How to make AppBar component from material-ui-next react to scroll events
To my knowledge, there's no out-of-the-box solution for this at the moment. It's quite easy to implement though. Here is a snippet that subscribes to scroll events and hides or shows the AppBar accordingly:
const styles = {
root: {
flexGrow: 1,
},
show: {
transform: 'translateY(0)',
transition: 'transform .5s',
},
hide: {
transform: 'translateY(-110%)',
transition: 'transform .5s',
},
};
class CollapsibleAppBar extends React.PureComponent {
constructor(props) {
super(props);
this.state = {
shouldShow: null,
};
this.lastScroll = null;
this.handleScroll = this.handleScroll.bind(this);
// Alternatively, you can throttle scroll events to avoid
// updating the state too often. Here using lodash.
// this.handleScroll = _.throttle(this.handleScroll.bind(this), 100);
}
componentDidMount() {
window.addEventListener('scroll', this.handleScroll, { passive: true });
}
componentWillUnmount() {
window.removeEventListener('scroll', this.handleScroll);
}
handleScroll(evt) {
const lastScroll = window.scrollY;
if (lastScroll === this.lastScroll) {
return;
}
const shouldShow = (this.lastScroll !== null) ? (lastScroll < this.lastScroll) : null;
if (shouldShow !== this.state.shouldShow) {
this.setState((prevState, props) => ({
...prevState,
shouldShow,
}));
}
this.lastScroll = lastScroll;
}
render() {
const { classes } = this.props;
return (
<AppBar
position="fixed"
color="default"
className={
`${classes.root} ${
this.state.shouldShow === null ? '' : (
this.state.shouldShow ? classes.show : classes.hide
)
}`
}
>
<Toolbar>
<Typography variant="title" color="inherit">
Title
</Typography>
</Toolbar>
</AppBar>
);
}
}
CollapsibleAppBar.propTypes = {
classes: PropTypes.object.isRequired,
};
export default withStyles(styles)(CollapsibleAppBar);
in the current version of Material-ui, you can simply use the following
import clsx from "clsx";
import useScrollTrigger from "@material-ui/core/useScrollTrigger";
const trigger = useScrollTrigger();
<AppBar className={trigger ? classes.show : classes.hide}>
</AppBar>
https://material-ui.com/components/app-bar/#usescrolltrigger-options-trigger