madiator.com/ui/effects/use-zoom.js

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JavaScript
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2021-08-16 12:11:25 +02:00
import { useEffect } from 'react';
import { changeZoomFactor, ZOOM } from 'util/zoomWindow';
export default function useHover(ref) {
useEffect(() => {
const handleKeyPress = e => {
if (e.ctrlKey && !e.shiftKey) {
switch (e.code) {
case 'NumpadAdd':
case 'Equal':
e.preventDefault();
changeZoomFactor(ZOOM.INCREMENT);
break;
case 'NumpadSubtract':
case 'Minus':
e.preventDefault();
changeZoomFactor(ZOOM.DECREMENT);
break;
case 'Numpad0':
case 'Digit0':
e.preventDefault();
changeZoomFactor(ZOOM.RESET);
break;
default:
// Do nothing
break;
}
}
};
window.addEventListener('keydown', handleKeyPress);
return () => window.removeEventListener('keydown', handleKeyPress);
}, []);
useEffect(() => {
const handleWheel = e => {
if (e.ctrlKey && !e.shiftKey) {
if (e.deltaY < 0) {
changeZoomFactor(ZOOM.INCREMENT);
} else {
changeZoomFactor(ZOOM.DECREMENT);
}
}
};
window.addEventListener('wheel', handleWheel);
return () => window.removeEventListener('wheel', handleWheel);
}, []);
useEffect(() => {
changeZoomFactor(ZOOM.LOAD_FROM_LOCAL_STORAGE);
}, []);
}