{"version":3,"file":"autocomplete.mjs","sources":["../../../../../darwin_arm64-fastbuild-ST-46c76129e412/bin/src/material/autocomplete/autocomplete.ts","../../../../../darwin_arm64-fastbuild-ST-46c76129e412/bin/src/material/autocomplete/autocomplete.html","../../../../../darwin_arm64-fastbuild-ST-46c76129e412/bin/src/material/autocomplete/autocomplete-origin.ts","../../../../../darwin_arm64-fastbuild-ST-46c76129e412/bin/src/material/autocomplete/autocomplete-trigger.ts","../../../../../darwin_arm64-fastbuild-ST-46c76129e412/bin/src/material/autocomplete/module.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 {\n ANIMATION_MODULE_TYPE,\n AfterContentInit,\n ChangeDetectionStrategy,\n ChangeDetectorRef,\n Component,\n ContentChildren,\n ElementRef,\n EventEmitter,\n InjectionToken,\n Input,\n OnDestroy,\n Output,\n QueryList,\n TemplateRef,\n ViewChild,\n ViewEncapsulation,\n booleanAttribute,\n inject,\n} from '@angular/core';\nimport {\n MAT_OPTGROUP,\n MAT_OPTION_PARENT_COMPONENT,\n MatOptgroup,\n MatOption,\n ThemePalette,\n} from '../core';\nimport {_IdGenerator, ActiveDescendantKeyManager} from '@angular/cdk/a11y';\nimport {Platform} from '@angular/cdk/platform';\nimport {Subscription} from 'rxjs';\n\n/** Event object that is emitted when an autocomplete option is selected. */\nexport class MatAutocompleteSelectedEvent {\n constructor(\n /** Reference to the autocomplete panel that emitted the event. */\n public source: MatAutocomplete,\n /** Option that was selected. */\n public option: MatOption,\n ) {}\n}\n\n/** Event object that is emitted when an autocomplete option is activated. */\nexport interface MatAutocompleteActivatedEvent {\n /** Reference to the autocomplete panel that emitted the event. */\n source: MatAutocomplete;\n\n /** Option that was selected. */\n option: MatOption | null;\n}\n\n/** Default `mat-autocomplete` options that can be overridden. */\nexport interface MatAutocompleteDefaultOptions {\n /** Whether the first option should be highlighted when an autocomplete panel is opened. */\n autoActiveFirstOption?: boolean;\n\n /** Whether the active option should be selected as the user is navigating. */\n autoSelectActiveOption?: boolean;\n\n /**\n * Whether the user is required to make a selection when\n * they're interacting with the autocomplete.\n */\n requireSelection?: boolean;\n\n /** Class to be applied to the autocomplete's backdrop. */\n backdropClass?: string;\n\n /** Whether the autocomplete has a backdrop. */\n hasBackdrop?: boolean;\n\n /** Class or list of classes to be applied to the autocomplete's overlay panel. */\n overlayPanelClass?: string | string[];\n\n /** Whether icon indicators should be hidden for single-selection. */\n hideSingleSelectionIndicator?: boolean;\n}\n\n/** Injection token to be used to override the default options for `mat-autocomplete`. */\nexport const MAT_AUTOCOMPLETE_DEFAULT_OPTIONS = new InjectionToken(\n 'mat-autocomplete-default-options',\n {\n providedIn: 'root',\n factory: MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY,\n },\n);\n\n/**\n * @docs-private\n * @deprecated No longer used, will be removed.\n * @breaking-change 21.0.0\n */\nexport function MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY(): MatAutocompleteDefaultOptions {\n return {\n autoActiveFirstOption: false,\n autoSelectActiveOption: false,\n hideSingleSelectionIndicator: false,\n requireSelection: false,\n hasBackdrop: false,\n };\n}\n\n/** Autocomplete component. */\n@Component({\n selector: 'mat-autocomplete',\n templateUrl: 'autocomplete.html',\n styleUrl: 'autocomplete.css',\n encapsulation: ViewEncapsulation.None,\n changeDetection: ChangeDetectionStrategy.OnPush,\n exportAs: 'matAutocomplete',\n host: {\n 'class': 'mat-mdc-autocomplete',\n },\n providers: [{provide: MAT_OPTION_PARENT_COMPONENT, useExisting: MatAutocomplete}],\n})\nexport class MatAutocomplete implements AfterContentInit, OnDestroy {\n private _changeDetectorRef = inject(ChangeDetectorRef);\n private _elementRef = inject>(ElementRef);\n protected _defaults = inject(MAT_AUTOCOMPLETE_DEFAULT_OPTIONS);\n protected _animationsDisabled =\n inject(ANIMATION_MODULE_TYPE, {optional: true}) === 'NoopAnimations';\n private _activeOptionChanges = Subscription.EMPTY;\n\n /** Manages active item in option list based on key events. */\n _keyManager: ActiveDescendantKeyManager;\n\n /** Whether the autocomplete panel should be visible, depending on option length. */\n showPanel: boolean = false;\n\n /** Whether the autocomplete panel is open. */\n get isOpen(): boolean {\n return this._isOpen && this.showPanel;\n }\n _isOpen: boolean = false;\n\n /** Latest trigger that opened the autocomplete. */\n _latestOpeningTrigger: unknown;\n\n /** @docs-private Sets the theme color of the panel. */\n _setColor(value: ThemePalette) {\n this._color = value;\n this._changeDetectorRef.markForCheck();\n }\n /** @docs-private theme color of the panel */\n protected _color: ThemePalette;\n\n // The @ViewChild query for TemplateRef here needs to be static because some code paths\n // lead to the overlay being created before change detection has finished for this component.\n // Notably, another component may trigger `focus` on the autocomplete-trigger.\n\n /** @docs-private */\n @ViewChild(TemplateRef, {static: true}) template: TemplateRef;\n\n /** Element for the panel containing the autocomplete options. */\n @ViewChild('panel') panel: ElementRef;\n\n /** Reference to all options within the autocomplete. */\n @ContentChildren(MatOption, {descendants: true}) options: QueryList;\n\n /** Reference to all option groups within the autocomplete. */\n @ContentChildren(MAT_OPTGROUP, {descendants: true}) optionGroups: QueryList;\n\n /** Aria label of the autocomplete. */\n @Input('aria-label') ariaLabel: string;\n\n /** Input that can be used to specify the `aria-labelledby` attribute. */\n @Input('aria-labelledby') ariaLabelledby: string;\n\n /** Function that maps an option's control value to its display value in the trigger. */\n @Input() displayWith: ((value: any) => string) | null = null;\n\n /**\n * Whether the first option should be highlighted when the autocomplete panel is opened.\n * Can be configured globally through the `MAT_AUTOCOMPLETE_DEFAULT_OPTIONS` token.\n */\n @Input({transform: booleanAttribute}) autoActiveFirstOption: boolean;\n\n /** Whether the active option should be selected as the user is navigating. */\n @Input({transform: booleanAttribute}) autoSelectActiveOption: boolean;\n\n /**\n * Whether the user is required to make a selection when they're interacting with the\n * autocomplete. If the user moves away from the autocomplete without selecting an option from\n * the list, the value will be reset. If the user opens the panel and closes it without\n * interacting or selecting a value, the initial value will be kept.