maxGraph/packages/html/stories/Handles.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,
  CylinderShape,
  DomHelpers,
  CellRenderer,
  Point,
  Rectangle,
  VertexHandler,
  InternalEvent,
  RubberBandHandler,
  utils,
  VertexHandle,
} from '@maxgraph/core';

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

export default {
  title: 'Layouts/Handles',
  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);

  class MyShape extends CylinderShape {
    defaultPos1 = 20;

    defaultPos2 = 60;

    getLabelBounds(rect) {
      const pos1 = utils.getValue(this.style, 'pos1', this.defaultPos1) * this.scale;
      const pos2 = utils.getValue(this.style, 'pos2', this.defaultPos2) * this.scale;
      return new Rectangle(
        rect.x,
        rect.y + pos1,
        rect.width,
        Math.min(rect.height, pos2) - Math.max(0, pos1)
      );
    }

    redrawPath(path, x, y, w, h, isForeground) {
      const pos1 = utils.getValue(this.style, 'pos1', this.defaultPos1);
      const pos2 = utils.getValue(this.style, 'pos2', this.defaultPos2);

      if (isForeground) {
        if (pos1 < h) {
          path.moveTo(0, pos1);
          path.lineTo(w, pos1);
        }

        if (pos2 < h) {
          path.moveTo(0, pos2);
          path.lineTo(w, pos2);
        }
      } else {
        path.rect(0, 0, w, h);
      }
    }
  }
  CellRenderer.registerShape('myShape', MyShape);

  class MyCustomVertexHandler extends VertexHandler {
    livePreview = true;

    rotationEnabled = true;

    createCustomHandles() {
      if (this.state.style.shape === 'myShape') {
        // Implements the handle for the first divider
        const firstHandle = new VertexHandle(this.state);

        firstHandle.getPosition = function (bounds) {
          const pos2 = Math.max(
            0,
            Math.min(
              bounds.height,
              parseFloat(
                utils.getValue(this.state.style, 'pos2', MyShape.prototype.defaultPos2)
              )
            )
          );
          const pos1 = Math.max(
            0,
            Math.min(
              pos2,
              parseFloat(
                utils.getValue(this.state.style, 'pos1', MyShape.prototype.defaultPos1)
              )
            )
          );

          return new Point(bounds.getCenterX(), bounds.y + pos1);
        };

        firstHandle.setPosition = function (bounds, pt) {
          const pos2 = Math.max(
            0,
            Math.min(
              bounds.height,
              parseFloat(
                utils.getValue(this.state.style, 'pos2', MyShape.prototype.defaultPos2)
              )
            )
          );

          this.state.style.pos1 = Math.round(
            Math.max(0, Math.min(pos2, pt.y - bounds.y))
          );
        };

        firstHandle.execute = function () {
          this.copyStyle('pos1');
        };

        firstHandle.ignoreGrid = true;

        // Implements the handle for the second divider
        const secondHandle = new VertexHandle(this.state);

        secondHandle.getPosition = function (bounds) {
          const pos1 = Math.max(
            0,
            Math.min(
              bounds.height,
              parseFloat(
                utils.getValue(this.state.style, 'pos1', MyShape.prototype.defaultPos1)
              )
            )
          );
          const pos2 = Math.max(
            pos1,
            Math.min(
              bounds.height,
              parseFloat(
                utils.getValue(this.state.style, 'pos2', MyShape.prototype.defaultPos2)
              )
            )
          );

          return new Point(bounds.getCenterX(), bounds.y + pos2);
        };

        secondHandle.setPosition = function (bounds, pt) {
          const pos1 = Math.max(
            0,
            Math.min(
              bounds.height,
              parseFloat(
                utils.getValue(this.state.style, 'pos1', MyShape.prototype.defaultPos1)
              )
            )
          );

          this.state.style.pos2 = Math.round(
            Math.max(pos1, Math.min(bounds.height, pt.y - bounds.y))
          );
        };

        secondHandle.execute = function () {
          this.copyStyle('pos2');
        };

        secondHandle.ignoreGrid = true;

        return [firstHandle, secondHandle];
      }

      return null;
    }
  }

  class MyCustomGraph extends Graph {
    createVertexHandler(state) {
      return new MyCustomVertexHandler(state);
    }
  }

  // Disables the built-in context menu
  if (!args.contextMenu) InternalEvent.disableContextMenu(container);

  // Creates the graph inside the given container
  const graph = new MyCustomGraph(container);
  graph.setCellsCloneable(true);
  graph.setHtmlLabels(true);
  graph.setPanning(true);
  graph.centerZoom = false;

  // 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,
      'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.',
      20,
      20,
      240,
      120,
      { shape: 'myShape', whiteSpace: 'wrap', overflow: 'hidden', pos1: 30, pos2: 80 }
    );
  });

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

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

  return div;
};

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