/// <reference types="react" />
import * as React from 'react';
import Input from '../input';
export interface CascaderOptionType {
    value: string;
    label: React.ReactNode;
    disabled?: boolean;
    children?: Array<CascaderOptionType>;
    __IS_FILTERED_OPTION?: boolean;
}
export declare type CascaderExpandTrigger = 'click' | 'hover';
export interface ShowSearchType {
    filter?: (inputValue: string, path: CascaderOptionType[]) => boolean;
    render?: (inputValue: string, path: CascaderOptionType[], prefixCls: string | undefined) => React.ReactNode;
    sort?: (a: CascaderOptionType[], b: CascaderOptionType[], inputValue: string) => number;
    matchInputWidth?: boolean;
}
export interface CascaderProps {
    /**  */
    options: CascaderOptionType[];
    /**  */
    defaultValue?: string[];
    /**  */
    value?: string[];
    /**  */
    onChange?: (value: string[], selectedOptions?: CascaderOptionType[]) => void;
    /**  */
    displayRender?: (label: string[], selectedOptions?: CascaderOptionType[]) => React.ReactNode;
    /**  */
    style?: React.CSSProperties;
    /**  */
    className?: string;
    /**  */
    popupClassName?: string;
    /** ：`bottomLeft` `bottomRight` `topLeft` `topRight` */
    popupPlacement?: string;
    /** */
    placeholder?: string;
    /** ， `large` `default` `small` */
    size?: string;
    /** */
    disabled?: boolean;
    /** */
    allowClear?: boolean;
    showSearch?: boolean | ShowSearchType;
    notFoundContent?: React.ReactNode;
    loadData?: (selectedOptions?: CascaderOptionType[]) => void;
    /** ， 'click'  'hover' */
    expandTrigger?: CascaderExpandTrigger;
    /**  true ， */
    changeOnSelect?: boolean;
    /**  */
    onPopupVisibleChange?: (popupVisible: boolean) => void;
    prefixCls?: string;
    inputPrefixCls?: string;
    getPopupContainer?: (triggerNode?: HTMLElement) => HTMLElement;
    popupVisible?: boolean;
}
export interface CascaderState {
    inputFocused: boolean;
    inputValue: string;
    value: string[];
    popupVisible: boolean | undefined;
    flattenOptions: CascaderOptionType[][];
}
export default class Cascader extends React.Component<CascaderProps, CascaderState> {
    static defaultProps: {
        prefixCls: string;
        inputPrefixCls: string;
        placeholder: string;
        transitionName: string;
        popupPlacement: string;
        options: never[];
        disabled: boolean;
        allowClear: boolean;
        notFoundContent: string;
    };
    cachedOptions: CascaderOptionType[];
    private input;
    constructor(props: CascaderProps);
    componentWillReceiveProps(nextProps: CascaderProps): void;
    handleChange: (value: any, selectedOptions: any[]) => void;
    handlePopupVisibleChange: (popupVisible: boolean) => void;
    handleInputBlur: () => void;
    handleInputClick: (e: React.MouseEvent<HTMLInputElement>) => void;
    handleKeyDown: (e: React.KeyboardEvent<HTMLInputElement>) => void;
    handleInputChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
    setValue: (value: string[], selectedOptions?: any[]) => void;
    getLabel(): any;
    clearSelection: (e: React.MouseEvent<HTMLElement>) => void;
    flattenTree(options: CascaderOptionType[], changeOnSelect: boolean | undefined, ancestor?: CascaderOptionType[]): any;
    generateFilteredOptions(prefixCls: string | undefined): CascaderOptionType[];
    focus(): void;
    blur(): void;
    saveInput: (node: Input) => void;
    render(): JSX.Element;
}