ClearContentsAction.java example

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/**
 * Copyright 2004-2016 Riccardo Solmi. All rights reserved.
 * This file is part of the Whole Platform.
 *
 * The Whole Platform is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The Whole Platform is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
 */
package org.whole.lang.e4.ui.actions;

import static org.whole.lang.e4.ui.actions.IE4UIConstants.*;

import java.net.URL;

import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.jface.resource.ImageDescriptor;
import org.whole.lang.e4.ui.util.E4Utils;
import org.whole.lang.model.IEntity;
import org.whole.lang.ui.viewers.IEntityPartViewer;

/**
 * @author Enrico Persiani
 */
public class ClearContentsAction extends AbstractE4Action {
	public ClearContentsAction(IEclipseContext context) {
		super(context, CLEAR_CONTENTS_LABEL);
		try {
			setImageDescriptor(ImageDescriptor.createFromURL(new URL(CLEAR_CONTENTS_URI)));
		} catch (Exception e) {
		}
	}
	
	@Override
	public void run() {
		IEntityPartViewer viewer = getContext().get(IEntityPartViewer.class);
		viewer.setContents(null, createDefaultContents());
		update();
	}
	
	@Override
	public void update() {
		IEntityPartViewer viewer = getContext().get(IEntityPartViewer.class);
		setEnabled(viewer.hasContents());
	}

	protected IEntity createDefaultContents() {
		return E4Utils.createEmptyStatusContents();
	}
}