AbstractAddBoundaryFeature.java

package org.activiti.designer.features;

import org.activiti.bpmn.model.Activity;
import org.activiti.bpmn.model.BoundaryEvent;
import org.activiti.designer.util.style.StyleUtil;
import org.eclipse.graphiti.datatypes.ILocation;
import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.context.IAddContext;
import org.eclipse.graphiti.features.impl.AbstractAddShapeFeature;
import org.eclipse.graphiti.mm.algorithms.Ellipse;
import org.eclipse.graphiti.mm.algorithms.Image;
import org.eclipse.graphiti.mm.pictograms.ContainerShape;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;
import org.eclipse.graphiti.mm.pictograms.Shape;
import org.eclipse.graphiti.services.Graphiti;
import org.eclipse.graphiti.services.IGaService;
import org.eclipse.graphiti.services.IPeCreateService;

public abstract class AbstractAddBoundaryFeature extends AbstractAddShapeFeature {

  protected static final int IMAGE_SIZE = 20;
  protected static final int EVENT_SIZE = 30;

  public AbstractAddBoundaryFeature(IFeatureProvider fp) {
    super(fp);
  }

  @Override
  public PictogramElement add(IAddContext context) {
    final BoundaryEvent addedEvent = (BoundaryEvent) context.getNewObject();
    ContainerShape parent = context.getTargetContainer();
    int x = context.getX();
    int y = context.getY();

    ILocation shapeLocation = Graphiti.getLayoutService().getLocationRelativeToDiagram(parent);
    x += shapeLocation.getX();
    y += shapeLocation.getY();
    
    parent = getDiagram();

    // CONTAINER SHAPE WITH CIRCLE
    final IPeCreateService peCreateService = Graphiti.getPeCreateService();
    final ContainerShape containerShape = peCreateService.createContainerShape(parent, true);

    // check whether the context has a size (e.g. from a create feature)
    // otherwise define a default size for the shape
    final int width = context.getWidth() <= 0 ? EVENT_SIZE : context.getWidth();
    final int height = context.getHeight() <= 0 ? EVENT_SIZE : context.getHeight();

    final IGaService gaService = Graphiti.getGaService();

    Ellipse circle;
    {
      final Ellipse invisibleCircle = gaService.createEllipse(containerShape);
      invisibleCircle.setFilled(false);
      invisibleCircle.setLineVisible(false);
      gaService.setLocationAndSize(invisibleCircle, x, y, width, height);

      // create and set visible circle inside invisible circle
      circle = gaService.createEllipse(invisibleCircle);
      circle.setParentGraphicsAlgorithm(invisibleCircle);
      circle.setStyle(StyleUtil.getStyleForEvent(getDiagram()));
      gaService.setLocationAndSize(circle, 0, 0, width, height);

      // create link and wire it
      link(containerShape, addedEvent);
    }

    {
      Ellipse secondCircle = gaService.createEllipse(circle);
      secondCircle.setParentGraphicsAlgorithm(circle);
      secondCircle.setStyle(StyleUtil.getStyleForEvent(getDiagram()));
      gaService.setLocationAndSize(secondCircle, 3, 3, width - 6, height - 6);
    }

    {
      final Shape shape = peCreateService.createShape(containerShape, false);
      final Image image = gaService.createImage(shape, getImageKey());
      image.setWidth(IMAGE_SIZE);
      image.setHeight(IMAGE_SIZE);

      gaService.setLocationAndSize(image, (width - IMAGE_SIZE) / 2, (height - IMAGE_SIZE) / 2, IMAGE_SIZE, IMAGE_SIZE);
    }

    // add a chopbox anchor to the shape
    peCreateService.createChopboxAnchor(containerShape);
    layoutPictogramElement(containerShape);

    return containerShape;
  }

  @Override
  public boolean canAdd(IAddContext context) {
    Object parentObject = getBusinessObjectForPictogramElement(context.getTargetContainer());
    if (parentObject instanceof Activity == false) {
      return false;
    }
    if (context.getNewObject() instanceof BoundaryEvent == false) {
      return false;
    }
    return true;
  }
  
  protected abstract String getImageKey();
}