/**
 * @license
 * Copyright LOGO YAZILIM SANAYİ VE TİCARET A.Ş.
 *
 * Save to the extent permitted by law, you may not use, copy, modify,
 * distribute or create derivative works of this material or any part
 * of it without the prior written consent of LOGO YAZILIM SANAYİ VE TİCARET A.Ş. Limited.
 * Any reproduction of this material must contain this notice.
 */
// @ts-ignore
import { Constructor } from '@open-wc/dedupe-mixin';
import { DisabledMixinClass } from './disabled-mixin.js';

/**
 * A mixin to toggle the `tabindex` attribute.
 *
 * By default, the attribute is set to 0 that makes the element focusable.
 *
 * The attribute is set to -1 whenever the user disables the element
 * and restored with the last known value once the element is enabled.
 */
export declare function TabindexMixin<T extends Constructor<HTMLElement>>(
  base: T
): T & Constructor<DisabledMixinClass> & Constructor<TabindexMixinClass>;

export declare class TabindexMixinClass {
  /**
   * Indicates whether the element can be focused and where it participates in sequential keyboard navigation.
   */
  tabindex: number | undefined | null;

  /**
   * When the user has changed tabindex while the element is disabled,
   * the observer reverts tabindex to -1 and rather saves the new tabindex value to apply it later.
   * The new value will be applied as soon as the element becomes enabled.
   */
  protected _tabindexChanged(tabindex: number | undefined | null): void;
}