dragged since the start of the dragging sequence.
     */
    drop(item, currentIndex, previousIndex, previousContainer, isPointerOverContainer, distance, dropPoint) {
        this._reset();
        this.dropped.next({
            item,
            currentIndex,
            previousIndex,
            container: this,
            previousContainer,
            isPointerOverContainer,
            distance,
            dropPoint
        });
    }
    /**
     * Sets the draggable items that are a part of this list.
     * @param items Items that are a part of this list.
     */
    withItems(items) {
        const previousItems = this._draggables;
        this._draggables = items;
        items.forEach(item => item._withDropContainer(this));
        if (this.isDragging()) {
            const draggedItems = previousItems.filter(item => item.isDragging());
            // If all of the items being dragged were removed
            // from the list, abort the current drag sequence.
            if (draggedItems.every(item => items.indexOf(item) === -1)) {
                this._reset();
            }
            else {
                this._cacheItems();
            }
        }
        return this;
    }
    /** Sets the layout direction of the drop list. */
    withDirection(direction) {
        this._direction = direction;
        return this;
    }
    /**
     * Sets the containers that are connected to this one. When two or more containers are
     * connected, the user will be allowed to transfer items between them.
     * @param connectedTo Other containers that the current containers should be connected to.
     */
    connectedTo(connectedTo) {
        this._siblings = connectedTo.slice();
        return this;
    }
    /**
     * Sets the orientation of the container.
     * @param orientation New orientation for the container.
     */
    withOrientation(orientation) {
        this._orientation = orientation;
        return this;
    }
    /**
     * Sets which parent elements are can be scrolled while the user is dragging.
     * @param elements Elements that can be scrolled.
     */
    withScrollableParents(elements) {
        const element = coerceElement(this.element);
        // We always allow the current element to be scrollable
        // so we need to ensure that it's in the array.
        this._scrollableElements =
            elements.indexOf(element) === -1 ? [element, ...elements] : elements.slice();
        return this;
    }
    /** Gets the scrollable parents that are registered with this drop container. */
    getScrollableParents() {
        return this._scrollableElements;
    }
    /**
     * Figures out the index of an item in the container.
     * @param item Item whose index should be determined.
     */
    getItemIndex(item) {
        if (!this._isDragging) {
            return this._draggables.indexOf(item);
        }
        // Items are sorted always by top/left in the cache, however they flow differently in RTL.
        // The rest of the logic still stands no matter what orientation we're in, however
        // we need to invert the array when determining the index.
        const items = this._orientation === 'horizontal' && this._direction === 'rtl' ?
            this._itemPositions.slice().reverse() : this._itemPositions;
        return findIndex(items, currentItem => currentItem.drag === item);
    }
    /**
     * Whether the list is able to receive the item that
     * is currently being dragged inside a connected drop list.
     */
    isReceiving() {
        return this._activeSiblings.size > 0;
    }
    /**
     * Sorts an item inside the container based on its position.
     * @param item Item to be sorted.
     * @param pointerX Position of the item along the X axis.
     * @param pointerY Position of the item along the Y axis.
     * @param pointerDelta Direction in which the pointer is moving along each axis.
     */
    _sortItem(item, pointerX, pointerY, pointerDelta) {
        // Don't sort the item if sorting is disabled or it's out of range.
        if (this.sortingDisabled || !this._clientRect ||
            !isPointerNearClientRect(this._clientRect, DROP_PROXIMITY_THRESHOLD, pointerX, pointerY)) {
            return;
        }
        const siblings = this._itemPositions;
        const newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY, pointerDelta);
        if (newIndex === -1 && siblings.length > 0) {
            return;
        }
        const isHorizontal = this._orientation === 'horizontal';
        const currentIndex = findIndex(siblings, currentItem => currentItem.drag === item);
        const siblingAtNewPosition = siblings[newIndex];
        const currentPosition = siblings[currentIndex].clientRect;
        const newPosition = siblingAtNewPosition.clientRect;
        const delta = currentIndex > newIndex ? 1 : -1;
        // How many pixels the item's placeholder should be offset.
        const itemOffset = this._getItemOffsetPx(currentPosition, newPosition, delta);
        // How many pixels all the other items should be offset.
        const siblingOffset = this._getSiblingOffsetPx(currentIndex, siblings, delta);
        // Save the previous order of the items before moving the item to its new index.
        // We use this to check whether an item has been moved as a result of the sorting.
        const oldOrder = siblings.slice();
        // Shuffle the array in place.
        moveItemInArray(siblings, currentIndex, newIndex);
        this.sorted.next({
            previousIndex: currentIndex,
            currentIndex: newIndex,
            container: this,
            item
        });
        siblings.forEach((sibling, index) => {
            // Don't do anything if the position hasn't changed.
            if (oldOrder[index] === sibling) {
                return;
            }
            const isDraggedItem = sibling.drag === item;
            const offset = isDraggedItem ? itemOffset : siblingOffset;
            const elementToOffset = isDraggedItem ? item.getPlaceholderElement() :
                sibling.drag.getRootElement();
            // Update the offset to reflect the new position.
            sibling.offset += offset;
            // Since we're moving the items with a `transform`, we need to adjust their cached
            // client rects to reflect their new position, as well as swap their positions in the cache.
            // Note that we shouldn't use `getBoundingClientRect` here to update the cache, because the
            // elements may be mid-animation which will give us a wrong result.
            if (isHorizontal) {
                // Round the transforms since some browsers will
                // blur the elements, for sub-pixel transforms.
                elementToOffset.style.transform = combineTransforms(`translate3d(${Math.round(sibling.offset)}px, 0, 0)`, sibling.initialTransform);
                adjustClientRect(sibling.clientRect, 0, offset);
            }
            else {
                elementToOffset.style.transform = combineTransforms(`translate3d(0, ${Math.round(sibling.offset)}px, 0)`, sibling.initialTransform);
                adjustClientRect(sibling.clientRect, offset, 0);
            }
        });
        // Note that it's important that we do this after the client rects have been adjusted.
        this._previousSwap.overlaps = isInsideClientRect(newPosition, pointerX, pointerY);
        this._previousSwap.drag = siblingAtNewPosition.drag;
        this._previousSwap.delta = isHorizontal ? pointerDelta.x : pointerDelta.y;
    }
    /**
     * Checks whether the user's pointer is close to the edges of either the
     * viewport or the drop list and starts the auto-scroll sequence.
     * @param pointerX User's pointer position along the x axis.
     * @param pointerY User's pointer position along the y axis.
     */
    _startScrollingIfNecessary(pointerX, pointerY) {
        if (this.autoScrollDisabled) {
            return;
        }
        let scrollNode;
        let verticalScrollDirection = 0 /* NONE */;
        let horizontalScrollDirection = 0 /* NONE */;
        // Check whether we should start scrolling any of the parent containers.
        this._parentPositions.positions.forEach((position, element) => {
            // We have special handling for the `document` below. Also this would be
            // nicer with a  for...of loop, but it requires changing a compiler flag.
            if (element === this._document || !position.clientRect || scrollNode) {
                return;
            }
            if (isPointerNearClientRect(position.clientRect, DROP_PROXIMITY_THRESHOLD, pointerX, pointerY)) {
                [verticalScrollDirection, horizontalScrollDirection] = getElementScrollDirections(element, position.clientRect, pointerX, pointerY);
                if (verticalScrollDirection || horizontalScrollDirection) {
                    scrollNode = element;
                }
            }
        });
        // Otherwise check if we can start scrolling the viewport.
        if (!verticalScrollDirection && !horizontalScrollDirection) {
            const { width, height } = this._viewportRuler.getViewportSize();
            const clientRect = { width, height, top: 0, right: width, bottom: height, left: 0 };
            verticalScrollDirection = getVerticalScrollDirection(clientRect, pointerY);
            horizontalScrollDirection = getHorizontalScrollDirection(clientRect, pointerX);
            scrollNode = window;
        }
        if (scrollNode && (verticalScrollDirection !== this._verticalScrollDirection ||
            horizontalScrollDirection !== this._horizontalScrollDirection ||
            scrollNode !== this._scrollNode)) {
            this._verticalScrollDirection = verticalScrollDirection;
            this._horizontalScrollDirection = horizontalScrollDirection;
            this._scrollNode = scrollNode;
            if ((verticalScrollDirection || horizontalScrollDirection) && scrollNode) {
                this._ngZone.runOutsideAngular(this._startScrollInterval);
            }
            else {
                this._stopScrolling();
            }
        }
    }
    /** Stops any currently-running auto-scroll sequences. */
    _stopScrolling() {
        this._stopScrollTimers.next();
    }
    /** Starts the dragging sequence within the list. */
    _draggingStarted() {
        const styles = coerceElement(this.element).style;
        this.beforeStarted.next();
        this._isDragging = true;
        // We need to disable scroll snapping while the user is dragging, because it breaks automatic
        // scrolling. The browser seems to round the value based on the snapping points which means
        // that we can't increment/decrement the scroll position.
