import { ComboboxAutocomplete, SelectPosition, ListboxOption, DelegatesARIACombobox, StartEnd } from '@ni/fast-foundation';
import { ToggleButton } from '../toggle-button';
import { DropdownAppearance, type DropdownPattern } from '../patterns/dropdown/types';
import type { AnchoredRegion } from '../anchored-region';
import { FormAssociatedCombobox } from './models/combobox-form-associated';
declare global {
    interface HTMLElementTagNameMap {
        'nimble-combobox': Combobox;
    }
}
declare const Combobox_base: (abstract new (...args: any[]) => {
    errorText?: string;
    errorVisible: boolean;
    errorHasOverflow: boolean;
    readonly $fastController: import("@ni/fast-element").Controller;
    $emit(type: string, detail?: any, options?: Omit<CustomEventInit, "detail">): boolean | void;
    connectedCallback(): void;
    disconnectedCallback(): void;
    attributeChangedCallback(name: string, oldValue: string, newValue: string): void;
}) & (abstract new (...args: any[]) => {
    requiredVisible: boolean;
    readonly $fastController: import("@ni/fast-element").Controller;
    $emit(type: string, detail?: any, options?: Omit<CustomEventInit, "detail">): boolean | void;
    connectedCallback(): void;
    disconnectedCallback(): void;
    attributeChangedCallback(name: string, oldValue: string, newValue: string): void;
}) & typeof FormAssociatedCombobox;
/**
 * A nimble-styed HTML combobox
 */
export declare class Combobox extends Combobox_base implements DropdownPattern {
    appearance: DropdownAppearance;
    appearanceReadOnly: boolean;
    fullBleed: boolean;
    /**
     * The autocomplete attribute.
     */
    autocomplete?: ComboboxAutocomplete;
    /**
     * The placement for the listbox when the combobox is open.
     */
    positionAttribute?: SelectPosition;
    /**
     * The open attribute.
     */
    open: boolean;
    /**
     * Sets the placeholder value of the element, generally used to provide a hint to the user.
     * @remarks Using a non-null assertion to mimic FAST's original improper typing of an
     * uninitialized property:
     * https://github.com/microsoft/fast/blob/0c27d027ff6e8616ad4fddc17f4432aa7f6cbad0/packages/web-components/fast-foundation/src/combobox/combobox.ts#L199
     */
    placeholder: string;
    /**
     * The current state of the calculated position of the listbox.
     *
     * @public
     */
    position?: SelectPosition;
    /**
     * @internal
     */
    region?: AnchoredRegion;
    /**
     * @internal
     */
    controlWrapper: HTMLElement;
    /**
     * @internal
     */
    control: HTMLInputElement;
    /**
     * @internal
     */
    listbox: HTMLDivElement;
    /**
     * @internal
     */
    readonly dropdownButton?: ToggleButton;
    /**
     * @internal
     *
     * The collection of currently filtered options.
     */
    filteredOptions: ListboxOption[];
    /** @internal */
    hasOverflow: boolean;
    get value(): string;
    set value(next: string);
    /**
     * The list of options.
     *
     * Overrides `Listbox.options`.
     */
    get options(): ListboxOption[];
    set options(value: ListboxOption[]);
    /**
     * The unique id for the internal listbox element.
     *
     * @internal
     */
    listboxId: string;
    /**
     * The space available in the viewport for the listbox when opened.
     *
     * @internal
     */
    availableViewportHeight: number;
    private valueUpdatedByInput;
    private valueBeforeTextUpdate?;
    private _value;
    private filter;
    /**
     * The initial state of the position attribute.
