adds support for touch events, enabling touch dragging the canvas

packages/react-diagrams-core/src/states/DefaultDiagramState.ts

@@ -1,4 +1,4 @@
-import { MouseEvent } from 'react';
+import { MouseEvent, TouchEvent } from 'react';
 import {
 	SelectingState,
 	State,
@@ -48,5 +48,15 @@ export class DefaultDiagramState extends State<DiagramEngine> {
 				}
 			})
 		);
+
+		// touch drags the canvas
+		this.registerAction(
+			new Action({
+				type: InputType.TOUCH_START,
+				fire: (event: ActionEvent<TouchEvent>) => {
+					this.transitionWithEvent(this.dragCanvas, event);
+				}
+			})
+		);
 	}
 }