import { Context } from "../../engine/engine_setup.js";
import { Behaviour } from "../Component.js";
import { type IPointerEventHandler, PointerEventData } from "./PointerEvents.js";
import { Raycaster } from "./Raycaster.js";
export declare enum EventSystemEvents {
    BeforeHandleInput = "BeforeHandleInput",
    AfterHandleInput = "AfterHandleInput"
}
export declare type AfterHandleInputEvent = {
    sender: EventSystem;
    args: PointerEventData;
    hasActiveUI: boolean;
};
/**
 * [EventSystem](https://engine.needle.tools/docs/api/EventSystem) is responsible for managing and dispatching input events to UI components within the scene.
 * @summary Manages and dispatches input events to UI components
 * @category User Interface
 * @group Components
 */
export declare class EventSystem extends Behaviour {
    static ensureUpdateMeshUI(instance: any, context: Context, force?: boolean): void;
    static markUIDirty(_context: Context): void;
    static createIfNoneExists(context: Context): void;
    static get(ctx: Context): EventSystem | null;
    /** Get the currently active event system */
    static get instance(): EventSystem | null;
    private readonly raycaster;
    register(rc: Raycaster): void;
    unregister(rc: Raycaster): void;
    get hasActiveUI(): boolean;
    get isHoveringObjects(): boolean;
    awake(): void;
    start(): void;
    onEnable(): void;
    onDisable(): void;
    /**
     * all pointers that have pressed something
     *
     * key: pointerId
     * value: object that was pressed, data of the pointer event, handlers that are releavant to the event
    */
    private pressedByID;
    /**
     * all hovered objects
     *
     * key: pointerId
     * value: object that is hovered, data of the pointer event
     */
    private hoveredByID;
    onBeforeRender(): void;
    /**
     * Handle an pointer event from the input system
     */
    private onPointerEvent;
    private readonly _sortedHits;
    /**
     * cache for objects that we want to raycast against. It's cleared before each call to performRaycast invoking raycasters
     */
    private readonly _testObjectsCache;
    /** that's the raycaster that is CURRENTLY being used for raycasting (the shouldRaycastObject method uses this) */
    private _currentlyActiveRaycaster;
    private _currentPointerEventName;
    /**
     * Checks if an object that we encounter has an event component and if it does, we add it to our objects cache
     * If it doesnt we tell our raycasting system to ignore it and continue in the child hierarchy
     * We do this to avoid raycasts against objects that are not going to be used by the event system
     * Because there's no component callback to be invoked anyways.
     * This is especially important to avoid expensive raycasts against SkinnedMeshes
     *
     * Further optimizations would be to check what type of event we're dealing with
     * For example if an event component has only an onPointerClick method we don't need to raycast during movement events
     * */
    private shouldRaycastObject;
    private shouldRaycastObject_AddToYesCache;
    /** the raycast filter is always overriden */
    private performRaycast;
    private assignHitInformation;
    private handleIntersections;
    private _sortingBuffer;
    private _noDepthTestingResults;
    private sortCandidates;
    private out;
    /**
     * Handle hit result by preparing all needed information before propagation.
     * Then calling propagate.
     */
    private handleEventOnObject;
    /**
     * Propagate up in hiearchy and call the callback for each component that is possibly a handler
     */
    private propagate;
    /**
     * Propagate up in hierarchy and call handlers based on the pointer event data
     */
    private handleMainInteraction;
    /** Propagate up in hierarchy and call onPointerExit */
    private propagatePointerExit;
    /** handles onPointerUp - this will also release the pointerCapture */
    private invokeOnPointerUp;
    /** Responsible for invoking onPointerEnter (and updating onPointerExit). We invoke onPointerEnter once per active pointerId */
    private handlePointerEnter;
    /** Responsible for invoking onPointerExit (and updating onPointerEnter). We invoke onPointerExit once per active pointerId */
    private handlePointerExit;
    /** updates the pointer state list for a component
     * @param comp the component to update
     * @param pointerId the pointerId to update
     * @param symbol the symbol to use for the state
     * @param add if true, the pointerId is added to the state list, if false the pointerId will be removed
     */
    private updatePointerState;
    /** the list of component handlers that requested pointerCapture for a specific pointerId */
    private readonly _capturedPointer;
    /** check if the event was marked to be captured: if yes add the current component to the captured list */
    private handlePointerCapture;
    /** removes the component from the pointer capture list */
    releasePointerCapture(evt: PointerEventData, component: IPointerEventHandler): void;
    /** invoke the pointerMove event on all captured handlers */
    private invokePointerCapture;
    private readonly pointerEnterSymbol;
    private readonly pointerExitSymbol;
    private isChild;
    private handleMeshUiObjectWithoutShadowDom;
    private currentActiveMeshUIComponents;
    private handleMeshUIIntersection;
    private resetMeshUIStates;
    private testIsVisible;
}