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Revert to using upstream's optimisations 

This *does* break things, as `shouldComponentUpdate` assume the
children to never change!
This commit is contained in:
Thibaut Girka 2019-06-30 10:24:56 +02:00 committed by ThibG
parent 0ef6a114e7
commit c0b5ee315d
1 changed files with 15 additions and 11 deletions
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26
app/javascript/flavours/glitch/components/intersection_observer_article.js
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@ -3,8 +3,14 @@ import PropTypes from 'prop-types';
import ImmutablePureComponent from 'react-immutable-pure-component'; import ImmutablePureComponent from 'react-immutable-pure-component';
import scheduleIdleTask from 'flavours/glitch/util/schedule_idle_task'; import scheduleIdleTask from 'flavours/glitch/util/schedule_idle_task';
import getRectFromEntry from 'flavours/glitch/util/get_rect_from_entry'; import getRectFromEntry from 'flavours/glitch/util/get_rect_from_entry';
import { is } from 'immutable';
export default class IntersectionObserverArticle extends ImmutablePureComponent { // Diff these props in the "rendered" state
const updateOnPropsForRendered = ['id', 'index', 'listLength'];
// Diff these props in the "unrendered" state
const updateOnPropsForUnrendered = ['id', 'index', 'listLength', 'cachedHeight'];
export default class IntersectionObserverArticle extends React.Component {
static propTypes = { static propTypes = {
intersectionObserverWrapper: PropTypes.object.isRequired, intersectionObserverWrapper: PropTypes.object.isRequired,
@ -22,20 +28,18 @@ export default class IntersectionObserverArticle extends ImmutablePureComponent
} }
shouldComponentUpdate (nextProps, nextState) { shouldComponentUpdate (nextProps, nextState) {
if (!nextState.isIntersecting && nextState.isHidden) { const isUnrendered = !this.state.isIntersecting && (this.state.isHidden || this.props.cachedHeight);
// It's only if we're not intersecting (i.e. offscreen) and isHidden is true const willBeUnrendered = !nextState.isIntersecting && (nextState.isHidden || nextProps.cachedHeight);
// that either "isIntersecting" or "isHidden" matter, and then they're if (!!isUnrendered !== !!willBeUnrendered) {
// the only things that matter (and updated ARIA attributes). // If we're going from rendered to unrendered (or vice versa) then update
return this.state.isIntersecting || !this.state.isHidden || nextProps.listLength !== this.props.listLength;
} else if (nextState.isIntersecting && !this.state.isIntersecting) {
// If we're going from a non-intersecting state to an intersecting state,
// (i.e. offscreen to onscreen), then we definitely need to re-render
return true; return true;
} }
// Otherwise, diff based on "updateOnProps" and "updateOnStates" // Otherwise, diff based on props
return super.shouldComponentUpdate(nextProps, nextState); const propsToDiff = isUnrendered ? updateOnPropsForUnrendered : updateOnPropsForRendered;
return !propsToDiff.every(prop => is(nextProps[prop], this.props[prop]));
} }
componentDidMount () { componentDidMount () {
const { intersectionObserverWrapper, id } = this.props; const { intersectionObserverWrapper, id } = this.props;