feat(connections): support touch

packages/core/src/components/Edges/wrapEdge.tsx

@@ -4,7 +4,7 @@ import cc from 'classcat';
 
 import { useStoreApi } from '../../hooks/useStore';
 import { ARIA_EDGE_DESC_KEY } from '../A11yDescriptions';
-import { handleMouseDown } from '../Handle/handler';
+import { handlePointerDown } from '../Handle/handler';
 import { EdgeAnchor } from './EdgeAnchor';
 import { getMarkerId } from '../../utils/graph';
 import { getMouseHandler } from './utils';
@@ -99,14 +99,14 @@ export default (EdgeComponent: ComponentType<EdgeProps>) => {
       setUpdating(true);
       onEdgeUpdateStart?.(event, edge, handleType);
 
-      const _onEdgeUpdateEnd = (evt: MouseEvent) => {
+      const _onEdgeUpdateEnd = (evt: MouseEvent | TouchEvent) => {
         setUpdating(false);
         onEdgeUpdateEnd?.(evt, edge, handleType);
       };
 
       const onConnectEdge = (connection: Connection) => onEdgeUpdate?.(edge, connection);
 
-      handleMouseDown({
+      handlePointerDown({
         event,
         handleId,
         nodeId,

packages/core/src/components/Handle/handler.ts

@@ -1,24 +1,17 @@
-import type { MouseEvent as ReactMouseEvent } from 'react';
+import type { MouseEvent as ReactMouseEvent, TouchEvent as ReactTouchEvent } from 'react';
 import { StoreApi } from 'zustand';
 
-import { getHostForElement, calcAutoPan } from '../../utils';
+import { getHostForElement, calcAutoPan, getEventPosition, isMouseEvent } from '../../utils';
 import type { OnConnect, HandleType, ReactFlowState } from '../../types';
 import { pointToRendererPoint, rendererPointToPoint } from '../../utils/graph';
-import {
-  ConnectionHandle,
-  getClosestHandle,
-  getConnectionPosition,
-  getHandleLookup,
-  isValidHandle,
-  ValidConnectionFunc,
-} from './utils';
+import { ConnectionHandle, getClosestHandle, getHandleLookup, isValidHandle, ValidConnectionFunc } from './utils';
 
 function resetRecentHandle(handleDomNode: Element): void {
   handleDomNode?.classList.remove('react-flow__handle-valid');
   handleDomNode?.classList.remove('react-flow__handle-connecting');
 }
 
-export function handleMouseDown({
+export function handlePointerDown({
   event,
   handleId,
   nodeId,
@@ -30,7 +23,7 @@ export function handleMouseDown({
   elementEdgeUpdaterType,
   onEdgeUpdateEnd,
 }: {
-  event: ReactMouseEvent;
+  event: ReactMouseEvent | ReactTouchEvent;
   handleId: string | null;
   nodeId: string;
   onConnect: OnConnect;
@@ -39,7 +32,7 @@ export function handleMouseDown({
   setState: StoreApi<ReactFlowState>['setState'];
   isValidConnection: ValidConnectionFunc;
   elementEdgeUpdaterType?: HandleType;
-  onEdgeUpdateEnd?: (evt: MouseEvent) => void;
+  onEdgeUpdateEnd?: (evt: MouseEvent | TouchEvent) => void;
 }): void {
   // when react-flow is used inside a shadow root we can't use document
   const doc = getHostForElement(event.target as HTMLElement);
@@ -48,7 +41,8 @@ export function handleMouseDown({
   let autoPanId = 0;
   let prevClosestHandle: ConnectionHandle | null;
 
-  const clickedElement = doc?.elementFromPoint(event.clientX, event.clientY);
+  const { clientX, clientY } = isMouseEvent(event) ? event : event.touches[0]!;
+  const clickedElement = doc?.elementFromPoint(clientX, clientY);
   const elementIsTarget = clickedElement?.classList.contains('target');
   const elementIsSource = clickedElement?.classList.contains('source');
 
@@ -59,7 +53,7 @@ export function handleMouseDown({
   const handleType = elementEdgeUpdaterType ? elementEdgeUpdaterType : elementIsTarget ? 'target' : 'source';
   const containerBounds = domNode.getBoundingClientRect();
   let prevActiveHandle: Element;
-  let connectionPosition = getConnectionPosition(event, containerBounds);
+  let connectionPosition = getEventPosition(event, containerBounds);
   let autoPanStarted = false;
 
   const handleLookup = getHandleLookup({
@@ -89,10 +83,10 @@ export function handleMouseDown({
 
   onConnectStart?.(event, { nodeId, handleId, handleType });
 
