dify/web/app/components/workflow/nodes/loop/node.tsx

import type { FC } from 'react'
import type { LoopNodeType } from './types'
import type { NodeProps } from '@/app/components/workflow/types'
import { cn } from '@langgenius/dify-ui/cn'
import { memo, useEffect } from 'react'
import { Background, useNodesInitialized, useViewport } from 'reactflow'
import { LoopStartNodeDumb } from '../loop-start'
import AddBlock from './add-block'
import { useNodeLoopInteractions } from './use-interactions'

const Node: FC<NodeProps<LoopNodeType>> = ({ id, data }) => {
  const { zoom } = useViewport()
  const nodesInitialized = useNodesInitialized()
  const { handleNodeLoopRerender } = useNodeLoopInteractions()

  useEffect(() => {
    if (nodesInitialized) handleNodeLoopRerender(id)
  }, [nodesInitialized, id, handleNodeLoopRerender])

  return (
    <div
      className={cn(
        'relative h-full min-h-[90px] w-full min-w-[240px] rounded-2xl bg-workflow-canvas-workflow-bg',
      )}
    >
      <Background
        id={`loop-background-${id}`}
        className="z-0! rounded-2xl"
        gap={[14 / zoom, 14 / zoom]}
        size={2 / zoom}
        color="var(--color-workflow-canvas-workflow-dot-color)"
      />
      {data._isCandidate && <LoopStartNodeDumb />}
      {data._children?.length === 1 && <AddBlock loopNodeId={id} loopNodeData={data} />}
    </div>
  )
}

export default memo(Node)