feat(flowEditor): 添加节点对齐辅助线功能

- 新增 useAlignmentGuidelines 钩子用于处理对齐逻辑
- 在 ReactFlow 组件中集成对齐辅助线
- 实现节点拖动时动态显示对齐线
- 拖动停止后清除对齐线

src/hooks/useAlignmentGuidelines.tsx

@@ -0,0 +1,125 @@
+import React, { useState, useCallback } from 'react';
+import { Node, useReactFlow } from '@xyflow/react';
+
+interface Guideline {
+  type: 'left' | 'right' | 'center' | 'top' | 'middle' | 'bottom';
+  x?: number;
+  y?: number;
+  from: string;
+  to: string;
+}
+
+interface AlignmentGuidelines {
+  verticalLines: Array<Guideline & { x: number }>;
+  horizontalLines: Array<Guideline & { y: number }>;
+}
+
+const TOLERANCE = 2;
+
+export const useAlignmentGuidelines = () => {
+  const [guidelines, setGuidelines] = useState<AlignmentGuidelines>({
+    verticalLines: [],
+    horizontalLines: []
+  });
+
+  const reactFlowInstance = useReactFlow();
+
+  const clearGuidelines = useCallback(() => {
+    setGuidelines({ verticalLines: [], horizontalLines: [] });
+  }, []);
+
+  const getGuidelines = useCallback((draggingNode: Node, allNodes: Node[]) => {
+    const { position, width = 100, height = 50 } = draggingNode;
+    const { x: dx, y: dy } = position;
+    const dWidth = width;
+    const dHeight = height;
+
+    const verticalLines: Array<Guideline & { x: number }> = [];
+    const horizontalLines: Array<Guideline & { y: number }> = [];
+
+    allNodes.forEach(node => {
+      if (node.id === draggingNode.id) return;
+
+      const { position: pos, measured } = node;
+      const { x, y } = pos;
+      const width2 = measured.width | 0;
+      const height2 = measured.height | 0;
+
+      // 垂直对齐
+      if (Math.abs(dx - x) < TOLERANCE) {
+        verticalLines.push({ type: 'left', x: x - width2 - 1, from: draggingNode.id, to: node.id });
+      }
+
+      // 水平对齐
+      if (Math.abs(dy - y) < TOLERANCE) {
+        horizontalLines.push({ type: 'top', y: y - height2 / 2 - 3, from: draggingNode.id, to: node.id });
+      }
+
+    });
+
+    setGuidelines({ verticalLines, horizontalLines });
+    return { verticalLines, horizontalLines };
+  }, []);
+
+  const AlignmentGuides = () => {
+    // 将节点坐标转换为屏幕坐标
+    const screenVerticalLines = guidelines.verticalLines.map(line => ({
+      ...line,
+      x: reactFlowInstance.flowToScreenPosition({ x: line.x, y: 0 }).x
+    }));
+
+    const screenHorizontalLines = guidelines.horizontalLines.map(line => ({
+      ...line,
+      y: reactFlowInstance.flowToScreenPosition({ x: 0, y: line.y }).y
+    }));
+
+    return (
+      <>
+        {/* 垂直辅助线 */}
+        {screenVerticalLines.map((line, i) => (
+          <div
+            key={`v-${i}`}
+            style={{
+              position: 'absolute',
+              top: 0,
+              bottom: 0,
+              left: `${Math.round(line.x)}px`,
+              width: '1px',
+              backgroundColor: '#2196F3',
+              pointerEvents: 'none',
+              zIndex: 1000,
+              transform: 'translateX(-0.5px)'
+            }}
+          />
+        ))}
+
+        {/* 水平辅助线 */}
+        {screenHorizontalLines.map((line, i) => (
+          <div
+            key={`h-${i}`}
+            style={{
+              position: 'absolute',
+              left: 0,
+              right: 0,
+              top: `${Math.round(line.y)}px`,
+              height: '1px',
+              backgroundColor: '#2196F3',
+              pointerEvents: 'none',
+              zIndex: 1000,
+              transform: 'translateY(-0.5px)'
+            }}
+          />
+        ))}
+      </>
+    );
+  };
+
+  return {
+    guidelines,
+    getGuidelines,
+    clearGuidelines,
+    AlignmentGuides
+  };
+};
+
+export type { AlignmentGuidelines, Guideline };

src/pages/flowEditor/index.tsx

@@ -28,9 +28,10 @@ import NodeContextMenu from './components/nodeContextMenu';
 import EdgeContextMenu from './components/edgeContextMenu';
 import PaneContextMenu from './components/paneContextMenu';
 import NodeEditModal from './components/nodeEditModal';
-import AddNodeMenu from './components/addNodeMenu'; // 添加导入
+import AddNodeMenu from './components/addNodeMenu';
 import { defaultNodeTypes } from '@/pages/flowEditor/node/types/defaultType';
 import { localNodeData } from '@/pages/flowEditor/sideBar/config/localNodeData';
+import { useAlignmentGuidelines } from '@/hooks/useAlignmentGuidelines';
 
 const edgeTypes: EdgeTypes = {
   custom: CustomEdge
@@ -69,6 +70,8 @@ const FlowEditor: React.FC = () => {
   const [edgeForNodeAdd, setEdgeForNodeAdd] = useState<Edge | null>(null);
   const [positionForNodeAdd, setPositionForNodeAdd] = useState<{ x: number, y: number } | null>(null);
 
+  const { getGuidelines, clearGuidelines, AlignmentGuides } = useAlignmentGuidelines();
+
   // 获取handle类型 (api或data)
   const getHandleType = (handleId: string, nodeParams: any) => {
     // 检查是否为api类型的handle
@@ -274,6 +277,20 @@ const FlowEditor: React.FC = () => {
     [reactFlowInstance]
   );
 
+  const onNodeDrag = useCallback(
+    (_: any, node: Node) => {
+      // 获取对齐线
+      getGuidelines(node, nodes);
+    },
+    [nodes, getGuidelines]
+  );
+
+  // 节点拖拽结束处理
+  const onNodeDragStop = useCallback(() => {
+    // 清除对齐线
+    clearGuidelines();
+  }, [clearGuidelines]);
+
   useEffect(() => {
     const { nodes: convertedNodes, edges: convertedEdges } = convertFlowData(exampleFlowData);
     // 为所有边添加类型
@@ -601,12 +618,16 @@ const FlowEditor: React.FC = () => {
         edges={edges}
         nodeTypes={nodeTypes}
         edgeTypes={edgeTypes}
+        snapToGrid={true}
+        snapGrid={[2, 2]}
         onNodesChange={onNodesChange}
         onEdgesChange={onEdgesChange}
         onConnect={onConnect}
         onReconnect={onReconnect}
         onDrop={onDrop}
         onDragOver={onDragOver}
+        onNodeDrag={onNodeDrag}
+        onNodeDragStop={onNodeDragStop}
         onNodeContextMenu={onNodeContextMenu}
         onEdgeContextMenu={onEdgeContextMenu}
         onNodeDoubleClick={onNodeDoubleClick}
@@ -642,6 +663,7 @@ const FlowEditor: React.FC = () => {
           <div>从左侧拖拽节点到画布中</div>
           <Button onClick={saveFlowDataToServer} type="primary">保存</Button>
         </Panel>
+        <AlignmentGuides />
       </ReactFlow>
 
       {/*节点右键上下文*/}