\n */\n @Input({transform: booleanAttribute}) requireSelection: boolean;\n\n /**\n * Specify the width of the autocomplete panel. Can be any CSS sizing value, otherwise it will\n * match the width of its host.\n */\n @Input() panelWidth: string | number;\n\n /** Whether ripples are disabled within the autocomplete panel. */\n @Input({transform: booleanAttribute}) disableRipple: boolean;\n\n /** Event that is emitted whenever an option from the list is selected. */\n @Output() readonly optionSelected: EventEmitter =\n new EventEmitter();\n\n /** Event that is emitted when the autocomplete panel is opened. */\n @Output() readonly opened: EventEmitter = new EventEmitter();\n\n /** Event that is emitted when the autocomplete panel is closed. */\n @Output() readonly closed: EventEmitter = new EventEmitter();\n\n /** Emits whenever an option is activated. */\n @Output() readonly optionActivated: EventEmitter =\n new EventEmitter();\n\n /**\n * Takes classes set on the host mat-autocomplete element and applies them to the panel\n * inside the overlay container to allow for easy styling.\n */\n @Input('class')\n set classList(value: string | string[]) {\n this._classList = value;\n this._elementRef.nativeElement.className = '';\n }\n _classList: string | string[];\n\n /** Whether checkmark indicator for single-selection options is hidden. */\n @Input({transform: booleanAttribute})\n get hideSingleSelectionIndicator(): boolean {\n return this._hideSingleSelectionIndicator;\n }\n set hideSingleSelectionIndicator(value: boolean) {\n this._hideSingleSelectionIndicator = value;\n this._syncParentProperties();\n }\n private _hideSingleSelectionIndicator: boolean;\n\n /** Syncs the parent state with the individual options. */\n _syncParentProperties(): void {\n if (this.options) {\n for (const option of this.options) {\n option._changeDetectorRef.markForCheck();\n }\n }\n }\n\n /** Unique ID to be used by autocomplete trigger's \"aria-owns\" property. */\n id: string = inject(_IdGenerator).getId('mat-autocomplete-');\n\n /**\n * Tells any descendant `mat-optgroup` to use the inert a11y pattern.\n * @docs-private\n */\n readonly inertGroups: boolean;\n\n constructor(...args: unknown[]);\n\n constructor() {\n const platform = inject(Platform);\n\n // TODO(crisbeto): the problem that the `inertGroups` option resolves is only present on\n // Safari using VoiceOver. We should occasionally check back to see whether the bug\n // wasn't resolved in VoiceOver, and if it has, we can remove this and the `inertGroups`\n // option altogether.\n this.inertGroups = platform?.SAFARI || false;\n this.autoActiveFirstOption = !!this._defaults.autoActiveFirstOption;\n this.autoSelectActiveOption = !!this._defaults.autoSelectActiveOption;\n this.requireSelection = !!this._defaults.requireSelection;\n this._hideSingleSelectionIndicator = this._defaults.hideSingleSelectionIndicator ?? false;\n }\n\n ngAfterContentInit() {\n this._keyManager = new ActiveDescendantKeyManager(this.options)\n .withWrap()\n .skipPredicate(this._skipPredicate);\n this._activeOptionChanges = this._keyManager.change.subscribe(index => {\n if (this.isOpen) {\n this.optionActivated.emit({source: this, option: this.options.toArray()[index] || null});\n }\n });\n\n // Set the initial visibility state.\n this._setVisibility();\n }\n\n ngOnDestroy() {\n this._keyManager?.destroy();\n this._activeOptionChanges.unsubscribe();\n }\n\n /**\n * Sets the panel scrollTop. This allows us to manually scroll to display options\n * above or below the fold, as they are not actually being focused when active.\n */\n _setScrollTop(scrollTop: number): void {\n if (this.panel) {\n this.panel.nativeElement.scrollTop = scrollTop;\n }\n }\n\n /** Returns the panel's scrollTop. */\n _getScrollTop(): number {\n return this.panel ? this.panel.nativeElement.scrollTop : 0;\n }\n\n /** Panel should hide itself when the option list is empty. */\n _setVisibility() {\n this.showPanel = !!this.options?.length;\n this._changeDetectorRef.markForCheck();\n }\n\n /** Emits the `select` event. */\n _emitSelectEvent(option: MatOption): void {\n const event = new MatAutocompleteSelectedEvent(this, option);\n this.optionSelected.emit(event);\n }\n\n /** Gets the aria-labelledby for the autocomplete panel. */\n _getPanelAriaLabelledby(labelId: string | null): string | null {\n if (this.ariaLabel) {\n return null;\n }\n\n const labelExpression = labelId ? labelId + ' ' : '';\n return this.ariaLabelledby ? labelExpression + this.ariaLabelledby : labelId;\n }\n\n // `skipPredicate` determines if key manager should avoid putting a given option in the tab\n // order. Allow disabled list items to receive focus via keyboard to align with WAI ARIA\n // recommendation.\n //\n // Normally WAI ARIA's instructions are to exclude disabled items from the tab order, but it\n // makes a few exceptions for compound widgets.\n //\n // From [Developing a Keyboard Interface](\n // https://www.w3.org/WAI/ARIA/apg/practices/keyboard-interface/):\n // \"For the following composite widget elements, keep them focusable when disabled: Options in a\n // Listbox...\"\n //\n // The user can focus disabled options using the keyboard, but the user cannot click disabled\n // options.\n protected _skipPredicate() {\n return false;\n }\n}\n","\n \n \n \n\n","/**\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 {Directive, ElementRef, inject} from '@angular/core';\n\n/**\n * Directive applied to an element to make it usable\n * as a connection point for an autocomplete panel.