accounts-frontend/packages/app/components/ui/loader/ImageLoader.tsx

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import React from 'react';
import classNames from 'classnames';
import { ComponentLoader } from 'app/components/ui/loader';
import { SKIN_LIGHT } from 'app/components/ui';
import styles from './imageLoader.scss';
export default class ImageLoader extends React.Component<
{
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src: string;
alt: string;
ratio: number; // width:height ratio
onLoad?: Function;
},
{
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isLoading: boolean;
}
> {
state = {
isLoading: true,
};
componentWillMount() {
this.preloadImage();
}
preloadImage() {
const img = new Image();
img.onload = () => this.imageLoaded();
img.onerror = () => this.preloadImage();
img.src = this.props.src;
}
imageLoaded() {
this.setState({ isLoading: false });
if (this.props.onLoad) {
this.props.onLoad();
}
}
render() {
const { isLoading } = this.state;
const { src, alt, ratio } = this.props;
return (
<div className={styles.container}>
<div
style={{
height: 0,
paddingBottom: `${ratio * 100}%`,
}}
/>
{isLoading && (
<div className={styles.loader}>
<ComponentLoader skin={SKIN_LIGHT} />
</div>
)}
<div
className={classNames(styles.image, {
[styles.imageLoaded]: !isLoading,
})}
>
<img src={src} alt={alt} />
</div>
</div>
);
}
}