maxGraph/packages/html/stories/Constituent.stories.js

/*
Copyright 2021-present The maxGraph project Contributors
Copyright (c) 2006-2020, JGraph Ltd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import {
  Graph,
  InternalEvent,
  SelectionHandler,
  RubberBandHandler,
} from '@maxgraph/core';

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

export default {
  title: 'Layouts/Constituent',
  argTypes: {
    ...globalTypes,
    contextMenu: {
      type: 'boolean',
      defaultValue: false,
    },
    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';

  // Disables the built-in context menu
  InternalEvent.disableContextMenu(container);

  class MyCustomGraphHandler extends SelectionHandler {
    /**
     * Redirects start drag to parent.
     */
    getInitialCellForEvent(me) {
      let cell = super.getInitialCellForEvent(me);
      if (this.graph.isPart(cell)) {
        cell = cell.getParent();
      }
      return cell;
    }
  }

  class MyCustomGraph extends Graph {
    foldingEnabled = false;

    recursiveResize = true;

    isPart(cell) {
      // Helper method to mark parts with constituent=1 in the style
      return this.getCurrentCellStyle(cell).constituent == '1';
    }

    selectCellForEvent(cell, evt) {
      // Redirects selection to parent
      if (this.isPart(cell)) {
        cell = cell.getParent();
      }
      super.selectCellForEvent(cell, evt);
    }

    createGraphHandler() {
      return new MyCustomGraphHandler(this);
    }
  }

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

  // Enables rubberband selection
  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 model in a single step
  graph.batchUpdate(() => {
    const v1 = graph.insertVertex({
      parent,
      position: [20, 20],
      size: [120, 70],
    });
    const v2 = graph.insertVertex({
      parent: v1,
      value: 'Constituent',
      position: [20, 20],
      size: [80, 30],
      style: {
        constituent: 1,
      },
    });
  });

  return container;
};

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