import { Entity, Matrix, Vector3 } from "@galacean/engine";
import { AnchorType, CoordinateType, SearchComponentType } from "./enums/GroupState";
/**
 * dirty flag for the group
 */
export declare enum GroupDirtyFlag {
    /**
     * none
     */
    None = 0,
    /**
     * anchor changed
     */
    AnchorDirty = 1,
    /**
     * coordinate changed
     */
    CoordinateDirty = 2,
    /**
     * anchor & coordinate changed
     */
    All = 3
}
/**
 * Group
 */
export declare class Group {
    private static _tempVec30;
    private static _tempMat0;
    private static _tempMat1;
    private static _tempBoundBox;
    _gizmoTransformDirty: boolean;
    private _entities;
    private _listeners;
    private _worldMatrix;
    private _anchorType;
    private _coordinateType;
    private _searchComponentType;
    private _dirtyFlag;
    get entities(): Entity[];
    /**
     * get anchor type
     * @return anchor type, pivot or center
     */
    get anchorType(): AnchorType;
    set anchorType(value: AnchorType);
    /**
     * get coordinate type
     * @return coordinate type, world or local
     */
    get coordinateType(): CoordinateType;
    set coordinateType(value: CoordinateType);
    /**
     * search component type
     * @return current entity or include children
     */
    get searchComponentType(): SearchComponentType;
    set searchComponentType(value: SearchComponentType);
    /**
     * add entity to the group
     * @param addEntity - entity to add
     */
    addEntity(addEntity: Entity): boolean;
    /**
     * add entities to the group
     * @param addEntities - entities to add, in array
     */
    addEntities(addEntities: Entity[]): void;
    /**
     * remove entity from the group
     * @param delEntity - entity to delete
     */
    deleteEntity(delEntity: Entity): void;
    /**
     * remove entities from the group
     * @param delEntities - entities to delete, in array
     */
    deleteEntities(delEntities: Entity[]): void;
    /**
     * get entity index in group
     * @param entity
     * @return number, -1 if not in group
     */
    getIndexOf(entity: Entity): number;
    /**
     * clear the group
     */
    reset(): void;
    /**
     * get group's world matrix
     * @param out - updated world matrix for the group
     * @return boolean, true if group's world matrix needs update
     */
    getWorldMatrix(out?: Matrix): Boolean;
    /**
     * get group's world position
     * @param out - updated world position for the group
     */
    getWorldPosition(out?: Vector3): void;
    /**
     * 获取主要的 Entity，即第一个选中的 Entity
     * @return Entity
     */
    getPrimaryEntity(): Entity;
    /**
     * 从上个状态的矩阵变换到目标矩阵
     * from 矩阵计算所有节点的在本次变换中的 local 姿态
     * to 矩阵计算所有节点的在本次变换后的 world 姿态
     * @param from - 初始矩阵
     * @param to - 目标矩阵
     */
    applyTransform(from: Matrix, to: Matrix): void;
    /**
     * force update group dirty flag
     * @param flag - group dirty flag
     */
    setDirtyFlagTrue(flag: GroupDirtyFlag): void;
    private _applyAdd;
    private _applyDel;
    private _onEntityWorldTransformChange;
    private _hasRelationship;
    private _updateAnchor;
    private _updateCoordinate;
    private _getCenter;
}