SyntaxPanel.java

/**
 * eAdventure (formerly <e-Adventure> and <e-Game>) is a research project of the
 *    <e-UCM> research group.
 *
 *    Copyright 2005-2010 <e-UCM> research group.
 *
 *    You can access a list of all the contributors to eAdventure at:
 *          http://e-adventure.e-ucm.es/contributors
 *
 *    <e-UCM> is a research group of the Department of Software Engineering
 *          and Artificial Intelligence at the Complutense University of Madrid
 *          (School of Computer Science).
 *
 *          C Profesor Jose Garcia Santesmases sn,
 *          28040 Madrid (Madrid), Spain.
 *
 *          For more info please visit:  <http://e-adventure.e-ucm.es> or
 *          <http://www.e-ucm.es>
 *
 * ****************************************************************************
 *
 *  This file is part of eAdventure, version 2.0
 *
 *      eAdventure 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.
 *
 *      eAdventure 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 eAdventure.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * To change this license header, choose License Headers in Project Properties.
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package es.eucm.ead.editor.view.components;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.JComponent;
import javax.swing.JPanel;
import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
import org.fife.ui.rsyntaxtextarea.TokenTypes;
import org.fife.ui.rtextarea.RTextScrollPane;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A panel where source-code can be displayed and edited.
 * 
 * @author mfreire
 */
public class SyntaxPanel extends JPanel {

	static private Logger logger = LoggerFactory.getLogger(SyntaxPanel.class);

	protected RSyntaxTextArea textArea;
	protected RTextScrollPane scrollPane;

	private ComponentAdapter previousAdapter;
	private JComponent previousReference;

	public SyntaxPanel(String syntaxStyle) {
		textArea = new RSyntaxTextArea();
		textArea.setSyntaxEditingStyle(syntaxStyle);
		textArea.setCodeFoldingEnabled(true);
		textArea.setAntiAliasingEnabled(true);
		scrollPane = new RTextScrollPane(textArea);
		scrollPane.setFoldIndicatorEnabled(true);

		setLayout(new BorderLayout());
		add(scrollPane, BorderLayout.CENTER);
	}

	public String getText() {
		return textArea.getText();
	}

	public void setText(String text) {
		textArea.setText(text);
	}

	public final void setReferenceComponent(final JComponent c, final int mx) {
		if (c != previousReference) {
			if (previousReference != null) {
				previousReference.removeComponentListener(previousAdapter);
			}
			previousReference = c;
			ComponentAdapter nextAdapter = new ComponentAdapter() {
				private boolean isUpdating = false;
				private final Dimension oldSize = new Dimension(0, 0);

				@Override
				public void componentResized(ComponentEvent e) {
					if (oldSize.equals(c.getSize())) {
						return;
					} else {
						oldSize.setSize(c.getSize());
					}

					if (isVisible() && !isUpdating) {
						isUpdating = true;
						FontMetrics fm = textArea
								.getFontMetricsForTokenType(TokenTypes.WHITESPACE);
						int w = c.getWidth() - mx;
						int h = c.getHeight();
						int fw = fm.getMaxAdvance();
						int cols = w / fw;
						logger
								.debug(
										"resized {} to {}x{}, @ {}x?, yielding {} cols",
										hashCode(), "" + w, "" + h, "" + fw, ""
												+ cols);
						textArea.setColumns(cols);
					} else {
						logger.debug("avoided resizing {}", hashCode());
					}
					isUpdating = false;
				}

			};
			c.addComponentListener(nextAdapter);
			previousAdapter = nextAdapter;
		}
	}
}