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import React from "react";
import ReactDOM from "react-dom";
const symShouldStick = Symbol("shouldStick");
const isAtBottom = v => v.scrollTop + v.clientHeight === v.scrollHeight;
export default Component => Object.assign(class AutoScrollWrapper extends Component {
static displayName = Component.name;
componentWillUpdate() {
const viewport = ReactDOM.findDOMNode(this);
this[symShouldStick] = viewport.scrollTop && isAtBottom(viewport);
super.componentWillUpdate && super.componentWillUpdate();
}
componentDidUpdate() {
const viewport = ReactDOM.findDOMNode(this);
if (this[symShouldStick] && !isAtBottom(viewport)) {
viewport.scrollTop = viewport.scrollHeight;
}
super.componentDidUpdate && super.componentDidUpdate();
}
}, Component);
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