/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { ActiveDescendantKeyManager } from '@angular/cdk/a11y';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChildren, ElementRef, EventEmitter, Inject, InjectionToken, Input, Output, TemplateRef, ViewChild, ViewEncapsulation, Directive, forwardRef, Host, NgZone, Optional, ViewContainerRef, NgModule } from '@angular/core';
import { MAT_OPTION_PARENT_COMPONENT, MatOptgroup, MatOption, mixinDisableRipple, _countGroupLabelsBeforeOption, _getOptionScrollPosition, MatOptionSelectionChange, MatOptionModule, MatCommonModule } from '@angular/material/core';
import { Directionality } from '@angular/cdk/bidi';
import { DOWN_ARROW, ENTER, ESCAPE, TAB, UP_ARROW } from '@angular/cdk/keycodes';
import { Overlay, OverlayConfig, OverlayModule } from '@angular/cdk/overlay';
import { TemplatePortal } from '@angular/cdk/portal';
import { DOCUMENT, CommonModule } from '@angular/common';
import { filter, take, switchMap, delay, tap, map } from 'rxjs/operators';
import { ViewportRuler } from '@angular/cdk/scrolling';
import { NG_VALUE_ACCESSOR } from '@angular/forms';
import { MatFormField } from '@angular/material/form-field';
import { Subscription, defer, fromEvent, merge, of, Subject } from 'rxjs';

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Autocomplete IDs need to be unique across components, so this counter exists outside of
 * the component definition.
 * @type {?}
 */
let _uniqueAutocompleteIdCounter = 0;
/**
 * Event object that is emitted when an autocomplete option is selected.
 */
class MatAutocompleteSelectedEvent {
    /**
     * @param {?} source
     * @param {?} option
     */
    constructor(source, option) {
        this.source = source;
        this.option = option;
    }
}
// Boilerplate for applying mixins to MatAutocomplete.
/**
 * \@docs-private
 */
class MatAutocompleteBase {
}
/** @type {?} */
const _MatAutocompleteMixinBase = mixinDisableRipple(MatAutocompleteBase);
/**
 * Injection token to be used to override the default options for `mat-autocomplete`.
 * @type {?}
 */
const MAT_AUTOCOMPLETE_DEFAULT_OPTIONS = new InjectionToken('mat-autocomplete-default-options', {
    providedIn: 'root',
    factory: MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY,
});
/**
 * \@docs-private
 * @return {?}
 */
function MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY() {
    return { autoActiveFirstOption: false };
}
class MatAutocomplete extends _MatAutocompleteMixinBase {
    /**
     * @param {?} _changeDetectorRef
     * @param {?} _elementRef
     * @param {?} defaults
     */
    constructor(_changeDetectorRef, _elementRef, defaults) {
        super();
        this._changeDetectorRef = _changeDetectorRef;
        this._elementRef = _elementRef;
        /**
         * Whether the autocomplete panel should be visible, depending on option length.
         */
        this.showPanel = false;
        this._isOpen = false;
        /**
         * Function that maps an option's control value to its display value in the trigger.
         */
        this.displayWith = null;
        /**
         * Event that is emitted whenever an option from the list is selected.
         */
        this.optionSelected = new EventEmitter();
        /**
         * Event that is emitted when the autocomplete panel is opened.
         */
        this.opened = new EventEmitter();
        /**
         * Event that is emitted when the autocomplete panel is closed.
         */
        this.closed = new EventEmitter();
        this._classList = {};
        /**
         * Unique ID to be used by autocomplete trigger's "aria-owns" property.
         */
        this.id = `mat-autocomplete-${_uniqueAutocompleteIdCounter++}`;
        this._autoActiveFirstOption = !!defaults.autoActiveFirstOption;
    }
    /**
     * Whether the autocomplete panel is open.
     * @return {?}
     */
    get isOpen() { return this._isOpen && this.showPanel; }
    /**
     * Whether the first option should be highlighted when the autocomplete panel is opened.
     * Can be configured globally through the `MAT_AUTOCOMPLETE_DEFAULT_OPTIONS` token.
