maxGraph/packages/html/stories/Stencils.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,
  ConnectionHandler,
  DomHelpers,
  EdgeHandler,
  InternalEvent,
  Point,
  CellHighlight,
  constants,
  VertexHandler,
  RubberBandHandler,
  Shape,
  StencilShape,
  StencilShapeRegistry,
  CellRenderer,
  utils,
  load,
} from '@maxgraph/core';

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

export default {
  title: 'Shapes/Stencils',
  argTypes: {
    ...globalTypes,
    contextMenu: {
      type: 'boolean',
      defaultValue: false,
    },
    rubberBand: {
      type: 'boolean',
      defaultValue: true,
    },
  },
};

const Template = ({ label, ...args }) => {
  const div = document.createElement('div');

  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';
  div.appendChild(container);

  // Allow overriding constants?
  // Sets the global shadow color
  // constants.SHADOWCOLOR = '#C0C0C0';
  // constants.SHADOW_OPACITY = 0.5;
  // constants.SHADOW_OFFSET_X = 4;
  // constants.SHADOW_OFFSET_Y = 4;
  // constants.HANDLE_FILLCOLOR = '#99ccff';
  // constants.HANDLE_STROKECOLOR = '#0088cf';
  // constants.VERTEX_SELECTION_COLOR = '#00a8ff';

  // Enables connections along the outline
  ConnectionHandler.prototype.outlineConnect = true;
  EdgeHandler.prototype.manageLabelHandle = true;
  EdgeHandler.prototype.outlineConnect = true;
  CellHighlight.prototype.keepOnTop = true;

  // Enable rotation handle
  VertexHandler.prototype.rotationEnabled = true;

  // Uses the shape for resize previews
  VertexHandler.prototype.createSelectionShape = function (bounds) {
    const key = this.state.style.shape;
    const stencil = StencilShapeRegistry.getStencil(key);
    let shape = null;

    if (stencil != null) {
      shape = new Shape(stencil);
      shape.apply(this.state);
    } else {
      shape = new this.state.shape.constructor();
    }

    shape.outline = true;
    shape.bounds = bounds;
    shape.stroke = constants.HANDLE_STROKECOLOR;
    shape.strokewidth = this.getSelectionStrokeWidth();
    shape.isDashed = this.isSelectionDashed();
    shape.isShadow = false;
    return shape;
  };

  // Defines a custom stencil via the canvas API as defined here:
  // http://jgraph.github.io/mxgraph/docs/js-api/files/util/mxXmlCanvas2D-js.html

  class CustomShape extends Shape {
    paintBackground(c, x, y, w, h) {
      c.translate(x, y);

      // Head
      c.ellipse(w / 4, 0, w / 2, h / 4);
      c.fillAndStroke();

      c.begin();
      c.moveTo(w / 2, h / 4);
      c.lineTo(w / 2, (2 * h) / 3);

      // Arms
      c.moveTo(w / 2, h / 3);
      c.lineTo(0, h / 3);
      c.moveTo(w / 2, h / 3);
      c.lineTo(w, h / 3);

      // Legs
      c.moveTo(w / 2, (2 * h) / 3);
      c.lineTo(0, h);
      c.moveTo(w / 2, (2 * h) / 3);
      c.lineTo(w, h);
      c.end();

      c.stroke();
    }
  }

  // Replaces existing actor shape
  CellRenderer.registerShape('customShape', CustomShape);

  // Loads the stencils into the registry
  const req = load('stencils.xml');
  const root = req.getDocumentElement();
  let shape = root.firstChild;

  while (shape != null) {
    if (shape.nodeType === constants.NODETYPE.ELEMENT) {
      StencilShapeRegistry.addStencil(
        shape.getAttribute('name'),
        new StencilShape(shape)
      );
    }

    shape = shape.nextSibling;
  }

  if (!args.contextMenu) InternalEvent.disableContextMenu(container);

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

  graph.getTooltipForCell = function (cell) {
    if (cell != null) {
      return cell.style;
    }

    return null;
  };

  // Changes default styles
  let style = graph.getStylesheet().getDefaultEdgeStyle();
  style.edge = 'orthogonalEdgeStyle';
  style = graph.getStylesheet().getDefaultVertexStyle();
  style.fillColor = '#adc5ff';
  style.gradientColor = '#7d85df';
  style.shadow = '1';

