SimpleLineStylePage.java

/*
 * Copyright (c) 2012 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available 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.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */
package eu.esdihumboldt.hale.ui.style.dialog;

import org.eclipse.jface.dialogs.IDialogPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Composite;
import org.geotools.styling.LineSymbolizer;
import org.geotools.styling.SLD;
import org.geotools.styling.Style;
import org.geotools.styling.StyleBuilder;
import org.geotools.styling.Symbolizer;

import eu.esdihumboldt.hale.ui.style.editors.LineSymbolizerEditor;
import eu.esdihumboldt.hale.ui.style.internal.Messages;

/**
 * Line style editor
 * 
 * @author Simon Templer
 * @partner 01 / Fraunhofer Institute for Computer Graphics Research
 */
public class SimpleLineStylePage extends FeatureStylePage {

	private final StyleBuilder styleBuilder = new StyleBuilder();

	private LineSymbolizerEditor lineEditor;

	/**
	 * @param parent the parent dialog
	 */
	public SimpleLineStylePage(FeatureStyleDialog parent) {
		super(parent, Messages.SimpleLineStylePage_SuperTitle);
	}

	/**
	 * @see FeatureStylePage#getStyle(boolean)
	 */
	@Override
	public Style getStyle(boolean force) throws Exception {
		if (lineEditor != null) {
			if (force || lineEditor.isChanged()) {
				return styleBuilder.createStyle(lineEditor.getValue());
			}
			else {
				// nothing has changed
				return null;
			}
		}

		return null;
	}

	/**
	 * @see IDialogPage#createControl(Composite)
	 */
	@Override
	public void createControl(Composite parent) {
		// create new controls
		Composite page = new Composite(parent, SWT.NONE);

		RowLayout layout = new RowLayout(SWT.HORIZONTAL);
		page.setLayout(layout);

		Style style = getParent().getStyle();
		LineSymbolizer line = null;
		try {
			Symbolizer[] symbolizers = SLD.symbolizers(style);
			for (Symbolizer symbol : symbolizers) {
				if (symbol instanceof LineSymbolizer) {
					line = (LineSymbolizer) symbol;
					break;
				}
			}
		} catch (Exception e) {
			// ignore
		}

		if (line == null) {
			line = styleBuilder.createLineSymbolizer();
		}

		lineEditor = new LineSymbolizerEditor(page, line);

		setControl(page);
	}

}