\n */\n@Directive({\n selector: '[matAutocompleteOrigin]',\n exportAs: 'matAutocompleteOrigin',\n})\nexport class MatAutocompleteOrigin {\n elementRef = inject>(ElementRef);\n\n constructor(...args: unknown[]);\n constructor() {}\n}\n","/**\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 {addAriaReferencedId, removeAriaReferencedId} from '@angular/cdk/a11y';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {DOWN_ARROW, ENTER, ESCAPE, TAB, UP_ARROW, hasModifierKey} from '@angular/cdk/keycodes';\nimport {BreakpointObserver, Breakpoints} from '@angular/cdk/layout';\nimport {\n ConnectedPosition,\n FlexibleConnectedPositionStrategy,\n Overlay,\n OverlayConfig,\n OverlayRef,\n PositionStrategy,\n ScrollStrategy,\n} from '@angular/cdk/overlay';\nimport {_getEventTarget, _getFocusedElementPierceShadowDom} from '@angular/cdk/platform';\nimport {TemplatePortal} from '@angular/cdk/portal';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {\n AfterViewInit,\n ChangeDetectorRef,\n Directive,\n ElementRef,\n EnvironmentInjector,\n InjectionToken,\n Input,\n NgZone,\n OnChanges,\n OnDestroy,\n Renderer2,\n SimpleChanges,\n ViewContainerRef,\n afterNextRender,\n booleanAttribute,\n forwardRef,\n inject,\n} from '@angular/core';\nimport {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms';\nimport {\n MatOption,\n MatOptionSelectionChange,\n _countGroupLabelsBeforeOption,\n _getOptionScrollPosition,\n} from '../core';\nimport {MAT_FORM_FIELD, MatFormField} from '../form-field';\nimport {Observable, Subject, Subscription, defer, merge, of as observableOf} from 'rxjs';\nimport {delay, filter, map, startWith, switchMap, take, tap} from 'rxjs/operators';\nimport {\n MAT_AUTOCOMPLETE_DEFAULT_OPTIONS,\n MatAutocomplete,\n MatAutocompleteDefaultOptions,\n} from './autocomplete';\nimport {MatAutocompleteOrigin} from './autocomplete-origin';\n\n/**\n * Provider that allows the autocomplete to register as a ControlValueAccessor.\n * @docs-private\n */\nexport const MAT_AUTOCOMPLETE_VALUE_ACCESSOR: any = {\n provide: NG_VALUE_ACCESSOR,\n useExisting: forwardRef(() => MatAutocompleteTrigger),\n multi: true,\n};\n\n/**\n * Creates an error to be thrown when attempting to use an autocomplete trigger without a panel.\n * @docs-private\n */\nexport function getMatAutocompleteMissingPanelError(): Error {\n return Error(\n 'Attempting to open an undefined instance of `mat-autocomplete`. ' +\n 'Make sure that the id passed to the `matAutocomplete` is correct and that ' +\n \"you're attempting to open it after the ngAfterContentInit hook.\",\n );\n}\n\n/** Injection token that determines the scroll handling while the autocomplete panel is open. */\nexport const MAT_AUTOCOMPLETE_SCROLL_STRATEGY = new InjectionToken<() => ScrollStrategy>(\n 'mat-autocomplete-scroll-strategy',\n {\n providedIn: 'root',\n factory: () => {\n const overlay = inject(Overlay);\n return () => overlay.scrollStrategies.reposition();\n },\n },\n);\n\n/**\n * @docs-private\n * @deprecated No longer used, will be removed.\n * @breaking-change 21.0.0\n */\nexport function MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY(overlay: Overlay): () => ScrollStrategy {\n return () => overlay.scrollStrategies.reposition();\n}\n\n/**\n * @docs-private\n * @deprecated No longer used, will be removed.\n * @breaking-change 21.0.0\n */\nexport const MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER = {\n provide: MAT_AUTOCOMPLETE_SCROLL_STRATEGY,\n deps: [Overlay],\n useFactory: MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY,\n};\n\n/** Base class with all of the `MatAutocompleteTrigger` functionality. */\n@Directive({\n selector: `input[matAutocomplete], textarea[matAutocomplete]`,\n host: {\n 'class': 'mat-mdc-autocomplete-trigger',\n '[attr.autocomplete]': 'autocompleteAttribute',\n '[attr.role]': 'autocompleteDisabled ? null : \"combobox\"',\n '[attr.aria-autocomplete]': 'autocompleteDisabled ? null : \"list\"',\n '[attr.aria-activedescendant]': '(panelOpen && activeOption) ? activeOption.id : null',\n '[attr.aria-expanded]': 'autocompleteDisabled ? null : panelOpen.toString()',\n '[attr.aria-controls]': '(autocompleteDisabled || !panelOpen) ? null : autocomplete?.id',\n '[attr.aria-haspopup]': 'autocompleteDisabled ? null : \"listbox\"',\n // Note: we use `focusin`, as opposed to `focus`, in order to open the panel\n // a little earlier. This avoids issues where IE delays the focusing of the input.\n '(focusin)': '_handleFocus()',\n '(blur)': '_onTouched()',\n '(input)': '_handleInput($event)',\n '(keydown)': '_handleKeydown($event)',\n '(click)': '_handleClick()',\n },\n exportAs: 'matAutocompleteTrigger',\n providers: [MAT_AUTOCOMPLETE_VALUE_ACCESSOR],\n})\nexport class MatAutocompleteTrigger\n implements ControlValueAccessor, AfterViewInit, OnChanges, OnDestroy\n{\n private _environmentInjector = inject(EnvironmentInjector);\n private _element = inject>(ElementRef);\n private _overlay = inject(Overlay);\n private _viewContainerRef = inject(ViewContainerRef);\n private _zone = inject(NgZone);\n private _changeDetectorRef = inject(ChangeDetectorRef);\n private _dir = inject(Directionality, {optional: true});\n private _formField = inject(MAT_FORM_FIELD, {optional: true, host: true});\n private _viewportRuler = inject(ViewportRuler);\n private _scrollStrategy = inject(MAT_AUTOCOMPLETE_SCROLL_STRATEGY);\n private _renderer = inject(Renderer2);\n private _defaults = inject(\n MAT_AUTOCOMPLETE_DEFAULT_OPTIONS,\n {optional: true},\n );\n\n private _overlayRef: OverlayRef | null;\n private _portal: TemplatePortal;\n private _componentDestroyed = false;\n private _initialized = new Subject();\n private _keydownSubscription: Subscription | null;\n private _outsideClickSubscription: Subscription | null;\n private _cleanupWindowBlur: (() => void) | undefined;\n\n /** Old value of the native input. Used to work around issues with the `input` event on IE. */\n private _previousValue: string | number | null;\n\n /** Value of the input element when the panel was attached (even if there are no options). */\n private _valueOnAttach: string | number | null;\n\n /** Value on the previous keydown event. */\n private _valueOnLastKeydown: string | null;\n\n /** Strategy that is used to position the panel. */\n private _positionStrategy: FlexibleConnectedPositionStrategy;\n\n /** Whether or not the label state is being overridden. */\n private _manuallyFloatingLabel = false;\n\n /** The subscription for closing actions (some are bound to document). */\n private _closingActionsSubscription: Subscription;\n\n /** Subscription to viewport size changes. */\n private _viewportSubscription = Subscription.EMPTY;\n\n /** Implements BreakpointObserver to be used to detect handset landscape */\n private _breakpointObserver = inject(BreakpointObserver);\n private _handsetLandscapeSubscription = Subscription.EMPTY;\n\n /**\n * Whether the autocomplete can open the next time it is focused. Used to prevent a focused,\n * closed autocomplete from being reopened if the user switches to another browser tab and then\n * comes back.\n */\n private _canOpenOnNextFocus = true;\n\n /** Value inside the input before we auto-selected an option. */\n private _valueBeforeAutoSelection: string | undefined;\n\n /**\n * Current option that we have auto-selected as the user is navigating,\n * but which hasn't been propagated to the model value yet.