import * as React from "react";
import { Offset, FocusRingShowOpts, FocusRingAncestry, FocusRingStyleProperties, ThemeOptions } from "./FocusRingTypes";
export declare let ACTIVE_RING_CONTEXT_MANAGER: FocusRingContextManager | undefined;
export declare class FocusRingContextManager {
    targetElement?: Element;
    targetAncestry?: FocusRingAncestry;
    boundingBox?: DOMRect;
    className?: string;
    offset: Offset | number;
    zIndex?: number;
    container: Element | null;
    themeOptions?: ThemeOptions;
    invalidate: () => void;
    setContainer(element: Element | null): void;
    setThemeOptions(themeOptions?: ThemeOptions): void;
    showElement(element: Element, opts?: FocusRingShowOpts): void;
    hide(): void;
    get visible(): boolean;
    /**
     * Return the full ancestry of the given element, including both the
     * element ancestors alongside the live computed styles object for
     * each element.
     */
    private getElementAncestors;
    /**
     * To accomodate elements that use z-index to stylistically overlap elements
     * within a single container, this function will calculate the lowest z-index
     * needed to ensure that the focus ring appears at the top of that stacking
     * context. For elements with no stacking context between them and this focus
     * scope's container, no z-index will be applied to the ring.
     */
    private getNextZIndexForAncestry;
    private getBorderRadius;
    private makePositionFromDOMRect;
    /**
     * Return the necessary computed styles for displaying a focus ring as
     * defined by the current state of this ring context.
     */
    getStyle(): FocusRingStyleProperties;
}
declare const FocusRingContext: React.Context<FocusRingContextManager>;
export default FocusRingContext;
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