     * @return {?}
     */
    get autoActiveFirstOption() { return this._autoActiveFirstOption; }
    /**
     * @param {?} value
     * @return {?}
     */
    set autoActiveFirstOption(value) {
        this._autoActiveFirstOption = coerceBooleanProperty(value);
    }
    /**
     * Takes classes set on the host mat-autocomplete element and applies them to the panel
     * inside the overlay container to allow for easy styling.
     * @param {?} value
     * @return {?}
     */
    set classList(value) {
        if (value && value.length) {
            this._classList = value.split(' ').reduce((/**
             * @param {?} classList
             * @param {?} className
             * @return {?}
             */
            (classList, className) => {
                classList[className.trim()] = true;
                return classList;
            }), (/** @type {?} */ ({})));
        }
        else {
            this._classList = {};
        }
        this._setVisibilityClasses(this._classList);
        this._elementRef.nativeElement.className = '';
    }
    /**
     * @return {?}
     */
    ngAfterContentInit() {
        this._keyManager = new ActiveDescendantKeyManager(this.options).withWrap();
        // Set the initial visibility state.
        this._setVisibility();
    }
    /**
     * 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.
     * @param {?} scrollTop
     * @return {?}
     */
    _setScrollTop(scrollTop) {
        if (this.panel) {
            this.panel.nativeElement.scrollTop = scrollTop;
        }
    }
    /**
     * Returns the panel's scrollTop.
     * @return {?}
     */
    _getScrollTop() {
        return this.panel ? this.panel.nativeElement.scrollTop : 0;
    }
    /**
     * Panel should hide itself when the option list is empty.
     * @return {?}
     */
    _setVisibility() {
        this.showPanel = !!this.options.length;
        this._setVisibilityClasses(this._classList);
        this._changeDetectorRef.markForCheck();
    }
    /**
     * Emits the `select` event.
     * @param {?} option
     * @return {?}
     */
    _emitSelectEvent(option) {
        /** @type {?} */
        const event = new MatAutocompleteSelectedEvent(this, option);
        this.optionSelected.emit(event);
    }
    /**
     * Sets the autocomplete visibility classes on a classlist based on the panel is visible.
     * @private
     * @param {?} classList
     * @return {?}
     */
    _setVisibilityClasses(classList) {
        classList['mat-autocomplete-visible'] = this.showPanel;
        classList['mat-autocomplete-hidden'] = !this.showPanel;
    }
}
MatAutocomplete.decorators = [
    { type: Component, args: [{selector: 'mat-autocomplete',
                template: "<ng-template><div class=\"mat-autocomplete-panel\" role=\"listbox\" [id]=\"id\" [ngClass]=\"_classList\" #panel><ng-content></ng-content></div></ng-template>",
                styles: [".mat-autocomplete-panel{min-width:112px;max-width:280px;overflow:auto;-webkit-overflow-scrolling:touch;visibility:hidden;max-width:none;max-height:256px;position:relative;width:100%;border-bottom-left-radius:4px;border-bottom-right-radius:4px}.mat-autocomplete-panel.mat-autocomplete-visible{visibility:visible}.mat-autocomplete-panel.mat-autocomplete-hidden{visibility:hidden}.mat-autocomplete-panel-above .mat-autocomplete-panel{border-radius:0;border-top-left-radius:4px;border-top-right-radius:4px}.mat-autocomplete-panel .mat-divider-horizontal{margin-top:-1px}@media (-ms-high-contrast:active){.mat-autocomplete-panel{outline:solid 1px}}"],
                encapsulation: ViewEncapsulation.None,
                changeDetection: ChangeDetectionStrategy.OnPush,
                exportAs: 'matAutocomplete',
                inputs: ['disableRipple'],
                host: {
                    'class': 'mat-autocomplete'
                },
                providers: [
                    { provide: MAT_OPTION_PARENT_COMPONENT, useExisting: MatAutocomplete }
                ]
            },] },
];
/** @nocollapse */
MatAutocomplete.ctorParameters = () => [
    { type: ChangeDetectorRef },
    { type: ElementRef },
    { type: undefined, decorators: [{ type: Inject, args: [MAT_AUTOCOMPLETE_DEFAULT_OPTIONS,] }] }
];
MatAutocomplete.propDecorators = {
    template: [{ type: ViewChild, args: [TemplateRef, { static: true },] }],
    panel: [{ type: ViewChild, args: ['panel', { static: false },] }],
    options: [{ type: ContentChildren, args: [MatOption, { descendants: true },] }],
    optionGroups: [{ type: ContentChildren, args: [MatOptgroup,] }],
    displayWith: [{ type: Input }],
    autoActiveFirstOption: [{ type: Input }],
    panelWidth: [{ type: Input }],
    optionSelected: [{ type: Output }],
    opened: [{ type: Output }],
    closed: [{ type: Output }],
    classList: [{ type: Input, args: ['class',] }]
};

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Directive applied to an element to make it usable
 * as a connection point for an autocomplete panel.
