feat(flowEditor): 增加初版流程编辑器功能

- 增加开始结束节点，增加编辑器侧边栏

src/pages/flowEditor/index.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useCallback } from 'react';
+import React, { useState, useCallback, useRef } from 'react';
 import {
   ReactFlow,
   applyNodeChanges,
@@ -7,58 +7,78 @@ import {
   Background,
   Controls,
   Node,
-  Edge
+  Edge,
+  ReactFlowProvider,
+  useReactFlow,
+  NodeTypes,
+  Panel
 } from '@xyflow/react';
 import '@xyflow/react/dist/style.css';
 import TextUpdaterNode from './node/textUpdateNode/TextUpdaterNode';
+import StartNode from './node/startNode/StartNode';
+import EndNode from './node/endNode/EndNode';
+import DraggableNode from './node/draggableNode/DraggableNode';
+import SideBar from './sideBar/sideBar';
 
-const nodeTypes = {
-  textUpdater: TextUpdaterNode
+const nodeTypes: NodeTypes = {
+  textUpdater: TextUpdaterNode,
+  start: StartNode,
+  end: EndNode,
+  draggable: DraggableNode
 };
 
 const initialNodes: Node[] = [
   {
-    id: 'n1',
+    id: 'start-node',
     position: { x: 0, y: 0 },
-    data: { label: 'Node 1' },
-    type: 'input'
+    data: { label: '开始' },
+    type: 'start'
+  },
+  {
+    id: 'end-node',
+    position: { x: 300, y: 200 },
+    data: { label: '结束' },
+    type: 'end'
   },
   {
     id: 'node-1',
     type: 'textUpdater',
     position: { x: 150, y: 0 },
     data: { value: 123 }
-  },
-  {
-    id: 'n2',
-    position: { x: 100, y: 100 },
-    data: { label: 'Custom Node' }
   }
 ];
 
 const initialEdges: Edge[] = [
   {
-    id: 'n1-n2',
-    source: 'n1',
-    target: 'n2'
-  },
-  {
-    id: 'n1-node-1',
-    source: 'n1',
+    id: 'start-node-1',
+    source: 'start-node',
     target: 'node-1',
-    targetHandle: 'a'
+    sourceHandle: 'start-source'
   },
   {
-    id: 'n2-node-1',
-    source: 'n2',
-    target: 'node-1',
-    targetHandle: 'a1'
+    id: 'node-1-end',
+    source: 'node-1',
+    target: 'end-node',
+    targetHandle: 'end-target'
   }
 ];
 
+const FlowEditorWithProvider: React.FC = () => {
+  return (
+    <div style={{ width: '100%', height: '91vh', display: 'flex' }}>
+      <ReactFlowProvider>
+        <SideBar />
+        <FlowEditor />
+      </ReactFlowProvider>
+    </div>
+  );
+};
+
 const FlowEditor: React.FC = () => {
   const [nodes, setNodes] = useState<Node[]>(initialNodes);
   const [edges, setEdges] = useState<Edge[]>(initialEdges);
+  const reactFlowInstance = useReactFlow();
+  const reactFlowWrapper = useRef<HTMLDivElement>(null);
 
   const onNodesChange = useCallback(
     (changes: any) => setNodes((nodesSnapshot) => applyNodeChanges(changes, nodesSnapshot)),
@@ -73,8 +93,41 @@ const FlowEditor: React.FC = () => {
     []
   );
 
+  const onDragOver = useCallback((event: React.DragEvent) => {
+    event.preventDefault();
+    event.dataTransfer.dropEffect = 'move';
+  }, []);
+
+  const onDrop = useCallback(
+    (event: React.DragEvent) => {
+      event.preventDefault();
+
+      if (!reactFlowInstance) return;
+
+      const type = event.dataTransfer.getData('application/reactflow');
+      if (typeof type === 'undefined' || !type) {
+        return;
+      }
+
+      const position = reactFlowInstance.screenToFlowPosition({
+        x: event.clientX,
+        y: event.clientY,
+      });
+
+      const newNode = {
+        id: `${type}-${Date.now()}`,
+        type,
+        position,
+        data: { label: `${type} node` },
+      };
+
+      setNodes((nds) => nds.concat(newNode));
+    },
+    [reactFlowInstance]
+  );
+
   return (
-    <div style={{ width: '90vw', height: '91vh' }}>
+    <div ref={reactFlowWrapper} style={{ width: '100%', height: '100%' }}>
       <ReactFlow
         nodes={nodes}
         edges={edges}
@@ -82,13 +135,18 @@ const FlowEditor: React.FC = () => {
         onNodesChange={onNodesChange}
         onEdgesChange={onEdgesChange}
         onConnect={onConnect}
+        onDrop={onDrop}
+        onDragOver={onDragOver}
         fitView
       >
         <Background />
         <Controls />
+        {/*<Panel position="top-right">*/}
+        {/*  <div>从左侧拖拽节点到画布中</div>*/}
+        {/*</Panel>*/}
       </ReactFlow>
     </div>
   );
 };
 
