Fix: Fixed the issue where the connection lines of placeholder nodes in the agent canvas could not be displayed #9869 (#10485)

### What problem does this PR solve?

Fix: Fixed the issue where the connection lines of placeholder nodes in
the agent canvas could not be displayed #9869

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/locales/zh.ts

@@ -1619,12 +1619,12 @@ General：实体和关系提取提示来自 GitHub - microsoft/graphrag：基于
       tokenizerRequired: '请先添加Tokenizer节点',
       tokenizerDescription:
         '根据所选的搜索方法，将文本转换为所需的数据结构（例如，用于嵌入搜索的向量嵌入）。',
-      splitter: '分词器拆分器',
+      splitter: '按字符分割',
       splitterDescription:
         '根据分词器长度将文本拆分成块，并带有可选的分隔符和重叠。',
       hierarchicalMergerDescription:
         '使用正则表达式规则按标题层次结构将文档拆分成多个部分，以实现更精细的控制。',
-      hierarchicalMerger: '标题拆分器',
+      hierarchicalMerger: '按标题分割',
       extractor: '提取器',
       extractorDescription:
         '使用 LLM 从文档块（例如摘要、分类等）中提取结构化见解。',

web/src/pages/agent/canvas/edge/index.tsx

@@ -29,9 +29,8 @@ function InnerButtonEdge({
   data,
   sourceHandleId,
 }: EdgeProps<Edge<{ isHovered: boolean }>>) {
-  const deleteEdgeById = useGraphStore((state) => state.deleteEdgeById);
-  const highlightedPlaceholderEdgeId = useGraphStore(
-    (state) => state.highlightedPlaceholderEdgeId,
+  const { deleteEdgeById, getOperatorTypeFromId } = useGraphStore(
+    (state) => state,
   );
 
   const [edgePath, labelX, labelY] = getBezierPath({
@@ -48,12 +47,16 @@ function InnerButtonEdge({
       : {};
   }, [selected]);
 
+  const isTargetPlaceholder = useMemo(() => {
+    return getOperatorTypeFromId(target) === Operator.Placeholder;
+  }, [getOperatorTypeFromId, target]);
+
   const placeholderHighlightStyle = useMemo(() => {
-    const isHighlighted = highlightedPlaceholderEdgeId === id;
+    const isHighlighted = isTargetPlaceholder;
     return isHighlighted
-      ? { strokeWidth: 2, stroke: 'var(--accent-primary)' }
+      ? { strokeWidth: 2, stroke: 'rgb(var(--accent-primary))' }
       : {};
-  }, [highlightedPlaceholderEdgeId, id]);
+  }, [isTargetPlaceholder]);
 
   const onEdgeClick = () => {
     deleteEdgeById(id);
@@ -83,9 +86,10 @@ function InnerButtonEdge({
       data?.isHovered &&
       sourceHandleId !== NodeHandleId.Tool &&
       sourceHandleId !== NodeHandleId.AgentBottom && // The connection between the agent node and the tool node does not need to display the delete button
-      !target.startsWith(Operator.Tool)
+      !target.startsWith(Operator.Tool) &&
+      !isTargetPlaceholder
     );
-  }, [data?.isHovered, sourceHandleId, target]);
+  }, [data?.isHovered, isTargetPlaceholder, sourceHandleId, target]);
 
   return (
     <>

web/src/pages/agent/hooks/use-connection-drag.ts

@@ -1,8 +1,7 @@
-import { Connection, Position } from '@xyflow/react';
+import { Connection, OnConnectEnd, Position } from '@xyflow/react';
 import { useCallback, useRef } from 'react';
 import { useDropdownManager } from '../canvas/context';
 import { Operator, PREVENT_CLOSE_DELAY } from '../constant';
-import useGraphStore from '../store';
 import { useAddNode } from './use-add-node';
 
 interface ConnectionStartParams {
@@ -40,7 +39,6 @@ export const useConnectionDrag = (
 
   const { addCanvasNode } = useAddNode(reactFlowInstance);
   const { setActiveDropdown } = useDropdownManager();
-  const { setHighlightedPlaceholderEdgeId } = useGraphStore();
 
   /**
    * Connection start handler function
@@ -66,8 +64,8 @@ export const useConnectionDrag = (
   /**
    * Connection end handler function
    */
-  const onConnectEnd = useCallback(
-    (event: MouseEvent | TouchEvent) => {
+  const onConnectEnd: OnConnectEnd = useCallback(
+    (event) => {
       if ('clientX' in event && 'clientY' in event) {
         const { clientX, clientY } = event;
         setDropdownPosition({ x: clientX, y: clientY });
@@ -113,11 +111,6 @@ export const useConnectionDrag = (
 
           if (newNodeId) {
             setCreatedPlaceholderRef(newNodeId);
-
-            if (connectionStartRef.current) {
-              const edgeId = `xy-edge__${connectionStartRef.current.nodeId}${connectionStartRef.current.handleId}-${newNodeId}end`;
-              setHighlightedPlaceholderEdgeId(edgeId);
-            }
           }
 
