/** * @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 { moveItemInArray } from '../drag-utils'; import { combineTransforms } from '../dom/styling'; import { adjustClientRect, getMutableClientRect, isInsideClientRect } from '../dom/client-rect'; /** * Strategy that only supports sorting along a single axis. * Items are reordered using CSS transforms which allows for sorting to be animated. * @docs-private */ export class SingleAxisSortStrategy { constructor(_element, _dragDropRegistry) { this._element = _element; this._dragDropRegistry = _dragDropRegistry; /** Cache of the dimensions of all the items inside the container. */ this._itemPositions = []; /** Direction in which the list is oriented. */ this.orientation = 'vertical'; /** * 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 occurred 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, }; } /** * To be called when the drag sequence starts. * @param items Items that are currently in the list. */ start(items) { this.withItems(items); } /** * To be called when an item is being sorted. * @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. */ sort(item, pointerX, pointerY, pointerDelta) { const siblings = this._itemPositions; const newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY, pointerDelta); if (newIndex === -1 && siblings.length > 0) { return null; } const isHorizontal = this.orientation === 'horizontal'; const currentIndex = siblings.findIndex(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); 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; return { previousIndex: currentIndex, currentIndex: newIndex }; } /** * Called when an item is being moved 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) { const newIndex = index == null || index < 0 ? // We use the coordinates of where the item entered the drop // zone to figure out at which index it should be inserted. this._getItemIndexFromPointerPosition(item, pointerX, pointerY) : 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]; } // If we didn't find a new position reference, it means that either the item didn't start off // in this container, or that the item requested to be inserted at the end of the list. if (!newPositionReference && (newIndex == null || newIndex === -1 || newIndex < activeDraggables.length - 1) && this._shouldEnterAsFirstChild(pointerX, pointerY)) { newPositionReference = activeDraggables[0]; } // 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 { 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 usually `start` is called together with `enter` when an item goes into a new // container. This will cache item positions, but we need to refresh them since the amount // of items has changed. this._cacheItemPositions(); } /** Sets the items that are currently part of the list. */ withItems(items) { this._activeDraggables = items.slice(); this._cacheItemPositions(); } /** Assigns a sort predicate to the strategy. */ withSortPredicate(predicate) { this._sortPredicate = predicate; } /** Resets the strategy to its initial state before dragging was started. */ reset() { // TODO(crisbeto): may have to wait for the animations to finish. this._activeDraggables.forEach(item => { const rootElement = item.getRootElement(); if (rootElement) { const initialTransform = this._itemPositions.find(p => p.drag === item)?.initialTransform; rootElement.style.transform = initialTransform || ''; } }); this._itemPositions = []; this._activeDraggables = []; this._previousSwap.drag = null; this._previousSwap.delta = 0; this._previousSwap.overlaps = false; } /** * Gets a snapshot of items currently in the list. * Can include items that we dragged in from another list. */ getActiveItemsSnapshot() { return this._activeDraggables; } /** Gets the index of a specific item. */ getItemIndex(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 items.findIndex(currentItem => currentItem.drag === item); } /** Used to notify the strategy that the scroll position has changed. */ updateOnScroll(topDifference, leftDifference) { // 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, topDifference, leftDifference); }); // 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(); } }); } /** 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; }); } /** * 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; } /** * 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; } /** * 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 = this._itemPositions.findIndex(({ drag, clientRect }) => { // Skip the item itself. if (drag === item) { return false; } 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) ? -1 : index; } } //# 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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 {Direction} from '@angular/cdk/bidi';\nimport {ElementRef} from '@angular/core';\nimport {coerceElement} from '@angular/cdk/coercion';\nimport {DragDropRegistry} from '../drag-drop-registry';\nimport {moveItemInArray} from '../drag-utils';\nimport {combineTransforms} from '../dom/styling';\nimport {adjustClientRect, getMutableClientRect, isInsideClientRect} from '../dom/client-rect';\nimport {\n  DropListSortStrategy,\n  DropListSortStrategyItem,\n  SortPredicate,\n} from './drop-list-sort-strategy';\n\n/**\n * Entry in the position cache for draggable items.\n * @docs-private\n */\ninterface CachedItemPosition<T> {\n  /** Instance of the drag item. */\n  drag: T;\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/**\n * Strategy that only supports sorting along a single axis.\n * Items are reordered using CSS transforms which allows for sorting to be animated.\n * @docs-private\n */\nexport class SingleAxisSortStrategy<T extends DropListSortStrategyItem>\n  implements DropListSortStrategy<T>\n{\n  /** Function used to determine if an item can be sorted into a specific index. */\n  private _sortPredicate: SortPredicate<T>;\n\n  /** Cache of the dimensions of all the items inside the container. */\n  private _itemPositions: CachedItemPosition<T>[] = [];\n\n  /**\n   * Draggable items that are currently active inside the container. Includes the items\n   * that were there at the start of the sequence, as well as any items that have been dragged\n   * in, but haven't been dropped yet.