        this._initialScrollSnap = styles.msScrollSnapType || styles.scrollSnapType || '';
        styles.scrollSnapType = styles.msScrollSnapType = 'none';
        this._cacheItems();
        this._viewportScrollSubscription.unsubscribe();
        this._listenToScrollEvents();
    }
    /** Caches the positions of the configured scrollable parents. */
    _cacheParentPositions() {
        const element = coerceElement(this.element);
        this._parentPositions.cache(this._scrollableElements);
        // The list element is always in the `scrollableElements`
        // so we can take advantage of the cached `ClientRect`.
        this._clientRect = this._parentPositions.positions.get(element).clientRect;
    }
    /** Refreshes the position cache of the items and sibling containers. */
    _cacheItemPositions() {
        const isHorizontal = this._orientation === 'horizontal';
        this._itemPositions = this._activeDraggables.map(drag => {
            const elementToMeasure = drag.getVisibleElement();
            return {
                drag,
                offset: 0,
                initialTransform: elementToMeasure.style.transform || '',
                clientRect: getMutableClientRect(elementToMeasure),
            };
        }).sort((a, b) => {
            return isHorizontal ? a.clientRect.left - b.clientRect.left :
                a.clientRect.top - b.clientRect.top;
        });
    }
    /** Resets the container to its initial state. */
    _reset() {
        this._isDragging = false;
        const styles = coerceElement(this.element).style;
        styles.scrollSnapType = styles.msScrollSnapType = this._initialScrollSnap;
        // TODO(crisbeto): may have to wait for the animations to finish.
        this._activeDraggables.forEach(item => {
            var _a;
            const rootElement = item.getRootElement();
            if (rootElement) {
                const initialTransform = (_a = this._itemPositions
                    .find(current => current.drag === item)) === null || _a === void 0 ? void 0 : _a.initialTransform;
                rootElement.style.transform = initialTransform || '';
            }
        });
        this._siblings.forEach(sibling => sibling._stopReceiving(this));
        this._activeDraggables = [];
        this._itemPositions = [];
        this._previousSwap.drag = null;
        this._previousSwap.delta = 0;
        this._previousSwap.overlaps = false;
        this._stopScrolling();
        this._viewportScrollSubscription.unsubscribe();
        this._parentPositions.clear();
    }
    /**
     * Gets the offset in pixels by which the items that aren't being dragged should be moved.
     * @param currentIndex Index of the item currently being dragged.
     * @param siblings All of the items in the list.
     * @param delta Direction in which the user is moving.
     */
    _getSiblingOffsetPx(currentIndex, siblings, delta) {
        const isHorizontal = this._orientation === 'horizontal';
        const currentPosition = siblings[currentIndex].clientRect;
        const immediateSibling = siblings[currentIndex + delta * -1];
        let siblingOffset = currentPosition[isHorizontal ? 'width' : 'height'] * delta;
        if (immediateSibling) {
            const start = isHorizontal ? 'left' : 'top';
            const end = isHorizontal ? 'right' : 'bottom';
            // Get the spacing between the start of the current item and the end of the one immediately
            // after it in the direction in which the user is dragging, or vice versa. We add it to the
            // offset in order to push the element to where it will be when it's inline and is influenced
            // by the `margin` of its siblings.
            if (delta === -1) {
                siblingOffset -= immediateSibling.clientRect[start] - currentPosition[end];
            }
            else {
                siblingOffset += currentPosition[start] - immediateSibling.clientRect[end];
            }
        }
        return siblingOffset;
    }
    /**
     * Gets the offset in pixels by which the item that is being dragged should be moved.
     * @param currentPosition Current position of the item.
     * @param newPosition Position of the item where the current item should be moved.
     * @param delta Direction in which the user is moving.
     */
    _getItemOffsetPx(currentPosition, newPosition, delta) {
        const isHorizontal = this._orientation === 'horizontal';
        let itemOffset = isHorizontal ? newPosition.left - currentPosition.left :
            newPosition.top - currentPosition.top;
        // Account for differences in the item width/height.
        if (delta === -1) {
            itemOffset += isHorizontal ? newPosition.width - currentPosition.width :
                newPosition.height - currentPosition.height;
        }
        return itemOffset;
    }
    /**
     * Checks if pointer is entering in the first position
     * @param pointerX Position of the user's pointer along the X axis.
     * @param pointerY Position of the user's pointer along the Y axis.
     */
    _shouldEnterAsFirstChild(pointerX, pointerY) {
        if (!this._activeDraggables.length) {
            return false;
        }
        const itemPositions = this._itemPositions;
        const isHorizontal = this._orientation === 'horizontal';
        // `itemPositions` are sorted by position while `activeDraggables` are sorted by child index
        // check if container is using some sort of "reverse" ordering (eg: flex-direction: row-reverse)
        const reversed = itemPositions[0].drag !== this._activeDraggables[0];
        if (reversed) {
            const lastItemRect = itemPositions[itemPositions.length - 1].clientRect;
            return isHorizontal ? pointerX >= lastItemRect.right : pointerY >= lastItemRect.bottom;
        }
        else {
            const firstItemRect = itemPositions[0].clientRect;
            return isHorizontal ? pointerX <= firstItemRect.left : pointerY <= firstItemRect.top;
        }
    }
    /**
     * Gets the index of an item in the drop container, based on the position of the user's pointer.
     * @param item Item that is being sorted.
     * @param pointerX Position of the user's pointer along the X axis.
     * @param pointerY Position of the user's pointer along the Y axis.
     * @param delta Direction in which the user is moving their pointer.
     */
    _getItemIndexFromPointerPosition(item, pointerX, pointerY, delta) {
        const isHorizontal = this._orientation === 'horizontal';
        const index = findIndex(this._itemPositions, ({ drag, clientRect }, _, array) => {
            if (drag === item) {
                // If there's only one item left in the container, it must be
                // the dragged item itself so we use it as a reference.
                return array.length < 2;
            }
            if (delta) {
                const direction = isHorizontal ? delta.x : delta.y;
                // If the user is still hovering over the same item as last time, their cursor hasn't left
                // the item after we made the swap, and they didn't change the direction in which they're
                // dragging, we don't consider it a direction swap.
                if (drag === this._previousSwap.drag && this._previousSwap.overlaps &&
                    direction === this._previousSwap.delta) {
                    return false;
                }
            }
            return isHorizontal ?
                // Round these down since most browsers report client rects with
                // sub-pixel precision, whereas the pointer coordinates are rounded to pixels.
                pointerX >= Math.floor(clientRect.left) && pointerX < Math.floor(clientRect.right) :
                pointerY >= Math.floor(clientRect.top) && pointerY < Math.floor(clientRect.bottom);
        });
        return (index === -1 || !this.sortPredicate(index, item, this)) ? -1 : index;
    }
    /** Caches the current items in the list and their positions. */
    _cacheItems() {
        this._activeDraggables = this._draggables.slice();
        this._cacheItemPositions();
        this._cacheParentPositions();
    }
    /**
     * Checks whether the user's pointer is positioned over the container.
     * @param x Pointer position along the X axis.
     * @param y Pointer position along the Y axis.
     */
    _isOverContainer(x, y) {
        return this._clientRect != null && isInsideClientRect(this._clientRect, x, y);
    }
    /**
     * Figures out whether an item should be moved into a sibling
     * drop container, based on its current position.
     * @param item Drag item that is being moved.
     * @param x Position of the item along the X axis.
     * @param y Position of the item along the Y axis.
     */
    _getSiblingContainerFromPosition(item, x, y) {
        return this._siblings.find(sibling => sibling._canReceive(item, x, y));
    }
    /**
     * Checks whether the drop list can receive the passed-in item.
     * @param item Item that is being dragged into the list.
     * @param x Position of the item along the X axis.
     * @param y Position of the item along the Y axis.
