ant-design/components/tooltip/index.jsx

import React from 'react';
import Tooltip from 'rc-tooltip';

export default React.createClass({
  getDefaultProps() {
    return {
      placement: 'top'
    };
  },
  render() {
    var transitionName = ({
      top: 'zoom-down',
      bottom: 'zoom-up',
      left: 'zoom-right',
      right: 'zoom-left'
    })[this.props.placement];
    return (
      <Tooltip placement={this.props.placement}
        prefixCls="ant-tooltip"
        delay={0.1}
        trigger={this.props.trigger}
        transitionName={transitionName}
        overlay={this.props.title}>
        {this.props.children}
      </Tooltip>
    );
  }
});