react-diagrams/diagrams-demo-gallery/demos/demo-canvas-drag/index.tsx

import * as React from 'react';
import createEngine, { DiagramModel, DefaultNodeModel } from '@projectstorm/react-diagrams';
import { DemoButton, DemoWorkspaceWidget } from '../helpers/DemoWorkspaceWidget';
import { CanvasWidget } from '@projectstorm/react-canvas-core';
import { DemoCanvasWidget } from '../helpers/DemoCanvasWidget';

/**
 * Tests the drag on/off
 */
class CanvasDragToggle extends React.Component<any, any> {
	enableDrag = () => {
		const { engine } = this.props;
		const state = engine.getStateMachine().getCurrentState();
		state.dragCanvas.config.allowDrag = true;
	};

	disableDrag = () => {
		const { engine } = this.props;
		const state = engine.getStateMachine().getCurrentState();
		state.dragCanvas.config.allowDrag = false;
	};

	render() {
		const { engine } = this.props;
		return (
			<DemoWorkspaceWidget
				buttons={[
					<DemoButton key={1} onClick={this.enableDrag}>
						Enable canvas drag
					</DemoButton>,
					<DemoButton key={2} onClick={this.disableDrag}>
						Disable canvas drag
					</DemoButton>
				]}
			>
				<DemoCanvasWidget>
					<CanvasWidget engine={engine} />
				</DemoCanvasWidget>
			</DemoWorkspaceWidget>
		);
	}
}

export default () => {
	//1) setup the diagram engine
	var engine = createEngine();

	//2) setup the diagram model
	var model = new DiagramModel();

	//3-A) create a default node
	var node1 = new DefaultNodeModel('Node 1', 'rgb(0,192,255)');
	var port1 = node1.addOutPort('Out');
	node1.setPosition(100, 100);

	//3-B) create another default node
	var node2 = new DefaultNodeModel('Node 2', 'rgb(192,255,0)');
	var port2 = node2.addInPort('In');
	node2.setPosition(400, 100);

	//3-C) link the 2 nodes together
	var link1 = port1.link(port2);

	//4) add the models to the root graph
	model.addAll(node1, node2, link1);

	//5) load model into engine
	engine.setModel(model);

	//6) render the diagram!
	return <CanvasDragToggle engine={engine} model={model} />;
};