Merge pull request #2626 from wbkd/feat/resize-node

Feat: Add NodeResizer package

.changeset/nasty-suns-hear.md

@@ -0,0 +1,5 @@
+---
+'@reactflow/node-toolbar': patch
+---
+
+Get nodeId from React Flow context if it is not passed explicitly as prop

.changeset/smooth-swans-exist.md

@@ -0,0 +1,5 @@
+---
+'@reactflow/core': patch
+---
+
+Export the useNodeId hook, refactor how changes are applied and create a helper function

.changeset/twelve-icons-tan.md

@@ -0,0 +1,5 @@
+---
+'@reactflow/node-resizer': major
+---
+
+Add a node resizer component that can be used to resize a custom node

examples/vite-app/package.json

@@ -13,6 +13,7 @@
     "test-e2e": "start-server-and-test 'pnpm serve' http-get://localhost:3000 'pnpm test-e2e-cypress'"
   },
   "dependencies": {
+    "@reactflow/node-resizer": "workspace:^0.0.0",
     "classcat": "^5.0.3",
     "dagre": "^0.8.5",
     "localforage": "^1.10.0",

examples/vite-app/src/App/index.tsx

@@ -20,6 +20,7 @@ import Intersection from '../examples/Intersection';
 import Layouting from '../examples/Layouting';
 import MultiFlows from '../examples/MultiFlows';
 import NestedNodes from '../examples/NestedNodes';
+import NodeResizer from '../examples/NodeResizer';
 import NodeTypeChange from '../examples/NodeTypeChange';
 import NodeTypesObjectChange from '../examples/NodeTypesObjectChange';
 import Overview from '../examples/Overview';
@@ -174,6 +175,11 @@ const routes: IRoute[] = [
     path: '/node-toolbar',
     component: NodeToolbar,
   },
+  {
+    name: 'NodeResizer',
+    path: '/node-resizer',
+    component: NodeResizer,
+  },
   {
     name: 'Overview',
     path: '/overview',

examples/vite-app/src/examples/Basic/index.tsx

@@ -94,7 +94,7 @@ const BasicFlow = () => {
       fitView
       defaultEdgeOptions={defaultEdgeOptions}
       selectNodesOnDrag={false}
-      nodeOrigin={nodeOrigin}
+      // nodeOrigin={nodeOrigin}
     >
       <Background variant={BackgroundVariant.Dots} />
       <MiniMap />

examples/vite-app/src/examples/NodeResizer/CustomResizer.tsx

@@ -0,0 +1,27 @@
+import { memo, FC, CSSProperties } from 'react';
+import { Handle, Position, NodeProps } from 'reactflow';
+
+import { NodeResizer, NodeResizeControl } from '@reactflow/node-resizer';
+import '@reactflow/node-resizer/dist/style.css';
+import ResizeIcon from './ResizeIcon';
+
+const controlStyle = {
+  background: 'transparent',
+  border: 'none',
+};
+
+const CustomNode: FC<NodeProps> = ({ id, data }) => {
+  return (
+    <>
+      <NodeResizeControl style={controlStyle}>
+        <ResizeIcon />
+      </NodeResizeControl>
+
+      <Handle type="target" position={Position.Left} />
+      <div>{data.label}</div>
+      <Handle type="source" position={Position.Right} />
+    </>
+  );
+};
+
+export default memo(CustomNode);

examples/vite-app/src/examples/NodeResizer/CustomResizer2.tsx

@@ -0,0 +1,19 @@
+import { memo, FC } from 'react';
+import { Handle, Position, NodeProps } from 'reactflow';
+
+import { NodeResizer, NodeResizeControl } from '@reactflow/node-resizer';
+import '@reactflow/node-resizer/dist/style.css';
+
+const CustomNode: FC<NodeProps> = ({ id, data }) => {
+  return (
+    <>
+      <NodeResizeControl color="red" position="top" />
+      <NodeResizeControl color="red" position="bottom" />
+      <Handle type="target" position={Position.Left} />
+      <div style={{ padding: 10 }}>{data.label}</div>
+      <Handle type="source" position={Position.Right} />
+    </>
+  );
+};
+
+export default memo(CustomNode);

examples/vite-app/src/examples/NodeResizer/NodeResizerNode.tsx

@@ -0,0 +1,18 @@
+import { memo, FC } from 'react';
+import { Handle, Position, NodeProps } from 'reactflow';
+
+import { NodeResizer } from '@reactflow/node-resizer';
+import '@reactflow/node-resizer/dist/style.css';
+
+const CustomNode: FC<NodeProps> = ({ id, data, selected }) => {
+  return (
+    <>
+      <NodeResizer isVisible={selected} />
+      <Handle type="target" position={Position.Left} />
+      <div>{data.label}</div>
+      <Handle type="source" position={Position.Right} />
+    </>
+  );
+};
+
+export default memo(CustomNode);

examples/vite-app/src/examples/NodeResizer/ResizeIcon.tsx

@@ -0,0 +1,24 @@
+function ResizeIcon() {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="8"
+      height="8"
+      viewBox="0 0 24 24"
+      strokeWidth="2"
+      stroke="currentColor"
+      fill="none"
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      style={{ position: 'absolute', right: 2, bottom: 2 }}
+    >
+      <path stroke="none" d="M0 0h24v24H0z" fill="none" />
+      <polyline points="16 20 20 20 20 16" />
+      <line x1="14" y1="14" x2="20" y2="20" />
+      <polyline points="8 4 4 4 4 8" />
+      <line x1="4" y1="4" x2="10" y2="10" />
+    </svg>
+  );
+}
+
+export default ResizeIcon;

