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import * as React from 'react';
import { withRouter } from 'react-router-dom';
import debounceFn from 'debounce';
type Props = {
scrollCaptureDebounce: number,
scrollSyncDebounce: number,
scrollSyncAttemptLimit: number,
children: React$Node,
history: Object,
location: Object,
onLocationChange: Function,
};
class ScrollManager extends React.Component<Props> {
static defaultProps = {
scrollCaptureDebounce: 50,
scrollSyncDebounce: 100,
scrollSyncAttemptLimit: 5,
};
constructor(props) {
super(props);
this.scrollSyncData = {
x: 0,
y: 0,
attemptsRemaining: props.scrollSyncAttemptLimit,
};
const scrollCapture = () => {
requestAnimationFrame(() => {
const { pageXOffset, pageYOffset } = window;
const { pathname } = this.props.location;
// use browser history instead of router history
// to avoid infinite history.replace loop
const historyState = window.history.state || {};
const { state = {} } = historyState;
if (
!state.scroll ||
state.scroll.x !== pageXOffset ||
state.scroll.y !== pageYOffset
) {
window.history.replaceState(
{
...historyState,
state: { ...state, scroll: { x: pageXOffset, y: pageYOffset } },
},
null,
pathname
);
}
});
};
const _scrollSync = () => {
requestAnimationFrame(() => {
const { x, y, attemptsRemaining } = this.scrollSyncData;
if (attemptsRemaining < 1) {
return;
}
const { pageXOffset, pageYOffset } = window;
if (
y < window.document.body.scrollHeight &&
(x !== pageXOffset || y !== pageYOffset)
) {
window.scrollTo(x, y);
this.scrollSyncData.attemptsRemaining = attemptsRemaining - 1;
_scrollSync();
}
});
};
const scrollSync = (x = 0, y = 0) => {
this.scrollSyncData = {
x,
y,
attemptsRemaining: this.props.scrollSyncAttemptLimit,
};
_scrollSync();
};
this.debouncedScroll = debounceFn(
scrollCapture,
props.scrollCaptureDebounce
);
this.debouncedScrollSync = debounceFn(scrollSync, props.scrollSyncDebounce);
}
componentWillMount() {
const { location, onLocationChange } = this.props;
if (onLocationChange) {
onLocationChange(location);
}
}
componentDidMount() {
this.onPop(this.props);
window.addEventListener('scroll', this.debouncedScroll, { passive: true });
}
componentWillUnmount() {
this.scrollSyncPending = false;
window.removeEventListener('scroll', this.debouncedScroll, {
passive: true,
});
}
componentWillReceiveProps(nextProps) {
switch (nextProps.history.action) {
case 'PUSH':
case 'REPLACE':
this.onPush();
break;
case 'POP':
this.onPop(nextProps);
break;
default:
console.warn(
`Unrecognized location change action! "${nextProps.history.action}"`
);
}
if (nextProps.onLocationChange) {
nextProps.onLocationChange(nextProps.location);
}
}
onPush() {
this.debouncedScrollSync(0, 0);
}
onPop({ location: { state = {} } }) {
// attempt location restore
const { x = 0, y = 0 } = state.scroll || {};
this.debouncedScrollSync(x, y);
}
render() {
return this.props.children;
}
}
export default withRouter(ScrollManager);
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