{"version":3,"file":"typeahead-0113d27c.mjs","sources":["../../../../../k8-fastbuild-ST-46c76129e412/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. Afterwards find the first item that starts\n // with that string and select it.\n this._letterKeyStream\n .pipe(\n tap(letter => this._pressedLetters.push(letter)),\n debounceTime(typeAheadInterval),\n filter(() => this._pressedLetters.length > 0),\n map(() => this._pressedLetters.join('').toLocaleUpperCase()),\n )\n .subscribe(inputString => {\n // Start at 1 because we want to start searching at the item immediately\n // following the current active item.\n for (let i = 1; i < this._items.length + 1; i++) {\n const index = (this._selectedItemIndex + i) % this._items.length;\n const item = this._items[index];\n\n if (\n !this._skipPredicateFn?.(item) &&\n item.getLabel?.().toLocaleUpperCase().trim().indexOf(inputString) === 0\n ) {\n this._selectedItem.next(item);\n break;\n }\n }\n\n this._pressedLetters = [];\n });\n }\n}\n"],"names":[],"mappings":";;;;AAYA,MAAM,sCAAsC,GAAG,GAAG,CAAA;AAWlD;;;AAGG;MACU,SAAS,CAAA;AACH,IAAA,gBAAgB,GAAG,IAAI,OAAO,EAAU,CAAA;IACjD,MAAM,GAAiB,EAAE,CAAA;IACzB,kBAAkB,GAAG,CAAC,CAAC,CAAA;;IAGvB,eAAe,GAAa,EAAE,CAAA;AAE9B,IAAA,gBAAgB,CAAA;AAEP,IAAA,aAAa,GAAG,IAAI,OAAO,EAAK,CAAA;AACxC,IAAA,YAAY,GAAkB,IAAI,CAAC,aAAa,CAAA;IAEzD,WAAY,CAAA,YAA0B,EAAE,MAA2B,EAAA;AACjE,QAAA,MAAM,iBAAiB,GACrB,OAAO,MAAM,EAAE,gBAAgB,KAAK,QAAQ;cACxC,MAAM,CAAC,gBAAgB;cACvB,sCAAsC,CAAA;AAE5C,QAAA,IAAI,MAAM,EAAE,aAAa,EAAE;AACzB,YAAA,IAAI,CAAC,gBAAgB,GAAG,MAAM,CAAC,aAAa,CAAA;SAC9C;AAEA,QAAA,IACE,CAAC,OAAO,SAAS,KAAK,WAAW,IAAI,SAAS;AAC9C,YAAA,YAAY,CAAC,MAAM;AACnB,YAAA,YAAY,CAAC,IAAI,CAAC,IAAI,IAAI,OAAO,IAAI,CAAC,QAAQ,KAAK,UAAU,CAAC,EAC9D;AACA,YAAA,MAAM,IAAI,KAAK,CAAC,0EAA0E,CAAC,CAAA;SAC7F;AAEA,QAAA,IAAI,CAAC,QAAQ,CAAC,YAAY,CAAC,CAAA;AAC3B,QAAA,IAAI,CAAC,gBAAgB,CAAC,iBAAiB,CAAC,CAAA;KAC1C;IAEA,OAAO,GAAA;AACL,QAAA,IAAI,CAAC,eAAe,GAAG,EAAE,CAAA;AACzB,QAAA,IAAI,CAAC,gBAAgB,CAAC,QAAQ,EAAE,CAAA;AAChC,QAAA,IAAI,CAAC,aAAa,CAAC,QAAQ,EAAE,CAAA;KAC/B;AAEA,IAAA,2BAA2B,CAAC,KAAa,EAAA;AACvC,QAAA,IAAI,CAAC,kBAAkB,GAAG,KAAK,CAAA;KACjC;AAEA,IAAA,QAAQ,CAAC,KAAmB,EAAA;AAC1B,QAAA,IAAI,CAAC,MAAM,GAAG,KAAK,CAAA;KACrB;AAEA,IAAA,SAAS,CAAC,KAAoB,EAAA;AAC5B,QAAA,MAAM,OAAO,GAAG,KAAK,CAAC,OAAO,CAAA;;;AAI7B,QAAA,IAAI,KAAK,CAAC,GAAG,IAAI,KAAK,CAAC,GAAG,CAAC,MAAM,KAAK,CAAC,EAAE;AACvC,YAAA,IAAI,CAAC,gBAAgB,CAAC,IAAI,CAAC,KAAK,CAAC,GAAG,CAAC,iBAAiB,EAAE,CAAC,CAAA;SAC3D;aAAO,IAAI,CAAC,OAAO,IAAI,CAAC,IAAI,OAAO,IAAI,CAAC,MAAM,OAAO,IAAI,IAAI,IAAI,OAAO,IAAI,IAAI,CAAC,EAAE;AACjF,YAAA,IAAI,CAAC,gBAAgB,CAAC,IAAI,CAAC,MAAM,CAAC,YAAY,CAAC,OAAO,CAAC,CAAC,CAAA;SAC1D;KACF;;IAGA,QAAQ,GAAA;AACN,QAAA,OAAO,IAAI,CAAC,eAAe,CAAC,MAAM,GAAG,CAAC,CAAA;KACxC;;IAGA,KAAK,GAAA;AACH,QAAA,IAAI,CAAC,eAAe,GAAG,EAAE,CAAA;KAC3B;AAEQ,IAAA,gBAAgB,CAAC,iBAAyB,EAAA;;;;AAIhD,QAAA,IAAI,CAAC,gBAAgB;aAClB,IAAI,CACH,GAAG,CAAC,MAAM,IAAI,IAAI,CAAC,eAAe,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC,EAChD,YAAY,CAAC,iBAAiB,CAAC,EAC/B,MAAM,CAAC,MAAM,IAAI,CAAC,eAAe,CAAC,MAAM,GAAG,CAAC,CAAC,EAC7C,GAAG,CAAC,MAAM,IAAI,CAAC,eAAe,CAAC,IAAI,CAAC,EAAE,CAAC,CAAC,iBAAiB,EAAE,CAAC,CAAA;aAE7D,SAAS,CAAC,WAAW,IAAG;;;AAGvB,YAAA,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,IAAI,CAAC,MAAM,CAAC,MAAM,GAAG,CAAC,EAAE,CAAC,EAAE,EAAE;AAC/C,gBAAA,MAAM,KAAK,GAAG,CAAC,IAAI,CAAC,kBAAkB,GAAG,CAAC,IAAI,IAAI,CAAC,MAAM,CAAC,MAAM,CAAA;gBAChE,MAAM,IAAI,GAAG,IAAI,CAAC,MAAM,CAAC,KAAK,CAAC,CAAA;AAE/B,gBAAA,IACE,CAAC,IAAI,CAAC,gBAAgB,GAAG,IAAI,CAAC;AAC9B,oBAAA,IAAI,CAAC,QAAQ,IAAI,CAAC,iBAAiB,EAAE,CAAC,IAAI,EAAE,CAAC,OAAO,CAAC,WAAW,CAAC,KAAK,CAAC,EACvE;AACA,oBAAA,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,IAAI,CAAC,CAAA;oBAC7B,MAAM;iBACR;aACF;AAEA,YAAA,IAAI,CAAC,eAAe,GAAG,EAAE,CAAA;AAC3B,SAAC,CAAC,CAAA;KACN;AACD;;;;"}