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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| import { type MouseEvent as ReactMouseEvent, useCallback, useState } from 'react'; | ||
| import { Edge } from '@xyflow/react'; | ||
| import { StoreSchema } from './types'; | ||
| import { ReactFlowNode } from '../Node/ReactFlowNode'; | ||
|
|
||
| interface IntersectionResult { | ||
| isIntersecting: boolean; | ||
| edge?: Edge; | ||
| edgeElement?: SVGPathElement; | ||
| } | ||
|
|
||
| function isIntersecting( | ||
| edgeRect: DOMRect, | ||
| nodeRect: DOMRect, | ||
| threshold: number = 0.33, | ||
| ): boolean { | ||
| // check if there is any overlap. | ||
| if ( | ||
| edgeRect.left > nodeRect.right || | ||
| edgeRect.right < nodeRect.left || | ||
| edgeRect.top > nodeRect.bottom || | ||
| edgeRect.bottom < nodeRect.top | ||
| ) { | ||
| return false; | ||
| } | ||
|
|
||
| // calculate the overlap area | ||
| const overlapLeft = Math.max(edgeRect.left, nodeRect.left); | ||
| const overlapRight = Math.min(edgeRect.right, nodeRect.right); | ||
| const overlapTop = Math.max(edgeRect.top, nodeRect.top); | ||
| const overlapBottom = Math.min(edgeRect.bottom, nodeRect.bottom); | ||
|
|
||
| const overlapArea = | ||
| (overlapRight - overlapLeft) * (overlapBottom - overlapTop); | ||
| const nodeArea = nodeRect.width * nodeRect.height; | ||
|
|
||
| // calculate the overlap ratio | ||
| const overlapRatio = overlapArea / nodeArea; | ||
|
|
||
| return overlapRatio > threshold; | ||
| } | ||
|
|
||
| export function useDragNode({ | ||
| connect, | ||
| disconnect, | ||
| edges, | ||
| }: { | ||
| connect: StoreSchema['connect']; | ||
| disconnect: StoreSchema['disconnect']; | ||
| edges: StoreSchema['edges']; | ||
| }) { | ||
| const [draggedNode, setDraggedNode] = useState<{ node: any, droppedOnEdge: any } | null>(null); | ||
|
|
||
| const checkNodeEdgeIntersection = useCallback(( | ||
| dragNodeRect: DOMRect, | ||
| ): IntersectionResult => { | ||
| for (const edge of edges) { | ||
| const edgeElement = document.querySelector( | ||
| `[data-id="${edge.id}"]`, | ||
| ) as SVGPathElement; | ||
|
|
||
| if (!edgeElement) continue; | ||
|
|
||
| const edgeRect = edgeElement.getBoundingClientRect(); | ||
| const isEdgeCrossingNode = isIntersecting(edgeRect, dragNodeRect); | ||
|
|
||
| if (isEdgeCrossingNode) { | ||
| return { | ||
| isIntersecting: true, | ||
| edge, | ||
| edgeElement: edgeElement, | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| return { isIntersecting: false }; | ||
| }, [edges.length]); | ||
|
|
||
| const onNodeDrag = useCallback((event: ReactMouseEvent, node: ReactFlowNode) => { | ||
| // @ts-ignore | ||
| const nodeRect = event.target!.getBoundingClientRect() as unknown as DOMRect; | ||
|
|
||
| const { edgeElement, edge, isIntersecting } = checkNodeEdgeIntersection(nodeRect); | ||
|
|
||
| // The node must have inputs and outputs that can be connected | ||
| const isConnected = node.data.inputs.length > 0 && node.data.outputs.length > 0; | ||
|
|
||
| if (isConnected && isIntersecting) { | ||
| edgeElement!.getAttribute('data-testid')?.replace('rf__edge-', ''); | ||
| setDraggedNode({ node, droppedOnEdge: edge }); | ||
| return; | ||
| } | ||
|
|
||
| setDraggedNode(null); | ||
| }, [checkNodeEdgeIntersection]); | ||
|
|
||
| const onNodeDragStop = useCallback((event: any, node: ReactFlowNode, nodes: ReactFlowNode[]) => { | ||
| if (!draggedNode?.droppedOnEdge) return; | ||
| const { node: node1, droppedOnEdge } = draggedNode; | ||
| const nodeOutputId = node.data.outputs[0].id; | ||
| const nodeInputId = node.data.inputs[0].id; | ||
|
|
||
| connect({ | ||
| source: droppedOnEdge.source, | ||
| target: node.id, | ||
| sourceHandle: droppedOnEdge.sourceHandle, | ||
| targetHandle: nodeInputId, | ||
| }); | ||
| connect({ | ||
| source: node.id, | ||
| target: droppedOnEdge.target, | ||
| sourceHandle: nodeOutputId, | ||
| targetHandle: droppedOnEdge.targetHandle, | ||
| }); | ||
|
|
||
| disconnect(droppedOnEdge.id) | ||
| setDraggedNode(null); | ||
| }, [draggedNode, connect, disconnect]); | ||
|
|
||
| return { | ||
| onNodeDrag, | ||
| onNodeDragStop, | ||
| draggedNode, | ||
| } | ||
| } |