maxGraph/packages/html/stories/Merge.stories.js

import { Graph, Perimeter, constants, RubberBandHandler } from '@maxgraph/core';

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

export default {
  title: 'Misc/Merge',
  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';

  // Should we allow overriding constants?
  // constants.SHADOWCOLOR = '#c0c0c0';

  // Creates the graph inside the given container
  const graph = new Graph(container);

  // No size handles, please...
  graph.setCellsResizable(false);

  // Makes all cells round with a white, bold label
  let style = graph.stylesheet.getDefaultVertexStyle();
  style.shape = constants.SHAPE.ELLIPSE;
  style.perimiter = Perimeter.EllipsePerimeter;
  style.fontColor = 'white';
  style.gradientColor = 'white';
  style.fontStyle = constants.FONT.BOLD;
  style.fontSize = 14;
  style.shadow = true;

  // Makes all edge labels gray with a white background
  style = graph.stylesheet.getDefaultEdgeStyle();
  style.fontColor = 'gray';
  style.fontStyle = constants.FONT.BOLD;
  style.fontColor = 'black';
  style.strokeWidth = 2;

  // Enables rubberband selection
  if (args.rubberBand) new RubberBandHandler(graph);

  // 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 target model in a single step
  // using custom ids for the vertices and edges
  const w = 40;
  const h = 40;

  graph.batchUpdate(() => {
    const a = graph.insertVertex(parent, 'a', 'A', 20, 20, w, h, { fillColor: 'blue' });
    const b = graph.insertVertex(parent, 'b', 'B', 20, 200, w, h, { fillColor: 'blue' });
    const c = graph.insertVertex(parent, 'c', 'C', 200, 20, w, h, { fillColor: 'red' });
    const d = graph.insertVertex(parent, 'd', 'D', 200, 200, w, h, { fillColor: 'red' });
    const ac = graph.insertEdge(parent, 'ac', 'ac', a, c, {
      strokeColor: 'blue',
      verticalAlign: 'bottom',
    });
    const ad = graph.insertEdge(parent, 'ad', 'ad', a, d, {
      strokeColor: 'blue',
      align: 'left',
      verticalAlign: 'bottom',
    });
    const bd = graph.insertEdge(parent, 'bd', 'bd', b, d, {
      strokeColor: 'blue',
      verticalAlign: 'bottom',
    });
  });

  // Creates the second graph model (without a container)
  const graph2 = new Graph();

  // Gets the default parent for inserting new cells. This
  // is normally the first child of the root (ie. layer 0).
  const parent2 = graph2.getDefaultParent();

  // Adds cells to the target model in a single step
  // using custom ids for the vertices
  graph2.batchUpdate(() => {
    const c = graph2.insertVertex(parent2, 'c', 'C', 200, 20, w, h, {
      fillColor: 'green',
    });
    const d = graph2.insertVertex(parent2, 'd', 'D', 200, 200, w, h, {
      fillColor: 'green',
    });
    const e = graph2.insertVertex(parent2, 'e', 'E', 400, 20, w, h, {
      fillColor: 'green',
    });
    const f = graph2.insertVertex(parent2, 'f', 'F', 400, 200, w, h, {
      fillColor: 'green',
    });
    const ce = graph2.insertEdge(parent2, 'ce', 'ce', c, e, {
      strokeColor: 'green',
      verticalAlign: 'bottom',
    });
    const ed = graph2.insertEdge(parent2, 'ed', 'ed', e, d, {
      strokeColor: 'green',
      align: 'right',
      verticalAlign: 'bottom',
    });
    const fd = graph2.insertEdge(parent2, 'bd', 'fd', f, d, {
      strokeColor: 'green',
      verticalAlign: 'bottom',
    });
  });

  // Merges the model from the second graph into the model of
  // the first graph. Note: If you add a false to the parameter
  // list then _not_ all edges will be cloned, that is, the
  // edges are assumed to have an identity, and hence the edge
  // "bd" will be changed to point from f to d, as specified in
  // the edge for the same id in the second graph.
  graph.getDataModel().mergeChildren(parent2, parent /* , false */);

  return container;
};

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