 */
class MatAutocompleteOrigin {
    /**
     * @param {?} elementRef
     */
    constructor(elementRef) {
        this.elementRef = elementRef;
    }
}
MatAutocompleteOrigin.decorators = [
    { type: Directive, args: [{
                selector: '[matAutocompleteOrigin]',
                exportAs: 'matAutocompleteOrigin',
            },] },
];
/** @nocollapse */
MatAutocompleteOrigin.ctorParameters = () => [
    { type: ElementRef }
];

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * The height of each autocomplete option.
 * @type {?}
 */
const AUTOCOMPLETE_OPTION_HEIGHT = 48;
/**
 * The total height of the autocomplete panel.
 * @type {?}
 */
const AUTOCOMPLETE_PANEL_HEIGHT = 256;
/**
 * Injection token that determines the scroll handling while the autocomplete panel is open.
 * @type {?}
 */
const MAT_AUTOCOMPLETE_SCROLL_STRATEGY = new InjectionToken('mat-autocomplete-scroll-strategy');
/**
 * \@docs-private
 * @param {?} overlay
 * @return {?}
 */
function MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY(overlay) {
    return (/**
     * @return {?}
     */
    () => overlay.scrollStrategies.reposition());
}
/**
 * \@docs-private
 * @type {?}
 */
const MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER = {
    provide: MAT_AUTOCOMPLETE_SCROLL_STRATEGY,
    deps: [Overlay],
    useFactory: MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY,
};
/**
 * Provider that allows the autocomplete to register as a ControlValueAccessor.
 * \@docs-private
 * @type {?}
 */
const MAT_AUTOCOMPLETE_VALUE_ACCESSOR = {
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef((/**
     * @return {?}
     */
    () => MatAutocompleteTrigger)),
    multi: true
};
/**
 * Creates an error to be thrown when attempting to use an autocomplete trigger without a panel.
 * \@docs-private
 * @return {?}
 */
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.');
}
class MatAutocompleteTrigger {
    /**
     * @param {?} _element
     * @param {?} _overlay
     * @param {?} _viewContainerRef
     * @param {?} _zone
     * @param {?} _changeDetectorRef
     * @param {?} scrollStrategy
     * @param {?} _dir
     * @param {?} _formField
     * @param {?} _document
     * @param {?=} _viewportRuler
     */
    constructor(_element, _overlay, _viewContainerRef, _zone, _changeDetectorRef, scrollStrategy, _dir, _formField, _document, _viewportRuler) {
        this._element = _element;
        this._overlay = _overlay;
        this._viewContainerRef = _viewContainerRef;
        this._zone = _zone;
        this._changeDetectorRef = _changeDetectorRef;
        this._dir = _dir;
        this._formField = _formField;
        this._document = _document;
        this._viewportRuler = _viewportRuler;
        this._componentDestroyed = false;
        this._autocompleteDisabled = false;
        /**
         * Whether or not the label state is being overridden.
         */
        this._manuallyFloatingLabel = false;
        /**
         * Subscription to viewport size changes.
         */
        this._viewportSubscription = 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.
         */
        this._canOpenOnNextFocus = true;
        /**
         * Stream of keyboard events that can close the panel.
         */
        this._closeKeyEventStream = new Subject();
        /**
         * Event handler for when the window is blurred. Needs to be an
         * arrow function in order to preserve the context.
         */
        this._windowBlurHandler = (/**
         * @return {?}
         */
        () => {
            // 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._document.activeElement !== this._element.nativeElement || this.panelOpen;
        });
        /**
         * `View -> model callback called when value changes`
         */
        this._onChange = (/**
         * @return {?}
         */
        () => { });
        /**
         * `View -> model callback called when autocomplete has been touched`
         */
        this._onTouched = (/**
         * @return {?}
         */
        () => { });
        /**
         * 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.