\n */\n private _pendingAutoselectedOption: MatOption | null;\n\n /** Stream of keyboard events that can close the panel. */\n private readonly _closeKeyEventStream = new Subject();\n\n /**\n * Event handler for when the window is blurred. Needs to be an\n * arrow function in order to preserve the context.\n */\n private _windowBlurHandler = () => {\n // If the user blurred the window while the autocomplete is focused, it means that it'll be\n // refocused when they come back. In this case we want to skip the first focus event, if the\n // pane was closed, in order to avoid reopening it unintentionally.\n this._canOpenOnNextFocus = this.panelOpen || !this._hasFocus();\n };\n\n /** `View -> model callback called when value changes` */\n _onChange: (value: any) => void = () => {};\n\n /** `View -> model callback called when autocomplete has been touched` */\n _onTouched = () => {};\n\n /** The autocomplete panel to be attached to this trigger. */\n @Input('matAutocomplete') autocomplete: MatAutocomplete;\n\n /**\n * Position of the autocomplete panel relative to the trigger element. A position of `auto`\n * will render the panel underneath the trigger if there is enough space for it to fit in\n * the viewport, otherwise the panel will be shown above it. If the position is set to\n * `above` or `below`, the panel will always be shown above or below the trigger. no matter\n * whether it fits completely in the viewport.\n */\n @Input('matAutocompletePosition') position: 'auto' | 'above' | 'below' = 'auto';\n\n /**\n * Reference relative to which to position the autocomplete panel.\n * Defaults to the autocomplete trigger element.\n */\n @Input('matAutocompleteConnectedTo') connectedTo: MatAutocompleteOrigin;\n\n /**\n * `autocomplete` attribute to be set on the input element.\n * @docs-private\n */\n @Input('autocomplete') autocompleteAttribute: string = 'off';\n\n /**\n * Whether the autocomplete is disabled. When disabled, the element will\n * act as a regular input and the user won't be able to open the panel.\n */\n @Input({alias: 'matAutocompleteDisabled', transform: booleanAttribute})\n autocompleteDisabled: boolean;\n\n constructor(...args: unknown[]);\n constructor() {}\n\n /** Class to apply to the panel when it's above the input. */\n private _aboveClass = 'mat-mdc-autocomplete-panel-above';\n\n ngAfterViewInit() {\n this._initialized.next();\n this._initialized.complete();\n this._cleanupWindowBlur = this._renderer.listen('window', 'blur', this._windowBlurHandler);\n }\n\n ngOnChanges(changes: SimpleChanges) {\n if (changes['position'] && this._positionStrategy) {\n this._setStrategyPositions(this._positionStrategy);\n\n if (this.panelOpen) {\n this._overlayRef!.updatePosition();\n }\n }\n }\n\n ngOnDestroy() {\n this._cleanupWindowBlur?.();\n this._handsetLandscapeSubscription.unsubscribe();\n this._viewportSubscription.unsubscribe();\n this._componentDestroyed = true;\n this._destroyPanel();\n this._closeKeyEventStream.complete();\n this._clearFromModal();\n }\n\n /** Whether or not the autocomplete panel is open. */\n get panelOpen(): boolean {\n return this._overlayAttached && this.autocomplete.showPanel;\n }\n private _overlayAttached: boolean = false;\n\n /** Opens the autocomplete suggestion panel. */\n openPanel(): void {\n this._openPanelInternal();\n }\n\n /** Closes the autocomplete suggestion panel. */\n closePanel(): void {\n this._resetLabel();\n\n if (!this._overlayAttached) {\n return;\n }\n\n if (this.panelOpen) {\n // Only emit if the panel was visible.\n // `afterNextRender` always runs outside of the Angular zone, so all the subscriptions from\n // `_subscribeToClosingActions()` are also outside of the Angular zone.\n // We should manually run in Angular zone to update UI after panel closing.\n this._zone.run(() => {\n this.autocomplete.closed.emit();\n });\n }\n\n // Only reset if this trigger is the latest one that opened the\n // autocomplete since another may have taken it over.\n if (this.autocomplete._latestOpeningTrigger === this) {\n this.autocomplete._isOpen = false;\n this.autocomplete._latestOpeningTrigger = null;\n }\n\n this._overlayAttached = false;\n this._pendingAutoselectedOption = null;\n\n if (this._overlayRef && this._overlayRef.hasAttached()) {\n this._overlayRef.detach();\n this._closingActionsSubscription.unsubscribe();\n }\n\n this._updatePanelState();\n\n // Note that in some cases this can end up being called after the component is destroyed.\n // Add a check to ensure that we don't try to run change detection on a destroyed view.\n if (!this._componentDestroyed) {\n // We need to trigger change detection manually, because\n // `fromEvent` doesn't seem to do it at the proper time.\n // This ensures that the label is reset when the\n // user clicks outside.\n this._changeDetectorRef.detectChanges();\n }\n\n // Remove aria-owns attribute when the autocomplete is no longer visible.\n if (this._trackedModal) {\n removeAriaReferencedId(this._trackedModal, 'aria-owns', this.autocomplete.id);\n }\n }\n\n /**\n * Updates the position of the autocomplete suggestion panel to ensure that it fits all options\n * within the viewport.\n */\n updatePosition(): void {\n if (this._overlayAttached) {\n this._overlayRef!.updatePosition();\n }\n }\n\n /**\n * A stream of actions that should close the autocomplete panel, including\n * when an option is selected, on blur, and when TAB is pressed.\n */\n get panelClosingActions(): Observable {\n return merge(\n this.optionSelections,\n this.autocomplete._keyManager.tabOut.pipe(filter(() => this._overlayAttached)),\n this._closeKeyEventStream,\n this._getOutsideClickStream(),\n this._overlayRef\n ? this._overlayRef.detachments().pipe(filter(() => this._overlayAttached))\n : observableOf(),\n ).pipe(\n // Normalize the output so we return a consistent type.\n map(event => (event instanceof MatOptionSelectionChange ? event : null)),\n );\n }\n\n /** Stream of changes to the selection state of the autocomplete options. */\n readonly optionSelections: Observable = defer(() => {\n const options = this.autocomplete ? this.autocomplete.options : null;\n\n if (options) {\n return options.changes.pipe(\n startWith(options),\n switchMap(() => merge(...options.map(option => option.onSelectionChange))),\n );\n }\n\n // If there are any subscribers before `ngAfterViewInit`, the `autocomplete` will be undefined.\n // Return a stream that we'll replace with the real one once everything is in place.