     */
    _canReceive(item, x, y) {
        if (!this._clientRect || !isInsideClientRect(this._clientRect, x, y) ||
            !this.enterPredicate(item, this)) {
            return false;
        }
        const elementFromPoint = this._getShadowRoot().elementFromPoint(x, y);
        // If there's no element at the pointer position, then
        // the client rect is probably scrolled out of the view.
        if (!elementFromPoint) {
            return false;
        }
        const nativeElement = coerceElement(this.element);
        // The `ClientRect`, that we're using to find the container over which the user is
        // hovering, doesn't give us any information on whether the element has been scrolled
        // out of the view or whether it's overlapping with other containers. This means that
        // we could end up transferring the item into a container that's invisible or is positioned
        // below another one. We use the result from `elementFromPoint` to get the top-most element
        // at the pointer position and to find whether it's one of the intersecting drop containers.
        return elementFromPoint === nativeElement || nativeElement.contains(elementFromPoint);
    }
    /**
     * Called by one of the connected drop lists when a dragging sequence has started.
     * @param sibling Sibling in which dragging has started.
     */
    _startReceiving(sibling, items) {
        const activeSiblings = this._activeSiblings;
        if (!activeSiblings.has(sibling) && items.every(item => {
            // Note that we have to add an exception to the `enterPredicate` for items that started off
            // in this drop list. The drag ref has logic that allows an item to return to its initial
            // container, if it has left the initial container and none of the connected containers
            // allow it to enter. See `DragRef._updateActiveDropContainer` for more context.
            return this.enterPredicate(item, this) || this._draggables.indexOf(item) > -1;
        })) {
            activeSiblings.add(sibling);
            this._cacheParentPositions();
            this._listenToScrollEvents();
        }
    }
    /**
     * Called by a connected drop list when dragging has stopped.
     * @param sibling Sibling whose dragging has stopped.
     */
    _stopReceiving(sibling) {
        this._activeSiblings.delete(sibling);
        this._viewportScrollSubscription.unsubscribe();
    }
    /**
     * Starts listening to scroll events on the viewport.
     * Used for updating the internal state of the list.
     */
    _listenToScrollEvents() {
        this._viewportScrollSubscription = this._dragDropRegistry
            .scrolled(this._getShadowRoot())
            .subscribe(event => {
            if (this.isDragging()) {
                const scrollDifference = this._parentPositions.handleScroll(event);
                if (scrollDifference) {
                    // Since we know the amount that the user has scrolled we can shift all of the
                    // client rectangles ourselves. This is cheaper than re-measuring everything and
                    // we can avoid inconsistent behavior where we might be measuring the element before
                    // its position has changed.
                    this._itemPositions.forEach(({ clientRect }) => {
                        adjustClientRect(clientRect, scrollDifference.top, scrollDifference.left);
                    });
                    // We need two loops for this, because we want all of the cached
                    // positions to be up-to-date before we re-sort the item.
                    this._itemPositions.forEach(({ drag }) => {
                        if (this._dragDropRegistry.isDragging(drag)) {
                            // We need to re-sort the item manually, because the pointer move
                            // events won't be dispatched while the user is scrolling.
                            drag._sortFromLastPointerPosition();
                        }
                    });
                }
            }
            else if (this.isReceiving()) {
                this._cacheParentPositions();
            }
        });
    }
    /**
     * Lazily resolves and returns the shadow root of the element. We do this in a function, rather
     * than saving it in property directly on init, because we want to resolve it as late as possible
     * in order to ensure that the element has been moved into the shadow DOM. Doing it inside the
     * constructor might be too early if the element is inside of something like `ngFor` or `ngIf`.
     */
    _getShadowRoot() {
        if (!this._cachedShadowRoot) {
            const shadowRoot = _getShadowRoot(coerceElement(this.element));
            this._cachedShadowRoot = shadowRoot || this._document;
        }
        return this._cachedShadowRoot;
    }
    /** Notifies any siblings that may potentially receive the item. */
    _notifyReceivingSiblings() {
        const draggedItems = this._activeDraggables.filter(item => item.isDragging());
        this._siblings.forEach(sibling => sibling._startReceiving(this, draggedItems));
    }
}
/**
 * Finds the index of an item that matches a predicate function. Used as an equivalent
 * of `Array.prototype.findIndex` which isn't part of the standard Google typings.
 * @param array Array in which to look for matches.
 * @param predicate Function used to determine whether an item is a match.
 */
function findIndex(array, predicate) {
    for (let i = 0; i < array.length; i++) {
        if (predicate(array[i], i, array)) {
            return i;
        }
    }
    return -1;
}
/**
 * Increments the vertical scroll position of a node.
 * @param node Node whose scroll position should change.
 * @param amount Amount of pixels that the `node` should be scrolled.
 */
function incrementVerticalScroll(node, amount) {
    if (node === window) {
        node.scrollBy(0, amount);
    }
    else {
        // Ideally we could use `Element.scrollBy` here as well, but IE and Edge don't support it.
        node.scrollTop += amount;
    }
}
/**
 * Increments the horizontal scroll position of a node.
 * @param node Node whose scroll position should change.
 * @param amount Amount of pixels that the `node` should be scrolled.
 */
function incrementHorizontalScroll(node, amount) {
    if (node === window) {
        node.scrollBy(amount, 0);
    }
    else {
        // Ideally we could use `Element.scrollBy` here as well, but IE and Edge don't support it.
        node.scrollLeft += amount;
    }
}
/**
 * Gets whether the vertical auto-scroll direction of a node.
 * @param clientRect Dimensions of the node.
 * @param pointerY Position of the user's pointer along the y axis.
 */
function getVerticalScrollDirection(clientRect, pointerY) {
    const { top, bottom, height } = clientRect;
    const yThreshold = height * SCROLL_PROXIMITY_THRESHOLD;
    if (pointerY >= top - yThreshold && pointerY <= top + yThreshold) {
        return 1 /* UP */;
    }
    else if (pointerY >= bottom - yThreshold && pointerY <= bottom + yThreshold) {
        return 2 /* DOWN */;
    }
    return 0 /* NONE */;
}
/**
 * Gets whether the horizontal auto-scroll direction of a node.
 * @param clientRect Dimensions of the node.
 * @param pointerX Position of the user's pointer along the x axis.
 */
function getHorizontalScrollDirection(clientRect, pointerX) {
    const { left, right, width } = clientRect;
    const xThreshold = width * SCROLL_PROXIMITY_THRESHOLD;
    if (pointerX >= left - xThreshold && pointerX <= left + xThreshold) {
        return 1 /* LEFT */;
    }
    else if (pointerX >= right - xThreshold && pointerX <= right + xThreshold) {
        return 2 /* RIGHT */;
    }
    return 0 /* NONE */;
}
/**
 * Gets the directions in which an element node should be scrolled,
 * assuming that the user's pointer is already within it scrollable region.
 * @param element Element for which we should calculate the scroll direction.
 * @param clientRect Bounding client rectangle of the element.
 * @param pointerX Position of the user's pointer along the x axis.
 * @param pointerY Position of the user's pointer along the y axis.
 */
function getElementScrollDirections(element, clientRect, pointerX, pointerY) {
    const computedVertical = getVerticalScrollDirection(clientRect, pointerY);
    const computedHorizontal = getHorizontalScrollDirection(clientRect, pointerX);
    let verticalScrollDirection = 0 /* NONE */;
    let horizontalScrollDirection = 0 /* NONE */;
    // Note that we here we do some extra checks for whether the element is actually scrollable in
    // a certain direction and we only assign the scroll direction if it is. We do this so that we
    // can allow other elements to be scrolled, if the current element can't be scrolled anymore.
