ConsoleTest.java example

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jnode-master
/*
 * $Id$
 *
 * Copyright (C) 2003-2015 JNode.org
 *
 * This library 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 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 this library; If not, write to the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
package org.jnode.test.gui;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTextArea;

/**
 * @author Ewout Prangsma (epr@users.sourceforge.net)
 */
public class ConsoleTest {

    @SuppressWarnings("serial")
    static class ConsoleFrame extends JFrame {
        private PrintStream savedOut;
        private JTextArea textArea;

        public ConsoleFrame() {
            super("System.out");
            textArea = new JTextArea("System.out:");
            getContentPane().setLayout(new BorderLayout());
            getContentPane().add(textArea, BorderLayout.CENTER);
            savedOut = new PrintStream(new TextAreaOutputStream(textArea));
            setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        }

        public void setVisible(boolean b) {
            super.setVisible(b);
            if (b) {
                claimPrintStreams();
            }
        }

        private void claimPrintStreams() {
            System.out.println("Claiming print streams.");
            AccessController.doPrivileged(new PrivilegedAction<Void>() {
                public Void run() {
                    System.setOut(savedOut);
                    System.setErr(savedOut);
                    return null;
                }
            });
            System.out.println("Claimed print streams.");
        }
    }


    public static void main(String[] args) {
        try {
            final ConsoleFrame frame = new ConsoleFrame();
            frame.getRootPane().setDoubleBuffered(false);
            frame.setLocation(100, 100);
            frame.setSize(400, 400);
            JButton button = new JButton("Button");
            button.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent event) {
                    System.out.println("Button pressed.");
                }
            });
            frame.getContentPane().add(button, BorderLayout.SOUTH);
            JMenuBar mb = new JMenuBar();
            JMenu menu = new JMenu("JMenu test");
            JMenuItem mi = new JMenuItem("JMenuItem test");
            mb.add(menu);
            menu.add(mi);
            frame.setJMenuBar(mb);
            frame.validate();
            frame.setVisible(true);

//            int count=0;
//            Timer t=new Timer( 1000,new ActionListener() {
//                public void actionPerformed( ActionEvent event ) {
//                    System.out.println( "X" );
//                }
//            } );
//            t.start();
//            comp.requestFocus();
            System.out.println("Showed ConsoleTest frame.");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * @author epr
     * @author Levente S\u00e1ntha (lsantha@users.sourceforge.net)
     */
    public static class TextAreaOutputStream extends OutputStream {

        private JTextArea textArea;

        public TextAreaOutputStream(JTextArea console) {
            this.textArea = console;
        }

        public void write(int b) throws IOException {
            textArea.append("" + (char) b);
            if (b == '\n') {
                textArea.repaint();
            }
        }
    }

}