-  function onMouseMove(event: MouseEvent) {
+  function onPointerMove(event: MouseEvent | TouchEvent) {
     const { transform } = getState();
+    connectionPosition = getEventPosition(event, containerBounds);
 
-    connectionPosition = getConnectionPosition(event, containerBounds);
     prevClosestHandle = getClosestHandle(
       pointToRendererPoint(connectionPosition, transform, false, [1, 1]),
       connectionRadius,
@@ -138,7 +132,7 @@ export function handleMouseDown({
     }
   }
 
-  function onMouseUp(event: MouseEvent) {
+  function onPointerUp(event: MouseEvent | TouchEvent) {
     cancelAnimationFrame(autoPanId);
     autoPanStarted = false;
 
@@ -172,10 +166,16 @@ export function handleMouseDown({
       connectionHandleType: null,
     });
 
-    doc.removeEventListener('mousemove', onMouseMove as EventListenerOrEventListenerObject);
-    doc.removeEventListener('mouseup', onMouseUp as EventListenerOrEventListenerObject);
+    doc.removeEventListener('mousemove', onPointerMove as EventListener);
+    doc.removeEventListener('mouseup', onPointerUp as EventListener);
+
+    doc.removeEventListener('touchmove', onPointerMove as EventListener);
+    doc.removeEventListener('touchend', onPointerUp as EventListener);
   }
 
-  doc.addEventListener('mousemove', onMouseMove as EventListenerOrEventListenerObject);
-  doc.addEventListener('mouseup', onMouseUp as EventListenerOrEventListenerObject);
+  doc.addEventListener('mousemove', onPointerMove as EventListener);
+  doc.addEventListener('mouseup', onPointerUp as EventListener);
+
+  doc.addEventListener('touchmove', onPointerMove as EventListener);
+  doc.addEventListener('touchend', onPointerUp as EventListener);
 }

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

@@ -1,11 +1,11 @@
-import { memo, HTMLAttributes, forwardRef, MouseEvent as ReactMouseEvent } from 'react';
+import { memo, HTMLAttributes, forwardRef, MouseEvent as ReactMouseEvent, TouchEvent as ReactTouchEvent } from 'react';
 import cc from 'classcat';
 import { shallow } from 'zustand/shallow';
 
 import { useStore, useStoreApi } from '../../hooks/useStore';
 import { useNodeId } from '../../contexts/NodeIdContext';
-import { handleMouseDown } from './handler';
-import { devWarn, getHostForElement } from '../../utils';
+import { handlePointerDown } from './handler';
+import { devWarn, getHostForElement, isMouseEvent } from '../../utils';
 import { addEdge } from '../../utils/graph';
 import { Position } from '../../types';
 import type { HandleProps, Connection, ReactFlowState } from '../../types';
@@ -33,6 +33,7 @@ const Handle = forwardRef<HTMLDivElement, HandleComponentProps>(
       children,
       className,
       onMouseDown,
+      onTouchStart,
       ...rest
     },
     ref
@@ -66,9 +67,11 @@ const Handle = forwardRef<HTMLDivElement, HandleComponentProps>(
       onConnect?.(edgeParams);
     };
 
-    const onMouseDownHandler = (event: ReactMouseEvent<HTMLDivElement>) => {
-      if (event.button === 0) {
-        handleMouseDown({
+    const onPointerDown = (event: ReactMouseEvent<HTMLDivElement> | ReactTouchEvent<HTMLDivElement>) => {
+      const isMouse = isMouseEvent(event);
+
+      if ((isMouse && event.button === 0) || 'touches' in event) {
+        handlePointerDown({
           event,
           handleId,
           nodeId,
@@ -79,7 +82,12 @@ const Handle = forwardRef<HTMLDivElement, HandleComponentProps>(
           isValidConnection,
         });
       }
-      onMouseDown?.(event);
+
+      if (isMouse) {
+        onMouseDown?.(event);
+      } else {
+        onTouchStart?.(event);
+      }
     };
 
