Lazy load toots using IntersectionObserver (#3191)

* refactor(components/status_list): Lazy load using IntersectionObserver

* refactor(components/status_list): Avoid setState bottleneck

* refactor(components/status_list): Update state correctly

* fix(components/status): Render if isIntersecting is undefined

* refactor(components/status): Recycle timeout

* refactor(components/status): Reduce animation duration

* refactor(components/status): Use requestIdleCallback

* chore: Split polyfill bundles

* refactor(components/status_list): Increase rootMargin to 300%

* fix(components/status): Check if onRef is not defined

* chore: Add note about polyfill bundle splitting

* fix(components/status): Reduce animation duration to 0.3 seconds
This commit is contained in:
Sorin Davidoi 2017-05-24 17:55:00 +02:00 committed by Eugen Rochko
parent 676ba50601
commit 8e4d1cba00
8 changed files with 146 additions and 13 deletions

View file

@ -32,12 +32,44 @@ class Status extends ImmutablePureComponent {
onOpenMedia: PropTypes.func,
onOpenVideo: PropTypes.func,
onBlock: PropTypes.func,
onRef: PropTypes.func,
isIntersecting: PropTypes.bool,
me: PropTypes.number,
boostModal: PropTypes.bool,
autoPlayGif: PropTypes.bool,
muted: PropTypes.bool,
};
state = {
isHidden: false,
}
componentWillReceiveProps (nextProps) {
if (nextProps.isIntersecting === false && this.props.isIntersecting !== false) {
requestIdleCallback(() => this.setState({ isHidden: true }));
} else {
this.setState({ isHidden: !nextProps.isIntersecting });
}
}
shouldComponentUpdate (nextProps, nextState) {
if (nextProps.isIntersecting === false && this.props.isIntersecting !== false) {
return nextState.isHidden;
}
return true;
}
handleRef = (node) => {
if (this.props.onRef) {
this.props.onRef(node);
if (node && node.children.length !== 0) {
this.height = node.clientHeight;
}
}
}
handleClick = () => {
const { status } = this.props;
this.context.router.push(`/statuses/${status.getIn(['reblog', 'id'], status.get('id'))}`);
@ -52,12 +84,22 @@ class Status extends ImmutablePureComponent {
}
render () {
let media = '';
let media = null;
let statusAvatar;
const { status, account, ...other } = this.props;
const { status, account, isIntersecting, onRef, ...other } = this.props;
const { isHidden } = this.state;
if (status === null) {
return <div />;
return <div ref={this.handleRef} data-id={status.get('id')} />;
}
if (isIntersecting === false && isHidden) {
return (
<div ref={this.handleRef} data-id={status.get('id')} style={{ height: `${this.height}px`, opacity: 0 }}>
{status.getIn(['account', 'display_name']) || status.getIn(['account', 'username'])}
{status.get('content')}
</div>
);
}
if (status.get('reblog', null) !== null && typeof status.get('reblog') === 'object') {
@ -70,7 +112,7 @@ class Status extends ImmutablePureComponent {
const displayNameHTML = { __html: emojify(escapeTextContentForBrowser(displayName)) };
return (
<div className='status__wrapper'>
<div className='status__wrapper' ref={this.handleRef} data-id={status.get('id')} >
<div className='status__prepend'>
<div className='status__prepend-icon-wrapper'><i className='fa fa-fw fa-retweet status__prepend-icon' /></div>
<FormattedMessage id='status.reblogged_by' defaultMessage='{name} boosted' values={{ name: <a onClick={this.handleAccountClick} data-id={status.getIn(['account', 'id'])} href={status.getIn(['account', 'url'])} className='status__display-name muted'><strong dangerouslySetInnerHTML={displayNameHTML} /></a> }} />
@ -98,7 +140,7 @@ class Status extends ImmutablePureComponent {
}
return (
<div className={`status ${this.props.muted ? 'muted' : ''} status-${status.get('visibility')}`}>
<div className={`status ${this.props.muted ? 'muted' : ''} status-${status.get('visibility')}`} data-id={status.get('id')} ref={this.handleRef}>
<div className='status__info'>
<a href={status.get('url')} className='status__relative-time' target='_blank' rel='noopener'><RelativeTimestamp timestamp={status.get('created_at')} /></a>

