app/node_modules/@angular/material/fesm2022/autocomplete.mjs

import { c as MAT_OPTION_PARENT_COMPONENT, M as MatOption, d as MAT_OPTGROUP, e as MatOptionSelectionChange, _ as _countGroupLabelsBeforeOption, b as _getOptionScrollPosition } from './option-ChV6uQgD.mjs';
export { a as MatOptgroup } from './option-ChV6uQgD.mjs';
import * as i0 from '@angular/core';
import { InjectionToken, inject, ChangeDetectorRef, ElementRef, ANIMATION_MODULE_TYPE, EventEmitter, booleanAttribute, TemplateRef, Component, ViewEncapsulation, ChangeDetectionStrategy, ViewChild, ContentChildren, Input, Output, Directive, forwardRef, EnvironmentInjector, ViewContainerRef, NgZone, Renderer2, afterNextRender, NgModule } from '@angular/core';
import { ViewportRuler, CdkScrollableModule } from '@angular/cdk/scrolling';
import { Overlay, OverlayConfig, OverlayModule } from '@angular/cdk/overlay';
import { _IdGenerator, ActiveDescendantKeyManager, removeAriaReferencedId, addAriaReferencedId } from '@angular/cdk/a11y';
import { Platform, _getFocusedElementPierceShadowDom, _getEventTarget } from '@angular/cdk/platform';
import { Subscription, Subject, merge, of, defer, Observable } from 'rxjs';
import { Directionality } from '@angular/cdk/bidi';
import { hasModifierKey, ESCAPE, ENTER, TAB, UP_ARROW, DOWN_ARROW } from '@angular/cdk/keycodes';
import { BreakpointObserver, Breakpoints } from '@angular/cdk/layout';
import { TemplatePortal } from '@angular/cdk/portal';
import { NG_VALUE_ACCESSOR } from '@angular/forms';
import { filter, map, startWith, switchMap, tap, delay, take } from 'rxjs/operators';
import { h as MAT_FORM_FIELD } from './form-field-DqPi4knt.mjs';
import { M as MatOptionModule } from './index-DOxJc1m4.mjs';
import { M as MatCommonModule } from './common-module-WayjW0Pb.mjs';
import './ripple-BT3tzh6F.mjs';
import '@angular/cdk/coercion';
import '@angular/cdk/private';
import './pseudo-checkbox-CJ7seqQH.mjs';
import './structural-styles-BQUT6wsL.mjs';
import '@angular/common';
import '@angular/cdk/observers/private';
import './index-SYVYjXwK.mjs';
import './pseudo-checkbox-module-CAX2sutq.mjs';

/** Event object that is emitted when an autocomplete option is selected. */
class MatAutocompleteSelectedEvent {
    source;
    option;
    constructor(
    /** Reference to the autocomplete panel that emitted the event. */
    source, 
    /** Option that was selected. */
    option) {
        this.source = source;
        this.option = option;
    }
}
/** Injection token to be used to override the default options for `mat-autocomplete`. */
const MAT_AUTOCOMPLETE_DEFAULT_OPTIONS = new InjectionToken('mat-autocomplete-default-options', {
    providedIn: 'root',
    factory: MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY,
});
/**
 * @docs-private
 * @deprecated No longer used, will be removed.
 * @breaking-change 21.0.0
 */
function MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY() {
    return {
        autoActiveFirstOption: false,
        autoSelectActiveOption: false,
        hideSingleSelectionIndicator: false,
        requireSelection: false,
        hasBackdrop: false,
    };
}
/** Autocomplete component. */
class MatAutocomplete {
    _changeDetectorRef = inject(ChangeDetectorRef);
    _elementRef = inject(ElementRef);
    _defaults = inject(MAT_AUTOCOMPLETE_DEFAULT_OPTIONS);
    _animationsDisabled = inject(ANIMATION_MODULE_TYPE, { optional: true }) === 'NoopAnimations';
    _activeOptionChanges = Subscription.EMPTY;
    /** Manages active item in option list based on key events. */
    _keyManager;
    /** Whether the autocomplete panel should be visible, depending on option length. */
    showPanel = false;
    /** Whether the autocomplete panel is open. */
    get isOpen() {
        return this._isOpen && this.showPanel;
    }
    _isOpen = false;
    /** Latest trigger that opened the autocomplete. */
    _latestOpeningTrigger;
    /** @docs-private Sets the theme color of the panel. */
    _setColor(value) {
        this._color = value;
        this._changeDetectorRef.markForCheck();
    }
    /** @docs-private theme color of the panel */
    _color;
    // The @ViewChild query for TemplateRef here needs to be static because some code paths
    // lead to the overlay being created before change detection has finished for this component.
    // Notably, another component may trigger `focus` on the autocomplete-trigger.
    /** @docs-private */
    template;
    /** Element for the panel containing the autocomplete options. */
    panel;
    /** Reference to all options within the autocomplete. */
    options;
    /** Reference to all option groups within the autocomplete. */
    optionGroups;
    /** Aria label of the autocomplete. */
    ariaLabel;
    /** Input that can be used to specify the `aria-labelledby` attribute. */
    ariaLabelledby;
    /** Function that maps an option's control value to its display value in the trigger. */
    displayWith = null;
    /**
     * Whether the first option should be highlighted when the autocomplete panel is opened.
     * Can be configured globally through the `MAT_AUTOCOMPLETE_DEFAULT_OPTIONS` token.
     */
    autoActiveFirstOption;
    /** Whether the active option should be selected as the user is navigating. */
    autoSelectActiveOption;
    /**
     * Whether the user is required to make a selection when they're interacting with the
     * autocomplete. If the user moves away from the autocomplete without selecting an option from
     * the list, the value will be reset. If the user opens the panel and closes it without
     * interacting or selecting a value, the initial value will be kept.
     */
    requireSelection;
    /**
     * Specify the width of the autocomplete panel.  Can be any CSS sizing value, otherwise it will
     * match the width of its host.
     */
    panelWidth;
    /** Whether ripples are disabled within the autocomplete panel. */
    disableRipple;
    /** Event that is emitted whenever an option from the list is selected. */
    optionSelected = new EventEmitter();
    /** Event that is emitted when the autocomplete panel is opened. */
    opened = new EventEmitter();
    /** Event that is emitted when the autocomplete panel is closed. */
    closed = new EventEmitter();
    /** Emits whenever an option is activated. */
    optionActivated = new EventEmitter();
    /**
     * Takes classes set on the host mat-autocomplete element and applies them to the panel
     * inside the overlay container to allow for easy styling.
     */
    set classList(value) {
        this._classList = value;
        this._elementRef.nativeElement.className = '';
    }
    _classList;
    /** Whether checkmark indicator for single-selection options is hidden. */
    get hideSingleSelectionIndicator() {
        return this._hideSingleSelectionIndicator;
    }
    set hideSingleSelectionIndicator(value) {
        this._hideSingleSelectionIndicator = value;
        this._syncParentProperties();
    }
    _hideSingleSelectionIndicator;
    /** Syncs the parent state with the individual options. */
    _syncParentProperties() {
        if (this.options) {
            for (const option of this.options) {
                option._changeDetectorRef.markForCheck();
            }
        }
    }
    /** Unique ID to be used by autocomplete trigger's "aria-owns" property. */
    id = inject(_IdGenerator).getId('mat-autocomplete-');
    /**
     * Tells any descendant `mat-optgroup` to use the inert a11y pattern.
