maxGraph/packages/html/stories/Control.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,
  RubberBandHandler,
  DomHelpers,
  ImageShape,
  Rectangle,
  CellRenderer,
  ImageBox,
} from '@maxgraph/core';

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

export default {
  title: 'Icon_Images/Control',
  argTypes: {
    ...globalTypes,
    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);

  // Specifies the URL and size of the new control
  const deleteImage = new ImageBox('/images/forbidden.png', 16, 16);

  class MyCustomCellRenderer extends CellRenderer {
    createControl(state) {
      super.createControl(state);

      const { graph } = state.view;

      if (state.cell.isVertex()) {
        if (state.deleteControl == null) {
          const b = new Rectangle(0, 0, deleteImage.width, deleteImage.height);
          state.deleteControl = new ImageShape(b, deleteImage.src);
          state.deleteControl.dialect = graph.dialect;
          state.deleteControl.preserveImageAspect = false;

          this.initControl(state, state.deleteControl, false, function (evt) {
            if (graph.isEnabled()) {
              graph.removeCells([state.cell]);
              InternalEvent.consume(evt);
            }
          });
        }
      } else if (state.deleteControl != null) {
        state.deleteControl.destroy();
        state.deleteControl = null;
      }
    }

    getDeleteControlBounds(state) {
      // Helper function to compute the bounds of the control
      if (state.deleteControl != null) {
        const oldScale = state.deleteControl.scale;
        const w = state.deleteControl.bounds.width / oldScale;
        const h = state.deleteControl.bounds.height / oldScale;
        const s = state.view.scale;

        return state.cell.isEdge()
          ? new Rectangle(
              state.x + state.width / 2 - (w / 2) * s,
              state.y + state.height / 2 - (h / 2) * s,
              w * s,
              h * s
            )
          : new Rectangle(state.x + state.width - w * s, state.y, w * s, h * s);
      }
      return null;
    }

    redrawControl(state) {
      // Overridden to update the scale and bounds of the control
      super.redrawControl(state);

      if (state.deleteControl != null) {
        const bounds = this.getDeleteControlBounds(state);
        const s = state.view.scale;

        if (
          state.deleteControl.scale !== s ||
          !state.deleteControl.bounds.equals(bounds)
        ) {
          state.deleteControl.bounds = bounds;
          state.deleteControl.scale = s;
          state.deleteControl.redraw();
        }
      }
    }

    destroy(state) {
      // Overridden to remove the control if the state is destroyed
      super.destroy(state);

      if (state.deleteControl != null) {
        state.deleteControl.destroy();
        state.deleteControl = null;
      }
    }
  }

  class MyCustomGraph extends Graph {
    createCellRenderer() {
      return new MyCustomCellRenderer();
    }
  }

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

  // Uncomment the following if you want the container
  // to fit the size of the graph
  // graph.setResizeContainer(true);

  // 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,
      value: 'Hello,',
      position: [20, 20],
      size: [80, 30],
    });
    const v2 = graph.insertVertex({
      parent,
      value: 'World!',
      position: [200, 150],
      size: [80, 30],
    });
    const e1 = graph.insertEdge({
      parent,
      source: v1,
      target: v2,
    });
  });

  graph.centerZoom = false;

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

  buttons.appendChild(
    DomHelpers.button('Zoom In', () => {
      graph.zoomIn();
    })
  );

  buttons.appendChild(
    DomHelpers.button('Zoom Out', () => {
      graph.zoomOut();
    })
  );

  return div;
};

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