    // This allows us to handle cases where the scroll regions of two scrollable elements overlap.
    if (computedVertical) {
        const scrollTop = element.scrollTop;
        if (computedVertical === 1 /* UP */) {
            if (scrollTop > 0) {
                verticalScrollDirection = 1 /* UP */;
            }
        }
        else if (element.scrollHeight - scrollTop > element.clientHeight) {
            verticalScrollDirection = 2 /* DOWN */;
        }
    }
    if (computedHorizontal) {
        const scrollLeft = element.scrollLeft;
        if (computedHorizontal === 1 /* LEFT */) {
            if (scrollLeft > 0) {
                horizontalScrollDirection = 1 /* LEFT */;
            }
        }
        else if (element.scrollWidth - scrollLeft > element.clientWidth) {
            horizontalScrollDirection = 2 /* RIGHT */;
        }
    }
    return [verticalScrollDirection, horizontalScrollDirection];
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ElementRef, NgZone} from '@angular/core';\nimport {Direction} from '@angular/cdk/bidi';\nimport {coerceElement} from '@angular/cdk/coercion';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {_getShadowRoot} from '@angular/cdk/platform';\nimport {Subject, Subscription, interval, animationFrameScheduler} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {moveItemInArray} from './drag-utils';\nimport {DragDropRegistry} from './drag-drop-registry';\nimport {DragRefInternal as DragRef, Point} from './drag-ref';\nimport {\n  isPointerNearClientRect,\n  adjustClientRect,\n  getMutableClientRect,\n  isInsideClientRect,\n} from './client-rect';\nimport {ParentPositionTracker} from './parent-position-tracker';\nimport {combineTransforms, DragCSSStyleDeclaration} from './drag-styling';\n\n/**\n * Proximity, as a ratio to width/height, at which a\n * dragged item will affect the drop container.\n */\nconst DROP_PROXIMITY_THRESHOLD = 0.05;\n\n/**\n * Proximity, as a ratio to width/height at which to start auto-scrolling the drop list or the\n * viewport. The value comes from trying it out manually until it feels right.\n */\nconst SCROLL_PROXIMITY_THRESHOLD = 0.05;\n\n/**\n * Entry in the position cache for draggable items.\n * @docs-private\n */\ninterface CachedItemPosition {\n  /** Instance of the drag item. */\n  drag: DragRef;\n  /** Dimensions of the item. */\n  clientRect: ClientRect;\n  /** Amount by which the item has been moved since dragging started. */\n  offset: number;\n  /** Inline transform that the drag item had when dragging started. */\n  initialTransform: string;\n}\n\n/** Vertical direction in which we can auto-scroll. */\nconst enum AutoScrollVerticalDirection {NONE, UP, DOWN}\n\n/** Horizontal direction in which we can auto-scroll. */\nconst enum AutoScrollHorizontalDirection {NONE, LEFT, RIGHT}\n\n/**\n * Internal compile-time-only representation of a `DropListRef`.\n * Used to avoid circular import issues between the `DropListRef` and the `DragRef`.\n * @docs-private\n */\nexport interface DropListRefInternal extends DropListRef {}\n\n/**\n * Reference to a drop list. Used to manipulate or dispose of the container.\n */\nexport class DropListRef<T = any> {\n  /** Element that the drop list is attached to. */\n  element: HTMLElement | ElementRef<HTMLElement>;\n\n  /** Whether starting a dragging sequence from this container is disabled. */\n  disabled: boolean = false;\n\n  /** Whether sorting items within the list is disabled. */\n  sortingDisabled: boolean = false;\n\n  /** Locks the position of the draggable elements inside the container along the specified axis. */\n  lockAxis: 'x' | 'y';\n\n  /**\n   * Whether auto-scrolling the view when the user\n   * moves their pointer close to the edges is disabled.\n   */\n  autoScrollDisabled: boolean = false;\n\n  /** Number of pixels to scroll for each frame when auto-scrolling an element. */\n  autoScrollStep: number = 2;\n\n  /**\n   * Function that is used to determine whether an item\n   * is allowed to be moved into a drop container.\n   */\n  enterPredicate: (drag: DragRef, drop: DropListRef) => boolean = () => true;\n\n  /** Functions that is used to determine whether an item can be sorted into a particular index. */\n  sortPredicate: (index: number, drag: DragRef, drop: DropListRef) => boolean = () => true;\n\n  /** Emits right before dragging has started. */\n  readonly beforeStarted = new Subject<void>();\n\n  /**\n   * Emits when the user has moved a new drag item into this container.\n   */\n  readonly entered = new Subject<{item: DragRef, container: DropListRef, currentIndex: number}>();\n\n  /**\n   * Emits when the user removes an item from the container\n   * by dragging it into another container.\n   */\n  readonly exited = new Subject<{item: DragRef, container: DropListRef}>();\n\n  /** Emits when the user drops an item inside the container. */\n  readonly dropped = new Subject<{\n    item: DragRef,\n    currentIndex: number,\n    previousIndex: number,\n    container: DropListRef,\n    previousContainer: DropListRef,\n    isPointerOverContainer: boolean,\n    distance: Point;\n    dropPoint: Point;\n  }>();\n\n  /** Emits as the user is swapping items while actively dragging. */\n  readonly sorted = new Subject<{\n    previousIndex: number,\n    currentIndex: number,\n    container: DropListRef,\n    item: DragRef\n  }>();\n\n  /** Arbitrary data that can be attached to the drop list. */\n  data: T;\n\n  /** Whether an item in the list is being dragged. */\n  private _isDragging = false;\n\n  /** Cache of the dimensions of all the items inside the container. */\n  private _itemPositions: CachedItemPosition[] = [];\n\n  /** Keeps track of the positions of any parent scrollable elements. */\n  private _parentPositions: ParentPositionTracker;\n\n  /** Cached `ClientRect` of the drop list. */\n  private _clientRect: ClientRect | undefined;\n\n  /**\n   * Draggable items that are currently active inside the container. Includes the items\n   * from `_draggables`, as well as any items that have been dragged in, but haven't\n   * been dropped yet.\n   */\n  private _activeDraggables: DragRef[];\n\n  /**\n   * Keeps track of the item that was last swapped with the dragged item, as well as what direction\n   * the pointer was moving in when the swap occured and whether the user's pointer continued to\n   * overlap with the swapped item after the swapping occurred.\n   */\n  private _previousSwap = {drag: null as DragRef | null, delta: 0, overlaps: false};\n\n  /** Draggable items in the container. */\n  private _draggables: readonly DragRef[] = [];\n\n  /** Drop lists that are connected to the current one. */\n  private _siblings: readonly DropListRef[] = [];\n\n  /** Direction in which the list is oriented. */\n  private _orientation: 'horizontal' | 'vertical' = 'vertical';\n\n  /** Connected siblings that currently have a dragged item. */\n  private _activeSiblings = new Set<DropListRef>();\n\n  /** Layout direction of the drop list. */\n  private _direction: Direction = 'ltr';\n\n  /** Subscription to the window being scrolled. */\n  private _viewportScrollSubscription = Subscription.EMPTY;\n\n  /** Vertical direction in which the list is currently scrolling. */\n  private _verticalScrollDirection = AutoScrollVerticalDirection.NONE;\n\n  /** Horizontal direction in which the list is currently scrolling. */\n  private _horizontalScrollDirection = AutoScrollHorizontalDirection.NONE;\n\n  /** Node that is being auto-scrolled. */\n  private _scrollNode: HTMLElement | Window;\n\n  /** Used to signal to the current auto-scroll sequence when to stop. */\n  private readonly _stopScrollTimers = new Subject<void>();\n\n  /** Shadow root of the current element. Necessary for `elementFromPoint` to resolve correctly. */\n  private _cachedShadowRoot: DocumentOrShadowRoot | null = null;\n\n  /** Reference to the document. */\n  private _document: Document;\n\n  /** Elements that can be scrolled while the user is dragging. */\n  private _scrollableElements: HTMLElement[];\n\n  /** Initial value for the element's `scroll-snap-type` style. */\n  private _initialScrollSnap: string;\n\n  constructor(\n    element: ElementRef<HTMLElement> | HTMLElement,\n    private _dragDropRegistry: DragDropRegistry<DragRef, DropListRef>,\n    _document: any,\n    private _ngZone: NgZone,\n    private _viewportRuler: ViewportRuler) {\n    this.element = coerceElement(element);\n    this._document = _document;\n    this.withScrollableParents([this.element]);\n    _dragDropRegistry.registerDropContainer(this);\n    this._parentPositions = new ParentPositionTracker(_document, _viewportRuler);\n  }\n\n  /** Removes the drop list functionality from the DOM element. */\n  dispose() {\n    this._stopScrolling();\n    this._stopScrollTimers.complete();\n    this._viewportScrollSubscription.unsubscribe();\n    this.beforeStarted.complete();\n    this.entered.complete();\n    this.exited.complete();\n    this.dropped.complete();\n    this.sorted.complete();\n    this._activeSiblings.clear();\n    this._scrollNode = null!;\n    this._parentPositions.clear();\n    this._dragDropRegistry.removeDropContainer(this);\n  }\n\n  /** Whether an item from this list is currently being dragged. */\n  isDragging() {\n    return this._isDragging;\n  }\n\n  /** Starts dragging an item. */\n  start(): void {\n    this._draggingStarted();\n    this._notifyReceivingSiblings();\n  }\n\n  /**\n   * Emits an event to indicate that the user moved an item into the container.