\n return this._initialized.pipe(switchMap(() => this.optionSelections));\n }) as Observable;\n\n /** The currently active option, coerced to MatOption type. */\n get activeOption(): MatOption | null {\n if (this.autocomplete && this.autocomplete._keyManager) {\n return this.autocomplete._keyManager.activeItem;\n }\n\n return null;\n }\n\n /** Stream of clicks outside of the autocomplete panel. */\n private _getOutsideClickStream(): Observable {\n return new Observable(observer => {\n const listener = (event: MouseEvent | TouchEvent) => {\n // If we're in the Shadow DOM, the event target will be the shadow root, so we have to\n // fall back to check the first element in the path of the click event.\n const clickTarget = _getEventTarget(event)!;\n const formField = this._formField\n ? this._formField.getConnectedOverlayOrigin().nativeElement\n : null;\n const customOrigin = this.connectedTo ? this.connectedTo.elementRef.nativeElement : null;\n\n if (\n this._overlayAttached &&\n clickTarget !== this._element.nativeElement &&\n // Normally focus moves inside `mousedown` so this condition will almost always be\n // true. Its main purpose is to handle the case where the input is focused from an\n // outside click which propagates up to the `body` listener within the same sequence\n // and causes the panel to close immediately (see #3106).\n !this._hasFocus() &&\n (!formField || !formField.contains(clickTarget)) &&\n (!customOrigin || !customOrigin.contains(clickTarget)) &&\n !!this._overlayRef &&\n !this._overlayRef.overlayElement.contains(clickTarget)\n ) {\n observer.next(event);\n }\n };\n\n const cleanups = [\n this._renderer.listen('document', 'click', listener),\n this._renderer.listen('document', 'auxclick', listener),\n this._renderer.listen('document', 'touchend', listener),\n ];\n\n return () => {\n cleanups.forEach(current => current());\n };\n });\n }\n\n // Implemented as part of ControlValueAccessor.\n writeValue(value: any): void {\n Promise.resolve(null).then(() => this._assignOptionValue(value));\n }\n\n // Implemented as part of ControlValueAccessor.\n registerOnChange(fn: (value: any) => {}): void {\n this._onChange = fn;\n }\n\n // Implemented as part of ControlValueAccessor.\n registerOnTouched(fn: () => {}) {\n this._onTouched = fn;\n }\n\n // Implemented as part of ControlValueAccessor.\n setDisabledState(isDisabled: boolean) {\n this._element.nativeElement.disabled = isDisabled;\n }\n\n _handleKeydown(event: KeyboardEvent): void {\n const keyCode = event.keyCode;\n const hasModifier = hasModifierKey(event);\n\n // Prevent the default action on all escape key presses. This is here primarily to bring IE\n // in line with other browsers. By default, pressing escape on IE will cause it to revert\n // the input value to the one that it had on focus, however it won't dispatch any events\n // which means that the model value will be out of sync with the view.\n if (keyCode === ESCAPE && !hasModifier) {\n event.preventDefault();\n }\n\n this._valueOnLastKeydown = this._element.nativeElement.value;\n\n if (this.activeOption && keyCode === ENTER && this.panelOpen && !hasModifier) {\n this.activeOption._selectViaInteraction();\n this._resetActiveItem();\n event.preventDefault();\n } else if (this.autocomplete) {\n const prevActiveItem = this.autocomplete._keyManager.activeItem;\n const isArrowKey = keyCode === UP_ARROW || keyCode === DOWN_ARROW;\n\n if (keyCode === TAB || (isArrowKey && !hasModifier && this.panelOpen)) {\n this.autocomplete._keyManager.onKeydown(event);\n } else if (isArrowKey && this._canOpen()) {\n this._openPanelInternal(this._valueOnLastKeydown);\n }\n\n if (isArrowKey || this.autocomplete._keyManager.activeItem !== prevActiveItem) {\n this._scrollToOption(this.autocomplete._keyManager.activeItemIndex || 0);\n\n if (this.autocomplete.autoSelectActiveOption && this.activeOption) {\n if (!this._pendingAutoselectedOption) {\n this._valueBeforeAutoSelection = this._valueOnLastKeydown;\n }\n\n this._pendingAutoselectedOption = this.activeOption;\n this._assignOptionValue(this.activeOption.value);\n }\n }\n }\n }\n\n _handleInput(event: KeyboardEvent): void {\n let target = event.target as HTMLInputElement;\n let value: number | string | null = target.value;\n\n // Based on `NumberValueAccessor` from forms.\n if (target.type === 'number') {\n value = value == '' ? null : parseFloat(value);\n }\n\n // If the input has a placeholder, IE will fire the `input` event on page load,\n // focus and blur, in addition to when the user actually changed the value. To\n // filter out all of the extra events, we save the value on focus and between\n // `input` events, and we check whether it changed.\n // See: https://connect.microsoft.com/IE/feedback/details/885747/\n if (this._previousValue !== value) {\n this._previousValue = value;\n this._pendingAutoselectedOption = null;\n\n // If selection is required we don't write to the CVA while the user is typing.\n // At the end of the selection either the user will have picked something\n // or we'll reset the value back to null.\n if (!this.autocomplete || !this.autocomplete.requireSelection) {\n this._onChange(value);\n }\n\n if (!value) {\n this._clearPreviousSelectedOption(null, false);\n } else if (this.panelOpen && !this.autocomplete.requireSelection) {\n // Note that we don't reset this when `requireSelection` is enabled,\n // because the option will be reset when the panel is closed.\n const selectedOption = this.autocomplete.options?.find(option => option.selected);\n\n if (selectedOption) {\n const display = this._getDisplayValue(selectedOption.value);\n\n if (value !== display) {\n selectedOption.deselect(false);\n }\n }\n }\n\n if (this._canOpen() && this._hasFocus()) {\n // When the `input` event fires, the input's value will have already changed. This means\n // that if we take the `this._element.nativeElement.value` directly, it'll be one keystroke\n // behind. This can be a problem when the user selects a value, changes a character while\n // the input still has focus and then clicks away (see #28432). To work around it, we\n // capture the value in `keydown` so we can use it here.\n const valueOnAttach = this._valueOnLastKeydown ?? this._element.nativeElement.value;\n this._valueOnLastKeydown = null;\n this._openPanelInternal(valueOnAttach);\n }\n }\n }\n\n _handleFocus(): void {\n if (!this._canOpenOnNextFocus) {\n this._canOpenOnNextFocus = true;\n } else if (this._canOpen()) {\n this._previousValue = this._element.nativeElement.value;\n this._attachOverlay(this._previousValue);\n this._floatLabel(true);\n }\n }\n\n _handleClick(): void {\n if (this._canOpen() && !this.panelOpen) {\n this._openPanelInternal();\n }\n }\n\n /** Whether the input currently has focus. */\n private _hasFocus(): boolean {\n return _getFocusedElementPierceShadowDom() === this._element.nativeElement;\n }\n\n /**\n * In \"auto\" mode, the label will animate down as soon as focus is lost.