{"version":3,"file":"_typeahead-chunk.mjs","sources":["../../../../../darwin_arm64-fastbuild-ST-fdfa778d11ba/bin/src/cdk/a11y/key-manager/typeahead.ts"],"sourcesContent":["/**\n * @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.dev/license\n */\n\nimport {A, NINE, Z, ZERO} from '../../keycodes';\nimport {Subject, Observable} from 'rxjs';\nimport {debounceTime, filter, map, tap} from 'rxjs/operators';\n\nconst DEFAULT_TYPEAHEAD_DEBOUNCE_INTERVAL_MS = 200;\n\ninterface TypeaheadItem {\n getLabel?(): string;\n}\n\ninterface TypeaheadConfig {\n debounceInterval?: number;\n skipPredicate?: (item: T) => boolean | undefined;\n}\n\n/**\n * Selects items based on keyboard inputs. Implements the typeahead functionality of\n * `role=\"listbox\"` or `role=\"tree\"` and other related roles.\n */\nexport class Typeahead {\n private readonly _letterKeyStream = new Subject();\n private _items: readonly T[] = [];\n private _selectedItemIndex = -1;\n\n /** Buffer for the letters that the user has pressed */\n private _pressedLetters: string[] = [];\n\n private _skipPredicateFn?: (item: T) => boolean | undefined;\n\n private readonly _selectedItem = new Subject();\n readonly selectedItem: Observable = this._selectedItem;\n\n constructor(initialItems: readonly T[], config?: TypeaheadConfig) {\n const typeAheadInterval =\n typeof config?.debounceInterval === 'number'\n ? config.debounceInterval\n : DEFAULT_TYPEAHEAD_DEBOUNCE_INTERVAL_MS;\n\n if (config?.skipPredicate) {\n this._skipPredicateFn = config.skipPredicate;\n }\n\n if (\n (typeof ngDevMode === 'undefined' || ngDevMode) &&\n initialItems.length &&\n initialItems.some(item => typeof item.getLabel !== 'function')\n ) {\n throw new Error('KeyManager items in typeahead mode must implement the `getLabel` method.');\n }\n\n this.setItems(initialItems);\n this._setupKeyHandler(typeAheadInterval);\n }\n\n destroy() {\n this._pressedLetters = [];\n this._letterKeyStream.complete();\n this._selectedItem.complete();\n }\n\n setCurrentSelectedItemIndex(index: number) {\n this._selectedItemIndex = index;\n }\n\n setItems(items: readonly T[]) {\n this._items = items;\n }\n\n handleKey(event: KeyboardEvent): void {\n const keyCode = event.keyCode;\n\n // Attempt to use the `event.key` which also maps it to the user's keyboard language,\n // otherwise fall back to resolving alphanumeric characters via the keyCode.\n if (event.key && event.key.length === 1) {\n this._letterKeyStream.next(event.key.toLocaleUpperCase());\n } else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) {\n this._letterKeyStream.next(String.fromCharCode(keyCode));\n }\n }\n\n /** Gets whether the user is currently typing into the manager using the typeahead feature. */\n isTyping(): boolean {\n return this._pressedLetters.length > 0;\n }\n\n /** Resets the currently stored sequence of typed letters. */\n reset(): void {\n this._pressedLetters = [];\n }\n\n private _setupKeyHandler(typeAheadInterval: number) {\n // Debounce the presses of non-navigational keys, collect the ones that correspond to letters\n // and convert those letters back into a string. 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