     const onClick = (event: ReactMouseEvent) => {
@@ -136,7 +144,8 @@ const Handle = forwardRef<HTMLDivElement, HandleComponentProps>(
               connectionStartHandle?.type === type,
           },
         ])}
-        onMouseDown={onMouseDownHandler}
+        onMouseDown={onPointerDown}
+        onTouchStart={onPointerDown}
         onClick={connectOnClick ? onClick : undefined}
         ref={ref}
         {...rest}

packages/core/src/components/Handle/utils.ts

@@ -1,5 +1,3 @@
-import { MouseEvent as ReactMouseEvent } from 'react';
-
 import { ConnectionMode } from '../../types';
 import type { Connection, HandleType, XYPosition, Node, NodeHandleBounds } from '../../types';
 import { internalsSymbol } from '../../utils';
@@ -134,10 +132,3 @@ export function getHandleLookup({ nodes, nodeId, handleId, handleType }: GetHand
     return res;
   }, []);
 }
-
-export function getConnectionPosition(event: MouseEvent | ReactMouseEvent, bounds: DOMRect): XYPosition {
-  return {
-    x: event.clientX - bounds.left,
-    y: event.clientY - bounds.top,
-  };
-}

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

@@ -11,8 +11,9 @@ import { containerStyle } from '../../styles';
 import { useStore, useStoreApi } from '../../hooks/useStore';
 import { getSelectionChanges } from '../../utils/changes';
 import { getConnectedEdges, getNodesInside } from '../../utils/graph';
+import { getEventPosition } from '../../utils';
 import { SelectionMode } from '../../types';
-import type { ReactFlowProps, XYPosition, ReactFlowState, NodeChange, EdgeChange } from '../../types';
+import type { ReactFlowProps, ReactFlowState, NodeChange, EdgeChange } from '../../types';
 
 type PaneProps = {
   isSelecting: boolean;
@@ -33,13 +34,6 @@ type PaneProps = {
   >
 >;
 
-function getMousePosition(event: ReactMouseEvent, containerBounds: DOMRect): XYPosition {
-  return {
-    x: event.clientX - containerBounds.left,
-    y: event.clientY - containerBounds.top,
-  };
-}
-
 const wrapHandler = (
   handler: React.MouseEventHandler | undefined,
   containerRef: React.MutableRefObject<HTMLDivElement | null>
@@ -118,7 +112,7 @@ const Pane = memo(
         return;
       }
 
-      const { x, y } = getMousePosition(event, containerBounds.current);
+      const { x, y } = getEventPosition(event, containerBounds.current);
 
       resetSelectedElements();
 
@@ -145,7 +139,7 @@ const Pane = memo(
 
       store.setState({ userSelectionActive: true, nodesSelectionActive: false });
 
-      const mousePos = getMousePosition(event, containerBounds.current);
+      const mousePos = getEventPosition(event, containerBounds.current);
       const startX = userSelectionRect.startX ?? 0;
       const startY = userSelectionRect.startY ?? 0;
 

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

@@ -7,7 +7,7 @@ import { useStoreApi } from '../../hooks/useStore';
 import { getDragItems, getEventHandlerParams, hasSelector, calcNextPosition } from './utils';
 import { handleNodeClick } from '../../components/Nodes/utils';
 import useGetPointerPosition from '../useGetPointerPosition';
-import { calcAutoPan } from '../../utils';
+import { calcAutoPan, getEventPosition } from '../../utils';
 import type { NodeDragItem, Node, SelectionDragHandler, UseDragEvent, XYPosition } from '../../types';
 
 export type UseDragData = { dx: number; dy: number };
@@ -168,10 +168,7 @@ function useDrag({
             }
 
             containerBounds.current = domNode?.getBoundingClientRect() || null;
-            mousePosition.current = {
-              x: event.sourceEvent.clientX - (containerBounds.current?.left ?? 0),
-              y: event.sourceEvent.clientY - (containerBounds.current?.top ?? 0),
-            };
+            mousePosition.current = getEventPosition(event.sourceEvent, containerBounds.current!);
           })
           .on('drag', (event: UseDragEvent) => {
             const pointerPos = getPointerPosition(event);
@@ -188,10 +185,7 @@ function useDrag({
               dragItems.current
             ) {
               dragEvent.current = event.sourceEvent as MouseEvent;
-              mousePosition.current = {
-                x: event.sourceEvent.clientX - (containerBounds.current?.left ?? 0),
-                y: event.sourceEvent.clientY - (containerBounds.current?.top ?? 0),
-              };
+              mousePosition.current = getEventPosition(event.sourceEvent, containerBounds.current!);
 