\n * This causes the value to jump when selecting an option with the mouse.\n * This method manually floats the label until the panel can be closed.\n * @param shouldAnimate Whether the label should be animated when it is floated.\n */\n private _floatLabel(shouldAnimate = false): void {\n if (this._formField && this._formField.floatLabel === 'auto') {\n if (shouldAnimate) {\n this._formField._animateAndLockLabel();\n } else {\n this._formField.floatLabel = 'always';\n }\n\n this._manuallyFloatingLabel = true;\n }\n }\n\n /** If the label has been manually elevated, return it to its normal state. */\n private _resetLabel(): void {\n if (this._manuallyFloatingLabel) {\n if (this._formField) {\n this._formField.floatLabel = 'auto';\n }\n this._manuallyFloatingLabel = false;\n }\n }\n\n /**\n * This method listens to a stream of panel closing actions and resets the\n * stream every time the option list changes.\n */\n private _subscribeToClosingActions(): Subscription {\n const initialRender = new Observable(subscriber => {\n afterNextRender(\n () => {\n subscriber.next();\n },\n {injector: this._environmentInjector},\n );\n });\n const optionChanges = this.autocomplete.options?.changes.pipe(\n tap(() => this._positionStrategy.reapplyLastPosition()),\n // Defer emitting to the stream until the next tick, because changing\n // bindings in here will cause \"changed after checked\" errors.\n delay(0),\n ) ?? observableOf();\n\n // When the options are initially rendered, and when the option list changes...\n return (\n merge(initialRender, optionChanges)\n .pipe(\n // create a new stream of panelClosingActions, replacing any previous streams\n // that were created, and flatten it so our stream only emits closing events...\n switchMap(() =>\n this._zone.run(() => {\n // `afterNextRender` always runs outside of the Angular zone, thus we have to re-enter\n // the Angular zone. This will lead to change detection being called outside of the Angular\n // zone and the `autocomplete.opened` will also emit outside of the Angular.\n const wasOpen = this.panelOpen;\n this._resetActiveItem();\n this._updatePanelState();\n this._changeDetectorRef.detectChanges();\n\n if (this.panelOpen) {\n this._overlayRef!.updatePosition();\n }\n\n if (wasOpen !== this.panelOpen) {\n // If the `panelOpen` state changed, we need to make sure to emit the `opened` or\n // `closed` event, because we may not have emitted it. This can happen\n // - if the users opens the panel and there are no options, but the\n // options come in slightly later or as a result of the value changing,\n // - if the panel is closed after the user entered a string that did not match any\n // of the available options,\n // - if a valid string is entered after an invalid one.\n if (this.panelOpen) {\n this._emitOpened();\n } else {\n this.autocomplete.closed.emit();\n }\n }\n\n return this.panelClosingActions;\n }),\n ),\n // when the first closing event occurs...\n take(1),\n )\n // set the value, close the panel, and complete.\n .subscribe(event => this._setValueAndClose(event))\n );\n }\n\n /**\n * Emits the opened event once it's known that the panel will be shown and stores\n * the state of the trigger right before the opening sequence was finished.\n */\n private _emitOpened() {\n this.autocomplete.opened.emit();\n }\n\n /** Destroys the autocomplete suggestion panel. */\n private _destroyPanel(): void {\n if (this._overlayRef) {\n this.closePanel();\n this._overlayRef.dispose();\n this._overlayRef = null;\n }\n }\n\n /** Given a value, returns the string that should be shown within the input. */\n private _getDisplayValue(value: T): T | string {\n const autocomplete = this.autocomplete;\n return autocomplete && autocomplete.displayWith ? autocomplete.displayWith(value) : value;\n }\n\n private _assignOptionValue(value: any): void {\n const toDisplay = this._getDisplayValue(value);\n\n if (value == null) {\n this._clearPreviousSelectedOption(null, false);\n }\n\n // Simply falling back to an empty string if the display value is falsy does not work properly.\n // The display value can also be the number zero and shouldn't fall back to an empty string.\n this._updateNativeInputValue(toDisplay != null ? toDisplay : '');\n }\n\n private _updateNativeInputValue(value: string): void {\n // If it's used within a `MatFormField`, we should set it through the property so it can go\n // through change detection.\n if (this._formField) {\n this._formField._control.value = value;\n } else {\n this._element.nativeElement.value = value;\n }\n\n this._previousValue = value;\n }\n\n /**\n * This method closes the panel, and if a value is specified, also sets the associated\n * control to that value. It will also mark the control as dirty if this interaction\n * stemmed from the user.\n */\n private _setValueAndClose(event: MatOptionSelectionChange | null): void {\n const panel = this.autocomplete;\n const toSelect = event ? event.source : this._pendingAutoselectedOption;\n\n if (toSelect) {\n this._clearPreviousSelectedOption(toSelect);\n this._assignOptionValue(toSelect.value);\n // TODO(crisbeto): this should wait until the animation is done, otherwise the value\n // gets reset while the panel is still animating which looks glitchy. It'll likely break\n // some tests to change it at this point.\n this._onChange(toSelect.value);\n panel._emitSelectEvent(toSelect);\n this._element.nativeElement.focus();\n } else if (\n panel.requireSelection &&\n this._element.nativeElement.value !== this._valueOnAttach\n ) {\n this._clearPreviousSelectedOption(null);\n this._assignOptionValue(null);\n this._onChange(null);\n }\n\n this.closePanel();\n }\n\n /**\n * Clear any previous selected option and emit a selection change event for this option\n */\n private _clearPreviousSelectedOption(skip: MatOption | null, emitEvent?: boolean) {\n // Null checks are necessary here, because the autocomplete\n // or its options may not have been assigned yet.\n this.autocomplete?.options?.forEach(option => {\n if (option !== skip && option.selected) {\n option.deselect(emitEvent);\n }\n });\n }\n\n private _openPanelInternal(valueOnAttach = this._element.nativeElement.value) {\n this._attachOverlay(valueOnAttach);\n this._floatLabel();\n // Add aria-owns attribute when the autocomplete becomes visible.