         */
        this.position = 'auto';
        /**
         * `autocomplete` attribute to be set on the input element.
         * \@docs-private
         */
        this.autocompleteAttribute = 'off';
        this._overlayAttached = false;
        /**
         * Stream of autocomplete option selections.
         */
        this.optionSelections = (/** @type {?} */ (defer((/**
         * @return {?}
         */
        () => {
            if (this.autocomplete && this.autocomplete.options) {
                return merge(...this.autocomplete.options.map((/**
                 * @param {?} option
                 * @return {?}
                 */
                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._zone.onStable
                .asObservable()
                .pipe(take(1), switchMap((/**
             * @return {?}
             */
            () => this.optionSelections)));
        }))));
        if (typeof window !== 'undefined') {
            _zone.runOutsideAngular((/**
             * @return {?}
             */
            () => {
                window.addEventListener('blur', this._windowBlurHandler);
            }));
        }
        this._scrollStrategy = scrollStrategy;
    }
    /**
     * 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.
     * @return {?}
     */
    get autocompleteDisabled() { return this._autocompleteDisabled; }
    /**
     * @param {?} value
     * @return {?}
     */
    set autocompleteDisabled(value) {
        this._autocompleteDisabled = coerceBooleanProperty(value);
    }
    /**
     * @param {?} changes
     * @return {?}
     */
    ngOnChanges(changes) {
        if (changes['position'] && this._positionStrategy) {
            this._setStrategyPositions(this._positionStrategy);
            if (this.panelOpen) {
                (/** @type {?} */ (this._overlayRef)).updatePosition();
            }
        }
    }
    /**
     * @return {?}
     */
    ngOnDestroy() {
        if (typeof window !== 'undefined') {
            window.removeEventListener('blur', this._windowBlurHandler);
        }
        this._viewportSubscription.unsubscribe();
        this._componentDestroyed = true;
        this._destroyPanel();
        this._closeKeyEventStream.complete();
    }
    /**
     * Whether or not the autocomplete panel is open.
     * @return {?}
     */
    get panelOpen() {
        return this._overlayAttached && this.autocomplete.showPanel;
    }
    /**
     * Opens the autocomplete suggestion panel.
     * @return {?}
     */
    openPanel() {
        this._attachOverlay();
        this._floatLabel();
    }
    /**
     * Closes the autocomplete suggestion panel.
     * @return {?}
     */
    closePanel() {
        this._resetLabel();
        if (!this._overlayAttached) {
            return;
        }
        if (this.panelOpen) {
            // Only emit if the panel was visible.
            this.autocomplete.closed.emit();
        }
        this.autocomplete._isOpen = this._overlayAttached = false;
        if (this._overlayRef && this._overlayRef.hasAttached()) {
            this._overlayRef.detach();
            this._closingActionsSubscription.unsubscribe();
        }
        // 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();
        }
    }
    /**
     * Updates the position of the autocomplete suggestion panel to ensure that it fits all options
     * within the viewport.
     * @return {?}
     */
    updatePosition() {
        if (this._overlayAttached) {
            (/** @type {?} */ (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.
     * @return {?}
     */
    get panelClosingActions() {
        return merge(this.optionSelections, this.autocomplete._keyManager.tabOut.pipe(filter((/**
         * @return {?}
         */
        () => this._overlayAttached))), this._closeKeyEventStream, this._getOutsideClickStream(), this._overlayRef ?
            this._overlayRef.detachments().pipe(filter((/**
             * @return {?}
             */
            () => this._overlayAttached))) :
            of()).pipe(
        // Normalize the output so we return a consistent type.
        map((/**
         * @param {?} event
         * @return {?}
         */
        event => event instanceof MatOptionSelectionChange ? event : null)));
    }
    /**
     * The currently active option, coerced to MatOption type.
     * @return {?}
     */
    get activeOption() {
        if (this.autocomplete && this.autocomplete._keyManager) {
            return this.autocomplete._keyManager.activeItem;
        }
        return null;
    }
    /**
     * Stream of clicks outside of the autocomplete panel.
