import { Resizer, ResizerOptions, SizingOutput } from '3h-resize';
import { CanvasNodeEvents, CanvasRoot, CanvasRootOptions } from 'canvasom';
import type { SceneNode } from './SceneNode';
/**
 * Type of options of canvas engines.
 */
export declare type CanvasEngineOptions<Events extends CanvasNodeEvents> = (CanvasRootOptions<Events> & Partial<{
    /**
     * The resizer options.
     * @default
     * ```js
     * {
     *     width: this.renderer.width,
     *     height: this.renderer.height,
     *     target: this.renderer.canvas,
     *     sizing: HR.Sizing.contain,
     *     callback: this.onResize,
     * }
     * ```
     */
    resizerOptions: ResizerOptions;
}>);
/** dts2md break */
/**
 * Class of canvas engines.
 */
export declare class CanvasEngine<Events extends CanvasNodeEvents = CanvasNodeEvents> extends CanvasRoot<Events> {
    /** dts2md break */
    /**
     * Constructor of {@link CanvasEngine}.
     */
    constructor(options?: CanvasEngineOptions<Events>);
    /** dts2md break */
    /**
     * The resizer in use.
     */
    readonly resizer: Resizer;
    /** dts2md break */
    /**
     * Current scene.
     */
    currentScene: SceneNode | null;
    /** dts2md break */
    /**
     * Resize callback.
     * (Remember to invoke this in your implemention
     * of `resizer.callback` if you have one.)
     */
    onResize(result: SizingOutput): void;
    /** dts2md break */
    /**
     * Enter specific scene.
     * (Pass `null` to exit current scene
     * without entering another scene.)
     * @returns Whether the scene change is successful.
     */
    enter(nextScene: SceneNode | null): boolean;
}