\n   * @param item Item that was moved into the container.\n   * @param pointerX Position of the item along the X axis.\n   * @param pointerY Position of the item along the Y axis.\n   * @param index Index at which the item entered. If omitted, the container will try to figure it\n   *   out automatically.\n   */\n  enter(item: DragRef, pointerX: number, pointerY: number, index?: number): void {\n    this._draggingStarted();\n\n    // If sorting is disabled, we want the item to return to its starting\n    // position if the user is returning it to its initial container.\n    let newIndex: number;\n\n    if (index == null) {\n      newIndex = this.sortingDisabled ? this._draggables.indexOf(item) : -1;\n\n      if (newIndex === -1) {\n        // We use the coordinates of where the item entered the drop\n        // zone to figure out at which index it should be inserted.\n        newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY);\n      }\n    } else {\n      newIndex = index;\n    }\n\n    const activeDraggables = this._activeDraggables;\n    const currentIndex = activeDraggables.indexOf(item);\n    const placeholder = item.getPlaceholderElement();\n    let newPositionReference: DragRef | undefined = activeDraggables[newIndex];\n\n    // If the item at the new position is the same as the item that is being dragged,\n    // it means that we're trying to restore the item to its initial position. In this\n    // case we should use the next item from the list as the reference.\n    if (newPositionReference === item) {\n      newPositionReference = activeDraggables[newIndex + 1];\n    }\n\n    // Since the item may be in the `activeDraggables` already (e.g. if the user dragged it\n    // into another container and back again), we have to ensure that it isn't duplicated.\n    if (currentIndex > -1) {\n      activeDraggables.splice(currentIndex, 1);\n    }\n\n    // Don't use items that are being dragged as a reference, because\n    // their element has been moved down to the bottom of the body.\n    if (newPositionReference && !this._dragDropRegistry.isDragging(newPositionReference)) {\n      const element = newPositionReference.getRootElement();\n      element.parentElement!.insertBefore(placeholder, element);\n      activeDraggables.splice(newIndex, 0, item);\n    } else if (this._shouldEnterAsFirstChild(pointerX, pointerY)) {\n      const reference = activeDraggables[0].getRootElement();\n      reference.parentNode!.insertBefore(placeholder, reference);\n      activeDraggables.unshift(item);\n    } else {\n      coerceElement(this.element).appendChild(placeholder);\n      activeDraggables.push(item);\n    }\n\n    // The transform needs to be cleared so it doesn't throw off the measurements.\n    placeholder.style.transform = '';\n\n    // Note that the positions were already cached when we called `start` above,\n    // but we need to refresh them since the amount of items has changed and also parent rects.\n    this._cacheItemPositions();\n    this._cacheParentPositions();\n\n    // Notify siblings at the end so that the item has been inserted into the `activeDraggables`.\n    this._notifyReceivingSiblings();\n    this.entered.next({item, container: this, currentIndex: this.getItemIndex(item)});\n  }\n\n  /**\n   * Removes an item from the container after it was dragged into another container by the user.\n   * @param item Item that was dragged out.\n   */\n  exit(item: DragRef): void {\n    this._reset();\n    this.exited.next({item, container: this});\n  }\n\n  /**\n   * Drops an item into this container.\n   * @param item Item being dropped into the container.\n   * @param currentIndex Index at which the item should be inserted.\n   * @param previousIndex Index of the item when dragging started.\n   * @param previousContainer Container from which the item got dragged in.\n   * @param isPointerOverContainer Whether the user's pointer was over the\n   *    container when the item was dropped.\n   * @param distance Distance the user has dragged since the start of the dragging sequence.\n   */\n  drop(item: DragRef, currentIndex: number, previousIndex: number, previousContainer: DropListRef,\n    isPointerOverContainer: boolean, distance: Point, dropPoint: Point): void {\n    this._reset();\n    this.dropped.next({\n      item,\n      currentIndex,\n      previousIndex,\n      container: this,\n      previousContainer,\n      isPointerOverContainer,\n      distance,\n      dropPoint\n    });\n  }\n\n  /**\n   * Sets the draggable items that are a part of this list.\n   * @param items Items that are a part of this list.\n   */\n  withItems(items: DragRef[]): this {\n    const previousItems = this._draggables;\n    this._draggables = items;\n    items.forEach(item => item._withDropContainer(this));\n\n    if (this.isDragging()) {\n      const draggedItems = previousItems.filter(item => item.isDragging());\n\n      // If all of the items being dragged were removed\n      // from the list, abort the current drag sequence.\n      if (draggedItems.every(item => items.indexOf(item) === -1)) {\n        this._reset();\n      } else {\n        this._cacheItems();\n      }\n    }\n\n    return this;\n  }\n\n  /** Sets the layout direction of the drop list. */\n  withDirection(direction: Direction): this {\n    this._direction = direction;\n    return this;\n  }\n\n  /**\n   * Sets the containers that are connected to this one. When two or more containers are\n   * connected, the user will be allowed to transfer items between them.\n   * @param connectedTo Other containers that the current containers should be connected to.\n   */\n  connectedTo(connectedTo: DropListRef[]): this {\n    this._siblings = connectedTo.slice();\n    return this;\n  }\n\n  /**\n   * Sets the orientation of the container.\n   * @param orientation New orientation for the container.\n   */\n  withOrientation(orientation: 'vertical' | 'horizontal'): this {\n    this._orientation = orientation;\n    return this;\n  }\n\n  /**\n   * Sets which parent elements are can be scrolled while the user is dragging.\n   * @param elements Elements that can be scrolled.\n   */\n  withScrollableParents(elements: HTMLElement[]): this {\n    const element = coerceElement(this.element);\n\n    // We always allow the current element to be scrollable\n    // so we need to ensure that it's in the array.\n    this._scrollableElements =\n        elements.indexOf(element) === -1 ? [element, ...elements] : elements.slice();\n    return this;\n  }\n\n  /** Gets the scrollable parents that are registered with this drop container. */\n  getScrollableParents(): readonly HTMLElement[] {\n    return this._scrollableElements;\n  }\n\n  /**\n   * Figures out the index of an item in the container.\n   * @param item Item whose index should be determined.\n   */\n  getItemIndex(item: DragRef): number {\n    if (!this._isDragging) {\n      return this._draggables.indexOf(item);\n    }\n\n    // Items are sorted always by top/left in the cache, however they flow differently in RTL.\n    // The rest of the logic still stands no matter what orientation we're in, however\n    // we need to invert the array when determining the index.\n    const items = this._orientation === 'horizontal' && this._direction === 'rtl' ?\n        this._itemPositions.slice().reverse() : this._itemPositions;\n\n    return findIndex(items, currentItem => currentItem.drag === item);\n  }\n\n  /**\n   * Whether the list is able to receive the item that\n   * is currently being dragged inside a connected drop list.\n   */\n  isReceiving(): boolean {\n    return this._activeSiblings.size > 0;\n  }\n\n  /**\n   * Sorts an item inside the container based on its position.\n   * @param item Item to be sorted.\n   * @param pointerX Position of the item along the X axis.\n   * @param pointerY Position of the item along the Y axis.\n   * @param pointerDelta Direction in which the pointer is moving along each axis.\n   */\n  _sortItem(item: DragRef, pointerX: number, pointerY: number,\n            pointerDelta: {x: number, y: number}): void {\n    // Don't sort the item if sorting is disabled or it's out of range.