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Replace repetitive blurhash code with component (#14267)

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This commit replaces all unnecessarily repeated code for decoding and
embedding blurhash canvases with separate component - <Blurhash>.

Under the hood Blurhash component will use effect dependent on its
props. This gives a few benefits: it will only be re-rendered whenever
the hash or width/height/dummy props update, and will not render if
canvas won't get to the final DOM, because then effect won't fire,
which prevents weird bugs like #14257.
This commit is contained in:
Sasha Sorokin 2020-07-09 18:01:30 +07:00 • committed by GitHub
parent 5b7a93b02c
commit 61c07c3731
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 102 additions and 125 deletions
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40
app/javascript/mastodon/features/account_gallery/components/media_item.js
View file

@ -1,7 +1,7 @@
import { decode } from 'blurhash';
import Blurhash from 'mastodon/components/blurhash';
import classNames from 'classnames';
import Icon from 'mastodon/components/icon';
import { autoPlayGif, displayMedia } from 'mastodon/initial_state';
import { autoPlayGif, displayMedia, useBlurhash } from 'mastodon/initial_state';
import { isIOS } from 'mastodon/is_mobile';
import PropTypes from 'prop-types';
import React from 'react';
@ -21,34 +21,6 @@ export default class MediaItem extends ImmutablePureComponent {
loaded: false,
};
componentDidMount () {
if (this.props.attachment.get('blurhash')) {
this._decode();
}
}
componentDidUpdate (prevProps) {
if (prevProps.attachment.get('blurhash') !== this.props.attachment.get('blurhash') && this.props.attachment.get('blurhash')) {
this._decode();
}
}
_decode () {
const hash = this.props.attachment.get('blurhash');
const pixels = decode(hash, 32, 32);
if (pixels) {
const ctx = this.canvas.getContext('2d');
const imageData = new ImageData(pixels, 32, 32);
ctx.putImageData(imageData, 0, 0);
}
}
setCanvasRef = c => {
this.canvas = c;
}
handleImageLoad = () => {
this.setState({ loaded: true });
}
@ -152,7 +124,13 @@ export default class MediaItem extends ImmutablePureComponent {
return (
<div className='account-gallery__item' style={{ width, height }}>
<a className='media-gallery__item-thumbnail' href={status.get('url')} onClick={this.handleClick} title={title} target='_blank' rel='noopener noreferrer'>
<canvas width={32} height={32} ref={this.setCanvasRef} className={classNames('media-gallery__preview', { 'media-gallery__preview--hidden': visible && loaded })} />
<Blurhash
hash={attachment.get('blurhash')}
className={classNames('media-gallery__preview', {
'media-gallery__preview--hidden': visible && loaded,
})}
dummy={!useBlurhash}
/>
{visible && thumbnail}
{!visible && icon}
</a>