import { BooleanInput } from '@angular/cdk/coercion';
import { ListboxChild, ListboxComponent, OptionComponent } from '../../../listbox/public_api';
import { ControlValueAccessor } from '@angular/forms';
import { AfterContentInit, ElementRef, EventEmitter, OnDestroy, QueryList } from '@angular/core';
import { FocusOrigin, ListKeyManager, ListKeyManagerOption } from '@angular/cdk/a11y';
import { PopoverTriggerDirective } from '../../../popover/src/popover-trigger.directive';
import { SelectValueHolder } from './select-value-holder';
import { SelectionTextDirective } from '../select/selection-text.directive';
import * as i0 from "@angular/core";
export declare abstract class SelectComponentBase implements ControlValueAccessor, AfterContentInit, OnDestroy {
    protected valueHolder: SelectValueHolder;
    /**
     * Whether the component is disabled.
     */
    disabled: BooleanInput;
    /** A unique id for the select. If none is supplied, it will be auto-generated. */
    id: string;
    /** The name of the input, used when submitting an HTML form. */
    name?: string;
    /** The autocomplete behavior */
    autocomplete?: string;
    /**
     * Placeholder to be shown if no value has been selected.
     */
    placeholder?: string;
    /**
     * Emitted when the popover is opened
     */
    readonly opened: EventEmitter<void>;
    /**
     * Emitted when the popover is closed
     */
    readonly closed: EventEmitter<void>;
    options: QueryList<OptionComponent>;
    listboxChildren: QueryList<ListboxChild>;
    /**
     * Manages keyboard events for options in the panel.
     */
    protected keyManager: ListKeyManager<{
        value: string;
    } & ListKeyManagerOption> | undefined;
    /**
     * Emits whenever the dropdown is closed as a result of an option (already
     * selected or not) being selected.
     */
    selected: EventEmitter<any>;
    ariaLabel: string | null;
    ariaLabelledby?: string | null;
    selectionText?: SelectionTextDirective;
    /**
     * Used to provide custom empty state content.
     * When not provided, the default "No results" (in given language) message is shown.
     * Passing `null` will hide the popover with the empty state message.
     */
    emptyState?: ListboxComponent['emptyState'];
    /**
     * Used to work around ExpressionChangedAfterItHasBeenCheckedError error thrown from HiddenSelect,
     * when the select component is rendered from a template (e.g. with *ngIf). It's set to true
     * asynchronously after content is initialized, to delay rendering of things that depend on
     * options. It's not clear why the issue happens, and it only happens when select is used with
     * *ngIf, or generally in a template.
     */
    _initialized: boolean;
    set listboxValue(value: readonly string[]);
    get listboxValue(): readonly string[];
    get selectedOptions(): OptionComponent[];
    private changeDetectorRef;
    constructor(valueHolder: SelectValueHolder);
    protected abstract triggerRef: PopoverTriggerDirective | undefined;
    protected abstract triggerElementRef: ElementRef<HTMLElement> | undefined;
    protected abstract listbox: ListboxComponent | undefined;
    abstract focus(focusOrigin: FocusOrigin): void;
    abstract isFocused(): boolean;
    handleKeyDown($event: KeyboardEvent): void;
    getSelectionText(): string;
    /**
     * Whether multiple selection is allowed.
     */
    get multiple(): boolean;
    ngAfterContentInit(): void;
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    /**
     * Called when an item in the listbox is selected.
     */
    _handleSelected(): void;
    isOpen(): boolean;
    open(): void;
    close(): void;
    toggle(): void;
    protected getFieldLabel?(): string;
    getLabelText(): string | undefined;
    protected controlValueAccessorChangeFn: (value: any) => void;
    onTouched: () => any;
    _onOpen(): void;
    _onClose(): void;
    /**
     * Implemented as part of ControlValueAccessor.
     */
    registerOnChange(fn: any): void;
    /**
     * Implemented as part of ControlValueAccessor.
     */
    registerOnTouched(fn: any): void;
    /**
     * Implemented as part of ControlValueAccessor.
     */
    setDisabledState(isDisabled: boolean): void;
    /**
     * Implemented as part of ControlValueAccessor.
     */
    writeValue(value: unknown): void;
    protected getNextEnabledOptionValue(direction?: 'left' | 'right'): string | undefined;
    protected initKeyManager(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<SelectComponentBase, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<SelectComponentBase, never, never, { "disabled": "disabled"; "id": "id"; "name": "name"; "autocomplete": "autocomplete"; "placeholder": "placeholder"; "ariaLabel": "aria-label"; "ariaLabelledby": "aria-labelledby"; "emptyState": "emptyState"; }, { "opened": "opened"; "closed": "closed"; "selected": "selected"; }, ["selectionText", "options", "listboxChildren"], never, false, never>;
}