     * @docs-private
     */
    inertGroups;
    constructor() {
        const platform = inject(Platform);
        // TODO(crisbeto): the problem that the `inertGroups` option resolves is only present on
        // Safari using VoiceOver. We should occasionally check back to see whether the bug
        // wasn't resolved in VoiceOver, and if it has, we can remove this and the `inertGroups`
        // option altogether.
        this.inertGroups = platform?.SAFARI || false;
        this.autoActiveFirstOption = !!this._defaults.autoActiveFirstOption;
        this.autoSelectActiveOption = !!this._defaults.autoSelectActiveOption;
        this.requireSelection = !!this._defaults.requireSelection;
        this._hideSingleSelectionIndicator = this._defaults.hideSingleSelectionIndicator ?? false;
    }
    ngAfterContentInit() {
        this._keyManager = new ActiveDescendantKeyManager(this.options)
            .withWrap()
            .skipPredicate(this._skipPredicate);
        this._activeOptionChanges = this._keyManager.change.subscribe(index => {
            if (this.isOpen) {
                this.optionActivated.emit({ source: this, option: this.options.toArray()[index] || null });
            }
        });
        // Set the initial visibility state.
        this._setVisibility();
    }
    ngOnDestroy() {
        this._keyManager?.destroy();
        this._activeOptionChanges.unsubscribe();
    }
    /**
     * Sets the panel scrollTop. This allows us to manually scroll to display options
     * above or below the fold, as they are not actually being focused when active.
     */
    _setScrollTop(scrollTop) {
        if (this.panel) {
            this.panel.nativeElement.scrollTop = scrollTop;
        }
    }
    /** Returns the panel's scrollTop. */
    _getScrollTop() {
        return this.panel ? this.panel.nativeElement.scrollTop : 0;
    }
    /** Panel should hide itself when the option list is empty. */
    _setVisibility() {
        this.showPanel = !!this.options?.length;
        this._changeDetectorRef.markForCheck();
    }
    /** Emits the `select` event. */
    _emitSelectEvent(option) {
        const event = new MatAutocompleteSelectedEvent(this, option);
        this.optionSelected.emit(event);
    }
    /** Gets the aria-labelledby for the autocomplete panel. */
    _getPanelAriaLabelledby(labelId) {
        if (this.ariaLabel) {
            return null;
        }
        const labelExpression = labelId ? labelId + ' ' : '';
        return this.ariaLabelledby ? labelExpression + this.ariaLabelledby : labelId;
    }
    // `skipPredicate` determines if key manager should avoid putting a given option in the tab
    // order. Allow disabled list items to receive focus via keyboard to align with WAI ARIA
    // recommendation.
    //
    // Normally WAI ARIA's instructions are to exclude disabled items from the tab order, but it
    // makes a few exceptions for compound widgets.
    //
    // From [Developing a Keyboard Interface](
    // https://www.w3.org/WAI/ARIA/apg/practices/keyboard-interface/):
    //   "For the following composite widget elements, keep them focusable when disabled: Options in a
    //   Listbox..."
    //
    // The user can focus disabled options using the keyboard, but the user cannot click disabled
    // options.
    _skipPredicate() {
        return false;
    }
    static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocomplete, deps: [], target: i0.ɵɵFactoryTarget.Component });
    static ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "16.1.0", version: "19.2.6", type: MatAutocomplete, isStandalone: true, selector: "mat-autocomplete", inputs: { ariaLabel: ["aria-label", "ariaLabel"], ariaLabelledby: ["aria-labelledby", "ariaLabelledby"], displayWith: "displayWith", autoActiveFirstOption: ["autoActiveFirstOption", "autoActiveFirstOption", booleanAttribute], autoSelectActiveOption: ["autoSelectActiveOption", "autoSelectActiveOption", booleanAttribute], requireSelection: ["requireSelection", "requireSelection", booleanAttribute], panelWidth: "panelWidth", disableRipple: ["disableRipple", "disableRipple", booleanAttribute], classList: ["class", "classList"], hideSingleSelectionIndicator: ["hideSingleSelectionIndicator", "hideSingleSelectionIndicator", booleanAttribute] }, outputs: { optionSelected: "optionSelected", opened: "opened", closed: "closed", optionActivated: "optionActivated" }, host: { classAttribute: "mat-mdc-autocomplete" }, providers: [{ provide: MAT_OPTION_PARENT_COMPONENT, useExisting: MatAutocomplete }], queries: [{ propertyName: "options", predicate: MatOption, descendants: true }, { propertyName: "optionGroups", predicate: MAT_OPTGROUP, descendants: true }], viewQueries: [{ propertyName: "template", first: true, predicate: TemplateRef, descendants: true, static: true }, { propertyName: "panel", first: true, predicate: ["panel"], descendants: true }], exportAs: ["matAutocomplete"], ngImport: i0, template: "<ng-template let-formFieldId=\"id\">\n  <div\n    class=\"mat-mdc-autocomplete-panel mdc-menu-surface mdc-menu-surface--open\"\n    role=\"listbox\"\n    [id]=\"id\"\n    [class]=\"_classList\"\n    [class.mat-mdc-autocomplete-visible]=\"showPanel\"\n    [class.mat-mdc-autocomplete-hidden]=\"!showPanel\"\n    [class.mat-autocomplete-panel-animations-enabled]=\"!_animationsDisabled\"\n    [class.mat-primary]=\"_color === 'primary'\"\n    [class.mat-accent]=\"_color === 'accent'\"\n    [class.mat-warn]=\"_color === 'warn'\"\n    [attr.aria-label]=\"ariaLabel || null\"\n    [attr.aria-labelledby]=\"_getPanelAriaLabelledby(formFieldId)\"\n    #panel>\n    <ng-content></ng-content>\n  </div>\n</ng-template>\n", styles: ["div.mat-mdc-autocomplete-panel{width:100%;max-height:256px;visibility:hidden;transform-origin:center top;overflow:auto;padding:8px 0;box-sizing:border-box;position:relative;border-radius:var(--mat-autocomplete-container-shape, var(--mat-sys-corner-extra-small));box-shadow:var(--mat-autocomplete-container-elevation-shadow, 0px 3px 1px -2px rgba(0, 0, 0, 0.2), 0px 2px 2px 0px rgba(0, 0, 0, 0.14), 0px 1px 5px 0px rgba(0, 0, 0, 0.12));background-color:var(--mat-autocomplete-background-color, var(--mat-sys-surface-container))}@media(forced-colors: active){div.mat-mdc-autocomplete-panel{outline:solid 1px}}.cdk-overlay-pane:not(.mat-mdc-autocomplete-panel-above) div.mat-mdc-autocomplete-panel{border-top-left-radius:0;border-top-right-radius:0}.mat-mdc-autocomplete-panel-above div.mat-mdc-autocomplete-panel{border-bottom-left-radius:0;border-bottom-right-radius:0;transform-origin:center bottom}div.mat-mdc-autocomplete-panel.mat-mdc-autocomplete-visible{visibility:visible}div.mat-mdc-autocomplete-panel.mat-mdc-autocomplete-hidden{visibility:hidden;pointer-events:none}@keyframes _mat-autocomplete-enter{from{opacity:0;transform:scaleY(0.8)}to{opacity:1;transform:none}}.mat-autocomplete-panel-animations-enabled{animation:_mat-autocomplete-enter 120ms cubic-bezier(0, 0, 0.2, 1)}mat-autocomplete{display:none}\n"], changeDetection: i0.ChangeDetectionStrategy.OnPush, encapsulation: i0.ViewEncapsulation.None });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocomplete, decorators: [{