\n    if (this.sortingDisabled || !this._clientRect ||\n        !isPointerNearClientRect(this._clientRect, DROP_PROXIMITY_THRESHOLD, pointerX, pointerY)) {\n      return;\n    }\n\n    const siblings = this._itemPositions;\n    const newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY, pointerDelta);\n\n    if (newIndex === -1 && siblings.length > 0) {\n      return;\n    }\n\n    const isHorizontal = this._orientation === 'horizontal';\n    const currentIndex = findIndex(siblings, currentItem => currentItem.drag === item);\n    const siblingAtNewPosition = siblings[newIndex];\n    const currentPosition = siblings[currentIndex].clientRect;\n    const newPosition = siblingAtNewPosition.clientRect;\n    const delta = currentIndex > newIndex ? 1 : -1;\n\n    // How many pixels the item's placeholder should be offset.\n    const itemOffset = this._getItemOffsetPx(currentPosition, newPosition, delta);\n\n    // How many pixels all the other items should be offset.\n    const siblingOffset = this._getSiblingOffsetPx(currentIndex, siblings, delta);\n\n    // Save the previous order of the items before moving the item to its new index.\n    // We use this to check whether an item has been moved as a result of the sorting.\n    const oldOrder = siblings.slice();\n\n    // Shuffle the array in place.\n    moveItemInArray(siblings, currentIndex, newIndex);\n\n    this.sorted.next({\n      previousIndex: currentIndex,\n      currentIndex: newIndex,\n      container: this,\n      item\n    });\n\n    siblings.forEach((sibling, index) => {\n      // Don't do anything if the position hasn't changed.\n      if (oldOrder[index] === sibling) {\n        return;\n      }\n\n      const isDraggedItem = sibling.drag === item;\n      const offset = isDraggedItem ? itemOffset : siblingOffset;\n      const elementToOffset = isDraggedItem ? item.getPlaceholderElement() :\n                                              sibling.drag.getRootElement();\n\n      // Update the offset to reflect the new position.\n      sibling.offset += offset;\n\n      // Since we're moving the items with a `transform`, we need to adjust their cached\n      // client rects to reflect their new position, as well as swap their positions in the cache.\n      // Note that we shouldn't use `getBoundingClientRect` here to update the cache, because the\n      // elements may be mid-animation which will give us a wrong result.\n      if (isHorizontal) {\n        // Round the transforms since some browsers will\n        // blur the elements, for sub-pixel transforms.\n        elementToOffset.style.transform = combineTransforms(\n          `translate3d(${Math.round(sibling.offset)}px, 0, 0)`, sibling.initialTransform);\n        adjustClientRect(sibling.clientRect, 0, offset);\n      } else {\n        elementToOffset.style.transform = combineTransforms(\n          `translate3d(0, ${Math.round(sibling.offset)}px, 0)`, sibling.initialTransform);\n        adjustClientRect(sibling.clientRect, offset, 0);\n      }\n    });\n\n    // Note that it's important that we do this after the client rects have been adjusted.\n    this._previousSwap.overlaps = isInsideClientRect(newPosition, pointerX, pointerY);\n    this._previousSwap.drag = siblingAtNewPosition.drag;\n    this._previousSwap.delta = isHorizontal ? pointerDelta.x : pointerDelta.y;\n  }\n\n  /**\n   * Checks whether the user's pointer is close to the edges of either the\n   * viewport or the drop list and starts the auto-scroll sequence.\n   * @param pointerX User's pointer position along the x axis.\n   * @param pointerY User's pointer position along the y axis.\n   */\n  _startScrollingIfNecessary(pointerX: number, pointerY: number) {\n    if (this.autoScrollDisabled) {\n      return;\n    }\n\n    let scrollNode: HTMLElement | Window | undefined;\n    let verticalScrollDirection = AutoScrollVerticalDirection.NONE;\n    let horizontalScrollDirection = AutoScrollHorizontalDirection.NONE;\n\n    // Check whether we should start scrolling any of the parent containers.\n    this._parentPositions.positions.forEach((position, element) => {\n      // We have special handling for the `document` below. Also this would be\n      // nicer with a  for...of loop, but it requires changing a compiler flag.\n      if (element === this._document || !position.clientRect || scrollNode) {\n        return;\n      }\n\n      if (isPointerNearClientRect(position.clientRect, DROP_PROXIMITY_THRESHOLD,\n          pointerX, pointerY)) {\n        [verticalScrollDirection, horizontalScrollDirection] = getElementScrollDirections(\n            element as HTMLElement, position.clientRect, pointerX, pointerY);\n\n        if (verticalScrollDirection || horizontalScrollDirection) {\n          scrollNode = element as HTMLElement;\n        }\n      }\n    });\n\n    // Otherwise check if we can start scrolling the viewport.\n    if (!verticalScrollDirection && !horizontalScrollDirection) {\n      const {width, height} = this._viewportRuler.getViewportSize();\n      const clientRect = {width, height, top: 0, right: width, bottom: height, left: 0};\n      verticalScrollDirection = getVerticalScrollDirection(clientRect, pointerY);\n      horizontalScrollDirection = getHorizontalScrollDirection(clientRect, pointerX);\n      scrollNode = window;\n    }\n\n    if (scrollNode && (verticalScrollDirection !== this._verticalScrollDirection ||\n        horizontalScrollDirection !== this._horizontalScrollDirection ||\n        scrollNode !== this._scrollNode)) {\n      this._verticalScrollDirection = verticalScrollDirection;\n      this._horizontalScrollDirection = horizontalScrollDirection;\n      this._scrollNode = scrollNode;\n\n      if ((verticalScrollDirection || horizontalScrollDirection) && scrollNode) {\n        this._ngZone.runOutsideAngular(this._startScrollInterval);\n      } else {\n        this._stopScrolling();\n      }\n    }\n  }\n\n  /** Stops any currently-running auto-scroll sequences. */\n  _stopScrolling() {\n    this._stopScrollTimers.next();\n  }\n\n  /** Starts the dragging sequence within the list. */\n  private _draggingStarted() {\n    const styles = coerceElement(this.element).style as DragCSSStyleDeclaration;\n    this.beforeStarted.next();\n    this._isDragging = true;\n\n    // We need to disable scroll snapping while the user is dragging, because it breaks automatic\n    // scrolling. The browser seems to round the value based on the snapping points which means\n    // that we can't increment/decrement the scroll position.\n    this._initialScrollSnap = styles.msScrollSnapType || styles.scrollSnapType || '';\n    styles.scrollSnapType = styles.msScrollSnapType = 'none';\n    this._cacheItems();\n    this._viewportScrollSubscription.unsubscribe();\n    this._listenToScrollEvents();\n  }\n\n  /** Caches the positions of the configured scrollable parents. */\n  private _cacheParentPositions() {\n    const element = coerceElement(this.element);\n    this._parentPositions.cache(this._scrollableElements);\n\n    // The list element is always in the `scrollableElements`\n    // so we can take advantage of the cached `ClientRect`.\n    this._clientRect = this._parentPositions.positions.get(element)!.clientRect!;\n  }\n\n  /** Refreshes the position cache of the items and sibling containers. */\n  private _cacheItemPositions() {\n    const isHorizontal = this._orientation === 'horizontal';\n\n    this._itemPositions = this._activeDraggables.map(drag => {\n      const elementToMeasure = drag.getVisibleElement();\n      return {\n        drag,\n        offset: 0,\n        initialTransform: elementToMeasure.style.transform || '',\n        clientRect: getMutableClientRect(elementToMeasure),\n      };\n    }).sort((a, b) => {\n      return isHorizontal ? a.clientRect.left - b.clientRect.left :\n                            a.clientRect.top - b.clientRect.top;\n    });\n  }\n\n  /** Resets the container to its initial state. */\n  private _reset() {\n    this._isDragging = false;\n\n    const styles = coerceElement(this.element).style as DragCSSStyleDeclaration;\n    styles.scrollSnapType = styles.msScrollSnapType = this._initialScrollSnap;\n\n    // TODO(crisbeto): may have to wait for the animations to finish.\n    this._activeDraggables.forEach(item => {\n      const rootElement = item.getRootElement();\n\n      if (rootElement) {\n        const initialTransform = this._itemPositions\n          .find(current => current.drag === item)?.initialTransform;\n        rootElement.style.transform = initialTransform || '';\n      }\n    });\n    this._siblings.forEach(sibling => sibling._stopReceiving(this));\n    this._activeDraggables = [];\n    this._itemPositions = [];\n    this._previousSwap.drag = null;\n    this._previousSwap.delta = 0;\n    this._previousSwap.overlaps = false;\n    this._stopScrolling();\n    this._viewportScrollSubscription.unsubscribe();\n    this._parentPositions.clear();\n  }\n\n  /**\n   * Gets the offset in pixels by which the items that aren't being dragged should be moved.