ant-design/components/tooltip/index.jsx

import React from 'react';
import RcTooltip from 'rc-tooltip';
import getPlacements from '../popover/placements';

const placements = getPlacements({
  verticalArrowShift: 8,
});

export default class Tooltip extends React.Component {
  static defaultProps = {
    prefixCls: 'ant-tooltip',
    placement: 'top',
    mouseEnterDelay: 0.1,
    mouseLeaveDelay: 0.1
  }
  constructor(props) {
    super(props);
    this.state = {
      visible: false
    };
  }
  onVisibleChange = (visible) => {
    this.setState({ visible });
  }
  render() {
    let transitionName = ({
      top: 'zoom-down',
      bottom: 'zoom-up',
      left: 'zoom-right',
      right: 'zoom-left',
      topLeft: 'zoom-down',
      bottomLeft: 'zoom-up',
      leftTop: 'zoom-right',
      rightTop: 'zoom-left',
      topRight: 'zoom-down',
      bottomRight: 'zoom-up',
      leftBottom: 'zoom-right',
      rightBottom: 'zoom-left',
    })[this.props.placement];

    // Hide tooltip when there is no title
    let visible = this.state.visible;
    if (!this.props.title) {
      visible = false;
    }

    return (
      <RcTooltip transitionName={transitionName}
        builtinPlacements={placements}
        overlay={this.props.title}
        visible={visible}
        onVisibleChange={this.onVisibleChange}
        {...this.props}>
        {this.props.children}
      </RcTooltip>
    );
  }
}