            type: Component,
            args: [{ selector: 'mat-autocomplete', encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.OnPush, exportAs: 'matAutocomplete', host: {
                        'class': 'mat-mdc-autocomplete',
                    }, providers: [{ provide: MAT_OPTION_PARENT_COMPONENT, useExisting: MatAutocomplete }], template: "<ng-template let-formFieldId=\"id\">\n  <div\n    class=\"mat-mdc-autocomplete-panel mdc-menu-surface mdc-menu-surface--open\"\n    role=\"listbox\"\n    [id]=\"id\"\n    [class]=\"_classList\"\n    [class.mat-mdc-autocomplete-visible]=\"showPanel\"\n    [class.mat-mdc-autocomplete-hidden]=\"!showPanel\"\n    [class.mat-autocomplete-panel-animations-enabled]=\"!_animationsDisabled\"\n    [class.mat-primary]=\"_color === 'primary'\"\n    [class.mat-accent]=\"_color === 'accent'\"\n    [class.mat-warn]=\"_color === 'warn'\"\n    [attr.aria-label]=\"ariaLabel || null\"\n    [attr.aria-labelledby]=\"_getPanelAriaLabelledby(formFieldId)\"\n    #panel>\n    <ng-content></ng-content>\n  </div>\n</ng-template>\n", styles: ["div.mat-mdc-autocomplete-panel{width:100%;max-height:256px;visibility:hidden;transform-origin:center top;overflow:auto;padding:8px 0;box-sizing:border-box;position:relative;border-radius:var(--mat-autocomplete-container-shape, var(--mat-sys-corner-extra-small));box-shadow:var(--mat-autocomplete-container-elevation-shadow, 0px 3px 1px -2px rgba(0, 0, 0, 0.2), 0px 2px 2px 0px rgba(0, 0, 0, 0.14), 0px 1px 5px 0px rgba(0, 0, 0, 0.12));background-color:var(--mat-autocomplete-background-color, var(--mat-sys-surface-container))}@media(forced-colors: active){div.mat-mdc-autocomplete-panel{outline:solid 1px}}.cdk-overlay-pane:not(.mat-mdc-autocomplete-panel-above) div.mat-mdc-autocomplete-panel{border-top-left-radius:0;border-top-right-radius:0}.mat-mdc-autocomplete-panel-above div.mat-mdc-autocomplete-panel{border-bottom-left-radius:0;border-bottom-right-radius:0;transform-origin:center bottom}div.mat-mdc-autocomplete-panel.mat-mdc-autocomplete-visible{visibility:visible}div.mat-mdc-autocomplete-panel.mat-mdc-autocomplete-hidden{visibility:hidden;pointer-events:none}@keyframes _mat-autocomplete-enter{from{opacity:0;transform:scaleY(0.8)}to{opacity:1;transform:none}}.mat-autocomplete-panel-animations-enabled{animation:_mat-autocomplete-enter 120ms cubic-bezier(0, 0, 0.2, 1)}mat-autocomplete{display:none}\n"] }]
        }], ctorParameters: () => [], propDecorators: { template: [{
                type: ViewChild,
                args: [TemplateRef, { static: true }]
            }], panel: [{
                type: ViewChild,
                args: ['panel']
            }], options: [{
                type: ContentChildren,
                args: [MatOption, { descendants: true }]
            }], optionGroups: [{
                type: ContentChildren,
                args: [MAT_OPTGROUP, { descendants: true }]
            }], ariaLabel: [{
                type: Input,
                args: ['aria-label']
            }], ariaLabelledby: [{
                type: Input,
                args: ['aria-labelledby']
            }], displayWith: [{
                type: Input
            }], autoActiveFirstOption: [{
                type: Input,
                args: [{ transform: booleanAttribute }]
            }], autoSelectActiveOption: [{
                type: Input,
                args: [{ transform: booleanAttribute }]
            }], requireSelection: [{
                type: Input,
                args: [{ transform: booleanAttribute }]
            }], panelWidth: [{
                type: Input
            }], disableRipple: [{
                type: Input,
                args: [{ transform: booleanAttribute }]
            }], optionSelected: [{
                type: Output
            }], opened: [{
                type: Output
            }], closed: [{
                type: Output
            }], optionActivated: [{
                type: Output
            }], classList: [{
                type: Input,
                args: ['class']
            }], hideSingleSelectionIndicator: [{
                type: Input,
                args: [{ transform: booleanAttribute }]
            }] } });

/**
 * Directive applied to an element to make it usable
 * as a connection point for an autocomplete panel.
 */
class MatAutocompleteOrigin {
    elementRef = inject(ElementRef);
    constructor() { }
    static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocompleteOrigin, deps: [], target: i0.ɵɵFactoryTarget.Directive });
    static ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "19.2.6", type: MatAutocompleteOrigin, isStandalone: true, selector: "[matAutocompleteOrigin]", exportAs: ["matAutocompleteOrigin"], ngImport: i0 });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocompleteOrigin, decorators: [{
            type: Directive,
            args: [{
                    selector: '[matAutocompleteOrigin]',
                    exportAs: 'matAutocompleteOrigin',
                }]
        }], ctorParameters: () => [] });

/**
 * Provider that allows the autocomplete to register as a ControlValueAccessor.
 * @docs-private
 */
const MAT_AUTOCOMPLETE_VALUE_ACCESSOR = {
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef(() => MatAutocompleteTrigger),
    multi: true,
};
/**
 * Creates an error to be thrown when attempting to use an autocomplete trigger without a panel.
 * @docs-private
 */
function getMatAutocompleteMissingPanelError() {
    return Error('Attempting to open an undefined instance of `mat-autocomplete`. ' +
        'Make sure that the id passed to the `matAutocomplete` is correct and that ' +
        "you're attempting to open it after the ngAfterContentInit hook.");
}
/** Injection token that determines the scroll handling while the autocomplete panel is open. */
const MAT_AUTOCOMPLETE_SCROLL_STRATEGY = new InjectionToken('mat-autocomplete-scroll-strategy', {
    providedIn: 'root',
    factory: () => {
        const overlay = inject(Overlay);
        return () => overlay.scrollStrategies.reposition();
    },
});
/**
 * @docs-private
 * @deprecated No longer used, will be removed.
 * @breaking-change 21.0.0
 */
function MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY(overlay) {
    return () => overlay.scrollStrategies.reposition();
}
/**
 * @docs-private
 * @deprecated No longer used, will be removed.