\n if (this._trackedModal) {\n const panelId = this.autocomplete.id;\n addAriaReferencedId(this._trackedModal, 'aria-owns', panelId);\n }\n }\n\n private _attachOverlay(valueOnAttach: string): void {\n if (!this.autocomplete && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n throw getMatAutocompleteMissingPanelError();\n }\n\n let overlayRef = this._overlayRef;\n\n if (!overlayRef) {\n this._portal = new TemplatePortal(this.autocomplete.template, this._viewContainerRef, {\n id: this._formField?.getLabelId(),\n });\n overlayRef = this._overlay.create(this._getOverlayConfig());\n this._overlayRef = overlayRef;\n this._viewportSubscription = this._viewportRuler.change().subscribe(() => {\n if (this.panelOpen && overlayRef) {\n overlayRef.updateSize({width: this._getPanelWidth()});\n }\n });\n // Subscribe to the breakpoint events stream to detect when screen is in\n // handsetLandscape.\n this._handsetLandscapeSubscription = this._breakpointObserver\n .observe(Breakpoints.HandsetLandscape)\n .subscribe(result => {\n const isHandsetLandscape = result.matches;\n // Check if result.matches Breakpoints.HandsetLandscape. Apply HandsetLandscape\n // settings to prevent overlay cutoff in that breakpoint. Fixes b/284148377\n if (isHandsetLandscape) {\n this._positionStrategy\n .withFlexibleDimensions(true)\n .withGrowAfterOpen(true)\n .withViewportMargin(8);\n } else {\n this._positionStrategy\n .withFlexibleDimensions(false)\n .withGrowAfterOpen(false)\n .withViewportMargin(0);\n }\n });\n } else {\n // Update the trigger, panel width and direction, in case anything has changed.\n this._positionStrategy.setOrigin(this._getConnectedElement());\n overlayRef.updateSize({width: this._getPanelWidth()});\n }\n\n if (overlayRef && !overlayRef.hasAttached()) {\n overlayRef.attach(this._portal);\n this._valueOnAttach = valueOnAttach;\n this._valueOnLastKeydown = null;\n this._closingActionsSubscription = this._subscribeToClosingActions();\n }\n\n const wasOpen = this.panelOpen;\n\n this.autocomplete._isOpen = this._overlayAttached = true;\n this.autocomplete._latestOpeningTrigger = this;\n this.autocomplete._setColor(this._formField?.color);\n this._updatePanelState();\n this._applyModalPanelOwnership();\n\n // We need to do an extra `panelOpen` check in here, because the\n // autocomplete won't be shown if there are no options.\n if (this.panelOpen && wasOpen !== this.panelOpen) {\n this._emitOpened();\n }\n }\n\n /** Handles keyboard events coming from the overlay panel. */\n private _handlePanelKeydown = (event: KeyboardEvent) => {\n // Close when pressing ESCAPE or ALT + UP_ARROW, based on the a11y guidelines.\n // See: https://www.w3.org/TR/wai-aria-practices-1.1/#textbox-keyboard-interaction\n if (\n (event.keyCode === ESCAPE && !hasModifierKey(event)) ||\n (event.keyCode === UP_ARROW && hasModifierKey(event, 'altKey'))\n ) {\n // If the user had typed something in before we autoselected an option, and they decided\n // to cancel the selection, restore the input value to the one they had typed in.\n if (this._pendingAutoselectedOption) {\n this._updateNativeInputValue(this._valueBeforeAutoSelection ?? '');\n this._pendingAutoselectedOption = null;\n }\n this._closeKeyEventStream.next();\n this._resetActiveItem();\n // We need to stop propagation, otherwise the event will eventually\n // reach the input itself and cause the overlay to be reopened.\n event.stopPropagation();\n event.preventDefault();\n }\n };\n\n /** Updates the panel's visibility state and any trigger state tied to id. */\n private _updatePanelState() {\n this.autocomplete._setVisibility();\n\n // Note that here we subscribe and unsubscribe based on the panel's visiblity state,\n // because the act of subscribing will prevent events from reaching other overlays and\n // we don't want to block the events if there are no options.\n if (this.panelOpen) {\n const overlayRef = this._overlayRef!;\n\n if (!this._keydownSubscription) {\n // Use the `keydownEvents` in order to take advantage of\n // the overlay event targeting provided by the CDK overlay.\n this._keydownSubscription = overlayRef.keydownEvents().subscribe(this._handlePanelKeydown);\n }\n\n if (!this._outsideClickSubscription) {\n // Subscribe to the pointer events stream so that it doesn't get picked up by other overlays.\n // TODO(crisbeto): we should switch `_getOutsideClickStream` eventually to use this stream,\n // but the behvior isn't exactly the same and it ends up breaking some internal tests.\n this._outsideClickSubscription = overlayRef.outsidePointerEvents().subscribe();\n }\n } else {\n this._keydownSubscription?.unsubscribe();\n this._outsideClickSubscription?.unsubscribe();\n this._keydownSubscription = this._outsideClickSubscription = null;\n }\n }\n\n private _getOverlayConfig(): OverlayConfig {\n return new OverlayConfig({\n positionStrategy: this._getOverlayPosition(),\n scrollStrategy: this._scrollStrategy(),\n width: this._getPanelWidth(),\n direction: this._dir ?? undefined,\n hasBackdrop: this._defaults?.hasBackdrop,\n backdropClass: this._defaults?.backdropClass,\n panelClass: this._defaults?.overlayPanelClass,\n });\n }\n\n private _getOverlayPosition(): PositionStrategy {\n // Set default Overlay Position\n const strategy = this._overlay\n .position()\n .flexibleConnectedTo(this._getConnectedElement())\n .withFlexibleDimensions(false)\n .withPush(false);\n\n this._setStrategyPositions(strategy);\n this._positionStrategy = strategy;\n return strategy;\n }\n\n /** Sets the positions on a position strategy based on the directive's input state. */\n private _setStrategyPositions(positionStrategy: FlexibleConnectedPositionStrategy) {\n // Note that we provide horizontal fallback positions, even though by default the dropdown\n // width matches the input, because consumers can override the width. See #18854.\n const belowPositions: ConnectedPosition[] = [\n {originX: 'start', originY: 'bottom', overlayX: 'start', overlayY: 'top'},\n {originX: 'end', originY: 'bottom', overlayX: 'end', overlayY: 'top'},\n ];\n\n // The overlay edge connected to the trigger should have squared corners, while\n // the opposite end has rounded corners. We apply a CSS class to swap the\n // border-radius based on the overlay position.\n const panelClass = this._aboveClass;\n const abovePositions: ConnectedPosition[] = [\n {originX: 'start', originY: 'top', overlayX: 'start', overlayY: 'bottom', panelClass},\n {originX: 'end', originY: 'top', overlayX: 'end', overlayY: 'bottom', panelClass},\n ];\n\n let positions: ConnectedPosition[];\n\n if (this.position === 'above') {\n positions = abovePositions;\n } else if (this.position === 'below') {\n positions = belowPositions;\n } else {\n positions = [...belowPositions, ...abovePositions];\n }\n\n positionStrategy.withPositions(positions);\n }\n\n private _getConnectedElement(): ElementRef {\n if (this.connectedTo) {\n return this.connectedTo.elementRef;\n }\n\n return this._formField ? this._formField.getConnectedOverlayOrigin() : this._element;\n }\n\n private _getPanelWidth(): number | string {\n return this.autocomplete.panelWidth || this._getHostWidth();\n }\n\n /** Returns the width of the input element, so the panel width can match it. */\n private _getHostWidth(): number {\n return this._getConnectedElement().nativeElement.getBoundingClientRect().width;\n }\n\n /**\n * Reset the active item to -1. This is so that pressing arrow keys will activate the correct\n * option.