examples/vite-app/src/examples/NodeResizer/index.tsx

@@ -0,0 +1,97 @@
+import { CSSProperties, useCallback, useState } from 'react';
+import ReactFlow, { Controls, addEdge, Position, Connection, useNodesState, useEdgesState, Panel } from 'reactflow';
+
+import NodeResizerNode from './NodeResizerNode';
+import CustomResizer from './CustomResizer';
+import CustomResizer2 from './CustomResizer2';
+
+const nodeTypes = {
+  resizer: NodeResizerNode,
+  customResizer: CustomResizer,
+  customResizer2: CustomResizer2,
+};
+
+const initialEdges = [
+  {
+    id: 'e1-2',
+    source: '1',
+    target: '2',
+  },
+];
+
+const initialNodes = [
+  {
+    id: '1',
+    type: 'input',
+    data: { label: 'An input node' },
+    position: { x: 0, y: 0 },
+    sourcePosition: Position.Right,
+  },
+  {
+    id: '2',
+    type: 'resizer',
+    data: { label: 'default resizer' },
+    position: { x: 250, y: 0 },
+    style: {
+      width: 200,
+      height: 150,
+      border: '1px solid #222',
+      fontSize: 10,
+    },
+  },
+  {
+    id: '3',
+    type: 'customResizer',
+    data: { label: 'resize control with child component' },
+    position: { x: 250, y: 150 },
+    style: { border: '1px solid #222', fontSize: 10, width: 100 },
+    parentNode: '2',
+  },
+  {
+    id: '4',
+    type: 'customResizer2',
+    data: { label: 'resize controls' },
+    position: { x: 100, y: 150 },
+    style: { border: '1px solid #222', fontSize: 10 },
+    parentNode: '2',
+  },
+  {
+    id: '5',
+    type: 'customResizer2',
+    data: { label: 'min width and height' },
+    position: { x: 100, y: 150 },
+    style: { border: '1px solid #222', fontSize: 10 },
+  },
+];
+
+const CustomNodeFlow = () => {
+  const [snapToGrid, setSnapToGrid] = useState(false);
+  const [nodes, setNodes, onNodesChange] = useNodesState(initialNodes);
+  const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
+
+  const onConnect = useCallback(
+    (connection: Connection) => setEdges((eds) => addEdge({ ...connection }, eds)),
+    [setEdges]
+  );
+
+  return (
+    <ReactFlow
+      nodes={nodes}
+      edges={edges}
+      onNodesChange={onNodesChange}
+      onEdgesChange={onEdgesChange}
+      onConnect={onConnect}
+      nodeTypes={nodeTypes}
+      minZoom={-5}
+      maxZoom={5}
+      snapToGrid={snapToGrid}
+    >
+      <Controls />
+      <Panel position="bottom-right">
+        <button onClick={() => setSnapToGrid(!snapToGrid)}>snapToGrid: {snapToGrid ? 'on' : 'off'}</button>
+      </Panel>
+    </ReactFlow>
+  );
+};
+
+export default CustomNodeFlow;

examples/vite-app/src/examples/NodeToolbar/CustomNode.tsx

@@ -4,7 +4,7 @@ import { Handle, Position, NodeProps, NodeToolbar } from 'reactflow';
 const CustomNode: FC<NodeProps> = ({ id, data }) => {
   return (
     <>
-      <NodeToolbar nodeId={id} isVisible={data.toolbarVisible} position={data.toolbarPosition}>
+      <NodeToolbar isVisible={data.toolbarVisible} position={data.toolbarPosition}>
         <button>delete</button>
         <button>copy</button>
         <button>expand</button>

packages/core/src/components/Handle/index.tsx

@@ -1,9 +1,9 @@
-import { memo, useContext, HTMLAttributes, forwardRef, MouseEvent as ReactMouseEvent } from 'react';
+import { memo, HTMLAttributes, forwardRef, MouseEvent as ReactMouseEvent } from 'react';
 import cc from 'classcat';
 import shallow from 'zustand/shallow';
 
 import { useStore, useStoreApi } from '../../hooks/useStore';
-import NodeIdContext from '../../contexts/NodeIdContext';
+import { useNodeId } from '../../contexts/NodeIdContext';
 import { checkElementBelowIsValid, handleMouseDown } from './handler';
 import { getHostForElement } from '../../utils';
 import { addEdge } from '../../utils/graph';
@@ -37,7 +37,9 @@ const Handle = forwardRef<HTMLDivElement, HandleComponentProps>(
     ref
   ) => {
     const store = useStoreApi();
-    const nodeId = useContext(NodeIdContext) as string;
+
+    // @fixme: remove type assertion and handle nodeId === null
+    const nodeId = useNodeId() as string;
     const { connectionStartHandle, connectOnClick, noPanClassName } = useStore(selector, shallow);
 
     const handleId = id || null;

packages/core/src/container/NodeRenderer/index.tsx

@@ -57,6 +57,7 @@ const NodeRenderer = (props: NodeRendererProps) => {
         nodeElement: entry.target as HTMLDivElement,
         forceUpdate: true,
       }));
+
       updateNodeDimensions(updates);
     });
 

packages/core/src/contexts/NodeIdContext.ts

@@ -1,7 +1,12 @@
-import { createContext } from 'react';
+import { createContext, useContext } from 'react';
 
 export const NodeIdContext = createContext<string | null>(null);
 export const Provider = NodeIdContext.Provider;
 export const Consumer = NodeIdContext.Consumer;
 
+export const useNodeId = (): string | null => {
+  const nodeId = useContext(NodeIdContext);
+  return nodeId;
+};
+
 export default NodeIdContext;

packages/core/src/hooks/useDrag/index.ts

@@ -1,15 +1,14 @@
-import { useEffect, useRef, useState, useCallback } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import type { RefObject, MouseEvent } from 'react';
 import { drag } from 'd3-drag';
 import { select } from 'd3-selection';
-import type { D3DragEvent, SubjectPosition } from 'd3';
 
 import { useStoreApi } from '../../hooks/useStore';
 import { getDragItems, getEventHandlerParams, hasSelector, calcNextPosition } from './utils';
 import { handleNodeClick } from '../../components/Nodes/utils';
-import type { NodeDragItem, Node, SelectionDragHandler } from '../../types';
+import useGetPointerPosition from '../useGetPointerPosition';
+import type { NodeDragItem, Node, SelectionDragHandler, UseDragEvent } from '../../types';
 
-export type UseDragEvent = D3DragEvent<HTMLDivElement, null, SubjectPosition>;
 export type UseDragData = { dx: number; dy: number };
 
 type UseDragParams = {
@@ -40,24 +39,7 @@ function useDrag({
   const dragItems = useRef<NodeDragItem[]>();
   const lastPos = useRef<{ x: number | null; y: number | null }>({ x: null, y: null });
 
