import { AcApContext } from '../app';
import { AcEdCommand } from '../editor';
/**
 * AutoCAD-style ZOOM command with keyword-driven branches in a single command.
 *
 * Supported flows:
 * - Press Enter: zoom extents.
 * - Pick first corner: zoom window.
 * - Keywords:
 *   - `All` / `Extents`: zoom extents.
 *   - `Window`: prompt two corners and zoom to that box.
 *   - `Center`: prompt center + height/scale factor.
 *   - `Scale`: scale relative to current view (`n`, `nX`, `nXP`).
 *   - `Previous`: restore previous zoom box.
 *
 * This command intentionally keeps all zoom branches in one implementation so
 * callers can use script-style command input such as:
 *
 * ```text
 * zoom
 * window
 * ```
 */
export declare class AcApZoomCmd extends AcEdCommand {
    /**
     * Stores the last view box before a zoom operation so `Previous` can restore it.
     */
    private static previousViewBox?;
    /**
     * Captures current visible world box from the viewport corners.
     *
     * @param context - Current command context.
     * @returns Current view box in world coordinates.
     */
    private captureCurrentViewBox;
    /**
     * Saves current view box before executing a zoom branch.
     *
     * @param context - Current command context.
     */
    private rememberViewBeforeZoom;
    /**
     * Executes extents-like zoom and records previous view for rollback.
     *
     * @param context - Current command context.
     */
    private zoomToExtents;
    /**
     * Executes window zoom from two corner points.
     *
     * @param context - Current command context.
     * @param first - First corner in WCS.
     * @param second - Opposite corner in WCS.
     */
    private zoomToWindow;
    /**
     * Prompts second corner from a known first corner, then performs window zoom.
     *
     * @param context - Current command context.
     * @param firstCorner - First window corner in WCS.
     */
    private promptAndZoomWindowFromFirstCorner;
    /**
     * Prompts a window box using editor `getBox`, then zooms to that box.
     *
     * @param context - Current command context.
     */
    private promptAndZoomWindowByBox;
    /**
     * Handles `Center` branch:
     * - pick center point
     * - input height or scale factor
     *
     * @param context - Current command context.
     */
    private runCenter;
    /**
     * Parses scale factor text from AutoCAD-like inputs:
     * - `2` / `2x` / `2xp`
     *
     * @param raw - Raw user input.
     * @returns Positive scale factor, or `undefined` when invalid.
     */
    private parseScaleFactor;
    /**
     * Applies relative zoom around the specified center (or current view center).
     *
     * @param context - Current command context.
     * @param factor - Relative zoom factor (> 0).
     * @param centerPoint - Optional explicit zoom center in WCS.
     */
    private applyRelativeScale;
    /**
     * Restores previous view box if one exists and swaps buffers to allow toggling.
     *
     * @param context - Current command context.
     */
    private runPrevious;
    /**
     * Runs zoom interaction with keyword-capable branching.
     *
     * @param context - Current command context.
     */
    execute(context: AcApContext): Promise<void>;
}
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