GroupLayoutTest.java Source code

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Here is the source code for GroupLayoutTest.java

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/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)
    
   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
   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, 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();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

/**
 * A frame that uses a group layout to arrange font selection components.
 */
class FontFrame extends JFrame {
    public FontFrame() {
        setTitle("GroupLayoutTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        ActionListener listener = new FontAction();

        // construct components

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

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

        face.addActionListener(listener);

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

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

        size.addActionListener(listener);

        bold = new JCheckBox("Bold");
        bold.addActionListener(listener);

        italic = new JCheckBox("Italic");
        italic.addActionListener(listener);

        sample = new JTextArea();
        sample.setText("The quick brown fox jumps over the lazy dog");
        sample.setEditable(false);
        sample.setLineWrap(true);
        sample.setBorder(BorderFactory.createEtchedBorder());

        pane = new JScrollPane(sample);

        GroupLayout layout = new GroupLayout(getContentPane());
        setLayout(layout);
        layout.setHorizontalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup().addContainerGap()
                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                                .addGroup(GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING)
                                                .addComponent(faceLabel).addComponent(sizeLabel))
                                        .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                        .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING, false)
                                                .addComponent(size).addComponent(face)))
                                .addComponent(italic).addComponent(bold))
                        .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED).addComponent(pane)
                        .addContainerGap()));

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

        layout.setVerticalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING).addGroup(layout
                .createSequentialGroup().addContainerGap()
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                        .addComponent(pane, GroupLayout.Alignment.TRAILING)
                        .addGroup(layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                                        .addComponent(face).addComponent(faceLabel))
                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                                        .addComponent(size).addComponent(sizeLabel))
                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(italic, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE,
                                        Short.MAX_VALUE)
                                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED).addComponent(bold,
                                        GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                .addContainerGap()));
    }

    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);
            sample.setFont(font);
            sample.repaint();
        }
    }
}