visual-identity/app/components/standard/AppBar.js

import React from 'react';
import PropTypes from 'prop-types';
import { withStyles } from '@material-ui/core/styles';
import AppBar from '@material-ui/core/AppBar';
import Toolbar from '@material-ui/core/Toolbar';
import Typography from '@material-ui/core/Typography';
import Button from '@material-ui/core/Button';
import IconButton from '@material-ui/core/IconButton';
import MenuIcon from '@material-ui/icons/Menu';
import { VotingContext } from '../../context';

const hasSnt = snt => Number(snt.balance) > 0;

const styles = {
  root: {
    flexGrow: 1,
    fontSize: '16px'
  },
  flex: {
    flex: 1,
  },
  menuButton: {
    marginLeft: -12,
    marginRight: 20,
  },
};

function ButtonAppBar(props) {
  const { classes, togglePoll } = props;
  return (
    <VotingContext.Consumer>
      {({ snt, toggleAdmin }) =>
        <div className={classes.root} >
          <AppBar position="static">
            <Toolbar>
              <IconButton className={classes.menuButton} color="inherit" aria-label="Menu">
                <MenuIcon onClick={toggleAdmin} />
              </IconButton>
              <Typography variant="display1" color="inherit" className={classes.flex}>
                What should we build next?
              </Typography>
              {snt && <Button disabled={!hasSnt(snt)} variant="outlined" color="inherit" style={{ fontSize: '16px' }} onClick={togglePoll}>{hasSnt(snt) ? 'Add Proposal' : 'Your account has no SNT'}</Button>}
            </Toolbar>
          </AppBar>
        </div>
      }
    </VotingContext.Consumer>
  );
}

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

export default withStyles(styles)(ButtonAppBar);