-  // returns the pointer position projected to the RF coordinate system
-  const getPointerPosition = useCallback(({ sourceEvent }: UseDragEvent) => {
-    const { transform, snapGrid, snapToGrid } = store.getState();
-    const x = sourceEvent.touches ? sourceEvent.touches[0].clientX : sourceEvent.clientX;
-    const y = sourceEvent.touches ? sourceEvent.touches[0].clientY : sourceEvent.clientY;
-
-    const pointerPos = {
-      x: (x - transform[0]) / transform[2],
-      y: (y - transform[1]) / transform[2],
-    };
-
-    // we need the snapped position in order to be able to skip unnecessary drag events
-    return {
-      xSnapped: snapToGrid ? snapGrid[0] * Math.round(pointerPos.x / snapGrid[0]) : pointerPos.x,
-      ySnapped: snapToGrid ? snapGrid[1] * Math.round(pointerPos.y / snapGrid[1]) : pointerPos.y,
-      ...pointerPos,
-    };
-  }, []);
+  const getPointerPosition = useGetPointerPosition();
 
   useEffect(() => {
     if (nodeRef?.current) {

packages/core/src/hooks/useGetPointerPosition.ts

@@ -0,0 +1,31 @@
+import { useCallback } from 'react';
+
+import { useStoreApi } from './useStore';
+import type { UseDragEvent } from '../types';
+
+function useGetPointerPosition() {
+  const store = useStoreApi();
+
+  // returns the pointer position projected to the RF coordinate system
+  const getPointerPosition = useCallback(({ sourceEvent }: UseDragEvent) => {
+    const { transform, snapGrid, snapToGrid } = store.getState();
+    const x = sourceEvent.touches ? sourceEvent.touches[0].clientX : sourceEvent.clientX;
+    const y = sourceEvent.touches ? sourceEvent.touches[0].clientY : sourceEvent.clientY;
+
+    const pointerPos = {
+      x: (x - transform[0]) / transform[2],
+      y: (y - transform[1]) / transform[2],
+    };
+
+    // we need the snapped position in order to be able to skip unnecessary drag events
+    return {
+      xSnapped: snapToGrid ? snapGrid[0] * Math.round(pointerPos.x / snapGrid[0]) : pointerPos.x,
+      ySnapped: snapToGrid ? snapGrid[1] * Math.round(pointerPos.y / snapGrid[1]) : pointerPos.y,
+      ...pointerPos,
+    };
+  }, []);
+
+  return getPointerPosition;
+}
+
+export default useGetPointerPosition;

packages/core/src/index.ts

@@ -38,5 +38,7 @@ export { useStore, useStoreApi } from './hooks/useStore';
 export { default as useOnViewportChange } from './hooks/useOnViewportChange';
 export { default as useOnSelectionChange } from './hooks/useOnSelectionChange';
 export { default as useNodesInitialized } from './hooks/useNodesInitialized';
+export { default as useGetPointerPosition } from './hooks/useGetPointerPosition';
+export { useNodeId } from './contexts/NodeIdContext';
 
 export * from './types';

packages/core/src/store/index.ts

@@ -17,6 +17,7 @@ import type {
   NodePositionChange,
   NodeDragItem,
   UnselectNodesAndEdgesParams,
+  NodeChange,
 } from '../types';
 
 const createRFStore = () =>
@@ -103,35 +104,40 @@ const createRFStore = () =>
       }
     },
     updateNodePositions: (nodeDragItems: NodeDragItem[] | Node[], positionChanged = true, dragging = false) => {
+      const { triggerNodeChanges } = get();
+
+      const changes = nodeDragItems.map((node) => {
+        const change: NodePositionChange = {
+          id: node.id,
+          type: 'position',
+          dragging,
+        };
+
+        if (positionChanged) {
+          change.positionAbsolute = node.positionAbsolute;
+          change.position = node.position;
+        }
+
+        return change;
+      });
+
+      triggerNodeChanges(changes);
+    },
+
+    triggerNodeChanges: (changes: NodeChange[]) => {
       const { onNodesChange, nodeInternals, hasDefaultNodes, nodeOrigin } = get();
 
-      if (hasDefaultNodes || onNodesChange) {
-        const changes = nodeDragItems.map((node) => {
-          const change: NodePositionChange = {
-            id: node.id,
-            type: 'position',
-            dragging,
-          };
-
-          if (positionChanged) {
-            change.positionAbsolute = node.positionAbsolute;
-            change.position = node.position;
-          }
-
-          return change;
-        });
-
-        if (changes?.length) {
-          if (hasDefaultNodes) {
-            const nodes = applyNodeChanges(changes, Array.from(nodeInternals.values()));
-            const nextNodeInternals = createNodeInternals(nodes, nodeInternals, nodeOrigin);
-            set({ nodeInternals: nextNodeInternals });
-          }
-
-          onNodesChange?.(changes);
+      if (changes?.length) {
+        if (hasDefaultNodes) {
+          const nodes = applyNodeChanges(changes, Array.from(nodeInternals.values()));
+          const nextNodeInternals = createNodeInternals(nodes, nodeInternals, nodeOrigin);
+          set({ nodeInternals: nextNodeInternals });
         }
+
+        onNodesChange?.(changes);
       }
     },
+
     addSelectedNodes: (selectedNodeIds: string[]) => {
       const { multiSelectionActive, nodeInternals, edges } = get();
       let changedNodes: NodeSelectionChange[];

packages/core/src/types/changes.ts

@@ -7,7 +7,9 @@ import type { Edge } from './edges';
 export type NodeDimensionChange = {
   id: string;
   type: 'dimensions';
-  dimensions: Dimensions;
+  dimensions?: Dimensions;
+  updateStyle?: boolean;
+  resizing?: boolean;
 };
 
