bundles/common/org.eclipse.apogy.common.emf.ui/src/org/eclipse/apogy/common/emf/ui/parts/GlobalDocumentationPart.java

/*******************************************************************************
 * Copyright (c) 2018 Agence spatiale canadienne / Canadian Space Agency
 * 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:
 *     Pierre Allard - initial API and implementation
 *     Regent L'Archeveque,
 *     Olivier L. Larouche
 * 
 * SPDX-License-Identifier: EPL-1.0
 *******************************************************************************/
package org.eclipse.apogy.common.emf.ui.parts;

import java.util.HashMap;

import org.eclipse.apogy.common.emf.ui.composites.EObjectDocumentationComposite;
import org.eclipse.e4.ui.model.application.ui.basic.MPart;
import org.eclipse.e4.ui.workbench.modeling.ISelectionListener;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;

public class GlobalDocumentationPart extends AbstractEObjectSelectionPart {

	private ISelectionListener selectionListener;

	@Override
	protected EObject getInitializeObject() {
		this.selectionService.addSelectionListener(getSelectionListener());
		Object obj = this.selectionService.getSelection();

		if (obj instanceof EObject) {
			return (EObject) obj;
		}
		return null;
	}

	@Override
	protected void setCompositeContents(EObject eObject) {
		((EObjectDocumentationComposite) getActualComposite()).setEObject(eObject);
	}

	@Override
	protected void createContentComposite(Composite parent, int style) {
		new EObjectDocumentationComposite(parent, SWT.None);
	}

	@Override
	public void userPreDestroy(MPart mPart) {
		this.selectionService.removeSelectionListener(getSelectionListener());
	}

	private ISelectionListener getSelectionListener() {
		if (this.selectionListener == null) {
			this.selectionListener = new ISelectionListener() {
				@Override
				public void selectionChanged(MPart part, Object selection) {
					if (selection == null || selection instanceof EObject) {
						setEObject((EObject) selection);
					}
				}
			};
		}
		return this.selectionListener;
	}

	@Override
	protected HashMap<String, ISelectionListener> getSelectionProvidersIdsToSelectionListeners() {
		return null;
	}

}