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Revert 4a48d03b31 (fixes #348)

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Since 4a48d03b31, IntersectionObserverArticle
assumes that its children do not change unless the number of children changes.

This is not the case with the notification overlay, which resulted in the
checkmark of notification cleaning mode not updating unless scrolling to make
notifications appear/disappear.

This change may negatively impact performances.
This commit is contained in:
Thibaut Girka 2018-02-10 20:56:48 +01:00
parent 98c57e4d92
commit da0a577768
1 changed files with 12 additions and 14 deletions
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26
app/javascript/flavours/glitch/components/intersection_observer_article.js
View file

@ -1,15 +1,10 @@
import React from 'react';
import PropTypes from 'prop-types';
import ImmutablePureComponent from 'react-immutable-pure-component';
import scheduleIdleTask from 'flavours/glitch/util/schedule_idle_task';
import getRectFromEntry from 'flavours/glitch/util/get_rect_from_entry';
import { is } from 'immutable';
// 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 {
export default class IntersectionObserverArticle extends ImmutablePureComponent {
static propTypes = {
intersectionObserverWrapper: PropTypes.object.isRequired,
@ -27,15 +22,18 @@ export default class IntersectionObserverArticle extends React.Component {
}
shouldComponentUpdate (nextProps, nextState) {
const isUnrendered = !this.state.isIntersecting && (this.state.isHidden || this.props.cachedHeight);
const willBeUnrendered = !nextState.isIntersecting && (nextState.isHidden || nextProps.cachedHeight);
if (!!isUnrendered !== !!willBeUnrendered) {
// If we're going from rendered to unrendered (or vice versa) then update
if (!nextState.isIntersecting && nextState.isHidden) {
// It's only if we're not intersecting (i.e. offscreen) and isHidden is true
// that either "isIntersecting" or "isHidden" matter, and then they're
// the only things that matter (and updated ARIA attributes).
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;
}
// Otherwise, diff based on props
const propsToDiff = isUnrendered ? updateOnPropsForUnrendered : updateOnPropsForRendered;
return !propsToDiff.every(prop => is(nextProps[prop], this.props[prop]));
// Otherwise, diff based on "updateOnProps" and "updateOnStates"
return super.shouldComponentUpdate(nextProps, nextState);
}
componentDidMount () {