 export type NodePositionChange = {

packages/core/src/types/general.ts

@@ -1,9 +1,9 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 import type { MouseEvent as ReactMouseEvent, ComponentType, MemoExoticComponent } from 'react';
-import type { Selection as D3Selection, ZoomBehavior } from 'd3';
+import type { D3DragEvent, Selection as D3Selection, SubjectPosition, ZoomBehavior } from 'd3';
 
 import type { XYPosition, Rect, Transform, CoordinateExtent } from './utils';
-import type { NodeChange, EdgeChange } from './changes';
+import type { NodeChange, EdgeChange, NodePositionChange } from './changes';
 import type {
   Node,
   NodeInternals,
@@ -226,6 +226,7 @@ export type ReactFlowActions = {
   setNodeExtent: (nodeExtent: CoordinateExtent) => void;
   cancelConnection: () => void;
   reset: () => void;
+  triggerNodeChanges: (changes: NodeChange[]) => void;
 };
 
 export type ReactFlowState = ReactFlowStore & ReactFlowActions;
@@ -245,3 +246,5 @@ export type ProOptions = {
   account?: string;
   hideAttribution: boolean;
 };
+
+export type UseDragEvent = D3DragEvent<HTMLDivElement, null, SubjectPosition>;

packages/core/src/types/nodes.ts

@@ -31,6 +31,7 @@ export type Node<T = any> = {
   positionAbsolute?: XYPosition;
   ariaLabel?: string;
   focusable?: boolean;
+  resizing?: boolean;
 
   // only used internally
   [internalsSymbol]?: {

packages/core/src/utils/changes.ts

@@ -50,58 +50,67 @@ function applyChanges(changes: any[], elements: any[]): any[] {
   const initElements: any[] = changes.filter((c) => c.type === 'add').map((c) => c.item);
 
   return elements.reduce((res: any[], item: any) => {
-    const currentChange = changes.find((c) => c.id === item.id);
+    const currentChanges = changes.filter((c) => c.id === item.id);
 
-    if (currentChange) {
-      switch (currentChange.type) {
-        case 'select': {
-          res.push({ ...item, selected: currentChange.selected });
-          return res;
-        }
-        case 'position': {
-          const updateItem = { ...item };
+    if (currentChanges.length === 0) {
+      res.push(item);
+      return res;
+    }
 
-          if (typeof currentChange.position !== 'undefined') {
-            updateItem.position = currentChange.position;
+    const updateItem = { ...item };
+
+    for (const currentChange of currentChanges) {
+      if (currentChange) {
+        switch (currentChange.type) {
+          case 'select': {
+            updateItem.selected = currentChange.selected;
+            break;
           }
+          case 'position': {
+            if (typeof currentChange.position !== 'undefined') {
+              updateItem.position = currentChange.position;
+            }
 
-          if (typeof currentChange.positionAbsolute !== 'undefined') {
-            updateItem.positionAbsolute = currentChange.positionAbsolute;
+            if (typeof currentChange.positionAbsolute !== 'undefined') {
+              updateItem.positionAbsolute = currentChange.positionAbsolute;
+            }
+
+            if (typeof currentChange.dragging !== 'undefined') {
+              updateItem.dragging = currentChange.dragging;
+            }
+
+            if (updateItem.expandParent) {
+              handleParentExpand(res, updateItem);
+            }
+            break;
           }
+          case 'dimensions': {
+            if (typeof currentChange.dimensions !== 'undefined') {
+              updateItem.width = currentChange.dimensions.width;
+              updateItem.height = currentChange.dimensions.height;
+            }
 
-          if (typeof currentChange.dragging !== 'undefined') {
-            updateItem.dragging = currentChange.dragging;
+            if (typeof currentChange.updateStyle !== 'undefined') {
+              updateItem.style = { ...(updateItem.style || {}), ...currentChange.dimensions };
+            }
+
+            if (typeof currentChange.resizing === 'boolean') {
+              updateItem.resizing = currentChange.resizing;
+            }
+
+            if (updateItem.expandParent) {
+              handleParentExpand(res, updateItem);
+            }
+            break;
           }
-
-          if (updateItem.expandParent) {
-            handleParentExpand(res, updateItem);
+          case 'remove': {
+            return res;
           }
-
-          res.push(updateItem);
-          return res;
-        }
-        case 'dimensions': {
-          const updateItem = { ...item };
-
-          if (typeof currentChange.dimensions !== 'undefined') {
-            updateItem.width = currentChange.dimensions.width;
-            updateItem.height = currentChange.dimensions.height;
-          }
-
-          if (updateItem.expandParent) {
-            handleParentExpand(res, updateItem);
-          }
-
-          res.push(updateItem);
-          return res;
-        }
-        case 'remove': {
-          return res;
         }
       }
     }
 
-    res.push(item);
+    res.push(updateItem);
     return res;
   }, initElements);
 }

packages/node-resizer/.eslintrc.js

@@ -0,0 +1,4 @@
+module.exports = {
+  root: true,
+  extends: ['@reactflow/eslint-config'],
+};

packages/node-resizer/CHANGELOG.md

@@ -0,0 +1 @@
+# @reactflow/node-resizer

packages/node-resizer/README.md

@@ -0,0 +1,10 @@
+# @reactflow/node-resizer
+
+A resizer component for React Flow that can be attached to a node.
+
+## Installation 
+
+```sh 
+npm install @reactflow/node-resizer
+```
+