     */
    private forcedPosition;
    private get isAutocompleteInline();
    private get isAutocompleteList();
    private get isAutocompleteBoth();
    slottedOptionsChanged(prev: HTMLElement[], next: HTMLElement[]): void;
    connectedCallback(): void;
    /**
     * @internal
     */
    clickHandler(e: MouseEvent): boolean;
    /**
     * @internal
     */
    toggleButtonClickHandler(e: Event): void;
    /**
     * @internal
     */
    toggleButtonChangeHandler(e: Event): void;
    /**
     * @internal
     */
    toggleButtonKeyDownHandler(e: KeyboardEvent): boolean;
    /**
     * @internal
     */
    filterOptions(): void;
    /**
     * @internal
     */
    inputHandler(e: InputEvent): boolean;
    keydownHandler(e: KeyboardEvent): boolean;
    /**
     * @internal
     */
    keyupHandler(e: KeyboardEvent): boolean;
    /**
     * @internal
     */
    focusoutHandler(e: FocusEvent): boolean;
    /**
     * Reset the element to its first selectable option when its parent form is reset.
     *
     * @internal
     */
    formResetCallback(): void;
    /** {@inheritDoc (FormAssociated:interface).validate} */
    validate(): void;
    /**
     * Set the default selected options at initialization or reset.
     *
     * @internal
     * @remarks
     * Overrides `Listbox.setDefaultSelectedOption`
     */
    setDefaultSelectedOption(): void;
    /**
     * @internal
     */
    selectedIndexChanged(prev: number | undefined, next: number): void;
    /**
     * Synchronize the `aria-disabled` property when the `disabled` property changes.
     *
     * @internal
     */
    disabledChanged(prev: boolean, next: boolean): void;
    /**
     * Move focus to the next selectable option.
     *
     * @internal
     * @remarks Has the same behavior as `Listbox.selectNextOption` except it skips disabled options.
     * Overrides `Listbox.selectNextOption`
     */
    selectNextOption(): void;
    /**
     * Move focus to the previous selectable option.
     *
     * @internal
     * @remarks Has the same behavior as `Listbox.selectPreviousOption` except it skips disabled options and allows moving focus to the input.
     * Overrides `Listbox.selectPreviousOption`
     */
    selectPreviousOption(): void;
    /**
     * @internal
     */
    setPositioning(): void;
    /**
     * Focus the control and scroll the first selected option into view.
     *
     * @internal
     * @remarks
     * Overrides: `Listbox.focusAndScrollOptionIntoView`
     */
    protected focusAndScrollOptionIntoView(): void;
    protected openChanged(): void;
    protected placeholderChanged(): void;
    /**
     * Need to update even when options is empty.
     * @internal
     * @remarks Same as `Listbox.setSelectedOptions` except does not check if options is non-empty.
     * Overrides: `Listbox.setSelectedOptions`
     */
    protected setSelectedOptions(): void;
    /**
     * Ensure that the entire list of options is used when setting the selected property.
     * @internal
     * @remarks
     * Overrides: `Listbox.selectedOptionsChanged`
     */
    protected selectedOptionsChanged(_: ListboxOption[] | undefined, next: ListboxOption[]): void;
    protected positionChanged(_: SelectPosition | undefined, next: SelectPosition | undefined): void;
    private regionChanged;
    private controlWrapperChanged;
    private ariaLabelChanged;
    /**
     * Sets the value and to match the first selected option.
     */
    private updateValue;
    /**
     * Focus and set the content of the control based on the first selected option.
     */
    private setInputToSelection;
    /**
     * Focus, set and select the content of the control based on the first selected option.
     */
    private setInlineSelection;
    private clearSelectionRange;
    /**
     * Determines if a value update should involve emitting a change event, then updates the value.
     */
    private syncValue;
    private updateInputAriaLabel;
    /**
     * This will only emit a `change` event after text entry where the text in the input prior to
     * typing is different than the text present upon an attempt to commit (e.g. pressing <Enter>).
     * So, for a concrete example:
     * 1) User types 'Sue' (when Combobox input was blank).
     * 2) User presses <Enter> -> 'change' event fires
     * 3) User deletes 'Sue'
     * 4) User re-types 'Sue'
     * 5) User presses <Enter> -> NO 'change' event is fired
     */
    private emitChangeIfValueUpdated;
    private findIndexOfValidOption;
}
export interface Combobox extends StartEnd, DelegatesARIACombobox {
}
export declare const comboboxTag = "nimble-combobox";
export {};