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RText is a powerful, cross-platform programmer's text editor written in Java. It is designed to be easy to use, highly customizable and flexible. Part of RText's design is for the source code to be simple, easy to understand, and well documented, so that other programmers can look into its inner-workings and figure out how RText ticks with ease. A good place to start (besides the source code) is the Javadoc for all classes used in the project.

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/*
 * 11/14/2003
 *
 * GoToAction.java - Action to "goto" a specific line number in RText.
 * Copyright (C) 2003 Robert Futrell
 * robert_futrell at users.sourceforge.net
 * http://rtext.fifesoft.com
 *
 * This file is a part of RText.
 *
 * RText is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * RText 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package org.fife.rtext.actions;

import java.awt.event.ActionEvent;
import java.util.ResourceBundle;
import javax.swing.Icon;
import javax.swing.JOptionPane;
import javax.swing.text.BadLocationException;

import org.fife.rtext.AbstractMainView;
import org.fife.rtext.GoToDialog;
import org.fife.rtext.RText;
import org.fife.rtext.RTextEditorPane;
import org.fife.ui.app.StandardAction;


/**
 * Action used by an AbstractMainView to "goto" a specific line
 * number in the current document.
 *
 * @author Robert Futrell
 * @version 1.0
 */
class GoToAction extends StandardAction {


	/**
	 * Constructor.
	 *
	 * @param owner The parent RText instance.
	 * @param msg The resource bundle to use for localization.
	 * @param icon The icon associated with the action.
	 */
	public GoToAction(RText owner, ResourceBundle msg, Icon icon) {
		super(owner, msg, "GoToAction");
		setIcon(icon);
	}


	public void actionPerformed(ActionEvent e) {

		RText rtext = (RText)getApplication();
		AbstractMainView mainView = rtext.getMainView();

		// Initializing the dialog now saves on load time when we first bring rtext up.
		if (mainView.goToDialog==null)
			mainView.goToDialog = new GoToDialog(rtext, mainView);

		// Prepare and show the GoTo Line dialog.
		RTextEditorPane editor = mainView.getCurrentTextArea();
		mainView.goToDialog.setMaxLineNumberAllowed(editor.getLineCount());
		mainView.goToDialog.setVisible(true);

		// If a real line number is returned, go to that line number.
		int line = mainView.goToDialog.getLineNumber();
		if (line>0) {

			try {
				editor.setCaretPosition(editor.getLineStartOffset(line-1));
			} catch (BadLocationException ble) {
				String temp = rtext.getString("InternalErrorILN",
									Integer.toString(line));
				JOptionPane.showMessageDialog(rtext, temp,
									rtext.getString("ErrorDialogTitle"),
									JOptionPane.ERROR_MESSAGE);
			}

		}

	}


}