feat: Added reconnectable edges

Modified edges to support being disconnected and reconnected upon dragging their connection away from the currently connected node.

ref: N25B-114

src/VisualProgrammingUI/VisProgUI.tsx

@@ -1,14 +1,17 @@
 import './VisProgUI.css'
 
-import { useState, useCallback } from 'react';
 import {
+    useCallback,
+    useRef
+} from 'react';
+import {
+    Background,
+    Controls,
     ReactFlow,
-    applyNodeChanges,
-    applyEdgeChanges,
-    addEdge,
-    type NodeChange,
-    type EdgeChange,
-    type Edge, type Connection
+    useNodesState,
+    useEdgesState,
+    reconnectEdge,
+    addEdge, type Edge, type Connection,
 } from '@xyflow/react';
 import '@xyflow/react/dist/style.css';
 
@@ -18,39 +21,55 @@ const initialNodes = [
 ];
 const initialEdges = [{id: 'n1-n2', source: 'n1', target: 'n2'}];
 
-export default function App() {
-    const [nodes, setNodes] = useState(initialNodes);
-    const [edges, setEdges] = useState(initialEdges);
+const VisualProgrammingUI = ()=>  {
+    const edgeReconnectSuccessful = useRef(true);
+    const [nodes, , onNodesChange] = useNodesState(initialNodes);
+    const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
+
 
-    const onNodesChange = useCallback(
-        (changes: NodeChange<{
-            id: string;
-            position: { x: number; y: number; };
-            data: { label: string; };
-        }>[]) => setNodes((nodesSnapshot) => applyNodeChanges(changes, nodesSnapshot)),
-        [],
-    );
-    const onEdgesChange = useCallback(
-        (changes: EdgeChange<{ id: string; source: string; target: string; }>[]) => setEdges((edgesSnapshot) => applyEdgeChanges(changes, edgesSnapshot)),
-        [],
-    );
-    
 
     const onConnect = useCallback(
-        (params: Edge | Connection) => setEdges((edgesSnapshot) => addEdge(params, edgesSnapshot)),
-        [],
+        (params: Edge | Connection) => setEdges((els) => addEdge(params, els)),
+        [setEdges],
     );
 
+    const onReconnectStart = useCallback(() => {
+        edgeReconnectSuccessful.current = false;
+    }, []);
+
+    const onReconnect = useCallback((oldEdge: Edge, newConnection: Connection) => {
+        edgeReconnectSuccessful.current = true;
+        setEdges((els) => reconnectEdge(oldEdge, newConnection, els));
+    }, [setEdges]);
+
+    const onReconnectEnd = useCallback((_: unknown, edge: { id: string; }) => {
+        if (!edgeReconnectSuccessful.current) {
+            setEdges((eds) => eds.filter((e) => e.id !== edge.id));
+        }
+
+        edgeReconnectSuccessful.current = true;
+    }, [setEdges]);
+
     return (
-        <div style={{ width: '100vw', height: '100vh' }}>
+        <div style={{ width: '90vw', height: '90vh' }}>
             <ReactFlow
                 nodes={nodes}
                 edges={edges}
                 onNodesChange={onNodesChange}
                 onEdgesChange={onEdgesChange}
+                snapToGrid
+                onReconnect={onReconnect}
+                onReconnectStart={onReconnectStart}
+                onReconnectEnd={onReconnectEnd}
                 onConnect={onConnect}
                 fitView
-            />
+                attributionPosition="top-right"
+            >
+                <Controls />
+                <Background />
+            </ReactFlow>
         </div>
     );
-}
+};
+
+export default VisualProgrammingUI

src/main.tsx

@@ -1,10 +1,12 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import './index.css'
-import App from './VisualProgrammingUI/VisProgUI.tsx'
+import App from './App.tsx'
+import VisualProgrammingUI from "./VisualProgrammingUI/VisProgUI.tsx";
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
     <App />
+      <VisualProgrammingUI />
   </StrictMode>,
 )