maxGraph/packages/html/stories/Validation.stories.js

import {
  Graph,
  RubberBandHandler,
  xmlUtils,
  Multiplicity,
  KeyHandler,
  InternalEvent,
} from '@maxgraph/core';

import { globalTypes } from '../.storybook/preview';

export default {
  title: 'Misc/Validation',
  argTypes: {
    ...globalTypes,
    rubberBand: {
      type: 'boolean',
      defaultValue: true,
    },
  },
};

const Template = ({ label, ...args }) => {
  const container = document.createElement('div');
  container.style.position = 'relative';
  container.style.overflow = 'hidden';
  container.style.width = `${args.width}px`;
  container.style.height = `${args.height}px`;
  container.style.background = 'url(/images/grid.gif)';
  container.style.cursor = 'default';

  const xmlDocument = xmlUtils.createXmlDocument();
  const sourceNode = xmlDocument.createElement('Source');
  const targetNode = xmlDocument.createElement('Target');
  const subtargetNode = xmlDocument.createElement('Subtarget');

  // Creates the graph inside the given container
  const graph = new Graph(container);
  graph.setConnectable(true);
  graph.setTooltips(true);
  graph.setAllowDanglingEdges(false);
  graph.setMultigraph(false);

  // Source nodes needs 1..2 connected Targets
  graph.multiplicities.push(
    new Multiplicity(
      true,
      'Source',
      null,
      null,
      1,
      2,
      ['Target'],
      'Source Must Have 1 or 2 Targets',
      'Source Must Connect to Target'
    )
  );

  // Source node does not want any incoming connections
  graph.multiplicities.push(
    new Multiplicity(
      false,
      'Source',
      null,
      null,
      0,
      0,
      null,
      'Source Must Have No Incoming Edge',
      null
    )
  ); // Type does not matter

  // Target needs exactly one incoming connection from Source
  graph.multiplicities.push(
    new Multiplicity(
      false,
      'Target',
      null,
      null,
      1,
      1,
      ['Source'],
      'Target Must Have 1 Source',
      'Target Must Connect From Source'
    )
  );

  // Enables rubberband selection
  new RubberBandHandler(graph);

  // Removes cells when [DELETE] is pressed
  const keyHandler = new KeyHandler(graph);
  keyHandler.bindKey(46, function (evt) {
    if (graph.isEnabled()) {
      graph.removeCells();
    }
  });

  // Installs automatic validation (use editor.validation = true
  // if you are using an Editor instance)
  const listener = function (sender, evt) {
    graph.validateGraph();
  };

  graph.getDataModel().addListener(InternalEvent.CHANGE, listener);

  // Gets the default parent for inserting new cells. This
  // is normally the first child of the root (ie. layer 0).
  const parent = graph.getDefaultParent();

  // Adds cells to the model in a single step
  graph.batchUpdate(() => {
    const v1 = graph.insertVertex(parent, null, sourceNode, 20, 20, 80, 30);
    const v2 = graph.insertVertex(parent, null, targetNode, 200, 20, 80, 30);
    const v3 = graph.insertVertex({
      parent,
      value: targetNode.cloneNode(true),
      position: [200, 80],
      size: [80, 30],
    });
    const v4 = graph.insertVertex(
      parent,
      null,
      targetNode.cloneNode(true),
      200,
      140,
      80,
      30
    );
    const v5 = graph.insertVertex(parent, null, subtargetNode, 200, 200, 80, 30);
    const v6 = graph.insertVertex(
      parent,
      null,
      sourceNode.cloneNode(true),
      20,
      140,
      80,
      30
    );
    const e1 = graph.insertEdge(parent, null, '', v1, v2);
    const e2 = graph.insertEdge(parent, null, '', v1, v3);
    const e3 = graph.insertEdge(parent, null, '', v6, v4);
    // var e4 = graph.insertEdge(parent, null, '', v1, v4);
  });

  return container;
};

export const Default = Template.bind({});