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* Copyright 2020 Adobe. All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\nimport {Collection, Direction, DisabledBehavior, Key, KeyboardDelegate, LayoutDelegate, Node, Orientation, Rect, RefObject} from '@react-types/shared';\nimport {DOMLayoutDelegate} from './DOMLayoutDelegate';\nimport {isScrollable} from '@react-aria/utils';\n\ninterface ListKeyboardDelegateOptions<T> {\n collection: Collection<Node<T>>,\n ref: RefObject<HTMLElement | null>,\n collator?: Intl.Collator,\n layout?: 'stack' | 'grid',\n orientation?: Orientation,\n direction?: Direction,\n disabledKeys?: Set<Key>,\n disabledBehavior?: DisabledBehavior,\n layoutDelegate?: LayoutDelegate\n}\n\nexport class ListKeyboardDelegate<T> implements KeyboardDelegate {\n private collection: Collection<Node<T>>;\n private disabledKeys: Set<Key>;\n private disabledBehavior: DisabledBehavior;\n private ref: RefObject<HTMLElement | null>;\n private collator: Intl.Collator | undefined;\n private layout: 'stack' | 'grid';\n private orientation?: Orientation;\n private direction?: Direction;\n private layoutDelegate: LayoutDelegate;\n\n constructor(collection: Collection<Node<T>>, disabledKeys: Set<Key>, ref: RefObject<HTMLElement | null>, collator?: Intl.Collator);\n constructor(options: ListKeyboardDelegateOptions<T>);\n constructor(...args: any[]) {\n if (args.length === 1) {\n let opts = args[0] as ListKeyboardDelegateOptions<T>;\n this.collection = opts.collection;\n this.ref = opts.ref;\n this.collator = opts.collator;\n this.disabledKeys = opts.disabledKeys || new Set();\n this.disabledBehavior = opts.disabledBehavior || 'all';\n this.orientation = opts.orientation || 'vertical';\n this.direction = opts.direction;\n this.layout = opts.layout || 'stack';\n this.layoutDelegate = opts.layoutDelegate || new DOMLayoutDelegate(opts.ref);\n } else {\n this.collection = args[0];\n this.disabledKeys = args[1];\n this.ref = args[2];\n this.collator = args[3];\n this.layout = 'stack';\n this.orientation = 'vertical';\n this.disabledBehavior = 'all';\n this.layoutDelegate = new DOMLayoutDelegate(this.ref);\n }\n\n // If this is a vertical stack, remove the left/right methods completely\n // so they aren't called by useDroppableCollection.\n if (this.layout === 'stack' && this.orientation === 'vertical') {\n this.getKeyLeftOf = undefined;\n this.getKeyRightOf = undefined;\n }\n }\n\n private isDisabled(item: Node<unknown>) {\n return this.disabledBehavior === 'all' && (item.props?.isDisabled || this.disabledKeys.has(item.key));\n }\n\n private findNextNonDisabled(key: Key | null, getNext: (key: Key) => Key | null): Key | null {\n let nextKey = key;\n while (nextKey != null) {\n let item = this.collection.getItem(nextKey);\n if (item?.type === 'item' && !this.isDisabled(item)) {\n return nextKey;\n }\n\n nextKey = getNext(nextKey);\n }\n\n return null;\n }\n\n getNextKey(key: Key): Key | null {\n let nextKey: Key | null = key;\n nextKey = this.collection.getKeyAfter(nextKey);\n return this.findNextNonDisabled(nextKey, key => this.collection.getKeyAfter(key));\n }\n\n getPreviousKey(key: Key): Key | null {\n let nextKey: Key | null = key;\n nextKey = this.collection.getKeyBefore(nextKey);\n return this.findNextNonDisabled(nextKey, key => this.collection.getKeyBefore(key));\n }\n\n private findKey(\n key: Key,\n nextKey: (key: Key) => Key | null,\n shouldSkip: (prevRect: Rect, itemRect: Rect) => boolean\n ) {\n let tempKey: Key | null = key;\n let itemRect = this.layoutDelegate.getItemRect(tempKey);\n if (!itemRect || tempKey == null) {\n return null;\n }\n\n // Find the item above or below in the same column.\n let prevRect = itemRect;\n do {\n tempKey = nextKey(tempKey);\n if (tempKey == null) {\n break;\n }\n itemRect = this.layoutDelegate.getItemRect(tempKey);\n } while (itemRect && shouldSkip(prevRect, itemRect) && tempKey != null);\n\n return tempKey;\n }\n\n private isSameRow(prevRect: Rect, itemRect: Rect) {\n return prevRect.y === itemRect.y || prevRect.x !== itemRect.x;\n }\n\n private isSameColumn(prevRect: Rect, itemRect: Rect) {\n return prevRect.x === itemRect.x || prevRect.y !== itemRect.y;\n }\n\n getKeyBelow(key: Key): Key | null {\n if (this.layout === 'grid' && this.orientation === 'vertical') {\n return this.findKey(key, (key) => this.getNextKey(key), this.isSameRow);\n } else {\n return this.getNextKey(key);\n }\n }\n\n getKeyAbove(key: Key): Key | null {\n if (this.layout === 'grid' && this.orientation === 'vertical') {\n return this.findKey(key, (key) => this.getPreviousKey(key), this.isSameRow);\n } else {\n return this.getPreviousKey(key);\n }\n }\n\n private getNextColumn(key: Key, right: boolean) {\n return right ? this.getPreviousKey(key) : this.getNextKey(key);\n }\n\n getKeyRightOf?(key: Key): Key | null {\n // This is a temporary solution for CardView until we refactor useSelectableCollection.\n // https://github.com/orgs/adobe/projects/19/views/32?pane=issue&itemId=77825042\n let layoutDelegateMethod = this.direction === 'ltr' ? 'getKeyRightOf' : 'getKeyLeftOf';\n if (this.layoutDelegate[layoutDelegateMethod]) {\n key = this.layoutDelegate[layoutDelegateMethod](key);\n return this.findNextNonDisabled(key, key => this.layoutDelegate[layoutDelegateMethod](key));\n }\n\n if (this.layout === 'grid') {\n if (this.orientation === 'vertical') {\n return this.getNextColumn(key, this.direction === 'rtl');\n } else {\n return this.findKey(key, (key) => this.getNextColumn(key, this.direction === 'rtl'), this.isSameColumn);\n }\n } else if (this.orientation === 'horizontal') {\n return this.getNextColumn(key, this.direction === 'rtl');\n }\n\n return null;\n }\n\n getKeyLeftOf?(key: Key): Key | null {\n let layoutDelegateMethod = this.direction === 'ltr' ? 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