packages/node-resizer/package.json

@@ -0,0 +1,71 @@
+{
+  "name": "@reactflow/node-resizer",
+  "version": "0.0.0",
+  "description": "A helper component for resizing nodes.",
+  "keywords": [
+    "react",
+    "node-based UI",
+    "graph",
+    "diagram",
+    "workflow",
+    "react-flow"
+  ],
+  "files": [
+    "dist"
+  ],
+  "source": "src/index.tsx",
+  "main": "dist/umd/index.js",
+  "module": "dist/esm/index.js",
+  "types": "dist/esm/index.d.ts",
+  "sideEffects": [
+    "*.css"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/wbkd/react-flow.git",
+    "directory": "packages/node-resizer"
+  },
+  "scripts": {
+    "dev": "concurrently \"rollup --config node:@reactflow/rollup-config --watch\" pnpm:css-watch",
+    "build": "rollup --config node:@reactflow/rollup-config --environment NODE_ENV:production && npm run css",
+    "css": "postcss src/*.css --config ../../tooling/postcss-config/postcss.config.js --dir dist",
+    "css-watch": "pnpm css --watch",
+    "lint": "eslint --ext .js,.jsx,.ts,.tsx src",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@reactflow/core": "workspace:*",
+    "classcat": "^5.0.4",
+    "d3-drag": "^3.0.0",
+    "d3-selection": "^3.0.0",
+    "zustand": "^4.1.1"
+  },
+  "peerDependencies": {
+    "react": ">=17",
+    "react-dom": ">=17"
+  },
+  "devDependencies": {
+    "@reactflow/eslint-config": "workspace:*",
+    "@reactflow/rollup-config": "workspace:*",
+    "@reactflow/tsconfig": "workspace:*",
+    "@types/d3-drag": "^3.0.1",
+    "@types/d3-selection": "^3.0.3",
+    "@types/node": "^18.7.16",
+    "@types/react": "^18.0.19",
+    "@types/react-dom": "^18.0.6",
+    "react": "^18.2.0",
+    "typescript": "^4.8.3"
+  },
+  "rollup": {
+    "globals": {
+      "zustand": "Zustand",
+      "zustand/shallow": "zustandShallow",
+      "classcat": "cc"
+    },
+    "name": "ReactFlowNodeResizer"
+  }
+}

packages/node-resizer/src/NodeResizer.tsx

@@ -0,0 +1,45 @@
+import ResizeControl from './ResizeControl';
+import { ControlPosition, NodeResizerProps, ResizeControlVariant, ControlLinePosition } from './types';
+
+const handleControls: ControlPosition[] = ['top-left', 'top-right', 'bottom-left', 'bottom-right'];
+const lineControls: ControlLinePosition[] = ['top', 'right', 'bottom', 'left'];
+
+export default function NodeResizer({
+  nodeId,
+  isVisible = true,
+  handleClassName,
+  handleStyle,
+  lineClassName,
+  lineStyle,
+  color,
+}: NodeResizerProps) {
+  if (!isVisible) {
+    return null;
+  }
+
+  return (
+    <>
+      {lineControls.map((c) => (
+        <ResizeControl
+          key={c}
+          className={lineClassName}
+          style={lineStyle}
+          nodeId={nodeId}
+          position={c}
+          variant={ResizeControlVariant.Line}
+          color={color}
+        />
+      ))}
+      {handleControls.map((c) => (
+        <ResizeControl
+          key={c}
+          className={handleClassName}
+          style={handleStyle}
+          nodeId={nodeId}
+          position={c}
+          color={color}
+        />
+      ))}
+    </>
+  );
+}

packages/node-resizer/src/ResizeControl.tsx

@@ -0,0 +1,183 @@
+import { useRef, useEffect, memo } from 'react';
+import cc from 'classcat';
+import { drag } from 'd3-drag';
+import { select } from 'd3-selection';
+import {
+  useStoreApi,
+  useGetPointerPosition,
+  NodeChange,
+  NodeDimensionChange,
+  useNodeId,
+  NodePositionChange,
+} from '@reactflow/core';
+import type { Dimensions, XYPosition } from '@reactflow/core';
+
+import { ResizeDragEvent, ResizeControlProps, ResizeControlLineProps, ResizeControlVariant } from './types';
+
+function ResizeControl({
+  nodeId,
+  position,
+  variant = ResizeControlVariant.Handle,
+  className,
+  style = {},
+  children,
+  color,
+  minWidth = 1,
+  minHeight = 1,
+}: ResizeControlProps) {
+  const contextNodeId = useNodeId();
+  const id = typeof nodeId === 'string' ? nodeId : contextNodeId;
+  const store = useStoreApi();
+  const resizeControlRef = useRef<HTMLDivElement>(null);
+  const startValues = useRef<Dimensions & XYPosition & { nodeX: number; nodeY: number }>({
+    width: 0,
+    height: 0,
+    x: 0,
+    y: 0,
+    nodeX: 0,
+    nodeY: 0,
+  });
+  const prevValues = useRef<Dimensions & XYPosition>({ width: 0, height: 0, x: 0, y: 0 });
+  const getPointerPosition = useGetPointerPosition();
+  const defaultPosition = variant === ResizeControlVariant.Line ? 'right' : 'bottom-right';
+  const controlPosition = position ?? defaultPosition;
+
+  useEffect(() => {
+    if (!resizeControlRef.current || !id) {
+      return;
+    }
+
+    const selection = select(resizeControlRef.current);
+    const dragHandler = drag<HTMLDivElement, unknown>()
+      .on('start', (event: ResizeDragEvent) => {
+        const node = store.getState().nodeInternals.get(id);
+        const { xSnapped, ySnapped } = getPointerPosition(event);
+
+        startValues.current = {
+          width: node?.width ?? 0,
+          height: node?.height ?? 0,
+          nodeX: node?.position.x ?? 0,
+          nodeY: node?.position.y ?? 0,
+          x: xSnapped,
+          y: ySnapped,
+        };
+
+        prevValues.current = {
+          width: node?.width ?? 0,
+          height: node?.height ?? 0,
+          x: node?.position.x ?? 0,
+          y: node?.position.y ?? 0,
+        };
+      })
+      .on('drag', (event: ResizeDragEvent) => {
+        const { nodeInternals, triggerNodeChanges } = store.getState();
+        const { xSnapped, ySnapped } = getPointerPosition(event);
+        const node = nodeInternals.get(id);
+        const enableX = controlPosition.includes('right') || controlPosition.includes('left');
+        const enableY = controlPosition.includes('bottom') || controlPosition.includes('top');
+        const invertX = controlPosition.includes('left');
+        const invertY = controlPosition.includes('top');
+
+        if (node) {
+          const changes: NodeChange[] = [];
+          const {
+            x: startX,
+            y: startY,
+            width: startWidth,
+            height: startHeight,
+            nodeX: startNodeX,
+            nodeY: startNodeY,
+          } = startValues.current;
+
+          const { x: prevX, y: prevY, width: prevWidth, height: prevHeight } = prevValues.current;
+
+          const distX = Math.floor(enableX ? xSnapped - startX : 0);
+          const distY = Math.floor(enableY ? ySnapped - startY : 0);
+          const width = Math.max(startWidth + (invertX ? -distX : distX), minWidth);
+          const height = Math.max(startHeight + (invertY ? -distY : distY), minHeight);
+
+          const isWidthChange = width !== prevWidth;
+          const isHeightChange = height !== prevHeight;
+
+          if (invertX || invertY) {
+            const x = invertX ? startNodeX - (width - startWidth) : startNodeX;
+            const y = invertY ? startNodeY - (height - startHeight) : startNodeY;
+
+            // only transform the node if the width or height changes
+            const isXPosChange = x !== prevX && isWidthChange;
+            const isYPosChange = y !== prevY && isHeightChange;
+
+            if (isXPosChange || isYPosChange) {
+              const positionChange: NodePositionChange = {
+                id: node.id,
+                type: 'position',
+                position: {
+                  x: isXPosChange ? x : prevX,
+                  y: isYPosChange ? y : prevY,
+                },
+              };
+
+              changes.push(positionChange);
+              prevValues.current.x = positionChange.position!.x;
+              prevValues.current.y = positionChange.position!.y;
+            }
+          }
+
+          if (isWidthChange || isHeightChange) {
+            const dimensionChange: NodeDimensionChange = {
+              id: id,
+              type: 'dimensions',
+              updateStyle: true,
+              resizing: true,
+              dimensions: {
+                width: width,
+                height: height,
+              },
+            };
+            changes.push(dimensionChange);
+            prevValues.current.width = width;
+            prevValues.current.height = height;
+          }
+
+          triggerNodeChanges(changes);
+        }
+      })
+      .on('end', () => {
+        const { triggerNodeChanges } = store.getState();
+
+        const dimensionChange: NodeDimensionChange = {
+          id: id,
+          type: 'dimensions',
+          resizing: true,
+        };
+
+        triggerNodeChanges([dimensionChange]);
+      });
+
+    selection.call(dragHandler);
+
+    return () => {
+      selection.on('.drag', null);
+    };
+  }, [id, controlPosition, getPointerPosition]);
+
+  const positionClassNames = controlPosition.split('-');
+  const colorStyleProp = variant === ResizeControlVariant.Line ? 'borderColor' : 'backgroundColor';
+  const controlStyle = color ? { ...style, [colorStyleProp]: color } : style;
+
+  return (
+    <div
+      className={cc(['react-flow__resize-control', 'nodrag', ...positionClassNames, variant, className])}
+      ref={resizeControlRef}
+      style={controlStyle}
+    >
+      {children}
+    </div>
+  );
+}
+
+export function ResizeControlLine(props: ResizeControlLineProps) {
+  return <ResizeControl {...props} variant={ResizeControlVariant.Line} />;
+}
+
+export default memo(ResizeControl);

