experimental/org.eclipse.sphinx.examples.hummingbird20.diagram.graphiti/src/org/eclipse/sphinx/examples/hummingbird20/diagram/graphiti/features/layout/LayoutPortFeature.java

/**
 * <copyright>
 * 
 * Copyright (c) 2012 itemis and others.
 * 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: 
 *     itemis - Initial API and implementation
 * 
 * </copyright>
 */
package org.eclipse.sphinx.examples.hummingbird20.diagram.graphiti.features.layout;

import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.context.ILayoutContext;
import org.eclipse.graphiti.features.impl.AbstractLayoutFeature;
import org.eclipse.graphiti.mm.pictograms.BoxRelativeAnchor;
import org.eclipse.sphinx.examples.hummingbird20.typemodel.Port;

public class LayoutPortFeature extends AbstractLayoutFeature {

	public LayoutPortFeature(final IFeatureProvider fp) {
		super(fp);
	}

	@Override
	public boolean canLayout(final ILayoutContext context) {
		Object object = getBusinessObjectForPictogramElement(context.getPictogramElement());
		return object instanceof Port;
	}

	@Override
	public boolean layout(final ILayoutContext context) {
		BoxRelativeAnchor boxAnchor = (BoxRelativeAnchor) context.getPictogramElement();
		float widthPercent = (float) boxAnchor.getRelativeWidth();
		float heightPercent = (float) boxAnchor.getRelativeHeight();
		float deltaY = heightPercent < 1.0f / 2.0f ? heightPercent : 1 - heightPercent;
		float deltaX = widthPercent < 1.0f / 2.0f ? widthPercent : 1 - widthPercent;
		if (deltaY < deltaX) {
			heightPercent = Math.round(heightPercent);
		} else {
			widthPercent = Math.round(widthPercent);
		}
		boxAnchor.setRelativeWidth(widthPercent);
		boxAnchor.setRelativeHeight(heightPercent);
		return true;
	}
}