import type { CSSResultGroup, PropertyValues } from 'lit';
import SynDivider from '../divider/divider.component.js';
import SynIcon from '../icon/icon.component.js';
import SynergyElement from '../../internal/synergy-element.js';
/**
 * @summary Flexible button / link component that can be used to quickly build navigations.
 * @documentation https://synergy-design-system.github.io/?path=/docs/components-syn-nav-item--docs
 * Takes one of 3 forms:
 * - button (default),
 * - link (overrides button if a 'href' is provided),
 * - or accordion (overrides all other if 'children' slot is defined).
 *
 * @status stable
 * @since 1.15.0
 *
 * @dependency syn-divider
 * @dependency syn-icon
 *
 * @event syn-show - Emitted when the navigation item:
 * - has children,
 * - and is clicked while HTML details are hidden.
 *
 * @event syn-hide - Emitted when the navigation item:
 * - has children,
 * - and is clicked while HTML details are shown.
 *
 * @event syn-blur - Emitted when the button loses focus.
 * @event syn-focus - Emitted when the button gains focus.
 *
 * @slot - The navigation item's label.
 * @slot prefix - A presentational prefix icon or similar element.
 * @slot suffix - A presentational suffix icon or similar element.
 * @slot children - Slot used to provide nested child navigation elements.
 * If provided, details and summary elements will be used.
 * A chevron will be shown on the right side regardless of the chevron property.
 *
 * @csspart base - The component's base wrapper including children.
 * @csspart children - The wrapper that holds the children
 * @csspart content-wrapper - The component's content wrapper.
 * @csspart content - The component's content excluding children.
 * @csspart current-indicator - The indicator used when current is set to true
 * @csspart chevron - The container that wraps the chevron.
 * @csspart details - The details element rendered when there are children available
 * @csspart divider - The components optional top divider.
 * @csspart prefix - The container that wraps the prefix.
 * @csspart suffix - The container that wraps the suffix.
 *
 * @cssproperty --indentation - Numeric value, indicating the level the item is placed at.
 * @cssproperty --indentation-stepping - The amount of pixels each level will indent.
 * @cssproperty --display-children - Display property of the children. Defaults to "contents"
 */
export default class SynNavItem extends SynergyElement {
    static styles: CSSResultGroup;
    static dependencies: {
        'syn-divider': typeof SynDivider;
        'syn-icon': typeof SynIcon;
    };
    private readonly hasSlotController;
    private resizeObserver;
    private mutationObserver;
    /**
     * The current focus state
     */
    private hasFocus;
    /**
     * Only the prefix should be displayed
     */
    private showPrefixOnly;
    /**
     * A nested nav-item is marked as current
     */
    private currentMarkedChild;
    /**
     * The content area is multiline
     */
    private isMultiLine;
    /**
     * Reference to the children slot
     */
    childrenSlot: HTMLSlotElement;
    /**
     * Reference to the outermost button
     */
    control: HTMLButtonElement | HTMLLinkElement | HTMLElement;
    /**
     * The navigation item's href target.
     * If provided, the navigation item will use an anchor tag otherwise it will use a button tag.
     *
     * If the 'children' slot is provided, the navigation item will ignore the 'href' and use
     * accordion behavior.
     */
    href: string;
    /** Tells the browser where to open the link. Only used when `href` is present. */
    target: '_blank' | '_parent' | '_self' | '_top';
    /**
     * When using `href`, this attribute will map to the underlying link's `rel` attribute.
     * Unlike regular links, the default is `noreferrer noopener` to prevent security exploits.
     *
     * However, if you're using `target` to point to a specific tab/window,
     * this will prevent that from working correctly.
     *
     * You can remove or change the default value by setting the attribute
     * to an empty string or a value of your choice, respectively.
     */
    rel: string;
    current: boolean;
    /**
     * Disables the navigation item.
     */
    disabled: boolean;
    /**
     * The navigation item's orientation.
     */
    horizontal: boolean;
    /**
     * Appends a chevron to the right side of a navigation item.
     * Only used if `horizontal` is false.
     */
    chevron: boolean;
    /**
     * Reflects HTML details element state and allows control from parent.
     * Only used if `horizontal` is false and `children` is defined.
     */
    open: boolean;
    /**
     * Toggle to true to show a divider above the element.
     * Only available when horizontal is false.
     */
    divider: boolean;
    private isButton;
    private isLink;
    private isAccordion;
    private getNavItemChildren;
    private getAllNestedNavItems;
    private handleCurrentMarkedChild;
    private handleClickButton;
    private handleClickSummary;
    private hideDetails;
    private showDetails;
    /**
     * Automatically add the correct level of indentation for sub items if none is provided
     */
    private handleSlotChange;
    private handleBlur;
    private handleFocus;
    private handleWidth;
    handleHorizontalChange(): void;
    connectedCallback(): void;
    firstUpdated(_changedProperties: PropertyValues): void;
    disconnectedCallback(): void;
    /**
     * Removes focus from the button.
     */
    blur(): void;
    /**
     * Simulates a click on the nav-items button, link or summary.
     */
    click(): void;
    /**
     * Sets focus on the nav-item
     */
    focus(options?: FocusOptions): void;
    render(): import("lit").TemplateResult;
}