packages/node-resizer/src/index.tsx

@@ -0,0 +1,4 @@
+export { default as NodeResizer } from './NodeResizer';
+export { default as NodeResizeControl } from './ResizeControl';
+
+export * from './types';

packages/node-resizer/src/style.css

@@ -0,0 +1,103 @@
+.react-flow__resize-control {
+  position: absolute;
+}
+
+.react-flow__resize-control.left,
+.react-flow__resize-control.right {
+  cursor: ew-resize;
+}
+
+.react-flow__resize-control.top,
+.react-flow__resize-control.bottom {
+  cursor: ns-resize;
+}
+
+.react-flow__resize-control.top.left,
+.react-flow__resize-control.bottom.right {
+  cursor: nwse-resize;
+}
+
+.react-flow__resize-control.bottom.left,
+.react-flow__resize-control.top.right {
+  cursor: nesw-resize;
+}
+
+/* handle styles */
+.react-flow__resize-control.handle {
+  width: 4px;
+  height: 4px;
+  border: 1px solid #fff;
+  border-radius: 1px;
+  background-color: #3367d9;
+  transform: translate(-50%, -50%);
+}
+
+.react-flow__resize-control.handle.left {
+  left: 0;
+  top: 50%;
+}
+.react-flow__resize-control.handle.right {
+  left: 100%;
+  top: 50%;
+}
+.react-flow__resize-control.handle.top {
+  left: 50%;
+  top: 0;
+}
+.react-flow__resize-control.handle.bottom {
+  left: 50%;
+  top: 100%;
+}
+.react-flow__resize-control.handle.top.left {
+  left: 0;
+}
+.react-flow__resize-control.handle.bottom.left {
+  left: 0;
+}
+.react-flow__resize-control.handle.top.right {
+  left: 100%;
+}
+.react-flow__resize-control.handle.bottom.right {
+  left: 100%;
+}
+
+/* line styles */
+.react-flow__resize-control.line {
+  border-color: #3367d9;
+  border-width: 0;
+  border-style: solid;
+}
+
+.react-flow__resize-control.line.left,
+.react-flow__resize-control.line.right {
+  width: 1px;
+  transform: translate(-50%, 0);
+  top: 0;
+  height: 100%;
+}
+
+.react-flow__resize-control.line.left {
+  left: 0;
+  border-left-width: 1px;
+}
+.react-flow__resize-control.line.right {
+  left: 100%;
+  border-right-width: 1px;
+}
+
+.react-flow__resize-control.line.top,
+.react-flow__resize-control.line.bottom {
+  height: 1px;
+  transform: translate(0, -50%);
+  left: 0;
+  width: 100%;
+}
+
+.react-flow__resize-control.line.top {
+  top: 0;
+  border-top-width: 1px;
+}
+.react-flow__resize-control.line.bottom {
+  border-bottom-width: 1px;
+  top: 100%;
+}