           // Calculate placeholder node position and display dropdown menu
@@ -154,7 +147,6 @@ export const useConnectionDrag = (
       calculateDropdownPosition,
       setActiveDropdown,
       showModal,
-      setHighlightedPlaceholderEdgeId,
       checkAndRemoveExistingPlaceholder,
       removePlaceholderNode,
       hideModal,
@@ -206,13 +198,7 @@ export const useConnectionDrag = (
     removePlaceholderNode();
     hideModal();
     clearActiveDropdown();
-    setHighlightedPlaceholderEdgeId(null);
-  }, [
-    removePlaceholderNode,
-    hideModal,
-    clearActiveDropdown,
-    setHighlightedPlaceholderEdgeId,
-  ]);
+  }, [removePlaceholderNode, hideModal, clearActiveDropdown]);
 
   return {
     onConnectStart,

web/src/pages/agent/hooks/use-placeholder-manager.ts

@@ -42,9 +42,6 @@ export const usePlaceholderManager = (reactFlowInstance: any) => {
         });
       }
 
-      // Clear highlighted placeholder edge
-      useGraphStore.getState().setHighlightedPlaceholderEdgeId(null);
-
       // Update ref reference
       if (createdPlaceholderRef.current === existingPlaceholder.id) {
         createdPlaceholderRef.current = null;
@@ -62,8 +59,7 @@ export const usePlaceholderManager = (reactFlowInstance: any) => {
       reactFlowInstance &&
       !userSelectedNodeRef.current
     ) {
-      const { nodes, edges, setHighlightedPlaceholderEdgeId } =
-        useGraphStore.getState();
+      const { nodes, edges } = useGraphStore.getState();
 
       // Remove edges related to placeholder
       const edgesToRemove = edges.filter(
@@ -84,8 +80,6 @@ export const usePlaceholderManager = (reactFlowInstance: any) => {
         });
       }
 
-      setHighlightedPlaceholderEdgeId(null);
-
       createdPlaceholderRef.current = null;
     }
 
@@ -101,13 +95,7 @@ export const usePlaceholderManager = (reactFlowInstance: any) => {
     (newNodeId: string) => {
       // First establish connection between new node and source, then delete placeholder
       if (createdPlaceholderRef.current && reactFlowInstance) {
-        const {
-          nodes,
-          edges,
-          addEdge,
-          updateNode,
-          setHighlightedPlaceholderEdgeId,
-        } = useGraphStore.getState();
+        const { nodes, edges, addEdge, updateNode } = useGraphStore.getState();
 
         // Find placeholder node to get its position
         const placeholderNode = nodes.find(
@@ -157,8 +145,6 @@ export const usePlaceholderManager = (reactFlowInstance: any) => {
             edges: edgesToRemove,
           });
         }
-
-        setHighlightedPlaceholderEdgeId(null);
       }
 
       // Mark that user has selected a node

web/src/pages/agent/store.ts

@@ -39,7 +39,6 @@ export type RFState = {
   selectedEdgeIds: string[];
   clickedNodeId: string; // currently selected node
   clickedToolId: string; // currently selected tool id
-  highlightedPlaceholderEdgeId: string | null;
   onNodesChange: OnNodesChange<RAGFlowNodeType>;
   onEdgesChange: OnEdgesChange;
   onEdgeMouseEnter?: EdgeMouseHandler<Edge>;
@@ -90,7 +89,6 @@ export type RFState = {
   ) => void; // Deleting a condition of a classification operator will delete the related edge
   findAgentToolNodeById: (id: string | null) => string | undefined;
   selectNodeIds: (nodeIds: string[]) => void;
-  setHighlightedPlaceholderEdgeId: (edgeId: string | null) => void;
 };
 
 // this is our useStore hook that we can use in our components to get parts of the store and call actions
@@ -103,7 +101,6 @@ const useGraphStore = create<RFState>()(
       selectedEdgeIds: [] as string[],
       clickedNodeId: '',
       clickedToolId: '',
-      highlightedPlaceholderEdgeId: null,
       onNodesChange: (changes) => {
         set({
           nodes: applyNodeChanges(changes, get().nodes),
@@ -530,9 +527,6 @@ const useGraphStore = create<RFState>()(
           })),
         );
       },
-      setHighlightedPlaceholderEdgeId: (edgeId) => {
-        set({ highlightedPlaceholderEdgeId: edgeId });
-      },
     })),
     { name: 'graph', trace: true },
   ),