ant-design/components/layout/row.tsx

import React, { Children, cloneElement } from 'react';
import classNames from 'classnames';
import assign from 'object-assign';
import splitObject from '../_util/splitObject';
export default class Row extends React.Component {
  static defaultProps = {
    gutter: 0,
  }
  static propTypes = {
    type: React.PropTypes.string,
    align: React.PropTypes.string,
    justify: React.PropTypes.string,
    className: React.PropTypes.string,
    children: React.PropTypes.node,
    gutter: React.PropTypes.number,
  }
  render() {
    const [{type, justify, align, className, gutter, style, children}, others] = splitObject(this.props,
      ['type', 'justify','align', 'className','gutter', 'style','children']);
    const classes = classNames({
      'ant-row': !type,
      [`ant-row-${type}`]: type,
      [`ant-row-${type}-${justify}`]: justify,
      [`ant-row-${type}-${align}`]: align,
      [className]: className,
    });
    const rowStyle = gutter > 0 ? assign({}, {
      marginLeft: gutter / -2,
      marginRight: gutter / -2,
    },style) : style;
    const cols = Children.map(children, col => {
      if (!col) return null;

      return cloneElement(col, {
        style: gutter > 0 ? assign({}, {
          paddingLeft: gutter / 2,
          paddingRight: gutter / 2,
        }, col.props.style) : col.props.style,
      });
    });
    return <div {...others} className={classes} style={rowStyle}>{cols}</div>;
  }
}