packages/node-resizer/src/types.ts

@@ -0,0 +1,39 @@
+import type { CSSProperties, ReactNode } from 'react';
+import type { D3DragEvent, SubjectPosition } from 'd3-drag';
+
+export type NodeResizerProps = {
+  nodeId?: string;
+  color?: string;
+  handleClassName?: string;
+  handleStyle?: CSSProperties;
+  lineClassName?: string;
+  lineStyle?: CSSProperties;
+  isVisible?: boolean;
+};
+
+export type ControlLinePosition = 'top' | 'bottom' | 'left' | 'right';
+
+export type ControlPosition = ControlLinePosition | 'top-left' | 'top-right' | 'bottom-left' | 'bottom-right';
+
+export enum ResizeControlVariant {
+  Line = 'line',
+  Handle = 'handle',
+}
+
+export type ResizeControlProps = {
+  nodeId?: string;
+  position?: ControlPosition;
+  variant?: ResizeControlVariant;
+  color?: string;
+  className?: string;
+  style?: CSSProperties;
+  children?: ReactNode;
+  minWidth?: number;
+  minHeight?: number;
+};
+
+export type ResizeControlLineProps = ResizeControlProps & {
+  position: ControlLinePosition;
+};
+
+export type ResizeDragEvent = D3DragEvent<HTMLDivElement, null, SubjectPosition>;

packages/node-resizer/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "extends": "@reactflow/tsconfig/react.json",
+  "display": "@reactflow/node-resizer",
+  "include": ["**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules", "dist"]
+}

packages/node-toolbar/src/NodeToolbar.tsx

@@ -8,6 +8,7 @@ import {
   Rect,
   Position,
   internalsSymbol,
+  useNodeId,
 } from '@reactflow/core';
 import cc from 'classcat';
 import shallow from 'zustand/shallow';
@@ -72,9 +73,11 @@ function NodeToolbar({
   offset = 10,
   ...rest
 }: NodeToolbarProps) {
+  const contextNodeId = useNodeId();
+
   const nodesSelector = useCallback(
     (state: ReactFlowState): Node[] => {
-      const nodeIds: string[] = typeof nodeId === 'string' ? [nodeId] : nodeId;
+      const nodeIds = Array.isArray(nodeId) ? nodeId : [nodeId || contextNodeId || ''];
 
       return nodeIds.reduce<Node[]>((acc, id) => {
         const node = state.nodeInternals.get(id);
@@ -84,7 +87,7 @@ function NodeToolbar({
         return acc;
       }, [] as Node[]);
     },
-    [nodeId]
+    [nodeId, contextNodeId]
   );
   const nodes = useStore(nodesSelector, nodesEqualityFn);
   const { transform, nodeOrigin, selectedNodesCount } = useStore(storeSelector, shallow);

packages/node-toolbar/src/types.ts

@@ -2,7 +2,7 @@ import { Position } from '@reactflow/core';
 import type { HTMLAttributes } from 'react';
 
 export type NodeToolbarProps = HTMLAttributes<HTMLDivElement> & {
-  nodeId: string | string[];
+  nodeId?: string | string[];
   isVisible?: boolean;
   position?: Position;
   offset?: number;

pnpm-lock.yaml

@@ -57,6 +57,7 @@ importers:
   examples/vite-app:
     specifiers:
       '@cypress/skip-test': ^2.6.1
+      '@reactflow/node-resizer': workspace:^0.0.0
       '@types/react': ^18.0.17
       '@types/react-dom': ^18.0.6
       '@vitejs/plugin-react': ^2.1.0
@@ -73,6 +74,7 @@ importers:
       typescript: ^4.8.3
       vite: ^3.1.0
     dependencies:
+      '@reactflow/node-resizer': link:../../packages/node-resizer
       classcat: registry.npmjs.org/classcat/5.0.4
       dagre: registry.npmjs.org/dagre/0.8.5
       localforage: registry.npmjs.org/localforage/1.10.0
@@ -215,6 +217,45 @@ importers:
       react: registry.npmjs.org/react/18.2.0
       typescript: registry.npmjs.org/typescript/4.8.3
 
+  packages/node-resizer:
+    specifiers:
+      '@babel/runtime': ^7.18.9
+      '@reactflow/core': workspace:*
+      '@reactflow/eslint-config': workspace:*
+      '@reactflow/rollup-config': workspace:*
+      '@reactflow/tsconfig': workspace:*
+      '@types/d3': ^7.4.0
+      '@types/d3-drag': ^3.0.1
+      '@types/d3-selection': ^3.0.3
+      '@types/node': ^18.7.16
+      '@types/react': ^18.0.19
+      '@types/react-dom': ^18.0.6
+      classcat: ^5.0.4
+      d3-drag: ^3.0.0
+      d3-selection: ^3.0.0
+      react: ^18.2.0
+      typescript: ^4.8.3
+      zustand: ^4.1.1
+    dependencies:
+      '@babel/runtime': registry.npmjs.org/@babel/runtime/7.19.0
+      '@reactflow/core': link:../core
+      classcat: registry.npmjs.org/classcat/5.0.4
+      d3-drag: registry.npmjs.org/d3-drag/3.0.0
+      d3-selection: registry.npmjs.org/d3-selection/3.0.0
+      zustand: registry.npmjs.org/zustand/4.1.1_react@18.2.0
+    devDependencies:
+      '@reactflow/eslint-config': link:../../tooling/eslint-config
+      '@reactflow/rollup-config': link:../../tooling/rollup-config
+      '@reactflow/tsconfig': link:../../tooling/tsconfig
+      '@types/d3': registry.npmjs.org/@types/d3/7.4.0
+      '@types/d3-drag': registry.npmjs.org/@types/d3-drag/3.0.1
+      '@types/d3-selection': registry.npmjs.org/@types/d3-selection/3.0.3
+      '@types/node': registry.npmjs.org/@types/node/18.7.16
+      '@types/react': registry.npmjs.org/@types/react/18.0.19
+      '@types/react-dom': registry.npmjs.org/@types/react-dom/18.0.6
+      react: registry.npmjs.org/react/18.2.0
+      typescript: registry.npmjs.org/typescript/4.8.3
+
   packages/node-toolbar:
     specifiers:
       '@babel/runtime': ^7.18.9
@@ -1380,7 +1421,6 @@ packages:
     resolution: {integrity: sha512-Reoy+pKnvsksN0lQUlcH6dOGjRZ/3WRwXR//m+/8lt1BXeI4xyaUZoqULNjyXXRuh0Mj4LNpkCvhUpQlY3X5xQ==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-array/-/d3-array-3.0.3.tgz}
     name: '@types/d3-array'
     version: 3.0.3
-    dev: false
 
