Feature/newnew workflow loop node (#14863)

Co-authored-by: arkunzz <4873204@qq.com>

web/app/components/workflow/nodes/loop/add-block.tsx

@@ -0,0 +1,80 @@
+import {
+  memo,
+  useCallback,
+} from 'react'
+import {
+  RiAddLine,
+} from '@remixicon/react'
+import { useTranslation } from 'react-i18next'
+import {
+  useAvailableBlocks,
+  useNodesInteractions,
+  useNodesReadOnly,
+} from '../../hooks'
+import type { LoopNodeType } from './types'
+import cn from '@/utils/classnames'
+import BlockSelector from '@/app/components/workflow/block-selector'
+
+import type {
+  OnSelectBlock,
+} from '@/app/components/workflow/types'
+import {
+  BlockEnum,
+} from '@/app/components/workflow/types'
+
+type AddBlockProps = {
+  loopNodeId: string
+  loopNodeData: LoopNodeType
+}
+const AddBlock = ({
+  loopNodeData,
+}: AddBlockProps) => {
+  const { t } = useTranslation()
+  const { nodesReadOnly } = useNodesReadOnly()
+  const { handleNodeAdd } = useNodesInteractions()
+  const { availableNextBlocks } = useAvailableBlocks(BlockEnum.Start, false, true)
+
+  const handleSelect = useCallback<OnSelectBlock>((type, toolDefaultValue) => {
+    handleNodeAdd(
+      {
+        nodeType: type,
+        toolDefaultValue,
+      },
+      {
+        prevNodeId: loopNodeData.start_node_id,
+        prevNodeSourceHandle: 'source',
+      },
+    )
+  }, [handleNodeAdd, loopNodeData.start_node_id])
+
+  const renderTriggerElement = useCallback((open: boolean) => {
+    return (
+      <div className={cn(
+        'relative inline-flex items-center px-3 h-8 rounded-lg border-[0.5px] border-gray-50 bg-white shadow-xs cursor-pointer hover:bg-gray-200 text-[13px] font-medium text-gray-700',
+        `${nodesReadOnly && '!cursor-not-allowed opacity-50'}`,
+        open && '!bg-gray-50',
+      )}>
+        <RiAddLine className='mr-1 w-4 h-4' />
+        {t('workflow.common.addBlock')}
+      </div>
+    )
+  }, [nodesReadOnly, t])
+
+  return (
+    <div className='absolute top-7 left-14 flex items-center h-8 z-10'>
+      <div className='group/insert relative w-16 h-0.5 bg-gray-300'>
+        <div className='absolute right-0 top-1/2 -translate-y-1/2 w-0.5 h-2 bg-primary-500'></div>
+      </div>
+      <BlockSelector
+        disabled={nodesReadOnly}
+        onSelect={handleSelect}
+        trigger={renderTriggerElement}
+        triggerInnerClassName='inline-flex'
+        popupClassName='!min-w-[256px]'
+        availableBlocksTypes={availableNextBlocks}
+      />
+    </div>
+  )
+}
+
+export default memo(AddBlock)