               updateNodes(pointerPos);
             }

packages/core/src/types/component-props.ts

@@ -61,7 +61,7 @@ export type ReactFlowProps = HTMLAttributes<HTMLDivElement> & {
   onEdgeMouseLeave?: EdgeMouseHandler;
   onEdgeDoubleClick?: EdgeMouseHandler;
   onEdgeUpdateStart?: (event: ReactMouseEvent, edge: Edge, handleType: HandleType) => void;
-  onEdgeUpdateEnd?: (event: MouseEvent, edge: Edge, handleType: HandleType) => void;
+  onEdgeUpdateEnd?: (event: MouseEvent | TouchEvent, edge: Edge, handleType: HandleType) => void;
   onNodesChange?: OnNodesChange;
   onEdgesChange?: OnEdgesChange;
   onNodesDelete?: OnNodesDelete;

packages/core/src/types/edges.ts

@@ -85,7 +85,7 @@ export type WrapEdgeProps<T = any> = Omit<Edge<T>, 'sourceHandle' | 'targetHandl
   onMouseLeave?: EdgeMouseHandler;
   edgeUpdaterRadius?: number;
   onEdgeUpdateStart?: (event: ReactMouseEvent, edge: Edge, handleType: HandleType) => void;
-  onEdgeUpdateEnd?: (event: MouseEvent, edge: Edge, handleType: HandleType) => void;
+  onEdgeUpdateEnd?: (event: MouseEvent | TouchEvent, edge: Edge, handleType: HandleType) => void;
   rfId?: string;
   isFocusable: boolean;
   pathOptions?: BezierPathOptions | SmoothStepPathOptions;

packages/core/src/types/general.ts

@@ -1,5 +1,10 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
-import type { MouseEvent as ReactMouseEvent, ComponentType, MemoExoticComponent } from 'react';
+import type {
+  MouseEvent as ReactMouseEvent,
+  TouchEvent as ReactTouchEvent,
+  ComponentType,
+  MemoExoticComponent,
+} from 'react';
 import type { D3DragEvent, Selection as D3Selection, SubjectPosition, ZoomBehavior } from 'd3';
 
 import type { XYPosition, Rect, Transform, CoordinateExtent } from './utils';
@@ -77,8 +82,8 @@ export type OnConnectStartParams = {
   handleType: HandleType | null;
 };
 
-export type OnConnectStart = (event: ReactMouseEvent, params: OnConnectStartParams) => void;
-export type OnConnectEnd = (event: MouseEvent) => void;
+export type OnConnectStart = (event: ReactMouseEvent | ReactTouchEvent, params: OnConnectStartParams) => void;
+export type OnConnectEnd = (event: MouseEvent | TouchEvent) => void;
 
 export type Viewport = {
   x: number;

packages/core/src/utils/index.ts

@@ -1,4 +1,8 @@
-import type { KeyboardEvent as ReactKeyboardEvent } from 'react';
+import type {
+  KeyboardEvent as ReactKeyboardEvent,
+  MouseEvent as ReactMouseEvent,
+  TouchEvent as ReactTouchEvent,
+} from 'react';
 
 import type { Dimensions, Node, XYPosition, CoordinateExtent, Box, Rect } from '../types';
 
@@ -111,3 +115,21 @@ export function isInputDOMNode(event: KeyboardEvent | ReactKeyboardEvent): boole
     !!target?.closest('.nokey')
   );
 }
+
+export const isMouseEvent = (
+  event: MouseEvent | ReactMouseEvent | TouchEvent | ReactTouchEvent
+): event is MouseEvent | ReactMouseEvent => 'button' in event;
+
+export const getEventPosition = (
+  event: MouseEvent | ReactMouseEvent | TouchEvent | ReactTouchEvent,
+  bounds: DOMRect
+) => {
+  const isMouse = isMouseEvent(event);
+  const evtX = isMouse ? event.clientX : event.touches?.[0].clientX;
+  const evtY = isMouse ? event.clientY : event.touches?.[0].clientY;
+
+  return {
+    x: evtX - bounds.left,
+    y: evtY - bounds.top,
+  };
+};