ActionTest.java Source code

Introduction

Here is the source code for ActionTest.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.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;

/**
 * @version 1.33 2007-06-12
 * @author Cay Horstmann
 */
public class ActionTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                ActionFrame frame = new ActionFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

/**
 * A frame with a panel that demonstrates color change actions.
 */
class ActionFrame extends JFrame {
    public ActionFrame() {
        setTitle("ActionTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        buttonPanel = new JPanel();

        // define actions
        Action yellowAction = new ColorAction("Yellow", new ImageIcon("yellow-ball.gif"), Color.YELLOW);
        Action blueAction = new ColorAction("Blue", new ImageIcon("blue-ball.gif"), Color.BLUE);
        Action redAction = new ColorAction("Red", new ImageIcon("red-ball.gif"), Color.RED);

        // add buttons for these actions
        buttonPanel.add(new JButton(yellowAction));
        buttonPanel.add(new JButton(blueAction));
        buttonPanel.add(new JButton(redAction));

        // add panel to frame
        add(buttonPanel);

        // associate the Y, B, and R keys with names
        InputMap imap = buttonPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
        imap.put(KeyStroke.getKeyStroke("ctrl Y"), "panel.yellow");
        imap.put(KeyStroke.getKeyStroke("ctrl B"), "panel.blue");
        imap.put(KeyStroke.getKeyStroke("ctrl R"), "panel.red");

        // associate the names with actions
        ActionMap amap = buttonPanel.getActionMap();
        amap.put("panel.yellow", yellowAction);
        amap.put("panel.blue", blueAction);
        amap.put("panel.red", redAction);
    }

    public class ColorAction extends AbstractAction {
        /**
         * Constructs a color action.
         * @param name the name to show on the button
         * @param icon the icon to display on the button
         * @param c the background color
         */
        public ColorAction(String name, Icon icon, Color c) {
            putValue(Action.NAME, name);
            putValue(Action.SMALL_ICON, icon);
            putValue(Action.SHORT_DESCRIPTION, "Set panel color to " + name.toLowerCase());
            putValue("color", c);
        }

        public void actionPerformed(ActionEvent event) {
            Color c = (Color) getValue("color");
            buttonPanel.setBackground(c);
        }
    }

    private JPanel buttonPanel;

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