   registry.npmjs.org/@types/d3-axis/3.0.1:
     resolution: {integrity: sha512-zji/iIbdd49g9WN0aIsGcwcTBUkgLsCSwB+uH+LPVDAiKWENMtI3cJEWt+7/YYwelMoZmbBfzA3qCdrZ2XFNnw==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-axis/-/d3-axis-3.0.1.tgz}
@@ -1388,7 +1428,6 @@ packages:
     version: 3.0.1
     dependencies:
       '@types/d3-selection': registry.npmjs.org/@types/d3-selection/3.0.3
-    dev: false
 
   registry.npmjs.org/@types/d3-brush/3.0.1:
     resolution: {integrity: sha512-B532DozsiTuQMHu2YChdZU0qsFJSio3Q6jmBYGYNp3gMDzBmuFFgPt9qKA4VYuLZMp4qc6eX7IUFUEsvHiXZAw==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-brush/-/d3-brush-3.0.1.tgz}
@@ -1396,19 +1435,16 @@ packages:
     version: 3.0.1
     dependencies:
       '@types/d3-selection': registry.npmjs.org/@types/d3-selection/3.0.3
-    dev: false
 
   registry.npmjs.org/@types/d3-chord/3.0.1:
     resolution: {integrity: sha512-eQfcxIHrg7V++W8Qxn6QkqBNBokyhdWSAS73AbkbMzvLQmVVBviknoz2SRS/ZJdIOmhcmmdCRE/NFOm28Z1AMw==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-chord/-/d3-chord-3.0.1.tgz}
     name: '@types/d3-chord'
     version: 3.0.1
-    dev: false
 
   registry.npmjs.org/@types/d3-color/3.1.0:
     resolution: {integrity: sha512-HKuicPHJuvPgCD+np6Se9MQvS6OCbJmOjGvylzMJRlDwUXjKTTXs6Pwgk79O09Vj/ho3u1ofXnhFOaEWWPrlwA==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-color/-/d3-color-3.1.0.tgz}
     name: '@types/d3-color'
     version: 3.1.0
-    dev: false
 
   registry.npmjs.org/@types/d3-contour/3.0.1:
     resolution: {integrity: sha512-C3zfBrhHZvrpAAK3YXqLWVAGo87A4SvJ83Q/zVJ8rFWJdKejUnDYaWZPkA8K84kb2vDA/g90LTQAz7etXcgoQQ==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-contour/-/d3-contour-3.0.1.tgz}
@@ -1417,19 +1453,16 @@ packages:
     dependencies:
       '@types/d3-array': registry.npmjs.org/@types/d3-array/3.0.3
       '@types/geojson': registry.npmjs.org/@types/geojson/7946.0.10
-    dev: false
 
   registry.npmjs.org/@types/d3-delaunay/6.0.1:
     resolution: {integrity: sha512-tLxQ2sfT0p6sxdG75c6f/ekqxjyYR0+LwPrsO1mbC9YDBzPJhs2HbJJRrn8Ez1DBoHRo2yx7YEATI+8V1nGMnQ==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-delaunay/-/d3-delaunay-6.0.1.tgz}
     name: '@types/d3-delaunay'
     version: 6.0.1
-    dev: false
 
   registry.npmjs.org/@types/d3-dispatch/3.0.1:
     resolution: {integrity: sha512-NhxMn3bAkqhjoxabVJWKryhnZXXYYVQxaBnbANu0O94+O/nX9qSjrA1P1jbAQJxJf+VC72TxDX/YJcKue5bRqw==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-dispatch/-/d3-dispatch-3.0.1.tgz}
     name: '@types/d3-dispatch'
     version: 3.0.1
-    dev: false
 
   registry.npmjs.org/@types/d3-drag/3.0.1:
     resolution: {integrity: sha512-o1Va7bLwwk6h03+nSM8dpaGEYnoIG19P0lKqlic8Un36ymh9NSkNFX1yiXMKNMx8rJ0Kfnn2eovuFaL6Jvj0zA==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-drag/-/d3-drag-3.0.1.tgz}
@@ -1437,19 +1470,16 @@ packages:
     version: 3.0.1
     dependencies:
       '@types/d3-selection': registry.npmjs.org/@types/d3-selection/3.0.3
-    dev: false
 
   registry.npmjs.org/@types/d3-dsv/3.0.0:
     resolution: {integrity: sha512-o0/7RlMl9p5n6FQDptuJVMxDf/7EDEv2SYEO/CwdG2tr1hTfUVi0Iavkk2ax+VpaQ/1jVhpnj5rq1nj8vwhn2A==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-dsv/-/d3-dsv-3.0.0.tgz}
     name: '@types/d3-dsv'
     version: 3.0.0
-    dev: false
 
   registry.npmjs.org/@types/d3-ease/3.0.0:
     resolution: {integrity: sha512-aMo4eaAOijJjA6uU+GIeW018dvy9+oH5Y2VPPzjjfxevvGQ/oRDs+tfYC9b50Q4BygRR8yE2QCLsrT0WtAVseA==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-ease/-/d3-ease-3.0.0.tgz}
     name: '@types/d3-ease'
     version: 3.0.0
-    dev: false
 
   registry.npmjs.org/@types/d3-fetch/3.0.1:
     resolution: {integrity: sha512-toZJNOwrOIqz7Oh6Q7l2zkaNfXkfR7mFSJvGvlD/Ciq/+SQ39d5gynHJZ/0fjt83ec3WL7+u3ssqIijQtBISsw==, registry: https://registry.npmjs.com/, tarball: https://registry.npmjs.org/@types/d3-fetch/-/d3-fetch-3.0.1.tgz}
@@ -1457,19 +1487,16 @@ packages:
     version: 3.0.1
     dependencies:
       '@types/d3-dsv': registry.npmjs.org/@types/d3-dsv/3.0.0
-    dev: false
 
   registry.npmjs.org/@types/d3-force/3.0.3:
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