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