     * @private
     * @return {?}
     */
    _getOutsideClickStream() {
        return merge((/** @type {?} */ (fromEvent(this._document, 'click'))), (/** @type {?} */ (fromEvent(this._document, 'touchend'))))
            .pipe(filter((/**
         * @param {?} event
         * @return {?}
         */
        event => {
            /** @type {?} */
            const clickTarget = (/** @type {?} */ (event.target));
            /** @type {?} */
            const formField = this._formField ?
                this._formField._elementRef.nativeElement : null;
            return this._overlayAttached &&
                clickTarget !== this._element.nativeElement &&
                (!formField || !formField.contains(clickTarget)) &&
                (!!this._overlayRef && !this._overlayRef.overlayElement.contains(clickTarget));
        })));
    }
    // Implemented as part of ControlValueAccessor.
    /**
     * @param {?} value
     * @return {?}
     */
    writeValue(value) {
        Promise.resolve(null).then((/**
         * @return {?}
         */
        () => this._setTriggerValue(value)));
    }
    // Implemented as part of ControlValueAccessor.
    /**
     * @param {?} fn
     * @return {?}
     */
    registerOnChange(fn) {
        this._onChange = fn;
    }
    // Implemented as part of ControlValueAccessor.
    /**
     * @param {?} fn
     * @return {?}
     */
    registerOnTouched(fn) {
        this._onTouched = fn;
    }
    // Implemented as part of ControlValueAccessor.
    /**
     * @param {?} isDisabled
     * @return {?}
     */
    setDisabledState(isDisabled) {
        this._element.nativeElement.disabled = isDisabled;
    }
    /**
     * @param {?} event
     * @return {?}
     */
    _handleKeydown(event) {
        /** @type {?} */
        const keyCode = event.keyCode;
        // 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) {
            event.preventDefault();
        }
        if (this.activeOption && keyCode === ENTER && this.panelOpen) {
            this.activeOption._selectViaInteraction();
            this._resetActiveItem();
            event.preventDefault();
        }
        else if (this.autocomplete) {
            /** @type {?} */
            const prevActiveItem = this.autocomplete._keyManager.activeItem;
            /** @type {?} */
            const isArrowKey = keyCode === UP_ARROW || keyCode === DOWN_ARROW;
            if (this.panelOpen || keyCode === TAB) {
                this.autocomplete._keyManager.onKeydown(event);
            }
            else if (isArrowKey && this._canOpen()) {
                this.openPanel();
            }
            if (isArrowKey || this.autocomplete._keyManager.activeItem !== prevActiveItem) {
                this._scrollToOption();
            }
        }
    }
    /**
     * @param {?} event
     * @return {?}
     */
    _handleInput(event) {
        /** @type {?} */
        let target = (/** @type {?} */ (event.target));
        /** @type {?} */
        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._onChange(value);
            if (this._canOpen() && this._document.activeElement === event.target) {
                this.openPanel();
            }
        }
    }
    /**
     * @return {?}
     */
    _handleFocus() {
        if (!this._canOpenOnNextFocus) {
            this._canOpenOnNextFocus = true;
        }
        else if (this._canOpen()) {
            this._previousValue = this._element.nativeElement.value;
            this._attachOverlay();
            this._floatLabel(true);
        }
    }
    /**
     * 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.
     * @private
     * @param {?=} shouldAnimate Whether the label should be animated when it is floated.
     * @return {?}
     */
    _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.
     * @private
     * @return {?}
     */
    _resetLabel() {
        if (this._manuallyFloatingLabel) {
            this._formField.floatLabel = 'auto';
            this._manuallyFloatingLabel = false;
        }
    }
    /**
     * 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.
     * @private
     * @return {?}
     */
    _scrollToOption() {
        /** @type {?} */
        const index = this.autocomplete._keyManager.activeItemIndex || 0;
        /** @type {?} */
        const labelCount = _countGroupLabelsBeforeOption(index, this.autocomplete.options, this.autocomplete.optionGroups);
        /** @type {?} */
        const newScrollPosition = _getOptionScrollPosition(index + labelCount, AUTOCOMPLETE_OPTION_HEIGHT, this.autocomplete._getScrollTop(), AUTOCOMPLETE_PANEL_HEIGHT);
        this.autocomplete._setScrollTop(newScrollPosition);
    }
    /**
     * This method listens to a stream of panel closing actions and resets the
     * stream every time the option list changes.