\n *\n * If the consumer opted-in to automatically activatating the first option, activate the first\n * *enabled* option.\n */\n private _resetActiveItem(): void {\n const autocomplete = this.autocomplete;\n\n if (autocomplete.autoActiveFirstOption) {\n // Find the index of the first *enabled* option. Avoid calling `_keyManager.setActiveItem`\n // because it activates the first option that passes the skip predicate, rather than the\n // first *enabled* option.\n let firstEnabledOptionIndex = -1;\n\n for (let index = 0; index < autocomplete.options.length; index++) {\n const option = autocomplete.options.get(index)!;\n if (!option.disabled) {\n firstEnabledOptionIndex = index;\n break;\n }\n }\n autocomplete._keyManager.setActiveItem(firstEnabledOptionIndex);\n } else {\n autocomplete._keyManager.setActiveItem(-1);\n }\n }\n\n /** Determines whether the panel can be opened. */\n private _canOpen(): boolean {\n const element = this._element.nativeElement;\n return !element.readOnly && !element.disabled && !this.autocompleteDisabled;\n }\n\n /** Scrolls to a particular option in the list. */\n private _scrollToOption(index: number): void {\n // Given that we are not actually focusing active options, we must manually adjust scroll\n // to reveal options below the fold. First, we find the offset of the option from the top\n // of the panel. If that offset is below the fold, the new scrollTop will be the offset -\n // the panel height + the option height, so the active option will be just visible at the\n // bottom of the panel. If that offset is above the top of the visible panel, the new scrollTop\n // will become the offset. If that offset is visible within the panel already, the scrollTop is\n // not adjusted.\n const autocomplete = this.autocomplete;\n const labelCount = _countGroupLabelsBeforeOption(\n index,\n autocomplete.options,\n autocomplete.optionGroups,\n );\n\n if (index === 0 && labelCount === 1) {\n // If we've got one group label before the option and we're at the top option,\n // scroll the list to the top. This is better UX than scrolling the list to the\n // top of the option, because it allows the user to read the top group's label.\n autocomplete._setScrollTop(0);\n } else if (autocomplete.panel) {\n const option = autocomplete.options.toArray()[index];\n\n if (option) {\n const element = option._getHostElement();\n const newScrollPosition = _getOptionScrollPosition(\n element.offsetTop,\n element.offsetHeight,\n autocomplete._getScrollTop(),\n autocomplete.panel.nativeElement.offsetHeight,\n );\n\n autocomplete._setScrollTop(newScrollPosition);\n }\n }\n }\n\n /**\n * Track which modal we have modified the `aria-owns` attribute of. When the combobox trigger is\n * inside an aria-modal, we apply aria-owns to the parent modal with the `id` of the options\n * panel. Track the modal we have changed so we can undo the changes on destroy.\n */\n private _trackedModal: Element | null = null;\n\n /**\n * If the autocomplete trigger is inside of an `aria-modal` element, connect\n * that modal to the options panel with `aria-owns`.\n *\n * For some browser + screen reader combinations, when navigation is inside\n * of an `aria-modal` element, the screen reader treats everything outside\n * of that modal as hidden or invisible.\n *\n * This causes a problem when the combobox trigger is _inside_ of a modal, because the\n * options panel is rendered _outside_ of that modal, preventing screen reader navigation\n * from reaching the panel.\n *\n * We can work around this issue by applying `aria-owns` to the modal with the `id` of\n * the options panel. This effectively communicates to assistive technology that the\n * options panel is part of the same interaction as the modal.\n *\n * At time of this writing, this issue is present in VoiceOver.\n * See https://github.com/angular/components/issues/20694\n */\n private _applyModalPanelOwnership() {\n // TODO(http://github.com/angular/components/issues/26853): consider de-duplicating this with\n // the `LiveAnnouncer` and any other usages.\n //\n // Note that the selector here is limited to CDK overlays at the moment in order to reduce the\n // section of the DOM we need to look through. This should cover all the cases we support, but\n // the selector can be expanded if it turns out to be too narrow.\n const modal = this._element.nativeElement.closest(\n 'body > .cdk-overlay-container [aria-modal=\"true\"]',\n );\n\n if (!modal) {\n // Most commonly, the autocomplete trigger is not inside a modal.\n return;\n }\n\n const panelId = this.autocomplete.id;\n\n if (this._trackedModal) {\n removeAriaReferencedId(this._trackedModal, 'aria-owns', panelId);\n }\n\n addAriaReferencedId(modal, 'aria-owns', panelId);\n this._trackedModal = modal;\n }\n\n /** Clears the references to the listbox overlay element from the modal it was added to. */\n private _clearFromModal() {\n if (this._trackedModal) {\n const panelId = this.autocomplete.id;\n\n removeAriaReferencedId(this._trackedModal, 'aria-owns', panelId);\n this._trackedModal = null;\n }\n }\n}\n","/**\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 {NgModule} from '@angular/core';\nimport {MatCommonModule, MatOptionModule} from '../core';\nimport {CdkScrollableModule} from '@angular/cdk/scrolling';\nimport {OverlayModule} from '@angular/cdk/overlay';\nimport {MatAutocomplete} from './autocomplete';\nimport {\n MatAutocompleteTrigger,\n MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER,\n} from './autocomplete-trigger';\nimport {MatAutocompleteOrigin} from './autocomplete-origin';\n\n@NgModule({\n imports: [\n OverlayModule,\n MatOptionModule,\n MatCommonModule,\n MatAutocomplete,\n MatAutocompleteTrigger,\n MatAutocompleteOrigin,\n ],\n exports: [\n CdkScrollableModule,\n MatAutocomplete,\n MatOptionModule,\n MatCommonModule,\n MatAutocompleteTrigger,\n MatAutocompleteOrigin,\n ],\n providers: [MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER],\n})\nexport class MatAutocompleteModule 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