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.
(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();
}
}
}
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