/**
 * @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 { AfterContentInit, ElementRef, QueryList, TemplateRef, ChangeDetectorRef, EventEmitter, InjectionToken } from '@angular/core';
import { MatOption, MatOptgroup, CanDisableRipple } from '@angular/material/core';
import { ActiveDescendantKeyManager } from '@angular/cdk/a11y';
/** Event object that is emitted when an autocomplete option is selected. */
export declare class MatAutocompleteSelectedEvent {
    /** Reference to the autocomplete panel that emitted the event. */
    source: MatAutocomplete;
    /** Option that was selected. */
    option: MatOption;
    constructor(
        /** Reference to the autocomplete panel that emitted the event. */
        source: MatAutocomplete, 
        /** Option that was selected. */
        option: MatOption);
}
/** @docs-private */
export declare class MatAutocompleteBase {
}
export declare const _MatAutocompleteMixinBase: (new (...args: any[]) => CanDisableRipple) & typeof MatAutocompleteBase;
/** Default `mat-autocomplete` options that can be overridden. */
export interface MatAutocompleteDefaultOptions {
    /** Whether the first option should be highlighted when an autocomplete panel is opened. */
    autoActiveFirstOption?: boolean;
}
/** Injection token to be used to override the default options for `mat-autocomplete`. */
export declare const MAT_AUTOCOMPLETE_DEFAULT_OPTIONS: InjectionToken<MatAutocompleteDefaultOptions>;
/** @docs-private */
export declare function MAT_AUTOCOMPLETE_DEFAULT_OPTIONS_FACTORY(): MatAutocompleteDefaultOptions;
export declare class MatAutocomplete extends _MatAutocompleteMixinBase implements AfterContentInit, CanDisableRipple {
    private _changeDetectorRef;
    private _elementRef;
    /** Manages active item in option list based on key events. */
    _keyManager: ActiveDescendantKeyManager<MatOption>;
    /** Whether the autocomplete panel should be visible, depending on option length. */
    showPanel: boolean;
    /** Whether the autocomplete panel is open. */
    readonly isOpen: boolean;
    _isOpen: boolean;
    /** @docs-private */
    template: TemplateRef<any>;
    /** Element for the panel containing the autocomplete options. */
    panel: ElementRef;
    /** @docs-private */
    options: QueryList<MatOption>;
    /** @docs-private */
    optionGroups: QueryList<MatOptgroup>;
    /** Function that maps an option's control value to its display value in the trigger. */
    displayWith: ((value: any) => string) | 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: boolean;
    private _autoActiveFirstOption;
    /** Event that is emitted whenever an option from the list is selected. */
    readonly optionSelected: EventEmitter<MatAutocompleteSelectedEvent>;
    /** Event that is emitted when the autocomplete panel is opened. */
    readonly opened: EventEmitter<void>;
    /** Event that is emitted when the autocomplete panel is closed. */
    readonly closed: EventEmitter<void>;
    /**
     * Takes classes set on the host mat-autocomplete element and applies them to the panel
     * inside the overlay container to allow for easy styling.
     */
    classList: string;
    _classList: {
        [key: string]: boolean;
    };
    /** Unique ID to be used by autocomplete trigger's "aria-owns" property. */
    id: string;
    constructor(_changeDetectorRef: ChangeDetectorRef, _elementRef: ElementRef, defaults: MatAutocompleteDefaultOptions);
    ngAfterContentInit(): void;
    /**
     * 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: number): void;
    /** Returns the panel's scrollTop. */
    _getScrollTop(): number;
    /** Panel should hide itself when the option list is empty. */
    _setVisibility(): void;
    /** Emits the `select` event. */
    _emitSelectEvent(option: MatOption): void;
}