 * @breaking-change 21.0.0
 */
const MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER = {
    provide: MAT_AUTOCOMPLETE_SCROLL_STRATEGY,
    deps: [Overlay],
    useFactory: MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY,
};
/** Base class with all of the `MatAutocompleteTrigger` functionality. */
class MatAutocompleteTrigger {
    _environmentInjector = inject(EnvironmentInjector);
    _element = inject(ElementRef);
    _overlay = inject(Overlay);
    _viewContainerRef = inject(ViewContainerRef);
    _zone = inject(NgZone);
    _changeDetectorRef = inject(ChangeDetectorRef);
    _dir = inject(Directionality, { optional: true });
    _formField = inject(MAT_FORM_FIELD, { optional: true, host: true });
    _viewportRuler = inject(ViewportRuler);
    _scrollStrategy = inject(MAT_AUTOCOMPLETE_SCROLL_STRATEGY);
    _renderer = inject(Renderer2);
    _defaults = inject(MAT_AUTOCOMPLETE_DEFAULT_OPTIONS, { optional: true });
    _overlayRef;
    _portal;
    _componentDestroyed = false;
    _initialized = new Subject();
    _keydownSubscription;
    _outsideClickSubscription;
    _cleanupWindowBlur;
    /** Old value of the native input. Used to work around issues with the `input` event on IE. */
    _previousValue;
    /** Value of the input element when the panel was attached (even if there are no options). */
    _valueOnAttach;
    /** Value on the previous keydown event. */
    _valueOnLastKeydown;
    /** Strategy that is used to position the panel. */
    _positionStrategy;
    /** Whether or not the label state is being overridden. */
    _manuallyFloatingLabel = false;
    /** The subscription for closing actions (some are bound to document). */
    _closingActionsSubscription;
    /** Subscription to viewport size changes. */
    _viewportSubscription = Subscription.EMPTY;
    /** Implements BreakpointObserver to be used to detect handset landscape */
    _breakpointObserver = inject(BreakpointObserver);
    _handsetLandscapeSubscription = Subscription.EMPTY;
    /**
     * Whether the autocomplete can open the next time it is focused. Used to prevent a focused,
     * closed autocomplete from being reopened if the user switches to another browser tab and then
     * comes back.
     */
    _canOpenOnNextFocus = true;
    /** Value inside the input before we auto-selected an option. */
    _valueBeforeAutoSelection;
    /**
     * Current option that we have auto-selected as the user is navigating,
     * but which hasn't been propagated to the model value yet.
     */
    _pendingAutoselectedOption;
    /** Stream of keyboard events that can close the panel. */
    _closeKeyEventStream = new Subject();
    /**
     * Event handler for when the window is blurred. Needs to be an
     * arrow function in order to preserve the context.
     */
    _windowBlurHandler = () => {
        // If the user blurred the window while the autocomplete is focused, it means that it'll be
        // refocused when they come back. In this case we want to skip the first focus event, if the
        // pane was closed, in order to avoid reopening it unintentionally.
        this._canOpenOnNextFocus = this.panelOpen || !this._hasFocus();
    };
    /** `View -> model callback called when value changes` */
    _onChange = () => { };
    /** `View -> model callback called when autocomplete has been touched` */
    _onTouched = () => { };
    /** The autocomplete panel to be attached to this trigger. */
    autocomplete;
    /**
     * Position of the autocomplete panel relative to the trigger element. A position of `auto`
     * will render the panel underneath the trigger if there is enough space for it to fit in
     * the viewport, otherwise the panel will be shown above it. If the position is set to
     * `above` or `below`, the panel will always be shown above or below the trigger. no matter
     * whether it fits completely in the viewport.
     */
    position = 'auto';
    /**
     * Reference relative to which to position the autocomplete panel.
     * Defaults to the autocomplete trigger element.
     */
    connectedTo;
    /**
     * `autocomplete` attribute to be set on the input element.
     * @docs-private
     */
    autocompleteAttribute = 'off';
    /**
     * Whether the autocomplete is disabled. When disabled, the element will
     * act as a regular input and the user won't be able to open the panel.
     */
    autocompleteDisabled;
    constructor() { }
    /** Class to apply to the panel when it's above the input. */
    _aboveClass = 'mat-mdc-autocomplete-panel-above';
    ngAfterViewInit() {
        this._initialized.next();
        this._initialized.complete();
        this._cleanupWindowBlur = this._renderer.listen('window', 'blur', this._windowBlurHandler);
    }
    ngOnChanges(changes) {
        if (changes['position'] && this._positionStrategy) {
            this._setStrategyPositions(this._positionStrategy);
            if (this.panelOpen) {
                this._overlayRef.updatePosition();
            }
        }
    }
    ngOnDestroy() {
        this._cleanupWindowBlur?.();
        this._handsetLandscapeSubscription.unsubscribe();
        this._viewportSubscription.unsubscribe();
        this._componentDestroyed = true;
        this._destroyPanel();
        this._closeKeyEventStream.complete();
        this._clearFromModal();
    }
    /** Whether or not the autocomplete panel is open. */
    get panelOpen() {
        return this._overlayAttached && this.autocomplete.showPanel;
    }
    _overlayAttached = false;
    /** Opens the autocomplete suggestion panel. */
    openPanel() {
        this._openPanelInternal();
    }
    /** Closes the autocomplete suggestion panel. */
    closePanel() {
        this._resetLabel();
        if (!this._overlayAttached) {
            return;
        }
        if (this.panelOpen) {
            // Only emit if the panel was visible.
            // `afterNextRender` always runs outside of the Angular zone, so all the subscriptions from
            // `_subscribeToClosingActions()` are also outside of the Angular zone.
            // We should manually run in Angular zone to update UI after panel closing.
            this._zone.run(() => {
                this.autocomplete.closed.emit();
            });
        }
        // Only reset if this trigger is the latest one that opened the
        // autocomplete since another may have taken it over.
        if (this.autocomplete._latestOpeningTrigger === this) {
            this.autocomplete._isOpen = false;
            this.autocomplete._latestOpeningTrigger = null;
        }
        this._overlayAttached = false;
        this._pendingAutoselectedOption = null;
        if (this._overlayRef && this._overlayRef.hasAttached()) {
            this._overlayRef.detach();
            this._closingActionsSubscription.unsubscribe();
        }
        this._updatePanelState();
        // Note that in some cases this can end up being called after the component is destroyed.
        // Add a check to ensure that we don't try to run change detection on a destroyed view.
        if (!this._componentDestroyed) {
            // We need to trigger change detection manually, because
            // `fromEvent` doesn't seem to do it at the proper time.
            // This ensures that the label is reset when the
            // user clicks outside.
            this._changeDetectorRef.detectChanges();
        }
        // Remove aria-owns attribute when the autocomplete is no longer visible.
        if (this._trackedModal) {
            removeAriaReferencedId(this._trackedModal, 'aria-owns', this.autocomplete.id);
        }
    }
    /**
     * Updates the position of the autocomplete suggestion panel to ensure that it fits all options
     * within the viewport.
     */
    updatePosition() {
        if (this._overlayAttached) {
            this._overlayRef.updatePosition();
        }
    }
    /**
     * A stream of actions that should close the autocomplete panel, including
     * when an option is selected, on blur, and when TAB is pressed.
     */
    get panelClosingActions() {
        return merge(this.optionSelections, this.autocomplete._keyManager.tabOut.pipe(filter(() => this._overlayAttached)), this._closeKeyEventStream, this._getOutsideClickStream(), this._overlayRef
            ? this._overlayRef.detachments().pipe(filter(() => this._overlayAttached))
            : of()).pipe(
        // Normalize the output so we return a consistent type.
        map(event => (event instanceof MatOptionSelectionChange ? event : null)));
    }
    /** Stream of changes to the selection state of the autocomplete options. */
    optionSelections = defer(() => {
        const options = this.autocomplete ? this.autocomplete.options : null;
        if (options) {
            return options.changes.pipe(startWith(options), switchMap(() => merge(...options.map(option => option.onSelectionChange))));
        }
        // If there are any subscribers before `ngAfterViewInit`, the `autocomplete` will be undefined.
