import { EventEmitter } from '@angular/core';
import { OnChanges, QueryList, SimpleChanges } from '@angular/core';
import { MatLegacyOption as MatOption } from '@angular/material/legacy-core';
import * as i0 from "@angular/core";
export declare class AutocompleteKeyboardNavigationDirective implements OnChanges {
    /**
     * need this to notify that key was clicked when navigation is disabled like close autocomplte panel
     */
    keyboardNavigationDisable: boolean;
    /**
     * need to know if item selected to enable or disable enter to select item
     */
    keyboardNavigationItemSelected: boolean;
    /**
     * all items that needed to loop on
     */
    keyboardNavigationItems: any[];
    /**
     * trigger navigation index change so we can mark the mat-option as active
     */
    keyboardNavigationIndexChange: EventEmitter<number>;
    /**
     * trigger when user select option
     */
    keyboardSelectedOption: EventEmitter<any>;
    /**
     * trigger when keypress and the navigation is disabled
     * ex: the autocomplete panel is closed
     * can be used to open the navigation panel on specific keys
     */
    keyboardPressWhenNavigationDisabled: EventEmitter<KeyboardEvent>;
    /**
     * trigger when got to end of scroll and need to scroll back up
     * in cases where the option is not in dom because of virtual scroll
     */
    keyboardScrollUpNeeded: EventEmitter<void>;
    currentOptions: QueryList<MatOption>;
    private currentNavigationIndex;
    ngOnChanges(changes: SimpleChanges): void;
    /**
     * handle the autocomplete key event
     */
    autoCompleteKeyDown(key: KeyboardEvent): void;
    /**
     * get index if exists in items helper if not return -1
     */
    private getIndexIfExistsOrMinusOne;
    /**
     * emit the index defined in navigation items helper or null if not fount
     */
    private emitCurrentIndex;
    /**
     * get the active keyboard item if the active index is FIRST_OPTION_TEMPLATE_SELECTED_INDEX (-1) return the term typed
     * if nothing selected it will return null
     */
    private getActiveKeyboardOptionValue;
    static ɵfac: i0.ɵɵFactoryDeclaration<AutocompleteKeyboardNavigationDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<AutocompleteKeyboardNavigationDirective, "[singKeyboardNavigation]", never, { "keyboardNavigationDisable": "keyboardNavigationDisable"; "keyboardNavigationItemSelected": "keyboardNavigationItemSelected"; "keyboardNavigationItems": "keyboardNavigationItems"; }, { "keyboardNavigationIndexChange": "keyboardNavigationIndexChange"; "keyboardSelectedOption": "keyboardSelectedOption"; "keyboardPressWhenNavigationDisabled": "keyboardPressWhenNavigationDisabled"; "keyboardScrollUpNeeded": "keyboardScrollUpNeeded"; }, ["currentOptions"], never, false, never>;
}
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