wrapConnectorHooks.js
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import { invariant } from '@react-dnd/invariant';
import { cloneElement, isValidElement } from 'react';
function throwIfCompositeComponentElement(element) {
// Custom components can no longer be wrapped directly in React DnD 2.0
// so that we don't need to depend on findDOMNode() from react-dom.
if (typeof element.type === 'string') {
return;
}
const displayName = element.type.displayName || element.type.name || 'the component';
throw new Error('Only native element nodes can now be passed to React DnD connectors.' + `You can either wrap ${displayName} into a <div>, or turn it into a ` + 'drag source or a drop target itself.');
}
function wrapHookToRecognizeElement(hook) {
return (elementOrNode = null, options = null)=>{
// When passed a node, call the hook straight away.
if (!isValidElement(elementOrNode)) {
const node = elementOrNode;
hook(node, options);
// return the node so it can be chained (e.g. when within callback refs
// <div ref={node => connectDragSource(connectDropTarget(node))}/>
return node;
}
// If passed a ReactElement, clone it and attach this function as a ref.
// This helps us achieve a neat API where user doesn't even know that refs
// are being used under the hood.
const element = elementOrNode;
throwIfCompositeComponentElement(element);
// When no options are passed, use the hook directly
const ref = options ? (node)=>hook(node, options)
: hook;
return cloneWithRef(element, ref);
};
}
export function wrapConnectorHooks(hooks) {
const wrappedHooks = {};
Object.keys(hooks).forEach((key)=>{
const hook = hooks[key];
// ref objects should be passed straight through without wrapping
if (key.endsWith('Ref')) {
wrappedHooks[key] = hooks[key];
} else {
const wrappedHook = wrapHookToRecognizeElement(hook);
wrappedHooks[key] = ()=>wrappedHook
;
}
});
return wrappedHooks;
}
function setRef(ref, node) {
if (typeof ref === 'function') {
ref(node);
} else {
ref.current = node;
}
}
function cloneWithRef(element, newRef) {
const previousRef = element.ref;
invariant(typeof previousRef !== 'string', 'Cannot connect React DnD to an element with an existing string ref. ' + 'Please convert it to use a callback ref instead, or wrap it into a <span> or <div>. ' + 'Read more: https://reactjs.org/docs/refs-and-the-dom.html#callback-refs');
if (!previousRef) {
// When there is no ref on the element, use the new ref directly
return cloneElement(element, {
ref: newRef
});
} else {
return cloneElement(element, {
ref: (node)=>{
setRef(previousRef, node);
setRef(newRef, node);
}
});
}
}
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