import type { AnimateTranslateCanvasValues, AppState, ScrollConstraints } from "../types";
type CanvasTranslate = Pick<AppState, "scrollX" | "scrollY" | "zoom">;
/**
 * Calculates the scroll center coordinates and the optimal zoom level to fit the constrained scrollable area within the viewport.
 *
 * @param state - The application state.
 * @param scroll - Object containing current scrollX and scrollY.
 * @returns An object with the calculated scrollX, scrollY, and zoom.
 */
export declare const calculateConstrainedScrollCenter: (state: AppState, { scrollX, scrollY }: Pick<AppState, "scrollX" | "scrollY">) => CanvasTranslate;
/**
 * Encodes scroll constraints into a compact string.
 *
 * @param constraints - The scroll constraints to encode.
 * @returns A compact encoded string representing the scroll constraints.
 */
export declare const encodeConstraints: (constraints: ScrollConstraints) => string;
/**
 * Decodes a compact string back into scroll constraints.
 *
 * @param encoded - The encoded string representing the scroll constraints.
 * @returns The decoded scroll constraints object.
 */
export declare const decodeConstraints: (encoded: string) => ScrollConstraints;
/**
 * Constrains the AppState scroll values within the defined scroll constraints.
 *
 * constraintMode can be "elastic", "rigid", or "loose":
 * - "elastic": snaps to constraints but allows overscroll
 * - "rigid": snaps to constraints without overscroll
 * - "loose": allows overscroll and disables animation/snapping to constraints
 *
 * @param state - The original AppState.
 * @param options - Options for allowing overscroll and disabling animation.
 * @returns A new AppState object with constrained scroll values.
 */
export declare const constrainScrollState: (state: AppState, constraintMode?: "elastic" | "rigid" | "loose") => AppState;
/**
 * Checks if two canvas translate values are close within a threshold.
 *
 * @param from - First set of canvas translate values.
 * @param to - Second set of canvas translate values.
 * @returns True if the values are close, false otherwise.
 */
export declare const areCanvasTranslatesClose: (from: AnimateTranslateCanvasValues, to: AnimateTranslateCanvasValues) => boolean;
export {};