ant-design/components/collapse/Collapse.tsx

import * as React from 'react';
import RcCollapse from 'rc-collapse';
import { CSSMotionProps } from 'rc-motion';
import classNames from 'classnames';
import RightOutlined from '@ant-design/icons/RightOutlined';

import toArray from 'rc-util/lib/Children/toArray';
import omit from 'rc-util/lib/omit';
import CollapsePanel, { CollapsibleType } from './CollapsePanel';
import { ConfigContext } from '../config-provider';
import collapseMotion from '../_util/motion';
import { cloneElement } from '../_util/reactNode';

export type ExpandIconPosition = 'left' | 'right' | undefined;

export interface CollapseProps {
  activeKey?: Array<string | number> | string | number;
  defaultActiveKey?: Array<string | number> | string | number;
  /** 手风琴效果 */
  accordion?: boolean;
  destroyInactivePanel?: boolean;
  onChange?: (key: string | string[]) => void;
  style?: React.CSSProperties;
  className?: string;
  bordered?: boolean;
  prefixCls?: string;
  expandIcon?: (panelProps: PanelProps) => React.ReactNode;
  expandIconPosition?: ExpandIconPosition;
  ghost?: boolean;
  collapsible?: CollapsibleType;
}

interface PanelProps {
  isActive?: boolean;
  header?: React.ReactNode;
  className?: string;
  style?: React.CSSProperties;
  showArrow?: boolean;
  forceRender?: boolean;
  /** @deprecated Use `collapsible="disabled"` instead */
  disabled?: boolean;
  extra?: React.ReactNode;
  collapsible?: CollapsibleType;
}

interface CollapseInterface extends React.FC<CollapseProps> {
  Panel: typeof CollapsePanel;
}

const Collapse: CollapseInterface = props => {
  const { getPrefixCls, direction } = React.useContext(ConfigContext);
  const { prefixCls: customizePrefixCls, className = '', bordered = true, ghost } = props;
  const prefixCls = getPrefixCls('collapse', customizePrefixCls);

  const getIconPosition = () => {
    const { expandIconPosition } = props;
    if (expandIconPosition !== undefined) {
      return expandIconPosition;
    }
    return direction === 'rtl' ? 'right' : 'left';
  };

  const renderExpandIcon = (panelProps: PanelProps = {}) => {
    const { expandIcon } = props;
    const icon = (
      expandIcon ? (
        expandIcon(panelProps)
      ) : (
        <RightOutlined rotate={panelProps.isActive ? 90 : undefined} />
      )
    ) as React.ReactNode;

    return (
      // Create additional div here to make arrow align to center of first line
      <div>
        {cloneElement(icon, () => ({
          className: classNames((icon as any).props.className, `${prefixCls}-arrow`),
        }))}
      </div>
    );
  };

  const iconPosition = getIconPosition();
  const collapseClassName = classNames(
    {
      [`${prefixCls}-borderless`]: !bordered,
      [`${prefixCls}-icon-position-${iconPosition}`]: true,
      [`${prefixCls}-rtl`]: direction === 'rtl',
      [`${prefixCls}-ghost`]: !!ghost,
    },
    className,
  );
  const openMotion: CSSMotionProps = {
    ...collapseMotion,
    motionAppear: false,
    leavedClassName: `${prefixCls}-content-hidden`,
  };

  const getItems = () => {
    const { children } = props;
    return toArray(children).map((child: React.ReactElement, index: number) => {
      if (child.props?.disabled) {
        const key = child.key || String(index);
        const { disabled, collapsible } = child.props;
        const childProps: CollapseProps & { key: React.Key } = {
          ...omit(child.props, ['disabled']),
          key,
          collapsible: collapsible ?? (disabled ? 'disabled' : undefined),
        };
        return cloneElement(child, childProps);
      }
      return child;
    });
  };

  return (
    <RcCollapse
      openMotion={openMotion}
      {...props}
      expandIcon={renderExpandIcon}
      prefixCls={prefixCls}
      className={collapseClassName}
    >
      {getItems()}
    </RcCollapse>
  );
};

Collapse.Panel = CollapsePanel;

export default Collapse;