  // 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 model in a single step
  graph.batchUpdate(() => {
    const v1 = graph.insertVertex(parent, null, 'A1', 20, 20, 40, 80, { shape: 'and' });
    const v2 = graph.insertVertex(parent, null, 'A2', 20, 220, 40, 80, { shape: 'and' });
    const v3 = graph.insertVertex(parent, null, 'X1', 160, 110, 80, 80, { shape: 'xor' });
    const e1 = graph.insertEdge(parent, null, '', v1, v3);
    e1.geometry.points = [new Point(90, 60), new Point(90, 130)];
    const e2 = graph.insertEdge(parent, null, '', v2, v3);
    e2.geometry.points = [new Point(90, 260), new Point(90, 170)];

    const v4 = graph.insertVertex(parent, null, 'A3', 520, 20, 40, 80, {
      shape: 'customShape',
      flipH: true,
    });
    const v5 = graph.insertVertex(parent, null, 'A4', 520, 220, 40, 80, {
      shape: 'and',
      flipH: true,
    });
    const v6 = graph.insertVertex(parent, null, 'X2', 340, 110, 80, 80, {
      shape: 'xor',
      flipH: true,
    });
    const e3 = graph.insertEdge(parent, null, '', v4, v6);
    e3.geometry.points = [new Point(490, 60), new Point(130, 130)];
    const e4 = graph.insertEdge(parent, null, '', v5, v6);
    e4.geometry.points = [new Point(490, 260), new Point(130, 170)];

    const v7 = graph.insertVertex(parent, null, 'O1', 250, 260, 80, 60, {
      shape: 'or',
      direction: 'south',
    });
    const e5 = graph.insertEdge(parent, null, '', v6, v7);
    e5.geometry.points = [new Point(310, 150)];
    const e6 = graph.insertEdge(parent, null, '', v3, v7);
    e6.geometry.points = [new Point(270, 150)];

    const e7 = graph.insertEdge(parent, null, '', v7, v5);
    e7.geometry.points = [new Point(290, 370)];
  });

  const buttons = document.createElement('div');
  div.appendChild(buttons);

  buttons.appendChild(
    DomHelpers.button('FlipH', function () {
      graph.toggleCellStyles('flipH');
    })
  );

  buttons.appendChild(
    DomHelpers.button('FlipV', function () {
      graph.toggleCellStyles('flipV');
    })
  );

  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));

  buttons.appendChild(
    DomHelpers.button('Rotate', function () {
      const cell = graph.getSelectionCell();

      if (cell != null) {
        let geo = cell.getGeometry();

        if (geo != null) {
          graph.batchUpdate(() => {
            // Rotates the size and position in the geometry
            geo = geo.clone();
            geo.x += geo.width / 2 - geo.height / 2;
            geo.y += geo.height / 2 - geo.width / 2;
            const tmp = geo.width;
            geo.width = geo.height;
            geo.height = tmp;
            graph.getDataModel().setGeometry(cell, geo);

            // Reads the current direction and advances by 90 degrees
            const state = graph.view.getState(cell);

            if (state != null) {
              let dir = state.style.direction || 'east'; /* default */

              if (dir === 'east') {
                dir = 'south';
              } else if (dir === 'south') {
                dir = 'west';
              } else if (dir === 'west') {
                dir = 'north';
              } else if (dir === 'north') {
                dir = 'east';
              }

              graph.setCellStyles('direction', dir, [cell]);
            }
          });
        }
      }
    })
  );

  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));

  buttons.appendChild(
    DomHelpers.button('And', function () {
      graph.setCellStyles('shape', 'and');
    })
  );
  buttons.appendChild(
    DomHelpers.button('Or', function () {
      graph.setCellStyles('shape', 'or');
    })
  );
  buttons.appendChild(
    DomHelpers.button('Xor', function () {
      graph.setCellStyles('shape', 'xor');
    })
  );

  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));
  buttons.appendChild(document.createTextNode('\u00a0'));

  buttons.appendChild(
    DomHelpers.button('Style', function () {
      const cell = graph.getSelectionCell();

      if (cell != null) {
        const style = utils.prompt('Style', cell.getStyle());

        if (style != null) {
          graph.getDataModel().setStyle(cell, style);
        }
      }
    })
  );

  buttons.appendChild(
    DomHelpers.button('+', function () {
      graph.zoomIn();
    })
  );
  buttons.appendChild(
    DomHelpers.button('-', function () {
      graph.zoomOut();
    })
  );

  return div;
};

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