\n   */\n  private _activeDraggables: T[];\n\n  /** Direction in which the list is oriented. */\n  orientation: 'vertical' | 'horizontal' = 'vertical';\n\n  /** Layout direction of the drop list. */\n  direction: Direction;\n\n  constructor(\n    private _element: HTMLElement | ElementRef<HTMLElement>,\n    private _dragDropRegistry: DragDropRegistry<T, unknown>,\n  ) {}\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 occurred and whether the user's pointer continued to\n   * overlap with the swapped item after the swapping occurred.\n   */\n  private _previousSwap = {\n    drag: null as T | null,\n    delta: 0,\n    overlaps: false,\n  };\n\n  /**\n   * To be called when the drag sequence starts.\n   * @param items Items that are currently in the list.\n   */\n  start(items: readonly T[]) {\n    this.withItems(items);\n  }\n\n  /**\n   * To be called when an item is being sorted.\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  sort(item: T, pointerX: number, pointerY: number, pointerDelta: {x: number; y: number}) {\n    const siblings = this._itemPositions;\n    const newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY, pointerDelta);\n\n    if (newIndex === -1 && siblings.length > 0) {\n      return null;\n    }\n\n    const isHorizontal = this.orientation === 'horizontal';\n    const currentIndex = siblings.findIndex(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    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\n        ? 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)`,\n          sibling.initialTransform,\n        );\n        adjustClientRect(sibling.clientRect, 0, offset);\n      } else {\n        elementToOffset.style.transform = combineTransforms(\n          `translate3d(0, ${Math.round(sibling.offset)}px, 0)`,\n          sibling.initialTransform,\n        );\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    return {previousIndex: currentIndex, currentIndex: newIndex};\n  }\n\n  /**\n   * Called when an item is being moved 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: T, pointerX: number, pointerY: number, index?: number): void {\n    const newIndex =\n      index == null || index < 0\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          this._getItemIndexFromPointerPosition(item, pointerX, pointerY)\n        : index;\n\n    const activeDraggables = this._activeDraggables;\n    const currentIndex = activeDraggables.indexOf(item);\n    const placeholder = item.getPlaceholderElement();\n    let newPositionReference: T | 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    // If we didn't find a new position reference, it means that either the item didn't start off\n    // in this container, or that the item requested to be inserted at the end of the list.\n    if (\n      !newPositionReference &&\n      (newIndex == null || newIndex === -1 || newIndex < activeDraggables.length - 1) &&\n      this._shouldEnterAsFirstChild(pointerX, pointerY)\n    ) {\n      newPositionReference = activeDraggables[0];\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 {\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 usually `start` is called together with `enter` when an item goes into a new\n    // container. This will cache item positions, but we need to refresh them since the amount\n    // of items has changed.\n    this._cacheItemPositions();\n  }\n\n  /** Sets the items that are currently part of the list. */\n  withItems(items: readonly T[]): void {\n    this._activeDraggables = items.slice();\n    this._cacheItemPositions();\n  }\n\n  /** Assigns a sort predicate to the strategy. */\n  withSortPredicate(predicate: SortPredicate<T>): void {\n    this._sortPredicate = predicate;\n  }\n\n  /** Resets the strategy to its initial state before dragging was started. */\n  reset() {\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.find(p => p.drag === item)?.initialTransform;\n        rootElement.style.transform = initialTransform || '';\n      }\n    });\n\n    this._itemPositions = [];\n    this._activeDraggables = [];\n    this._previousSwap.drag = null;\n    this._previousSwap.delta = 0;\n    this._previousSwap.overlaps = false;\n  }\n\n  /**\n   * Gets a snapshot of items currently in the list.\n   * Can include items that we dragged in from another list.\n   */\n  getActiveItemsSnapshot(): readonly T[] {\n    return this._activeDraggables;\n  }\n\n  /** Gets the index of a specific item. */\n  getItemIndex(item: T): number {\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 =\n      this.orientation === 'horizontal' && this.direction === 'rtl'\n        ? this._itemPositions.slice().reverse()\n        : this._itemPositions;\n\n    return items.findIndex(currentItem => currentItem.drag === item);\n  }\n\n  /** Used to notify the strategy that the scroll position has changed. */\n  updateOnScroll(topDifference: number, leftDifference: number) {\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, topDifference, leftDifference);\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\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\n      .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      })\n      .sort((a, b) => {\n        return isHorizontal\n          ? a.clientRect.left - b.clientRect.left\n          : a.clientRect.top - b.clientRect.top;\n      });\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\n      ? 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\n        ? newPosition.width - currentPosition.width\n        : newPosition.height - currentPosition.height;\n    }\n\n    return itemOffset;\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(\n    currentIndex: number,\n    siblings: CachedItemPosition<T>[],\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   * 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(\n    item: T,\n    pointerX: number,\n    pointerY: number,\n    delta?: {x: number; y: number},\n  ): number {\n    const isHorizontal = this.orientation === 'horizontal';\n    const index = this._itemPositions.findIndex(({drag, clientRect}) => {\n      // Skip the item itself.\n      if (drag === item) {\n        return false;\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 (\n          drag === this._previousSwap.drag &&\n          this._previousSwap.overlaps &&\n          direction === this._previousSwap.delta\n        ) {\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) ? -1 : index;\n  }\n}\n"]}