        // Return a stream that we'll replace with the real one once everything is in place.
        return this._initialized.pipe(switchMap(() => this.optionSelections));
    });
    /** The currently active option, coerced to MatOption type. */
    get activeOption() {
        if (this.autocomplete && this.autocomplete._keyManager) {
            return this.autocomplete._keyManager.activeItem;
        }
        return null;
    }
    /** Stream of clicks outside of the autocomplete panel. */
    _getOutsideClickStream() {
        return new Observable(observer => {
            const listener = (event) => {
                // If we're in the Shadow DOM, the event target will be the shadow root, so we have to
                // fall back to check the first element in the path of the click event.
                const clickTarget = _getEventTarget(event);
                const formField = this._formField
                    ? this._formField.getConnectedOverlayOrigin().nativeElement
                    : null;
                const customOrigin = this.connectedTo ? this.connectedTo.elementRef.nativeElement : null;
                if (this._overlayAttached &&
                    clickTarget !== this._element.nativeElement &&
                    // Normally focus moves inside `mousedown` so this condition will almost always be
                    // true. Its main purpose is to handle the case where the input is focused from an
                    // outside click which propagates up to the `body` listener within the same sequence
                    // and causes the panel to close immediately (see #3106).
                    !this._hasFocus() &&
                    (!formField || !formField.contains(clickTarget)) &&
                    (!customOrigin || !customOrigin.contains(clickTarget)) &&
                    !!this._overlayRef &&
                    !this._overlayRef.overlayElement.contains(clickTarget)) {
                    observer.next(event);
                }
            };
            const cleanups = [
                this._renderer.listen('document', 'click', listener),
                this._renderer.listen('document', 'auxclick', listener),
                this._renderer.listen('document', 'touchend', listener),
            ];
            return () => {
                cleanups.forEach(current => current());
            };
        });
    }
    // Implemented as part of ControlValueAccessor.
    writeValue(value) {
        Promise.resolve(null).then(() => this._assignOptionValue(value));
    }
    // Implemented as part of ControlValueAccessor.
    registerOnChange(fn) {
        this._onChange = fn;
    }
    // Implemented as part of ControlValueAccessor.
    registerOnTouched(fn) {
        this._onTouched = fn;
    }
    // Implemented as part of ControlValueAccessor.
    setDisabledState(isDisabled) {
        this._element.nativeElement.disabled = isDisabled;
    }
    _handleKeydown(event) {
        const keyCode = event.keyCode;
        const hasModifier = hasModifierKey(event);
        // Prevent the default action on all escape key presses. This is here primarily to bring IE
        // in line with other browsers. By default, pressing escape on IE will cause it to revert
        // the input value to the one that it had on focus, however it won't dispatch any events
        // which means that the model value will be out of sync with the view.
        if (keyCode === ESCAPE && !hasModifier) {
            event.preventDefault();
        }
        this._valueOnLastKeydown = this._element.nativeElement.value;
        if (this.activeOption && keyCode === ENTER && this.panelOpen && !hasModifier) {
            this.activeOption._selectViaInteraction();
            this._resetActiveItem();
            event.preventDefault();
        }
        else if (this.autocomplete) {
            const prevActiveItem = this.autocomplete._keyManager.activeItem;
            const isArrowKey = keyCode === UP_ARROW || keyCode === DOWN_ARROW;
            if (keyCode === TAB || (isArrowKey && !hasModifier && this.panelOpen)) {
                this.autocomplete._keyManager.onKeydown(event);
            }
            else if (isArrowKey && this._canOpen()) {
                this._openPanelInternal(this._valueOnLastKeydown);
            }
            if (isArrowKey || this.autocomplete._keyManager.activeItem !== prevActiveItem) {
                this._scrollToOption(this.autocomplete._keyManager.activeItemIndex || 0);
                if (this.autocomplete.autoSelectActiveOption && this.activeOption) {
                    if (!this._pendingAutoselectedOption) {
                        this._valueBeforeAutoSelection = this._valueOnLastKeydown;
                    }
                    this._pendingAutoselectedOption = this.activeOption;
                    this._assignOptionValue(this.activeOption.value);
                }
            }
        }
    }
    _handleInput(event) {
        let target = event.target;
        let value = target.value;
        // Based on `NumberValueAccessor` from forms.
        if (target.type === 'number') {
            value = value == '' ? null : parseFloat(value);
        }
        // If the input has a placeholder, IE will fire the `input` event on page load,
        // focus and blur, in addition to when the user actually changed the value. To
        // filter out all of the extra events, we save the value on focus and between
        // `input` events, and we check whether it changed.
        // See: https://connect.microsoft.com/IE/feedback/details/885747/
        if (this._previousValue !== value) {
            this._previousValue = value;
            this._pendingAutoselectedOption = null;
            // If selection is required we don't write to the CVA while the user is typing.
            // At the end of the selection either the user will have picked something
            // or we'll reset the value back to null.
            if (!this.autocomplete || !this.autocomplete.requireSelection) {
                this._onChange(value);
            }
            if (!value) {
                this._clearPreviousSelectedOption(null, false);
            }
            else if (this.panelOpen && !this.autocomplete.requireSelection) {
                // Note that we don't reset this when `requireSelection` is enabled,
                // because the option will be reset when the panel is closed.
                const selectedOption = this.autocomplete.options?.find(option => option.selected);
                if (selectedOption) {
                    const display = this._getDisplayValue(selectedOption.value);
                    if (value !== display) {
                        selectedOption.deselect(false);
                    }
                }
            }
            if (this._canOpen() && this._hasFocus()) {
                // When the `input` event fires, the input's value will have already changed. This means
                // that if we take the `this._element.nativeElement.value` directly, it'll be one keystroke
                // behind. This can be a problem when the user selects a value, changes a character while
                // the input still has focus and then clicks away (see #28432). To work around it, we
                // capture the value in `keydown` so we can use it here.
                const valueOnAttach = this._valueOnLastKeydown ?? this._element.nativeElement.value;
                this._valueOnLastKeydown = null;
                this._openPanelInternal(valueOnAttach);
            }
        }
    }
    _handleFocus() {
        if (!this._canOpenOnNextFocus) {
            this._canOpenOnNextFocus = true;
        }
        else if (this._canOpen()) {
            this._previousValue = this._element.nativeElement.value;
            this._attachOverlay(this._previousValue);
            this._floatLabel(true);
        }
    }
    _handleClick() {
        if (this._canOpen() && !this.panelOpen) {
            this._openPanelInternal();
        }
    }
    /** Whether the input currently has focus. */
    _hasFocus() {
        return _getFocusedElementPierceShadowDom() === this._element.nativeElement;
    }
    /**
     * In "auto" mode, the label will animate down as soon as focus is lost.
     * This causes the value to jump when selecting an option with the mouse.
     * This method manually floats the label until the panel can be closed.
     * @param shouldAnimate Whether the label should be animated when it is floated.
     */
    _floatLabel(shouldAnimate = false) {
        if (this._formField && this._formField.floatLabel === 'auto') {
            if (shouldAnimate) {
                this._formField._animateAndLockLabel();
            }
            else {
                this._formField.floatLabel = 'always';
            }
            this._manuallyFloatingLabel = true;
        }
    }
    /** If the label has been manually elevated, return it to its normal state. */
    _resetLabel() {
        if (this._manuallyFloatingLabel) {
            if (this._formField) {
                this._formField.floatLabel = 'auto';
            }
            this._manuallyFloatingLabel = false;
        }
    }
    /**
     * This method listens to a stream of panel closing actions and resets the
     * stream every time the option list changes.
