import { CSSResultGroup, PropertyValues, TemplateResult, LitElement } from 'lit';

export type SbbOverlayCloseEventDetails = {
    returnValue?: any;
    closeTarget?: HTMLElement;
};
declare const SbbOverlayElement_base: import('../core/mixins.js').AbstractConstructor<import('../core/mixins.js').SbbNegativeMixinType> & typeof LitElement;
/**
 * It displays an interactive overlay element.
 *
 * @slot - Use the unnamed slot to provide a content for the overlay.
 * @event {CustomEvent<void>} willOpen - Emits whenever the `sbb-overlay` starts the opening transition. Can be canceled.
 * @event {CustomEvent<void>} didOpen - Emits whenever the `sbb-overlay` is opened.
 * @event {CustomEvent<void>} willClose - Emits whenever the `sbb-overlay` begins the closing transition. Can be canceled.
 * @event {CustomEvent<SbbOverlayCloseEventDetails>} didClose - Emits whenever the `sbb-overlay` is closed.
 * @event {CustomEvent<void>} requestBackAction - Emits whenever the back button is clicked.
 * @cssprop [--sbb-overlay-z-index=var(--sbb-overlay-default-z-index)] - To specify a custom stack order,
 * the `z-index` can be overridden by defining this CSS variable. The default `z-index` of the
 * component is set to `var(--sbb-overlay-default-z-index)` with a value of `1000`.
 */
export declare class SbbOverlayElement extends SbbOverlayElement_base {
    static styles: CSSResultGroup;
    static readonly events: {
        readonly willOpen: "willOpen";
        readonly didOpen: "didOpen";
        readonly willClose: "willClose";
        readonly didClose: "didClose";
        readonly backClick: "requestBackAction";
    };
    /**
     * Whether to allow the overlay content to stretch to full width.
     * By default, the content has the appropriate page size.
     */
    expanded: boolean;
    /**
     * Whether a back button is displayed next to the title.
     */
    backButton: boolean;
    /**
     * This will be forwarded as aria-label to the close button element.
     */
    accessibilityCloseLabel: string | undefined;
    /**
     * This will be forwarded as aria-label to the back button element.
     */
    accessibilityBackLabel: string | undefined;
    /**
     * This will be forwarded as aria-label adn will describe the purpose of the dialog.
     */
    accessibilityLabel: string | undefined;
    private set _state(value);
    private get _state();
    private _ariaLiveRef;
    private _ariaLiveRefToggle;
    /** Emits whenever the `sbb-overlay` starts the opening transition. */
    private _willOpen;
    /** Emits whenever the `sbb-overlay` is opened. */
    private _didOpen;
    /** Emits whenever the `sbb-overlay` begins the closing transition. */
    private _willClose;
    /** Emits whenever the `sbb-overlay` is closed. */
    private _didClose;
    /** Emits whenever the back button is clicked. */
    private _backClick;
    private _overlayContentElement;
    private _overlayCloseElement?;
    private _overlayController;
    private _openOverlayController;
    private _focusHandler;
    private _scrollHandler;
    private _returnValue;
    private _lastFocusedElement?;
    private _language;
    /**
     * Opens the overlay element.
     */
    open(): void;
    /**
     * Closes the overlay element.
     */
    close(result?: any, target?: HTMLElement): any;
    private _onKeydownEvent;
    connectedCallback(): void;
    disconnectedCallback(): void;
    protected firstUpdated(changedProperties: PropertyValues<this>): void;
    private _removeInstanceFromGlobalCollection;
    private _attachOpenOverlayEvents;
    private _closeOnSbbOverlayCloseClick;
    private _onOverlayAnimationEnd;
    private _setAriaLiveRefContent;
    private _removeAriaLiveRefContent;
    private _setOverlayFocus;
    protected render(): TemplateResult;
}
declare global {
    interface HTMLElementTagNameMap {
        'sbb-overlay': SbbOverlayElement;
    }
}
export {};
//# sourceMappingURL=overlay.d.ts.map