I was creating a project with React and Konva.js but faced the error of "Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons: 1. You might have mismatching versions of React and the renderer (such as React DOM) 2. You might be breaking the Rules of Hooks 3. You might have more than one copy of React in the same app
".
The code I am using is :
import React from "react";
import { Rect, Transformer } from "react-konva";
const Rectangle = ({ shapeProps, isSelected, onSelect, onChange }) => {
const shapeRef = React.useRef();
const trRef = React.useRef();
React.useEffect(() => {
if (isSelected) {
// we need to attach transformer manually
trRef.current.setNode(shapeRef.current);
trRef.current.getLayer().batchDraw();
}
}, [isSelected]);
return (
<React.Fragment>
<Rect
onClick={onSelect}
ref={shapeRef}
{...shapeProps}
draggable
onDragEnd={(e) => {
onChange({
...shapeProps,
x: e.target.x(),
y: e.target.y(),
});
}}
onTransformEnd={(e) => {
// transformer is changing scale
const node = shapeRef.current;
const scaleX = node.scaleX();
const scaleY = node.scaleY();
node.scaleX(1);
node.scaleY(1);
onChange({
...shapeProps,
x: node.x(),
y: node.y(),
width: node.width() * scaleX,
height: node.height() * scaleY,
});
}}
/>
{isSelected && <Transformer ref={trRef} />}
</React.Fragment>
);
};
export default Rectangle;
The error says that there is a problem with
const shapeRef = React.useRef();
const trRef = React.useRef();
but I am unsure if it is a problem
