chore(examples): add layouting with new api

example/src/Layouting/index.tsx

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+import { useState, useCallback } from 'react';
+import ReactFlow, {
+  ReactFlowProvider,
+  addEdge,
+  applyNodeChanges,
+  applyEdgeChanges,
+  Controls,
+  NodeChange,
+  EdgeChange,
+  Node,
+  Connection,
+  Edge,
+  NodeExtent,
+  Position,
+} from 'react-flow-renderer';
+import dagre from 'dagre';
+
+import initialNodesAndEdges from './initial-elements';
+
+import './layouting.css';
+
+const dagreGraph = new dagre.graphlib.Graph();
+dagreGraph.setDefaultEdgeLabel(() => ({}));
+
+const nodeExtent: NodeExtent = [
+  [0, 0],
+  [1000, 1000],
+];
+
+const LayoutFlow = () => {
+  const [nodes, setNodes] = useState<Node[]>(initialNodesAndEdges.nodes);
+  const [edges, setEdges] = useState<Edge[]>(initialNodesAndEdges.edges);
+
+  const onConnect = useCallback((params: Edge | Connection) => {
+    setEdges((eds) => {
+      return addEdge(params, eds);
+    });
+  }, []);
+
+  const onLayout = (direction: string) => {
+    const isHorizontal = direction === 'LR';
+    dagreGraph.setGraph({ rankdir: direction });
+
+    nodes.forEach((node) => {
+      dagreGraph.setNode(node.id, { width: 150, height: 50 });
+    });
+
+    edges.forEach((edge) => {
+      dagreGraph.setEdge(edge.source, edge.target);
+    });
+
+    dagre.layout(dagreGraph);
+
+    const layoutedNodes = nodes.map((node) => {
+      const nodeWithPosition = dagreGraph.node(node.id);
+      node.targetPosition = isHorizontal ? Position.Left : Position.Top;
+      node.sourcePosition = isHorizontal ? Position.Right : Position.Bottom;
+      // we need to pass a slightly different position in order to notify react flow about the change
+      // @TODO how can we change the position handling so that we dont need this hack?
+      node.position = { x: nodeWithPosition.x + Math.random() / 1000, y: nodeWithPosition.y };
+
+      return node;
+    });
+
+    setNodes(layoutedNodes);
+  };
+
+  const onNodesChange = useCallback((changes: NodeChange[]) => setNodes((ns) => applyNodeChanges(changes, ns)), []);
+
+  const onEdgesChange = useCallback((changes: EdgeChange[]) => {
+    setEdges((es) => applyEdgeChanges(changes, es));
+  }, []);
+
+  return (
+    <div className="layoutflow">
+      <ReactFlowProvider>
+        <ReactFlow
+          nodes={nodes}
+          edges={edges}
+          onConnect={onConnect}
+          nodeExtent={nodeExtent}
+          onLoad={() => onLayout('TB')}
+          onNodesChange={onNodesChange}
+          onEdgesChange={onEdgesChange}
+        >
+          <Controls />
+        </ReactFlow>
+        <div className="controls">
+          <button onClick={() => onLayout('TB')} style={{ marginRight: 10 }}>
+            vertical layout
+          </button>
+          <button onClick={() => onLayout('LR')}>horizontal layout</button>
+        </div>
+      </ReactFlowProvider>
+    </div>
+  );
+};
+
+export default LayoutFlow;

example/src/Layouting/initial-elements.ts

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+import { Node, Edge, XYPosition } from 'react-flow-renderer';
+
+const position: XYPosition = { x: 0, y: 0 };
+
+const nodes: Node[] = [
+  {
+    id: '1',
+    type: 'input',
+    data: { label: 'input' },
+    position,
+  },
+  {
+    id: '2',
+    data: { label: 'node 2' },
+    position,
+  },
+  {
+    id: '2a',
+    data: { label: 'node 2a' },
+    position,
+  },
+  {
+    id: '2b',
+    data: { label: 'node 2b' },
+    position,
+  },
+  {
+    id: '2c',
+    data: { label: 'node 2c' },
+    position,
+  },
+  {
+    id: '2d',
+    data: { label: 'node 2d' },
+    position,
+  },
+  {
+    id: '3',
+    data: { label: 'node 3' },
+    position,
+  },
+  {
+    id: '4',
+    data: { label: 'node 4' },
+    position,
+  },
+  {
+    id: '5',
+    data: { label: 'node 5' },
+    position,
+  },
+  {
+    id: '6',
+    type: 'output',
+    data: { label: 'output' },
+    position,
+  },
+  { id: '7', type: 'output', data: { label: 'output' }, position: { x: 400, y: 450 } },
+];
+
+const edges: Edge[] = [
+  { id: 'e12', source: '1', target: '2', type: 'smoothstep' },
+  { id: 'e13', source: '1', target: '3', type: 'smoothstep' },
+  { id: 'e22a', source: '2', target: '2a', type: 'smoothstep' },
+  { id: 'e22b', source: '2', target: '2b', type: 'smoothstep' },
+  { id: 'e22c', source: '2', target: '2c', type: 'smoothstep' },
+  { id: 'e2c2d', source: '2c', target: '2d', type: 'smoothstep' },
+
+  { id: 'e45', source: '4', target: '5', type: 'smoothstep' },
+  { id: 'e56', source: '5', target: '6', type: 'smoothstep' },
+  { id: 'e57', source: '5', target: '7', type: 'smoothstep' },
+];
+
+const nodesAndEdges = { nodes, edges };
+
+export default nodesAndEdges;

example/src/Layouting/layouting.css

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+.layoutflow {
+  flex-grow: 1;
+  position: relative;
+}
+
+.layoutflow .controls {
+  position: absolute;
+  right: 10px;
+  top: 10px;
+  z-index: 10;
+}