import { type NeedleXREventArgs } from "../../engine/xr/api.js";
import { Camera } from "../Camera.js";
import { UIRootComponent } from "./BaseUIComponent.js";
import type { ICanvas, ICanvasEventReceiver, ILayoutGroup, IRectTransform } from "./Interfaces.js";
export declare enum RenderMode {
    ScreenSpaceOverlay = 0,
    ScreenSpaceCamera = 1,
    WorldSpace = 2,
    Undefined = -1
}
/**
 * @category User Interface
 * @group Components
 */
export declare class Canvas extends UIRootComponent implements ICanvas {
    get isCanvas(): boolean;
    get screenspace(): any;
    set renderOnTop(val: boolean);
    get renderOnTop(): boolean;
    private _renderOnTop;
    set depthWrite(val: boolean);
    get depthWrite(): boolean;
    private _depthWrite;
    set doubleSided(val: boolean);
    get doubleSided(): boolean;
    private _doubleSided;
    set castShadows(val: boolean);
    get castShadows(): boolean;
    private _castShadows;
    set receiveShadows(val: boolean);
    get receiveShadows(): boolean;
    private _receiveShadows;
    get renderMode(): RenderMode;
    set renderMode(val: RenderMode);
    private _renderMode;
    private _rootCanvas;
    set rootCanvas(val: Canvas);
    get rootCanvas(): Canvas;
    private _scaleFactor;
    get scaleFactor(): number;
    private set scaleFactor(value);
    worldCamera?: Camera;
    planeDistance: number;
    awake(): void;
    start(): void;
    onEnable(): void;
    onDisable(): void;
    private _boundRenderSettingsChanged;
    private previousParent;
    private _lastMatrixWorld;
    private _rectTransforms;
    registerTransform(rt: IRectTransform): void;
    unregisterTransform(rt: IRectTransform): void;
    private _layoutGroups;
    registerLayoutGroup(group: ILayoutGroup): void;
    unregisterLayoutGroup(group: ILayoutGroup): void;
    private _receivers;
    registerEventReceiver(receiver: ICanvasEventReceiver): void;
    unregisterEventReceiver(receiver: ICanvasEventReceiver): void;
    onEnterXR(args: NeedleXREventArgs): Promise<void>;
    onLeaveXR(args: NeedleXREventArgs): void;
    onBeforeRenderRoutine: () => void;
    onAfterRenderRoutine: () => void;
    private invokeBeforeRenderEvents;
    private handleLayoutUpdates;
    applyRenderSettings(): void;
    private _updateRenderSettingsRoutine?;
    private onRenderSettingsChanged;
    private _updateRenderSettingsDelayed;
    private _activeRenderMode;
    private _lastWidth;
    private _lastHeight;
    private onUpdateRenderMode;
}