hometown/app/javascript/mastodon/features/ui/components/image_loader.js

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import React from 'react';
import PropTypes from 'prop-types';
class ImageLoader extends React.PureComponent {
static propTypes = {
src: PropTypes.string.isRequired,
}
state = {
loading: true,
error: false,
}
componentWillMount() {
this.loadImage(this.props.src);
}
componentWillReceiveProps(props) {
this.loadImage(props.src);
}
loadImage(src) {
const image = new Image();
image.onerror = () => this.setState({loading: false, error: true});
image.onload = () => this.setState({loading: false, error: false});
image.src = src;
this.lastSrc = src;
this.setState({loading: true});
}
render() {
const { src } = this.props;
const { loading, error } = this.state;
// TODO: handle image error state
const imageClass = `image-loader__img ${loading ? 'image-loader__img-loading' : ''}`;
return <img className={imageClass} src={src} />; // eslint-disable-line jsx-a11y/img-has-alt
}
}
export default ImageLoader;