/*******************************************************************************
 * <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.custom;

import org.eclipse.fmc.blockdiagram.editor.algorithm.node.FMCNodeAlgorithm;
import org.eclipse.fmc.blockdiagram.editor.algorithm.node.FMCNodeAlgorithmFactory;
import org.eclipse.fmc.blockdiagram.editor.diagram.BlockDiagramImageProvider;
import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.context.ICustomContext;
import org.eclipse.graphiti.mm.pictograms.ContainerShape;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;

/**
 * Rotates the selected polygon by 90 degrees to the right.
 * 
 * @author Heiko Witteborg
 * 
 */
public class HideContentCustomFeature extends FMCCustomFeature {

	/**
	 * Boolean to track whether something has changed in diagram.
	 */
	private boolean hasDoneChanges = false;

	/**
	 * The default constructor.
	 * 
	 * @param featureProvider
	 *            The feature provider.
	 */
	public HideContentCustomFeature(IFeatureProvider featureProvider) {
		super(featureProvider, "Transform");
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.graphiti.features.impl.AbstractFeature#getName()
	 */
	@Override
	public String getName() {
		return "Hide Content";
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.graphiti.features.custom.AbstractCustomFeature#getImageId()
	 */
	@Override
	public String getImageId() {
		return BlockDiagramImageProvider.ICON_HIDE_CONTENT + BlockDiagramImageProvider.SIZE_16;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.graphiti.features.custom.AbstractCustomFeature#getDescription
	 * ()
	 */
	@Override
	public String getDescription() {
		return "Hide the contained elements";
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.graphiti.features.custom.AbstractCustomFeature#canExecute
	 * (org.eclipse.graphiti.features.context.ICustomContext)
	 */
	@Override
	public boolean canExecute(ICustomContext context) {
		// allow rotate if exactly one pictogram element representing a Polygon
		// is selected
		boolean ret = false;
		PictogramElement[] pes = context.getPictogramElements();
		if (pes != null && pes.length == 1
				&& context.getPictogramElements()[0] instanceof ContainerShape) {
			ContainerShape container = (ContainerShape) context
					.getPictogramElements()[0];
			FMCNodeAlgorithm na = FMCNodeAlgorithmFactory.getInstance()
					.getShape(container);
			ret = na != null && !na.isEmpty(container)
					&& !na.isHiding(container);
		}
		return ret;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.graphiti.features.custom.ICustomFeature#execute(org.eclipse
	 * .graphiti.features.context.ICustomContext)
	 */
	@Override
	public void execute(ICustomContext context) {
		PictogramElement[] pes = context.getPictogramElements();
		if (pes != null && pes.length == 1) {
			ContainerShape firstLevelContainer = (ContainerShape) context
					.getPictogramElements()[0];
			FMCNodeAlgorithm na = FMCNodeAlgorithmFactory.getInstance()
					.getShape(firstLevelContainer);
			na.hideContainedShapes(firstLevelContainer, true);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.graphiti.features.impl.AbstractFeature#hasDoneChanges()
	 */
	@Override
	public boolean hasDoneChanges() {
		return this.hasDoneChanges;
	}
}