     * @private
     * @return {?}
     */
    _subscribeToClosingActions() {
        /** @type {?} */
        const firstStable = this._zone.onStable.asObservable().pipe(take(1));
        /** @type {?} */
        const optionChanges = this.autocomplete.options.changes.pipe(tap((/**
         * @return {?}
         */
        () => 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));
        // When the zone is stable initially, and when the option list changes...
        return merge(firstStable, 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((/**
         * @return {?}
         */
        () => {
            /** @type {?} */
            const wasOpen = this.panelOpen;
            this._resetActiveItem();
            this.autocomplete._setVisibility();
            if (this.panelOpen) {
                (/** @type {?} */ (this._overlayRef)).updatePosition();
                // If the `panelOpen` state changed, we need to make sure to emit the `opened`
                // event, because we may not have emitted it when the panel was attached. 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 (wasOpen !== this.panelOpen) {
                    this.autocomplete.opened.emit();
                }
            }
            return this.panelClosingActions;
        })), 
        // when the first closing event occurs...
        take(1))
            // set the value, close the panel, and complete.
            .subscribe((/**
         * @param {?} event
         * @return {?}
         */
        event => this._setValueAndClose(event)));
    }
    /**
     * Destroys the autocomplete suggestion panel.
     * @private
     * @return {?}
     */
    _destroyPanel() {
        if (this._overlayRef) {
            this.closePanel();
            this._overlayRef.dispose();
            this._overlayRef = null;
        }
    }
    /**
     * @private
     * @param {?} value
     * @return {?}
     */
    _setTriggerValue(value) {
        /** @type {?} */
        const toDisplay = this.autocomplete && this.autocomplete.displayWith ?
            this.autocomplete.displayWith(value) :
            value;
        // 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.
        /** @type {?} */
        const inputValue = toDisplay != null ? toDisplay : '';
        // 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 = inputValue;
        }
        else {
            this._element.nativeElement.value = inputValue;
        }
        this._previousValue = inputValue;
    }
    /**
     * 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.
     * @private
     * @param {?} event
     * @return {?}
     */
    _setValueAndClose(event) {
        if (event && event.source) {
            this._clearPreviousSelectedOption(event.source);
            this._setTriggerValue(event.source.value);
            this._onChange(event.source.value);
            this._element.nativeElement.focus();
            this.autocomplete._emitSelectEvent(event.source);
        }
        this.closePanel();
    }
    /**
     * Clear any previous selected option and emit a selection change event for this option
     * @private
     * @param {?} skip
     * @return {?}
     */
    _clearPreviousSelectedOption(skip) {
        this.autocomplete.options.forEach((/**
         * @param {?} option
         * @return {?}
         */
        option => {
            if (option != skip && option.selected) {
                option.deselect();
            }
        }));
    }
    /**
     * @private
     * @return {?}
     */
    _attachOverlay() {
        if (!this.autocomplete) {
            throw getMatAutocompleteMissingPanelError();
        }
        /** @type {?} */
        let overlayRef = this._overlayRef;
        if (!overlayRef) {
            this._portal = new TemplatePortal(this.autocomplete.template, this._viewContainerRef);
            overlayRef = this._overlay.create(this._getOverlayConfig());
            this._overlayRef = overlayRef;
            // Use the `keydownEvents` in order to take advantage of
            // the overlay event targeting provided by the CDK overlay.
            overlayRef.keydownEvents().subscribe((/**
             * @param {?} event
             * @return {?}
             */
            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 || (event.keyCode === UP_ARROW && event.altKey)) {
                    this._resetActiveItem();
                    this._closeKeyEventStream.next();
                    // 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();
                }
            }));
            if (this._viewportRuler) {
                this._viewportSubscription = this._viewportRuler.change().subscribe((/**
                 * @return {?}
                 */
                () => {
                    if (this.panelOpen && overlayRef) {
                        overlayRef.updateSize({ width: this._getPanelWidth() });
                    }
                }));
            }
        }
        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._closingActionsSubscription = this._subscribeToClosingActions();
        }
        /** @type {?} */
        const wasOpen = this.panelOpen;
        this.autocomplete._setVisibility();
        this.autocomplete._isOpen = this._overlayAttached = true;
        // 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.autocomplete.opened.emit();
        }
    }
    /**
     * @private
     * @return {?}
     */
    _getOverlayConfig() {
        return new OverlayConfig({
            positionStrategy: this._getOverlayPosition(),
            scrollStrategy: this._scrollStrategy(),
            width: this._getPanelWidth(),
            direction: this._dir
        });
    }
    /**
     * @private
     * @return {?}
     */
    _getOverlayPosition() {
        /** @type {?} */
        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.
