A frame that uses a group layout to arrange font selection components : Layout « Swing JFC « Java

A frame that uses a group layout to arrange font selection components

   This program is a part of the companion code for Core Java 8th ed.

   This program 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 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   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, see <http://www.gnu.org/licenses/>.

import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.GroupLayout;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.LayoutStyle;
import javax.swing.SwingConstants;

 * @version 1.0 2007-04-27
 * @author Cay Horstmann
public class GroupLayoutTest
   public static void main(String[] args)
      EventQueue.invokeLater(new Runnable()
            public void run()
               FontFrame frame = new FontFrame();

 * A frame that uses a group layout to arrange font selection components.
class FontFrame extends JFrame
   public FontFrame()

      ActionListener listener = new FontAction();

      // construct components

      JLabel faceLabel = new JLabel("Face: ");

      face = new JComboBox(new String[] { "Serif", "SansSerif", "Monospaced", "Dialog",
            "DialogInput" });


      JLabel sizeLabel = new JLabel("Size: ");

      size = new JComboBox(new String[] { "8", "10", "12", "15", "18", "24", "36", "48" });


      bold = new JCheckBox("Bold");

      italic = new JCheckBox("Italic");

      sample = new JTextArea();
      sample.setText("The quick brown fox jumps over the lazy dog");

      pane = new JScrollPane(sample);

      GroupLayout layout = new GroupLayout(getContentPane());
                                                GroupLayout.Alignment.LEADING, false)

      layout.linkSize(SwingConstants.HORIZONTAL, new java.awt.Component[] { face, size });

                              pane, GroupLayout.Alignment.TRAILING).addGroup(
                                          italic, GroupLayout.DEFAULT_SIZE,
                                          GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                    .addComponent(bold, GroupLayout.DEFAULT_SIZE,
                                          GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))

   public static final int DEFAULT_WIDTH = 300;
   public static final int DEFAULT_HEIGHT = 200;

   private JComboBox face;
   private JComboBox size;
   private JCheckBox bold;
   private JCheckBox italic;
   private JScrollPane pane;
   private JTextArea sample;

    * An action listener that changes the font of the sample text.
   private class FontAction implements ActionListener
      public void actionPerformed(ActionEvent event)
         String fontFace = (String) face.getSelectedItem();
         int fontStyle = (bold.isSelected() ? Font.BOLD : 0)
               + (italic.isSelected() ? Font.ITALIC : 0);
         int fontSize = Integer.parseInt((String) size.getSelectedItem());
         Font font = new Font(fontFace, fontStyle, fontSize);


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