ant-design/components/layout/Sider.tsx

import React from 'react';
import classNames from 'classnames';
import omit from 'omit.js';
import PropTypes from 'prop-types';
import Icon from '../icon';

export interface SiderProps {
  style?: React.CSSProperties;
  prefixCls?: string;
  className?: string;
  collapsible?: boolean;
  collapsed?: boolean;
  defaultCollapsed?: boolean;
  reverseArrow?: boolean;
  onCollapse?: (collapsed: boolean, type: 'clickTrigger' | 'responsive') => void;
  trigger?: React.ReactNode;
  width?: number | string;
  collapsedWidth?: number | string;
  breakpoint?: 'xs' | 'sm' | 'md' | 'lg' | 'xl';
}

export default class Sider extends React.Component<SiderProps, any> {
  static __ANT_LAYOUT_SIDER: any = true;

  static defaultProps = {
    prefixCls: 'ant-layout-sider',
    collapsible: false,
    defaultCollapsed: false,
    reverseArrow: false,
    width: 200,
    collapsedWidth: 64,
    style: {},
  };

  static childContextTypes = {
    siderCollapsed: PropTypes.bool,
  };

  private mql: any;

  constructor(props) {
    super(props);
    let collapsed;
    if ('collapsed' in props) {
      collapsed = props.collapsed;
    } else {
      collapsed = props.defaultCollapsed;
    }
    this.state = {
      collapsed,
      below: false,
    };
  }

  getChildContext() {
    return {
      siderCollapsed: this.state.collapsed,
    };
  }

  componentWillReceiveProps(nextProps) {
    if ('collapsed' in nextProps) {
      this.setState({
        collapsed: nextProps.collapsed,
      });
    }
  }

  componentDidMount() {
    if (this.mql) {
      this.mql.addListener(this.responsiveHandler);
      this.responsiveHandler(this.mql);
    }
  }

  componentWillUnmount() {
    if (this.mql) {
      this.mql.removeListener(this.responsiveHandler);
    }
  }

  responsiveHandler = (mql) => {
    this.setState({ below: mql.matches });
    if (this.state.collapsed !== mql.matches) {
      this.setCollapsed(mql.matches, 'responsive');
    }
  }

  setCollapsed = (collapsed, type) => {
    if (!('collapsed' in this.props)) {
      this.setState({
        collapsed,
      });
    }
    const { onCollapse } = this.props;
    if (onCollapse) {
      onCollapse(collapsed, type);
    }
  }

  toggle = () => {
    const collapsed = !this.state.collapsed;
    this.setCollapsed(collapsed, 'clickTrigger');
  }

  belowShowChange = () => {
    this.setState({ belowShow: !this.state.belowShow });
  }

  render() {
    const { prefixCls, className,
      collapsible, reverseArrow, trigger, style, width, collapsedWidth,
      ...others,
    } = this.props;
    const divProps = omit(others, ['collapsed',
      'defaultCollapsed', 'onCollapse', 'breakpoint']);
    const siderWidth = this.state.collapsed ? collapsedWidth : width;
    // special trigger when collapsedWidth == 0
    const zeroWidthTrigger = collapsedWidth === 0 || collapsedWidth === '0' ? (
      <span onClick={this.toggle} className={`${prefixCls}-zero-width-trigger`}>
        <Icon type="bars" />
      </span>
    ) : null;
    const iconObj = {
      'expanded': reverseArrow ? <Icon type="right" /> : <Icon type="left" />,
      'collapsed': reverseArrow ? <Icon type="left" /> : <Icon type="right" />,
    };
    const status = this.state.collapsed ? 'collapsed' : 'expanded';
    const defaultTrigger = iconObj[status];
    const triggerDom = (
      trigger !== null ?
      zeroWidthTrigger || (
        <div className={`${prefixCls}-trigger`} onClick={this.toggle} style={{ width: siderWidth }}>
          {trigger || defaultTrigger}
        </div>
      ) : null
    );
    const divStyle = {
      ...style,
      flex: `0 0 ${siderWidth}px`,
      maxWidth: `${siderWidth}px`, // Fix width transition bug in IE11
      minWidth: `${siderWidth}px`, // https://github.com/ant-design/ant-design/issues/6349
      width: `${siderWidth}px`,
    };
    const siderCls = classNames(className, prefixCls, {
      [`${prefixCls}-collapsed`]: !!this.state.collapsed,
      [`${prefixCls}-has-trigger`]: !!trigger,
      [`${prefixCls}-below`]: !!this.state.below,
      [`${prefixCls}-zero-width`]: siderWidth === 0 || siderWidth === '0',
    });
    return (
      <div className={siderCls} {...divProps} style={divStyle}>
        <div className={`${prefixCls}-children`}>{this.props.children}</div>
        {collapsible || (this.state.below && zeroWidthTrigger) ? triggerDom : null}
      </div>
    );
  }
}