import { SyntheticPointerEvent } from '../events';
import { RenderObject } from './render-object';
import { RenderRRect } from './render-rrect';
import { RenderSingleChild } from './render-single-child';
export declare abstract class RenderScrollbar extends RenderSingleChild<RenderRRect> {
    /**
     * 默认样式
     */
    static readonly defaultStyles: {
        readonly thickness: 8;
        readonly rx: 4;
        readonly ry: 4;
        readonly strokeWidth: 1;
        readonly stroke: "rgba(255, 255, 255, 0.6)";
        readonly fill: "rgba(0, 0, 0, 0.2)";
        readonly cursor: "default";
        readonly minGripLength: 20;
    };
    constructor();
    /**
     * 设置或获取滚动条的长度
     */
    get length(): number;
    set length(value: number);
    private _length;
    get thickness(): number;
    set thickness(value: number);
    protected _thickness: number;
    protected abstract computeMoveDelta(lhs: SyntheticPointerEvent<RenderObject>, rhs: SyntheticPointerEvent<RenderObject>): number;
    protected abstract applyLengthAndThickness(length: number, thickness: number): void;
    protected abstract applyGripLengthAndPosition(gripLength: number, gripPosition: number): void;
    private updateGripPositionAndSize;
    get scrollPosition(): number;
    set scrollPosition(value: number);
    private _scrollPosition;
    get contentLength(): number;
    set contentLength(value: number);
    private _contentLength;
    get viewportLength(): number;
    set viewportLength(value: number);
    private _viewportLength;
    get rx(): number;
    set rx(value: number);
    get ry(): number;
    set ry(value: number);
    get strokeWidth(): number | undefined;
    set strokeWidth(value: number | undefined);
    get stroke(): string | undefined;
    set stroke(value: string | undefined);
    get fill(): string | undefined;
    set fill(value: string | undefined);
    /**
     * 用户手动操作滚动条滚动时会调用该方法
     */
    onScroll?: (value: number) => void;
    /**
     * The event triggered when the user manually operates the scrollbar by pressing the mouse.
     */
    onPointerDownGrip?: (grip: RenderRRect) => void;
    /**
     * The event triggered when the user manually operates the scrollbar by releasing the mouse.
     */
    onPointerUpGrip?: (grip: RenderRRect) => void;
    private createGrip;
    protected handleGripPointerDown: (downEvent: SyntheticPointerEvent<RenderObject>) => void;
    /**
     * 抓手的长度 (会被映射成 grip.size.width 或 grip.size.height)
     *
     * 抓手的长度会根据内容和视口比例计算得出
     */
    protected gripLength: number;
    /**
     * 抓手的位置 (会被映射成 grip.position.x 或 grip.position.y)
     */
    protected gripPosition: number;
    /**
     * 轨道的长度
     */
    protected trackScrollAreaLength: number;
    /**
     * 内容的可滚动长度
     */
    protected contentScrollAreaLength: number;
    get grip(): RenderRRect;
}
export declare class RenderHScrollbar extends RenderScrollbar {
    protected computeMoveDelta(lhs: SyntheticPointerEvent<RenderObject>, rhs: SyntheticPointerEvent<RenderObject>): number;
    protected applyLengthAndThickness(length: number, thickness: number): void;
    protected applyGripLengthAndPosition(gripLength: number, gripPosition: number): void;
}
export declare class RenderVScrollbar extends RenderScrollbar {
    protected computeMoveDelta(lhs: SyntheticPointerEvent<RenderObject>, rhs: SyntheticPointerEvent<RenderObject>): number;
    protected applyLengthAndThickness(length: number, thickness: number): void;
    protected applyGripLengthAndPosition(gripLength: number, gripPosition: number): void;
}