-export default React.memo(FlowEditor);
+export default FlowEditorWithProvider;

src/pages/flowEditor/node/draggableNode/DraggableNode.tsx

@@ -0,0 +1,30 @@
+import React from 'react';
+import { Handle, Position } from '@xyflow/react';
+
+const DraggableNode = ({ data }: { data: any }) => {
+  return (
+    <div style={{ 
+      padding: '10px 20px', 
+      backgroundColor: '#1890ff', 
+      borderRadius: '5px',
+      color: 'white',
+      fontWeight: 'bold'
+    }}>
+      <div>{data.label || '任务节点'}</div>
+      <Handle
+        type="target"
+        position={Position.Left}
+        id="task-target"
+        style={{ background: '#555' }}
+      />
+      <Handle
+        type="source"
+        position={Position.Right}
+        id="task-source"
+        style={{ background: '#555' }}
+      />
+    </div>
+  );
+};
+
+export default DraggableNode;

src/pages/flowEditor/node/endNode/EndNode.tsx

@@ -0,0 +1,24 @@
+import React from 'react';
+import { Handle, Position } from '@xyflow/react';
+
+const EndNode = ({ data }: { data: any }) => {
+  return (
+    <div style={{ 
+      padding: '10px 20px', 
+      backgroundColor: '#ff4d4f', 
+      borderRadius: '5px',
+      color: 'white',
+      fontWeight: 'bold'
+    }}>
+      <div>结束</div>
+      <Handle
+        type="target"
+        position={Position.Left}
+        id="end-target"
+        style={{ background: '#555' }}
+      />
+    </div>
+  );
+};
+
+export default EndNode;

src/pages/flowEditor/node/startNode/StartNode.tsx

@@ -0,0 +1,24 @@
+import React from 'react';
+import { Handle, Position } from '@xyflow/react';
+
+const StartNode = ({ data }: { data: any }) => {
+  return (
+    <div style={{ 
+      padding: '10px 20px', 
+      backgroundColor: '#52c41a', 
+      borderRadius: '5px',
+      color: 'white',
+      fontWeight: 'bold'
+    }}>
+      <div>开始</div>
+      <Handle
+        type="source"
+        position={Position.Right}
+        id="start-source"
+        style={{ background: '#555' }}
+      />
+    </div>
+  );
+};
+
+export default StartNode;

src/pages/flowEditor/sideBar/sideBar.tsx

@@ -0,0 +1,41 @@
+import React from 'react';
+import { Card } from '@arco-design/web-react';
+
+const onDragStart = (event: React.DragEvent, nodeType: string) => {
+  event.dataTransfer.setData('application/reactflow', nodeType);
+  event.dataTransfer.effectAllowed = 'move';
+};
+
+const SideBar: React.FC = () => {
+  return (
+    <div style={{
+      width: 200,
+      padding: 10,
+      borderRight: '1px solid #eee',
+      backgroundColor: '#fafafa'
+    }}>
+      <div style={{ marginBottom: 20 }}>
+        <h3>节点库</h3>
+        <p>将节点拖拽到画布中</p>
+      </div>
+
+      <Card
+        style={{ marginBottom: 10, cursor: 'grab' }}
+        draggable
+        onDragStart={(event) => onDragStart(event, 'draggable')}
+      >
+        <div>任务节点 1</div>
+      </Card>
+
+      <Card
+        style={{ marginBottom: 10, cursor: 'grab' }}
+        draggable
+        onDragStart={(event) => onDragStart(event, 'textUpdater')}
+      >
+        <div>文本节点</div>
+      </Card>
+    </div>
+  );
+};
+
+export default SideBar;