import { BaseTransformation } from './_base';
/**
 * The FocusTransformation class implements algorithms for transforming coordinates while the
 * focus is being moved. The currently selection layer range defines the bounds for the focus movement.
 *
 * @class FocusTransformation
 * @private
 */
export declare class FocusTransformation extends BaseTransformation {
    /**
     * Calculates offset coordinates for focus selection based on the current selection state.
     * For header focus selection, calculates offset including headers.
     * For cell focus selection, calculates offset only for selected cells.
     *
     * @returns {{x: number, y: number}}
     */
    calculateOffset(): {
        x: number;
        y: number;
    };
    /**
     * Gets the count of renderable rows for focus transformation.
     * Focus transformation operates on the current selection range.
     *
     * @returns {number}
     */
    countRenderableRows(): number;
    /**
     * Gets the count of renderable columns for focus transformation.
     * Focus transformation operates on the current selection range.
     *
     * @returns {number}
     */
    countRenderableColumns(): number;
    /**
     * Throws an error because focus transformation doesn't support `transformEnd`.
     */
    transformEnd(_rowDelta: number, _colDelta: number): never;
    /**
     * Changes the behavior of the transformation logic by switching the selection layer
     * when the selection is out of range.
     *
     * @returns {boolean}
     */
    shouldSwitchSelectionLayer(): boolean;
}