ColorChooserTest.java Source code

Introduction

Here is the source code for ColorChooserTest.java

Source

/*
   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.Color;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 * @version 1.03 2007-06-12
 * @author Cay Horstmann
 */
public class ColorChooserTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                ColorChooserFrame frame = new ColorChooserFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

/**
 * A frame with a color chooser panel
 */
class ColorChooserFrame extends JFrame {
    public ColorChooserFrame() {
        setTitle("ColorChooserTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        // add color chooser panel to frame

        ColorChooserPanel panel = new ColorChooserPanel();
        add(panel);
    }

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

/**
 * A panel with buttons to pop up three types of color choosers
 */
class ColorChooserPanel extends JPanel {
    public ColorChooserPanel() {
        JButton modalButton = new JButton("Modal");
        modalButton.addActionListener(new ModalListener());
        add(modalButton);

        JButton modelessButton = new JButton("Modeless");
        modelessButton.addActionListener(new ModelessListener());
        add(modelessButton);

        JButton immediateButton = new JButton("Immediate");
        immediateButton.addActionListener(new ImmediateListener());
        add(immediateButton);
    }

    /**
     * This listener pops up a modal color chooser
     */
    private class ModalListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            Color defaultColor = getBackground();
            Color selected = JColorChooser.showDialog(ColorChooserPanel.this, "Set background", defaultColor);
            if (selected != null)
                setBackground(selected);
        }
    }

    /**
     * This listener pops up a modeless color chooser. The panel color is changed when the user
     * clicks the Ok button.
     */
    private class ModelessListener implements ActionListener {
        public ModelessListener() {
            chooser = new JColorChooser();
            dialog = JColorChooser.createDialog(ColorChooserPanel.this, "Background Color", false /* not modal */,
                    chooser, new ActionListener() // OK
                    // button
                    // listener
                    {
                        public void actionPerformed(ActionEvent event) {
                            setBackground(chooser.getColor());
                        }
                    }, null /* no Cancel button listener */);
        }

        public void actionPerformed(ActionEvent event) {
            chooser.setColor(getBackground());
            dialog.setVisible(true);
        }

        private JDialog dialog;
        private JColorChooser chooser;
    }

    /**
     * This listener pops up a modeless color chooser. The panel color is changed immediately when
     * the user picks a new color.
     */
    private class ImmediateListener implements ActionListener {
        public ImmediateListener() {
            chooser = new JColorChooser();
            chooser.getSelectionModel().addChangeListener(new ChangeListener() {
                public void stateChanged(ChangeEvent event) {
                    setBackground(chooser.getColor());
                }
            });

            dialog = new JDialog((Frame) null, false /* not modal */);
            dialog.add(chooser);
            dialog.pack();
        }

        public void actionPerformed(ActionEvent event) {
            chooser.setColor(getBackground());
            dialog.setVisible(true);
        }

        private JDialog dialog;
        private JColorChooser chooser;
    }
}