Using CheckBox ActionListener to controll font
/*
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.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
* @version 1.33 2007-06-12
* @author Cay Horstmann
*/
public class CheckBoxTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
CheckBoxFrame frame = new CheckBoxFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* A frame with a sample text label and check boxes for selecting font attributes.
*/
class CheckBoxFrame extends JFrame
{
public CheckBoxFrame()
{
setTitle("CheckBoxTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// add the sample text label
label = new JLabel("The quick brown fox jumps over the lazy dog.");
label.setFont(new Font("Serif", Font.PLAIN, FONTSIZE));
add(label, BorderLayout.CENTER);
// this listener sets the font attribute of
// the label to the check box state
ActionListener listener = new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
int mode = 0;
if (bold.isSelected()) mode += Font.BOLD;
if (italic.isSelected()) mode += Font.ITALIC;
label.setFont(new Font("Serif", mode, FONTSIZE));
}
};
// add the check boxes
JPanel buttonPanel = new JPanel();
bold = new JCheckBox("Bold");
bold.addActionListener(listener);
buttonPanel.add(bold);
italic = new JCheckBox("Italic");
italic.addActionListener(listener);
buttonPanel.add(italic);
add(buttonPanel, BorderLayout.SOUTH);
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 200;
private JLabel label;
private JCheckBox bold;
private JCheckBox italic;
private static final int FONTSIZE = 12;
}
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