org.eclipse.fmc.blockdiagram.editor/src/org/eclipse/fmc/blockdiagram/editor/features/add/AnchorAddFeature.java

/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2013, 2013 SAP AG.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    SAP AG - initial API, implementation and documentation
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.fmc.blockdiagram.editor.features.add;

import org.eclipse.fmc.blockdiagram.editor.algorithm.node.AnchoredNode;
import org.eclipse.fmc.blockdiagram.editor.algorithm.node.FMCNodeAlgorithmFactory;
import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.context.IAddContext;
import org.eclipse.graphiti.features.impl.AbstractAddPictogramElementFeature;
import org.eclipse.graphiti.mm.pictograms.BoxRelativeAnchor;
import org.eclipse.graphiti.mm.pictograms.ContainerShape;
import org.eclipse.graphiti.mm.pictograms.Diagram;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;

/**
 * This class is responsible for adding an additional anchor to a shape.
 * 
 * @author Benjamin Schmeling
 * 
 */
public class AnchorAddFeature extends AbstractAddPictogramElementFeature {

	/**
	 * Factory for fmc node algorithms. 
	 */
	private FMCNodeAlgorithmFactory factory = FMCNodeAlgorithmFactory
			.getInstance();

	/**
	 * The main constructor.
	 * 
	 * @param featureProvider The feature provider.
	 */
	public AnchorAddFeature(IFeatureProvider featureProvider) {
		super(featureProvider);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.graphiti.func.IAdd#canAdd(org.eclipse.graphiti.features.context
	 * .IAddContext)
	 */
	@Override
	public boolean canAdd(IAddContext context) {
		ContainerShape targetContainer = context.getTargetContainer();
		return !(targetContainer instanceof Diagram) && targetContainer != null
				&& targetContainer.isActive();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.graphiti.func.IAdd#add(org.eclipse.graphiti.features.context
	 * .IAddContext)
	 */
	@Override
	public PictogramElement add(IAddContext context) {
		ContainerShape targetContainer = context.getTargetContainer();
		double relativeWidth = ((double) context.getX())
				/ ((double) targetContainer.getGraphicsAlgorithm().getWidth());
		double relativeHeight = ((double) context.getY())
				/ ((double) targetContainer.getGraphicsAlgorithm().getHeight());
		BoxRelativeAnchor boxAnchor = factory.getHumanAgent().createBoxAnchor(
				targetContainer, relativeWidth, relativeHeight,
				AnchoredNode.DEFAULT_ANCHOR_DIAMETER,
				AnchoredNode.DEFAULT_ANCHOR_DIAMETER);
		boxAnchor.getGraphicsAlgorithm().setFilled(true);
		boxAnchor.getGraphicsAlgorithm().setLineVisible(true);
		return null;
	}

}