\n   * @param currentIndex Index of the item currently being dragged.\n   * @param siblings All of the items in the list.\n   * @param delta Direction in which the user is moving.\n   */\n  private _getSiblingOffsetPx(currentIndex: number,\n                              siblings: CachedItemPosition[],\n                              delta: 1 | -1) {\n\n    const isHorizontal = this._orientation === 'horizontal';\n    const currentPosition = siblings[currentIndex].clientRect;\n    const immediateSibling = siblings[currentIndex + delta * -1];\n    let siblingOffset = currentPosition[isHorizontal ? 'width' : 'height'] * delta;\n\n    if (immediateSibling) {\n      const start = isHorizontal ? 'left' : 'top';\n      const end = isHorizontal ? 'right' : 'bottom';\n\n      // Get the spacing between the start of the current item and the end of the one immediately\n      // after it in the direction in which the user is dragging, or vice versa. We add it to the\n      // offset in order to push the element to where it will be when it's inline and is influenced\n      // by the `margin` of its siblings.\n      if (delta === -1) {\n        siblingOffset -= immediateSibling.clientRect[start] - currentPosition[end];\n      } else {\n        siblingOffset += currentPosition[start] - immediateSibling.clientRect[end];\n      }\n    }\n\n    return siblingOffset;\n  }\n\n  /**\n   * Gets the offset in pixels by which the item that is being dragged should be moved.\n   * @param currentPosition Current position of the item.\n   * @param newPosition Position of the item where the current item should be moved.\n   * @param delta Direction in which the user is moving.\n   */\n  private _getItemOffsetPx(currentPosition: ClientRect, newPosition: ClientRect, delta: 1 | -1) {\n    const isHorizontal = this._orientation === 'horizontal';\n    let itemOffset = isHorizontal ? newPosition.left - currentPosition.left :\n                                    newPosition.top - currentPosition.top;\n\n    // Account for differences in the item width/height.\n    if (delta === -1) {\n      itemOffset += isHorizontal ? newPosition.width - currentPosition.width :\n                                   newPosition.height - currentPosition.height;\n    }\n\n    return itemOffset;\n  }\n\n  /**\n   * Checks if pointer is entering in the first position\n   * @param pointerX Position of the user's pointer along the X axis.\n   * @param pointerY Position of the user's pointer along the Y axis.\n   */\n  private _shouldEnterAsFirstChild(pointerX: number, pointerY: number) {\n    if (!this._activeDraggables.length) {\n      return false;\n    }\n\n    const itemPositions = this._itemPositions;\n    const isHorizontal = this._orientation === 'horizontal';\n\n    // `itemPositions` are sorted by position while `activeDraggables` are sorted by child index\n    // check if container is using some sort of \"reverse\" ordering (eg: flex-direction: row-reverse)\n    const reversed = itemPositions[0].drag !== this._activeDraggables[0];\n    if (reversed) {\n      const lastItemRect = itemPositions[itemPositions.length - 1].clientRect;\n      return isHorizontal ? pointerX >= lastItemRect.right : pointerY >= lastItemRect.bottom;\n    } else {\n      const firstItemRect = itemPositions[0].clientRect;\n      return isHorizontal ? pointerX <= firstItemRect.left : pointerY <= firstItemRect.top;\n    }\n  }\n\n  /**\n   * Gets the index of an item in the drop container, based on the position of the user's pointer.\n   * @param item Item that is being sorted.\n   * @param pointerX Position of the user's pointer along the X axis.\n   * @param pointerY Position of the user's pointer along the Y axis.\n   * @param delta Direction in which the user is moving their pointer.\n   */\n  private _getItemIndexFromPointerPosition(item: DragRef, pointerX: number, pointerY: number,\n                                           delta?: {x: number, y: number}): number {\n    const isHorizontal = this._orientation === 'horizontal';\n    const index = findIndex(this._itemPositions, ({drag, clientRect}, _, array) => {\n      if (drag === item) {\n        // If there's only one item left in the container, it must be\n        // the dragged item itself so we use it as a reference.\n        return array.length < 2;\n      }\n\n      if (delta) {\n        const direction = isHorizontal ? delta.x : delta.y;\n\n        // If the user is still hovering over the same item as last time, their cursor hasn't left\n        // the item after we made the swap, and they didn't change the direction in which they're\n        // dragging, we don't consider it a direction swap.\n        if (drag === this._previousSwap.drag && this._previousSwap.overlaps &&\n            direction === this._previousSwap.delta) {\n          return false;\n        }\n      }\n\n      return isHorizontal ?\n          // Round these down since most browsers report client rects with\n          // sub-pixel precision, whereas the pointer coordinates are rounded to pixels.\n          pointerX >= Math.floor(clientRect.left) && pointerX < Math.floor(clientRect.right) :\n          pointerY >= Math.floor(clientRect.top) && pointerY < Math.floor(clientRect.bottom);\n    });\n\n    return (index === -1 || !this.sortPredicate(index, item, this)) ? -1 : index;\n  }\n\n  /** Caches the current items in the list and their positions. */\n  private _cacheItems(): void {\n    this._activeDraggables = this._draggables.slice();\n    this._cacheItemPositions();\n    this._cacheParentPositions();\n  }\n\n  /** Starts the interval that'll auto-scroll the element. */\n  private _startScrollInterval = () => {\n    this._stopScrolling();\n\n    interval(0, animationFrameScheduler)\n      .pipe(takeUntil(this._stopScrollTimers))\n      .subscribe(() => {\n        const node = this._scrollNode;\n        const scrollStep = this.autoScrollStep;\n\n        if (this._verticalScrollDirection === AutoScrollVerticalDirection.UP) {\n          incrementVerticalScroll(node, -scrollStep);\n        } else if (this._verticalScrollDirection === AutoScrollVerticalDirection.DOWN) {\n          incrementVerticalScroll(node, scrollStep);\n        }\n\n        if (this._horizontalScrollDirection === AutoScrollHorizontalDirection.LEFT) {\n          incrementHorizontalScroll(node, -scrollStep);\n        } else if (this._horizontalScrollDirection === AutoScrollHorizontalDirection.RIGHT) {\n          incrementHorizontalScroll(node, scrollStep);\n        }\n      });\n  }\n\n  /**\n   * Checks whether the user's pointer is positioned over the container.\n   * @param x Pointer position along the X axis.\n   * @param y Pointer position along the Y axis.\n   */\n  _isOverContainer(x: number, y: number): boolean {\n    return this._clientRect != null && isInsideClientRect(this._clientRect, x, y);\n  }\n\n  /**\n   * Figures out whether an item should be moved into a sibling\n   * drop container, based on its current position.\n   * @param item Drag item that is being moved.\n   * @param x Position of the item along the X axis.\n   * @param y Position of the item along the Y axis.\n   */\n  _getSiblingContainerFromPosition(item: DragRef, x: number, y: number): DropListRef | undefined {\n    return this._siblings.find(sibling => sibling._canReceive(item, x, y));\n  }\n\n  /**\n   * Checks whether the drop list can receive the passed-in item.\n   * @param item Item that is being dragged into the list.\n   * @param x Position of the item along the X axis.\n   * @param y Position of the item along the Y axis.\n   */\n  _canReceive(item: DragRef, x: number, y: number): boolean {\n    if (!this._clientRect || !isInsideClientRect(this._clientRect, x, y) ||\n        !this.enterPredicate(item, this)) {\n      return false;\n    }\n\n    const elementFromPoint = this._getShadowRoot().elementFromPoint(x, y) as HTMLElement | null;\n\n    // If there's no element at the pointer position, then\n    // the client rect is probably scrolled out of the view.\n    if (!elementFromPoint) {\n      return false;\n    }\n\n    const nativeElement = coerceElement(this.element);\n\n    // The `ClientRect`, that we're using to find the container over which the user is\n    // hovering, doesn't give us any information on whether the element has been scrolled\n    // out of the view or whether it's overlapping with other containers. This means that\n    // we could end up transferring the item into a container that's invisible or is positioned\n    // below another one. We use the result from `elementFromPoint` to get the top-most element\n    // at the pointer position and to find whether it's one of the intersecting drop containers.\n    return elementFromPoint === nativeElement || nativeElement.contains(elementFromPoint);\n  }\n\n  /**\n   * Called by one of the connected drop lists when a dragging sequence has started.