|
Server : Apache System : Linux cloud.heroica.com.br 4.18.0-553.36.1.el8_10.x86_64 #1 SMP Wed Jan 22 03:07:54 EST 2025 x86_64 User : farolpborg ( 1053) PHP Version : 7.4.33 Disable Function : exec,passthru,shell_exec,system Directory : /var/www/node_services/datajud/frontend/node_modules/@restart/hooks/esm/ |
Upload File : |
import { useState, useEffect } from 'react';
/**
* Fetch and load an image for programatic use such as in a `<canvas>` element.
*
* @param imageOrUrl The `HtmlImageElement` or image url to load
* @param crossOrigin The `crossorigin` attribute to set
*
* ```ts
* const { image, error } = useImage('/static/kittens.png')
* const ref = useRef<HTMLCanvasElement>()
*
* useEffect(() => {
* const ctx = ref.current.getContext('2d')
*
* if (image) {
* ctx.drawImage(image, 0, 0)
* }
* }, [ref, image])
*
* return (
* <>
* {error && "there was a problem loading the image"}
* <canvas ref={ref} />
* </>
* ```
*/
export default function useImage(imageOrUrl, crossOrigin) {
const [state, setState] = useState({
image: null,
error: null
});
useEffect(() => {
if (!imageOrUrl) return undefined;
let image;
if (typeof imageOrUrl === 'string') {
image = new Image();
if (crossOrigin) image.crossOrigin = crossOrigin;
image.src = imageOrUrl;
} else {
image = imageOrUrl;
if (image.complete && image.naturalHeight > 0) {
setState({
image,
error: null
});
return;
}
}
function onLoad() {
setState({
image,
error: null
});
}
function onError(error) {
setState({
image,
error
});
}
image.addEventListener('load', onLoad);
image.addEventListener('error', onError);
return () => {
image.removeEventListener('load', onLoad);
image.removeEventListener('error', onError);
};
}, [imageOrUrl, crossOrigin]);
return state;
}