     * @private
     * @param {?} positionStrategy
     * @return {?}
     */
    _setStrategyPositions(positionStrategy) {
        /** @type {?} */
        const belowPosition = {
            originX: 'start',
            originY: 'bottom',
            overlayX: 'start',
            overlayY: 'top'
        };
        /** @type {?} */
        const abovePosition = {
            originX: 'start',
            originY: 'top',
            overlayX: 'start',
            overlayY: 'bottom',
            // 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.
            panelClass: 'mat-autocomplete-panel-above'
        };
        /** @type {?} */
        let positions;
        if (this.position === 'above') {
            positions = [abovePosition];
        }
        else if (this.position === 'below') {
            positions = [belowPosition];
        }
        else {
            positions = [belowPosition, abovePosition];
        }
        positionStrategy.withPositions(positions);
    }
    /**
     * @private
     * @return {?}
     */
    _getConnectedElement() {
        if (this.connectedTo) {
            return this.connectedTo.elementRef;
        }
        return this._formField ? this._formField.getConnectedOverlayOrigin() : this._element;
    }
    /**
     * @private
     * @return {?}
     */
    _getPanelWidth() {
        return this.autocomplete.panelWidth || this._getHostWidth();
    }
    /**
     * Returns the width of the input element, so the panel width can match it.
     * @private
     * @return {?}
     */
    _getHostWidth() {
        return this._getConnectedElement().nativeElement.getBoundingClientRect().width;
    }
    /**
     * Resets the active item to -1 so arrow events will activate the
     * correct options, or to 0 if the consumer opted into it.
     * @private
     * @return {?}
     */
    _resetActiveItem() {
        this.autocomplete._keyManager.setActiveItem(this.autocomplete.autoActiveFirstOption ? 0 : -1);
    }
    /**
     * Determines whether the panel can be opened.
     * @private
     * @return {?}
     */
    _canOpen() {
        /** @type {?} */
        const element = this._element.nativeElement;
        return !element.readOnly && !element.disabled && !this._autocompleteDisabled;
    }
}
MatAutocompleteTrigger.decorators = [
    { type: Directive, args: [{
                selector: `input[matAutocomplete], textarea[matAutocomplete]`,
                host: {
                    '[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-owns]': '(autocompleteDisabled || !panelOpen) ? null : autocomplete?.id',
                    '[attr.aria-haspopup]': '!autocompleteDisabled',
                    // 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)',
                },
                exportAs: 'matAutocompleteTrigger',
                providers: [MAT_AUTOCOMPLETE_VALUE_ACCESSOR]
            },] },
];
/** @nocollapse */
MatAutocompleteTrigger.ctorParameters = () => [
    { type: ElementRef },
    { type: Overlay },
    { type: ViewContainerRef },
    { type: NgZone },
    { type: ChangeDetectorRef },
    { type: undefined, decorators: [{ type: Inject, args: [MAT_AUTOCOMPLETE_SCROLL_STRATEGY,] }] },
    { type: Directionality, decorators: [{ type: Optional }] },
    { type: MatFormField, decorators: [{ type: Optional }, { type: Host }] },
    { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] },
    { type: ViewportRuler }
];
MatAutocompleteTrigger.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: ['matAutocompleteDisabled',] }]
};

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
class MatAutocompleteModule {
}
MatAutocompleteModule.decorators = [
    { type: NgModule, args: [{
                imports: [MatOptionModule, OverlayModule, MatCommonModule, CommonModule],
                exports: [
                    MatAutocomplete,
                    MatOptionModule,
                    MatAutocompleteTrigger,
                    MatAutocompleteOrigin,
                    MatCommonModule
                ],
                declarations: [MatAutocomplete, MatAutocompleteTrigger, MatAutocompleteOrigin],
                providers: [MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER],
            },] },
];

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */

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