\n   * @param sibling Sibling in which dragging has started.\n   */\n  _startReceiving(sibling: DropListRef, items: DragRef[]) {\n    const activeSiblings = this._activeSiblings;\n\n    if (!activeSiblings.has(sibling) && items.every(item => {\n      // Note that we have to add an exception to the `enterPredicate` for items that started off\n      // in this drop list. The drag ref has logic that allows an item to return to its initial\n      // container, if it has left the initial container and none of the connected containers\n      // allow it to enter. See `DragRef._updateActiveDropContainer` for more context.\n      return this.enterPredicate(item, this) || this._draggables.indexOf(item) > -1;\n    })) {\n      activeSiblings.add(sibling);\n      this._cacheParentPositions();\n      this._listenToScrollEvents();\n    }\n  }\n\n  /**\n   * Called by a connected drop list when dragging has stopped.\n   * @param sibling Sibling whose dragging has stopped.\n   */\n  _stopReceiving(sibling: DropListRef) {\n    this._activeSiblings.delete(sibling);\n    this._viewportScrollSubscription.unsubscribe();\n  }\n\n  /**\n   * Starts listening to scroll events on the viewport.\n   * Used for updating the internal state of the list.\n   */\n  private _listenToScrollEvents() {\n    this._viewportScrollSubscription = this._dragDropRegistry\n      .scrolled(this._getShadowRoot())\n      .subscribe(event => {\n        if (this.isDragging()) {\n          const scrollDifference = this._parentPositions.handleScroll(event);\n\n          if (scrollDifference) {\n            // Since we know the amount that the user has scrolled we can shift all of the\n            // client rectangles ourselves. This is cheaper than re-measuring everything and\n            // we can avoid inconsistent behavior where we might be measuring the element before\n            // its position has changed.\n            this._itemPositions.forEach(({clientRect}) => {\n              adjustClientRect(clientRect, scrollDifference.top, scrollDifference.left);\n            });\n\n            // We need two loops for this, because we want all of the cached\n            // positions to be up-to-date before we re-sort the item.\n            this._itemPositions.forEach(({drag}) => {\n              if (this._dragDropRegistry.isDragging(drag)) {\n                // We need to re-sort the item manually, because the pointer move\n                // events won't be dispatched while the user is scrolling.\n                drag._sortFromLastPointerPosition();\n              }\n            });\n          }\n        } else if (this.isReceiving()) {\n          this._cacheParentPositions();\n        }\n      });\n  }\n\n  /**\n   * Lazily resolves and returns the shadow root of the element. We do this in a function, rather\n   * than saving it in property directly on init, because we want to resolve it as late as possible\n   * in order to ensure that the element has been moved into the shadow DOM. Doing it inside the\n   * constructor might be too early if the element is inside of something like `ngFor` or `ngIf`.\n   */\n  private _getShadowRoot(): DocumentOrShadowRoot {\n    if (!this._cachedShadowRoot) {\n      const shadowRoot = _getShadowRoot(coerceElement(this.element));\n      this._cachedShadowRoot = shadowRoot || this._document;\n    }\n\n    return this._cachedShadowRoot;\n  }\n\n  /** Notifies any siblings that may potentially receive the item. */\n  private _notifyReceivingSiblings() {\n    const draggedItems = this._activeDraggables.filter(item => item.isDragging());\n    this._siblings.forEach(sibling => sibling._startReceiving(this, draggedItems));\n  }\n}\n\n\n/**\n * Finds the index of an item that matches a predicate function. Used as an equivalent\n * of `Array.prototype.findIndex` which isn't part of the standard Google typings.\n * @param array Array in which to look for matches.\n * @param predicate Function used to determine whether an item is a match.\n */\nfunction findIndex<T>(array: T[],\n                      predicate: (value: T, index: number, obj: T[]) => boolean): number {\n\n  for (let i = 0; i < array.length; i++) {\n    if (predicate(array[i], i, array)) {\n      return i;\n    }\n  }\n\n  return -1;\n}\n\n/**\n * Increments the vertical scroll position of a node.\n * @param node Node whose scroll position should change.\n * @param amount Amount of pixels that the `node` should be scrolled.\n */\nfunction incrementVerticalScroll(node: HTMLElement | Window, amount: number) {\n  if (node === window) {\n    (node as Window).scrollBy(0, amount);\n  } else {\n    // Ideally we could use `Element.scrollBy` here as well, but IE and Edge don't support it.\n    (node as HTMLElement).scrollTop += amount;\n  }\n}\n\n/**\n * Increments the horizontal scroll position of a node.\n * @param node Node whose scroll position should change.\n * @param amount Amount of pixels that the `node` should be scrolled.\n */\nfunction incrementHorizontalScroll(node: HTMLElement | Window, amount: number) {\n  if (node === window) {\n    (node as Window).scrollBy(amount, 0);\n  } else {\n    // Ideally we could use `Element.scrollBy` here as well, but IE and Edge don't support it.\n    (node as HTMLElement).scrollLeft += amount;\n  }\n}\n\n/**\n * Gets whether the vertical auto-scroll direction of a node.\n * @param clientRect Dimensions of the node.\n * @param pointerY Position of the user's pointer along the y axis.\n */\nfunction getVerticalScrollDirection(clientRect: ClientRect, pointerY: number) {\n  const {top, bottom, height} = clientRect;\n  const yThreshold = height * SCROLL_PROXIMITY_THRESHOLD;\n\n  if (pointerY >= top - yThreshold && pointerY <= top + yThreshold) {\n    return AutoScrollVerticalDirection.UP;\n  } else if (pointerY >= bottom - yThreshold && pointerY <= bottom + yThreshold) {\n    return AutoScrollVerticalDirection.DOWN;\n  }\n\n  return AutoScrollVerticalDirection.NONE;\n}\n\n/**\n * Gets whether the horizontal auto-scroll direction of a node.\n * @param clientRect Dimensions of the node.\n * @param pointerX Position of the user's pointer along the x axis.\n */\nfunction getHorizontalScrollDirection(clientRect: ClientRect, pointerX: number) {\n  const {left, right, width} = clientRect;\n  const xThreshold = width * SCROLL_PROXIMITY_THRESHOLD;\n\n  if (pointerX >= left - xThreshold && pointerX <= left + xThreshold) {\n    return AutoScrollHorizontalDirection.LEFT;\n  } else if (pointerX >= right - xThreshold && pointerX <= right + xThreshold) {\n    return AutoScrollHorizontalDirection.RIGHT;\n  }\n\n  return AutoScrollHorizontalDirection.NONE;\n}\n\n/**\n * Gets the directions in which an element node should be scrolled,\n * assuming that the user's pointer is already within it scrollable region.\n * @param element Element for which we should calculate the scroll direction.\n * @param clientRect Bounding client rectangle of the element.\n * @param pointerX Position of the user's pointer along the x axis.\n * @param pointerY Position of the user's pointer along the y axis.\n */\nfunction getElementScrollDirections(element: HTMLElement, clientRect: ClientRect, pointerX: number,\n  pointerY: number): [AutoScrollVerticalDirection, AutoScrollHorizontalDirection] {\n  const computedVertical = getVerticalScrollDirection(clientRect, pointerY);\n  const computedHorizontal = getHorizontalScrollDirection(clientRect, pointerX);\n  let verticalScrollDirection = AutoScrollVerticalDirection.NONE;\n  let horizontalScrollDirection = AutoScrollHorizontalDirection.NONE;\n\n  // Note that we here we do some extra checks for whether the element is actually scrollable in\n  // a certain direction and we only assign the scroll direction if it is. We do this so that we\n  // can allow other elements to be scrolled, if the current element can't be scrolled anymore.\n  // This allows us to handle cases where the scroll regions of two scrollable elements overlap.\n  if (computedVertical) {\n    const scrollTop = element.scrollTop;\n\n    if (computedVertical === AutoScrollVerticalDirection.UP) {\n      if (scrollTop > 0) {\n        verticalScrollDirection = AutoScrollVerticalDirection.UP;\n      }\n    } else if (element.scrollHeight - scrollTop > element.clientHeight) {\n      verticalScrollDirection = AutoScrollVerticalDirection.DOWN;\n    }\n  }\n\n  if (computedHorizontal) {\n    const scrollLeft = element.scrollLeft;\n\n    if (computedHorizontal === AutoScrollHorizontalDirection.LEFT) {\n      if (scrollLeft > 0) {\n        horizontalScrollDirection = AutoScrollHorizontalDirection.LEFT;\n      }\n    } else if (element.scrollWidth - scrollLeft > element.clientWidth) {\n      horizontalScrollDirection = AutoScrollHorizontalDirection.RIGHT;\n    }\n  }\n\n  return [verticalScrollDirection, horizontalScrollDirection];\n}\n"]}