     */
    _subscribeToClosingActions() {
        const initialRender = new Observable(subscriber => {
            afterNextRender(() => {
                subscriber.next();
            }, { injector: this._environmentInjector });
        });
        const optionChanges = this.autocomplete.options?.changes.pipe(tap(() => this._positionStrategy.reapplyLastPosition()), 
        // Defer emitting to the stream until the next tick, because changing
        // bindings in here will cause "changed after checked" errors.
        delay(0)) ?? of();
        // When the options are initially rendered, and when the option list changes...
        return (merge(initialRender, optionChanges)
            .pipe(
        // create a new stream of panelClosingActions, replacing any previous streams
        // that were created, and flatten it so our stream only emits closing events...
        switchMap(() => this._zone.run(() => {
            // `afterNextRender` always runs outside of the Angular zone, thus we have to re-enter
            // the Angular zone. This will lead to change detection being called outside of the Angular
            // zone and the `autocomplete.opened` will also emit outside of the Angular.
            const wasOpen = this.panelOpen;
            this._resetActiveItem();
            this._updatePanelState();
            this._changeDetectorRef.detectChanges();
            if (this.panelOpen) {
                this._overlayRef.updatePosition();
            }
            if (wasOpen !== this.panelOpen) {
                // If the `panelOpen` state changed, we need to make sure to emit the `opened` or
                // `closed` event, because we may not have emitted it. This can happen
                // - if the users opens the panel and there are no options, but the
                //   options come in slightly later or as a result of the value changing,
                // - if the panel is closed after the user entered a string that did not match any
                //   of the available options,
                // - if a valid string is entered after an invalid one.
                if (this.panelOpen) {
                    this._emitOpened();
                }
                else {
                    this.autocomplete.closed.emit();
                }
            }
            return this.panelClosingActions;
        })), 
        // when the first closing event occurs...
        take(1))
            // set the value, close the panel, and complete.
            .subscribe(event => this._setValueAndClose(event)));
    }
    /**
     * Emits the opened event once it's known that the panel will be shown and stores
     * the state of the trigger right before the opening sequence was finished.
     */
    _emitOpened() {
        this.autocomplete.opened.emit();
    }
    /** Destroys the autocomplete suggestion panel. */
    _destroyPanel() {
        if (this._overlayRef) {
            this.closePanel();
            this._overlayRef.dispose();
            this._overlayRef = null;
        }
    }
    /** Given a value, returns the string that should be shown within the input. */
    _getDisplayValue(value) {
        const autocomplete = this.autocomplete;
        return autocomplete && autocomplete.displayWith ? autocomplete.displayWith(value) : value;
    }
    _assignOptionValue(value) {
        const toDisplay = this._getDisplayValue(value);
        if (value == null) {
            this._clearPreviousSelectedOption(null, false);
        }
        // Simply falling back to an empty string if the display value is falsy does not work properly.
        // The display value can also be the number zero and shouldn't fall back to an empty string.
        this._updateNativeInputValue(toDisplay != null ? toDisplay : '');
    }
    _updateNativeInputValue(value) {
        // If it's used within a `MatFormField`, we should set it through the property so it can go
        // through change detection.
        if (this._formField) {
            this._formField._control.value = value;
        }
        else {
            this._element.nativeElement.value = value;
        }
        this._previousValue = value;
    }
    /**
     * This method closes the panel, and if a value is specified, also sets the associated
     * control to that value. It will also mark the control as dirty if this interaction
     * stemmed from the user.
     */
    _setValueAndClose(event) {
        const panel = this.autocomplete;
        const toSelect = event ? event.source : this._pendingAutoselectedOption;
        if (toSelect) {
            this._clearPreviousSelectedOption(toSelect);
            this._assignOptionValue(toSelect.value);
            // TODO(crisbeto): this should wait until the animation is done, otherwise the value
            // gets reset while the panel is still animating which looks glitchy. It'll likely break
            // some tests to change it at this point.
            this._onChange(toSelect.value);
            panel._emitSelectEvent(toSelect);
            this._element.nativeElement.focus();
        }
        else if (panel.requireSelection &&
            this._element.nativeElement.value !== this._valueOnAttach) {
            this._clearPreviousSelectedOption(null);
            this._assignOptionValue(null);
            this._onChange(null);
        }
        this.closePanel();
    }
    /**
     * Clear any previous selected option and emit a selection change event for this option
     */
    _clearPreviousSelectedOption(skip, emitEvent) {
        // Null checks are necessary here, because the autocomplete
        // or its options may not have been assigned yet.
        this.autocomplete?.options?.forEach(option => {
            if (option !== skip && option.selected) {
                option.deselect(emitEvent);
            }
        });
    }
    _openPanelInternal(valueOnAttach = this._element.nativeElement.value) {
        this._attachOverlay(valueOnAttach);
        this._floatLabel();
        // Add aria-owns attribute when the autocomplete becomes visible.
        if (this._trackedModal) {
            const panelId = this.autocomplete.id;
            addAriaReferencedId(this._trackedModal, 'aria-owns', panelId);
        }
    }
    _attachOverlay(valueOnAttach) {
        if (!this.autocomplete && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getMatAutocompleteMissingPanelError();
        }
        let overlayRef = this._overlayRef;
        if (!overlayRef) {
            this._portal = new TemplatePortal(this.autocomplete.template, this._viewContainerRef, {
                id: this._formField?.getLabelId(),
            });
            overlayRef = this._overlay.create(this._getOverlayConfig());
            this._overlayRef = overlayRef;
            this._viewportSubscription = this._viewportRuler.change().subscribe(() => {
                if (this.panelOpen && overlayRef) {
                    overlayRef.updateSize({ width: this._getPanelWidth() });
                }
            });
            // Subscribe to the breakpoint events stream to detect when screen is in
            // handsetLandscape.
            this._handsetLandscapeSubscription = this._breakpointObserver
                .observe(Breakpoints.HandsetLandscape)
                .subscribe(result => {
                const isHandsetLandscape = result.matches;
                // Check if result.matches Breakpoints.HandsetLandscape. Apply HandsetLandscape
                // settings to prevent overlay cutoff in that breakpoint. Fixes b/284148377
                if (isHandsetLandscape) {
                    this._positionStrategy
                        .withFlexibleDimensions(true)
                        .withGrowAfterOpen(true)
                        .withViewportMargin(8);
                }
                else {
                    this._positionStrategy
                        .withFlexibleDimensions(false)
                        .withGrowAfterOpen(false)
                        .withViewportMargin(0);
                }
            });
        }
        else {
            // Update the trigger, panel width and direction, in case anything has changed.
            this._positionStrategy.setOrigin(this._getConnectedElement());
            overlayRef.updateSize({ width: this._getPanelWidth() });
        }
        if (overlayRef && !overlayRef.hasAttached()) {
            overlayRef.attach(this._portal);
            this._valueOnAttach = valueOnAttach;
            this._valueOnLastKeydown = null;
            this._closingActionsSubscription = this._subscribeToClosingActions();
        }
        const wasOpen = this.panelOpen;
        this.autocomplete._isOpen = this._overlayAttached = true;
        this.autocomplete._latestOpeningTrigger = this;
        this.autocomplete._setColor(this._formField?.color);
        this._updatePanelState();
        this._applyModalPanelOwnership();
        // We need to do an extra `panelOpen` check in here, because the
        // autocomplete won't be shown if there are no options.
        if (this.panelOpen && wasOpen !== this.panelOpen) {
            this._emitOpened();
        }
    }
    /** Handles keyboard events coming from the overlay panel. */
    _handlePanelKeydown = (event) => {
        // Close when pressing ESCAPE or ALT + UP_ARROW, based on the a11y guidelines.
