import type { Point } from '../../../../json-crdt-extensions/peritext/rga/Point';
import type { ITimestampStruct } from '../../../../json-crdt-patch';
import type { Rect } from '../../../web/types';
/**
 * API which a rendering surface (UI) must implement to be used by the event
 * system.
 */
export interface PeritextUiApi {
    /**
     * Focuses the rendering surface, so that it can receive keyboard input.
     */
    focus?(): void;
    /**
     * Blurs the rendering surface, so that it cannot receive keyboard input.
     */
    blur?(): void;
    /**
     * Finds the position on the screen of a specific character.
     *
     * @param char The index of the character in the text, or a the ID
     *     {@link ITimestampStruct} of the character.
     * @returns The bounding rectangle of the character at the given index.
     */
    getCharRect?(char: number | ITimestampStruct): Rect | undefined;
    /**
     * Returns `true` if text at the given position has right-to-left direction.
     */
    isRTL?(pos: number | Point<string>): boolean;
}
export type UiLineEdge = [point: Point, rect: Rect];
export type UiLineInfo = [left: UiLineEdge, right: UiLineEdge];