/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2012-2018 DragonBones team and other contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
import { OffsetMode } from "../core/index.js";
import { Transform } from "../geom/index.js";
import { BoneData } from "../model/index.js";
import { Armature } from "./Armature.js";
import { TransformObject } from "./TransformObject.js";
/**
 * [en] Bone is one of the most important logical units in the armature animation system,
 * and is responsible for the realization of translate, rotation, scaling in the animations.
 * A armature can contain multiple bones.
 *
 * [zh] 骨骼在骨骼动画体系中是最重要的逻辑单元之一，负责动画中的平移、旋转、缩放的实现。
 * 一个骨架中可以包含多个骨骼。
 *
 * @see BoneData
 * @see Armature
 * @see Slot
 * @version DragonBones 3.0
 */
export declare class Bone extends TransformObject {
    static toString(): string;
    /**
     * [en] The offset mode.
     *
     * [zh] 偏移模式。
     *
     * @see #offset
     * @version DragonBones 5.5
     */
    offsetMode: OffsetMode;
    /**
     * @internal
     */
    readonly animationPose: Transform;
    /**
     * @internal
     */
    _transformDirty: boolean;
    /**
     * @internal
     */
    _childrenTransformDirty: boolean;
    protected _localDirty: boolean;
    /**
     * @internal
     */
    _hasConstraint: boolean;
    protected _visible: boolean;
    protected _cachedFrameIndex: number;
    /**
     * @internal
     */
    _boneData: BoneData;
    /**
     * @private
     */
    protected _parent: Bone | null;
    /**
     * @internal
     */
    _cachedFrameIndices: Array<number> | null;
    protected _onClear(): void;
    protected _updateGlobalTransformMatrix(isCache: boolean): void;
    /**
     * @internal
     */
    _updateAlpha(): void;
    /**
     * @internal
     */
    init(boneData: BoneData, armatureValue: Armature): void;
    /**
     * @internal
     */
    update(cacheFrameIndex: number): void;
    /**
     * @internal
     */
    updateByConstraint(): void;
    /**
     * [en] Forces the bone to update the transform in the next frame.
     * When the bone is not animated or its animation state is finished, the bone will not continue to update,
     * and when the skeleton must be updated for some reason, the method needs to be called explicitly.
     *
     * [zh] 强制骨骼在下一帧更新变换。
     * 当该骨骼没有动画状态或其动画状态播放完成时，骨骼将不在继续更新，而此时由于某些原因必须更新骨骼时，则需要显式调用该方法。
     *
     * @example
     * ```ts
     *     let bone = armature.getBone("arm");
     *     bone.offset.scaleX = 2.0;
     *     bone.invalidUpdate();
     * ```
     * @version DragonBones 3.0
     */
    invalidUpdate(): void;
    /**
     * [en] Check whether the bone contains a specific bone.
     *
     * [zh] 检查该骨骼是否包含特定的骨骼。
     *
     * @see Bone
     * @version DragonBones 3.0
     */
    contains(value: Bone): boolean;
    /**
     * [en] The bone data.
     *
     * [zh] 骨骼数据。
     *
     * @version DragonBones 4.5
     */
    get boneData(): BoneData;
    /**
     * [en] The visible of all slots in the bone.
     *
     * [zh] 此骨骼所有插槽的可见。
     *
     * @default true
     * @see Slot#visible
     * @version DragonBones 3.0
     */
    get visible(): boolean;
    set visible(value: boolean);
    /**
     * [en] The bone name.
     *
     * [zh] 骨骼名称。
     *
     * @version DragonBones 3.0
     */
    get name(): string;
    /**
     * [en] The parent bone to which it belongs.
     *
     * [zh] 所属的父骨骼。
     *
     * @version DragonBones 3.0
     */
    get parent(): Bone | null;
}