        // See: https://www.w3.org/TR/wai-aria-practices-1.1/#textbox-keyboard-interaction
        if ((event.keyCode === ESCAPE && !hasModifierKey(event)) ||
            (event.keyCode === UP_ARROW && hasModifierKey(event, 'altKey'))) {
            // If the user had typed something in before we autoselected an option, and they decided
            // to cancel the selection, restore the input value to the one they had typed in.
            if (this._pendingAutoselectedOption) {
                this._updateNativeInputValue(this._valueBeforeAutoSelection ?? '');
                this._pendingAutoselectedOption = null;
            }
            this._closeKeyEventStream.next();
            this._resetActiveItem();
            // We need to stop propagation, otherwise the event will eventually
            // reach the input itself and cause the overlay to be reopened.
            event.stopPropagation();
            event.preventDefault();
        }
    };
    /** Updates the panel's visibility state and any trigger state tied to id. */
    _updatePanelState() {
        this.autocomplete._setVisibility();
        // Note that here we subscribe and unsubscribe based on the panel's visiblity state,
        // because the act of subscribing will prevent events from reaching other overlays and
        // we don't want to block the events if there are no options.
        if (this.panelOpen) {
            const overlayRef = this._overlayRef;
            if (!this._keydownSubscription) {
                // Use the `keydownEvents` in order to take advantage of
                // the overlay event targeting provided by the CDK overlay.
                this._keydownSubscription = overlayRef.keydownEvents().subscribe(this._handlePanelKeydown);
            }
            if (!this._outsideClickSubscription) {
                // Subscribe to the pointer events stream so that it doesn't get picked up by other overlays.
                // TODO(crisbeto): we should switch `_getOutsideClickStream` eventually to use this stream,
                // but the behvior isn't exactly the same and it ends up breaking some internal tests.
                this._outsideClickSubscription = overlayRef.outsidePointerEvents().subscribe();
            }
        }
        else {
            this._keydownSubscription?.unsubscribe();
            this._outsideClickSubscription?.unsubscribe();
            this._keydownSubscription = this._outsideClickSubscription = null;
        }
    }
    _getOverlayConfig() {
        return new OverlayConfig({
            positionStrategy: this._getOverlayPosition(),
            scrollStrategy: this._scrollStrategy(),
            width: this._getPanelWidth(),
            direction: this._dir ?? undefined,
            hasBackdrop: this._defaults?.hasBackdrop,
            backdropClass: this._defaults?.backdropClass,
            panelClass: this._defaults?.overlayPanelClass,
        });
    }
    _getOverlayPosition() {
        // Set default Overlay Position
        const strategy = this._overlay
            .position()
            .flexibleConnectedTo(this._getConnectedElement())
            .withFlexibleDimensions(false)
            .withPush(false);
        this._setStrategyPositions(strategy);
        this._positionStrategy = strategy;
        return strategy;
    }
    /** Sets the positions on a position strategy based on the directive's input state. */
    _setStrategyPositions(positionStrategy) {
        // Note that we provide horizontal fallback positions, even though by default the dropdown
        // width matches the input, because consumers can override the width. See #18854.
        const belowPositions = [
            { originX: 'start', originY: 'bottom', overlayX: 'start', overlayY: 'top' },
            { originX: 'end', originY: 'bottom', overlayX: 'end', overlayY: 'top' },
        ];
        // The overlay edge connected to the trigger should have squared corners, while
        // the opposite end has rounded corners. We apply a CSS class to swap the
        // border-radius based on the overlay position.
        const panelClass = this._aboveClass;
        const abovePositions = [
            { originX: 'start', originY: 'top', overlayX: 'start', overlayY: 'bottom', panelClass },
            { originX: 'end', originY: 'top', overlayX: 'end', overlayY: 'bottom', panelClass },
        ];
        let positions;
        if (this.position === 'above') {
            positions = abovePositions;
        }
        else if (this.position === 'below') {
            positions = belowPositions;
        }
        else {
            positions = [...belowPositions, ...abovePositions];
        }
        positionStrategy.withPositions(positions);
    }
    _getConnectedElement() {
        if (this.connectedTo) {
            return this.connectedTo.elementRef;
        }
        return this._formField ? this._formField.getConnectedOverlayOrigin() : this._element;
    }
    _getPanelWidth() {
        return this.autocomplete.panelWidth || this._getHostWidth();
    }
    /** Returns the width of the input element, so the panel width can match it. */
    _getHostWidth() {
        return this._getConnectedElement().nativeElement.getBoundingClientRect().width;
    }
    /**
     * Reset the active item to -1. This is so that pressing arrow keys will activate the correct
     * option.
     *
     * If the consumer opted-in to automatically activatating the first option, activate the first
     * *enabled* option.
     */
    _resetActiveItem() {
        const autocomplete = this.autocomplete;
        if (autocomplete.autoActiveFirstOption) {
            // Find the index of the first *enabled* option. Avoid calling `_keyManager.setActiveItem`
            // because it activates the first option that passes the skip predicate, rather than the
            // first *enabled* option.
            let firstEnabledOptionIndex = -1;
            for (let index = 0; index < autocomplete.options.length; index++) {
                const option = autocomplete.options.get(index);
                if (!option.disabled) {
                    firstEnabledOptionIndex = index;
                    break;
                }
            }
            autocomplete._keyManager.setActiveItem(firstEnabledOptionIndex);
        }
        else {
            autocomplete._keyManager.setActiveItem(-1);
        }
    }
    /** Determines whether the panel can be opened. */
    _canOpen() {
        const element = this._element.nativeElement;
        return !element.readOnly && !element.disabled && !this.autocompleteDisabled;
    }
    /** Scrolls to a particular option in the list. */
    _scrollToOption(index) {
        // Given that we are not actually focusing active options, we must manually adjust scroll
        // to reveal options below the fold. First, we find the offset of the option from the top
        // of the panel. If that offset is below the fold, the new scrollTop will be the offset -
        // the panel height + the option height, so the active option will be just visible at the
        // bottom of the panel. If that offset is above the top of the visible panel, the new scrollTop
        // will become the offset. If that offset is visible within the panel already, the scrollTop is
        // not adjusted.
        const autocomplete = this.autocomplete;
        const labelCount = _countGroupLabelsBeforeOption(index, autocomplete.options, autocomplete.optionGroups);
        if (index === 0 && labelCount === 1) {
            // If we've got one group label before the option and we're at the top option,
            // scroll the list to the top. This is better UX than scrolling the list to the
            // top of the option, because it allows the user to read the top group's label.
            autocomplete._setScrollTop(0);
        }
        else if (autocomplete.panel) {
            const option = autocomplete.options.toArray()[index];
            if (option) {
                const element = option._getHostElement();
                const newScrollPosition = _getOptionScrollPosition(element.offsetTop, element.offsetHeight, autocomplete._getScrollTop(), autocomplete.panel.nativeElement.offsetHeight);
                autocomplete._setScrollTop(newScrollPosition);
            }
        }
    }
    /**
     * Track which modal we have modified the `aria-owns` attribute of. When the combobox trigger is
     * inside an aria-modal, we apply aria-owns to the parent modal with the `id` of the options
     * panel. Track the modal we have changed so we can undo the changes on destroy.