View file

@ -26,6 +26,12 @@ class StatusList extends ImmutablePureComponent {
trackScroll: true,
};
state = {
isIntersecting: [{ }],
}
statusRefQueue = []
handleScroll = (e) => {
const { scrollTop, scrollHeight, clientHeight } = e.target;
const offset = scrollHeight - scrollTop - clientHeight;
@ -42,6 +48,7 @@ class StatusList extends ImmutablePureComponent {
componentDidMount () {
this.attachScrollListener();
this.attachIntersectionObserver();
}
componentDidUpdate (prevProps) {
@ -52,6 +59,39 @@ class StatusList extends ImmutablePureComponent {
componentWillUnmount () {
this.detachScrollListener();
this.detachIntersectionObserver();
}
attachIntersectionObserver () {
const onIntersection = (entries) => {
this.setState(state => {
const isIntersecting = { };
entries.forEach(entry => {
const statusId = entry.target.getAttribute('data-id');
state.isIntersecting[0][statusId] = entry.isIntersecting;
});
return { isIntersecting: [state.isIntersecting[0]] };
});
};
const options = {
root: this.node,
rootMargin: '300% 0px',
};
this.intersectionObserver = new IntersectionObserver(onIntersection, options);
if (this.statusRefQueue.length) {
this.statusRefQueue.forEach(node => this.intersectionObserver.observe(node));
this.statusRefQueue = [];
}
}
detachIntersectionObserver () {
this.intersectionObserver.disconnect();
}
attachScrollListener () {
@ -66,6 +106,15 @@ class StatusList extends ImmutablePureComponent {
this.node = c;
}
handleStatusRef = (node) => {
if (node && this.intersectionObserver) {
const statusId = node.getAttribute('data-id');
this.intersectionObserver.observe(node);
} else {
this.statusRefQueue.push(node);
}
}
handleLoadMore = (e) => {
e.preventDefault();
this.props.onScrollToBottom();
@ -73,10 +122,11 @@ class StatusList extends ImmutablePureComponent {
render () {
const { statusIds, onScrollToBottom, scrollKey, shouldUpdateScroll, isLoading, isUnread, hasMore, prepend, emptyMessage } = this.props;
const isIntersecting = this.state.isIntersecting[0];
let loadMore = '';
let scrollableArea = '';
let unread = '';
let loadMore = null;
let scrollableArea = null;
let unread = null;
if (!isLoading && statusIds.size > 0 && hasMore) {
loadMore = <LoadMore onClick={this.handleLoadMore} />;
@ -95,7 +145,7 @@ class StatusList extends ImmutablePureComponent {
{prepend}
{statusIds.map((statusId) => {
return <StatusContainer key={statusId} id={statusId} />;
return <StatusContainer key={statusId} id={statusId} isIntersecting={isIntersecting[statusId]} onRef={this.handleStatusRef} />;
})}
{loadMore}

View file

@ -0,0 +1,2 @@
import 'intersection-observer';
import 'requestidlecallback';

View file

@ -1,9 +1,30 @@
import main from '../mastodon/main';
if (!window.Intl || !Object.assign || !Number.isNaN ||
!window.Symbol || !Array.prototype.includes) {
// load polyfills dynamically
import('../mastodon/polyfills').then(main).catch(e => {
const needsBasePolyfills = !(
window.Intl &&
Object.assign &&
Number.isNaN &&
window.Symbol &&
Array.prototype.includes
);
const needsExtraPolyfills = !(
window.IntersectionObserver &&
window.requestIdleCallback
);
// Latest version of Firefox and Safari do not have IntersectionObserver.
// Edge does not have requestIdleCallback.
// This avoids shipping them all the polyfills.
if (needsBasePolyfills) {
Promise.all([
import('../mastodon/base_polyfills'),
import('../mastodon/extra_polyfills'),
]).then(main).catch(e => {
console.error(e); // eslint-disable-line no-console
});
} else if (needsExtraPolyfills) {
import('../mastodon/extra_polyfills').then(main).catch(e => {
console.error(e); // eslint-disable-line no-console
});
} else {

View file

@ -554,6 +554,14 @@
border-bottom: 1px solid lighten($ui-base-color, 8%);
cursor: default;
@keyframes fade {
0% { opacity: 0; }
100% { opacity: 1; }
}
opacity: 1;
animation: fade 0.3s linear;
&.status-direct {
background: lighten($ui-base-color, 8%);

View file

@ -55,6 +55,7 @@
"glob": "^7.1.1",
"http-link-header": "^0.8.0",
"immutable": "^3.8.1",
"intersection-observer": "^0.2.1",
"intl": "^1.2.5",
"is-nan": "^1.2.1",
"js-yaml": "^3.8.3",
@ -92,6 +93,7 @@
"redux": "^3.6.0",
"redux-immutable": "^3.1.0",
"redux-thunk": "^2.2.0",
"requestidlecallback": "^0.3.0",
"reselect": "^2.5.4",
"rimraf": "^2.6.1",
"sass-loader": "^6.0.3",

View file

@ -3341,6 +3341,10 @@ interpret@^1.0.0:
version "1.0.1"
resolved "https://registry.yarnpkg.com/interpret/-/interpret-1.0.1.tgz#d579fb7f693b858004947af39fa0db49f795602c"
intersection-observer@^0.2.1:
version "0.2.1"
resolved "https://registry.yarnpkg.com/intersection-observer/-/intersection-observer-0.2.1.tgz#cb55175f4eebef6436d957a7d1774d39a9248e5e"
intl:
version "1.2.5"
resolved "https://registry.yarnpkg.com/intl/-/intl-1.2.5.tgz#82244a2190c4e419f8371f5aa34daa3420e2abde"
@ -5832,6 +5836,10 @@ request@2, request@2.x, request@^2.74.0, request@^2.79.0:
tunnel-agent "~0.4.1"
uuid "^3.0.0"
requestidlecallback@^0.3.0:
version "0.3.0"
resolved "https://registry.yarnpkg.com/requestidlecallback/-/requestidlecallback-0.3.0.tgz#6fb74e0733f90df3faa4838f9f6a2a5f9b742ac5"
require-directory@^2.1.1:
version "2.1.1"
resolved "https://registry.yarnpkg.com/require-directory/-/require-directory-2.1.1.tgz#8c64ad5fd30dab1c976e2344ffe7f792a6a6df42"