问材料-UI的Tabs集成与反应路由器4？

EN

import React from 'react';
import PropTypes from 'prop-types';
import { withStyles } from 'material-ui/styles';
import AppBar from 'material-ui/AppBar';
import Tabs, { Tab } from 'material-ui/Tabs';
import { withRouter } from "react-router-dom";
import Home from "./Home";
import Portfolio from "./Portfolio";

function TabContainer(props) {
  return <div style={{ padding: 20 }}>{props.children}</div>;
}

const styles = theme => ({
  root: {
    flexGrow: 1,
    width: '100%',
    marginTop: theme.spacing.unit * 3,
    backgroundColor: theme.palette.background.paper,
  },
});

class NavTabs extends React.Component {
  state = {
    value: "/",
  };

  componentDidMount() {
    window.onpopstate = ()=> {
      this.setState({
        value: this.props.history.location.pathname
      });
  }
}

  handleChange = (event, value) => {
    this.setState({ value });
    this.props.history.push(value);
  };

  render() {
    const { classes } = this.props;
    const { value } = this.state;

    return (
      <div className={classes.root}>
        <AppBar position="static" color="default">
          <Tabs
            value={value}
            onChange={this.handleChange}
            scrollable
            scrollButtons="on"
            indicatorColor="primary"
            textColor="primary"
          >
            <Tab label="Home" value = "/" />
            <Tab label="Portfolio" value = "/portfolio"/>
          </Tabs>
        </AppBar>
        {value === "/" && <TabContainer>{<Home />}</TabContainer>}
        {value === "/portfolio" && <TabContainer>{<Portfolio />}</TabContainer>}
      </div>
    );
  }
}

NavTabs.propTypes = {
  classes: PropTypes.object.isRequired,
};

export default withRouter(withStyles(styles)(NavTabs));