import React from 'react';
import './style/index';
export interface AffixProps {
    offsetTop?: number;
    offsetBottom?: number;
    style?: React.CSSProperties;
    onChange?: (affixed?: boolean) => void;
    target?: () => Window | HTMLElement | null;
    prefixCls?: string;
    className?: string;
    children: React.ReactNode;
}
declare enum AffixStatus {
    None = 0,
    Prepare = 1
}
export interface AffixState {
    affixStyle?: React.CSSProperties;
    placeholderStyle?: React.CSSProperties;
    status: AffixStatus;
    lastAffix: boolean;
    prevTarget: Window | HTMLElement | null;
}
declare class Affix extends React.Component<AffixProps, AffixState> {
    private timeout;
    state: AffixState;
    private placeholderNode;
    private saveFixedNode;
    private getTargetFunc;
    componentDidMount(): void;
    componentDidUpdate(prevProps: AffixProps): void;
    componentWillUnmount(): void;
    measure: () => void;
    getOffsetTop: () => number | undefined;
    getOffsetBottom: () => number;
    prepareMeasure: () => void;
    updatePosition: () => void;
    lazyUpdatePosition(): void;
    render(): JSX.Element;
}
export default Affix;