     */
    _trackedModal = null;
    /**
     * If the autocomplete trigger is inside of an `aria-modal` element, connect
     * that modal to the options panel with `aria-owns`.
     *
     * For some browser + screen reader combinations, when navigation is inside
     * of an `aria-modal` element, the screen reader treats everything outside
     * of that modal as hidden or invisible.
     *
     * This causes a problem when the combobox trigger is _inside_ of a modal, because the
     * options panel is rendered _outside_ of that modal, preventing screen reader navigation
     * from reaching the panel.
     *
     * We can work around this issue by applying `aria-owns` to the modal with the `id` of
     * the options panel. This effectively communicates to assistive technology that the
     * options panel is part of the same interaction as the modal.
     *
     * At time of this writing, this issue is present in VoiceOver.
     * See https://github.com/angular/components/issues/20694
     */
    _applyModalPanelOwnership() {
        // TODO(http://github.com/angular/components/issues/26853): consider de-duplicating this with
        // the `LiveAnnouncer` and any other usages.
        //
        // Note that the selector here is limited to CDK overlays at the moment in order to reduce the
        // section of the DOM we need to look through. This should cover all the cases we support, but
        // the selector can be expanded if it turns out to be too narrow.
        const modal = this._element.nativeElement.closest('body > .cdk-overlay-container [aria-modal="true"]');
        if (!modal) {
            // Most commonly, the autocomplete trigger is not inside a modal.
            return;
        }
        const panelId = this.autocomplete.id;
        if (this._trackedModal) {
            removeAriaReferencedId(this._trackedModal, 'aria-owns', panelId);
        }
        addAriaReferencedId(modal, 'aria-owns', panelId);
        this._trackedModal = modal;
    }
    /** Clears the references to the listbox overlay element from the modal it was added to. */
    _clearFromModal() {
        if (this._trackedModal) {
            const panelId = this.autocomplete.id;
            removeAriaReferencedId(this._trackedModal, 'aria-owns', panelId);
            this._trackedModal = null;
        }
    }
    static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocompleteTrigger, deps: [], target: i0.ɵɵFactoryTarget.Directive });
    static ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "16.1.0", version: "19.2.6", type: MatAutocompleteTrigger, isStandalone: true, selector: "input[matAutocomplete], textarea[matAutocomplete]", inputs: { autocomplete: ["matAutocomplete", "autocomplete"], position: ["matAutocompletePosition", "position"], connectedTo: ["matAutocompleteConnectedTo", "connectedTo"], autocompleteAttribute: ["autocomplete", "autocompleteAttribute"], autocompleteDisabled: ["matAutocompleteDisabled", "autocompleteDisabled", booleanAttribute] }, host: { listeners: { "focusin": "_handleFocus()", "blur": "_onTouched()", "input": "_handleInput($event)", "keydown": "_handleKeydown($event)", "click": "_handleClick()" }, properties: { "attr.autocomplete": "autocompleteAttribute", "attr.role": "autocompleteDisabled ? null : \"combobox\"", "attr.aria-autocomplete": "autocompleteDisabled ? null : \"list\"", "attr.aria-activedescendant": "(panelOpen && activeOption) ? activeOption.id : null", "attr.aria-expanded": "autocompleteDisabled ? null : panelOpen.toString()", "attr.aria-controls": "(autocompleteDisabled || !panelOpen) ? null : autocomplete?.id", "attr.aria-haspopup": "autocompleteDisabled ? null : \"listbox\"" }, classAttribute: "mat-mdc-autocomplete-trigger" }, providers: [MAT_AUTOCOMPLETE_VALUE_ACCESSOR], exportAs: ["matAutocompleteTrigger"], usesOnChanges: true, ngImport: i0 });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocompleteTrigger, decorators: [{
            type: Directive,
            args: [{
                    selector: `input[matAutocomplete], textarea[matAutocomplete]`,
                    host: {
                        'class': 'mat-mdc-autocomplete-trigger',
                        '[attr.autocomplete]': 'autocompleteAttribute',
                        '[attr.role]': 'autocompleteDisabled ? null : "combobox"',
                        '[attr.aria-autocomplete]': 'autocompleteDisabled ? null : "list"',
                        '[attr.aria-activedescendant]': '(panelOpen && activeOption) ? activeOption.id : null',
                        '[attr.aria-expanded]': 'autocompleteDisabled ? null : panelOpen.toString()',
                        '[attr.aria-controls]': '(autocompleteDisabled || !panelOpen) ? null : autocomplete?.id',
                        '[attr.aria-haspopup]': 'autocompleteDisabled ? null : "listbox"',
                        // Note: we use `focusin`, as opposed to `focus`, in order to open the panel
                        // a little earlier. This avoids issues where IE delays the focusing of the input.
                        '(focusin)': '_handleFocus()',
                        '(blur)': '_onTouched()',
                        '(input)': '_handleInput($event)',
                        '(keydown)': '_handleKeydown($event)',
                        '(click)': '_handleClick()',
                    },
                    exportAs: 'matAutocompleteTrigger',
                    providers: [MAT_AUTOCOMPLETE_VALUE_ACCESSOR],
                }]
        }], ctorParameters: () => [], propDecorators: { autocomplete: [{
                type: Input,
                args: ['matAutocomplete']
            }], position: [{
                type: Input,
                args: ['matAutocompletePosition']
            }], connectedTo: [{
                type: Input,
                args: ['matAutocompleteConnectedTo']
            }], autocompleteAttribute: [{
                type: Input,
                args: ['autocomplete']
            }], autocompleteDisabled: [{
                type: Input,
                args: [{ alias: 'matAutocompleteDisabled', transform: booleanAttribute }]
            }] } });

class MatAutocompleteModule {
    static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocompleteModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
    static ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "14.0.0", version: "19.2.6", ngImport: i0, type: MatAutocompleteModule, imports: [OverlayModule,
            MatOptionModule,
            MatCommonModule,
            MatAutocomplete,
            MatAutocompleteTrigger,
            MatAutocompleteOrigin], exports: [CdkScrollableModule,
            MatAutocomplete,
            MatOptionModule,
            MatCommonModule,
            MatAutocompleteTrigger,
            MatAutocompleteOrigin] });
    static ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocompleteModule, providers: [MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER], imports: [OverlayModule,
            MatOptionModule,
            MatCommonModule, CdkScrollableModule,
            MatOptionModule,
            MatCommonModule] });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "19.2.6", ngImport: i0, type: MatAutocompleteModule, decorators: [{
            type: NgModule,
            args: [{
                    imports: [
                        OverlayModule,
                        MatOptionModule,
                        MatCommonModule,
                        MatAutocomplete,
                        MatAutocompleteTrigger,
                        MatAutocompleteOrigin,
                    ],
                    exports: [
                        CdkScrollableModule,
                        MatAutocomplete,
                        MatOptionModule,
                        MatCommonModule,
                        MatAutocompleteTrigger,
                        MatAutocompleteOrigin,
                    ],
                    providers: [MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER],
                }]
        }] });

export { MAT_AUTOCOMPLETE_DEFAULT_OPTIONS, MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY, MAT_AUTOCOMPLETE_SCROLL_STRATEGY, MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY, MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER, MAT_AUTOCOMPLETE_VALUE_ACCESSOR, MatAutocomplete, MatAutocompleteModule, MatAutocompleteOrigin, MatAutocompleteSelectedEvent, MatAutocompleteTrigger, MatOption, getMatAutocompleteMissingPanelError };
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