Test a Render Prop

michaels-app.jsx

import React from 'react';
import PropTypes from 'prop-types';

// Instead of using a HOC, we can share code using a
// regular component with a render prop!
class Mouse extends React.Component {
  static propTypes = {
    render: PropTypes.func.isRequired,
  };
  state = { x: 0, y: 0 };
  handleMouseMove = event => {
    this.setState({
      x: event.clientX,
      y: event.clientY,
    });
  };
  render() {
    return (
      <div style={{ height: '100%' }} onMouseMove={this.handleMouseMove}>
        {this.props.render(this.state)}
      </div>
    );
  }
}

class App extends React.Component {
  render() {
    return (
      <div style={{ height: '100%' }}>
        <Mouse
          render={({ x, y }) => (
            // The render prop gives us the state we need
            // to render whatever we want here.
            <h1>
              The mouse position is ({x}, {y})
            </h1>
          )}
        />
      </div>
    );
  }
};