OverlaySample.java Source code

Introduction

Here is the source code for OverlaySample.java

Source

/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski       
ISBN: 1-893115-78-X
Publisher: APress
*/

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.OverlayLayout;

public class OverlaySample {
    public static final String SET_MINIMUM = "Minimum";

    public static final String SET_MAXIMUM = "Maximum";

    public static final String SET_CENTRAL = "Central";

    public static final String SET_MIXED = "Mixed";

    static JButton smallButton = new JButton();

    static JButton mediumButton = new JButton();

    static JButton largeButton = new JButton();

    public static void setupButtons(String command) {
        if (SET_MINIMUM.equals(command)) {
            smallButton.setAlignmentX(0.0f);
            smallButton.setAlignmentY(0.0f);
            mediumButton.setAlignmentX(0.0f);
            mediumButton.setAlignmentY(0.0f);
            largeButton.setAlignmentX(0.0f);
            largeButton.setAlignmentY(0.0f);
        } else if (SET_MAXIMUM.equals(command)) {
            smallButton.setAlignmentX(1.0f);
            smallButton.setAlignmentY(1.0f);
            mediumButton.setAlignmentX(1.0f);
            mediumButton.setAlignmentY(1.0f);
            largeButton.setAlignmentX(1.0f);
            largeButton.setAlignmentY(1.0f);
        } else if (SET_CENTRAL.equals(command)) {
            smallButton.setAlignmentX(0.5f);
            smallButton.setAlignmentY(0.5f);
            mediumButton.setAlignmentX(0.5f);
            mediumButton.setAlignmentY(0.5f);
            largeButton.setAlignmentX(0.5f);
            largeButton.setAlignmentY(0.5f);
        } else if (SET_MIXED.equals(command)) {
            smallButton.setAlignmentX(0.0f);
            smallButton.setAlignmentY(0.0f);
            mediumButton.setAlignmentX(0.5f);
            mediumButton.setAlignmentY(0.5f);
            largeButton.setAlignmentX(1.0f);
            largeButton.setAlignmentY(1.0f);
        } else {
            throw new IllegalArgumentException("Illegal Command: " + command);
        }
        // Redraw panel
        ((JPanel) largeButton.getParent()).revalidate();
    }

    public static void main(String args[]) {

        ActionListener generalActionListener = new ActionListener() {
            public void actionPerformed(ActionEvent actionEvent) {
                JComponent comp = (JComponent) actionEvent.getSource();
                System.out.println(actionEvent.getActionCommand() + ": " + comp.getBounds());
            }
        };

        ActionListener sizingActionListener = new ActionListener() {
            public void actionPerformed(ActionEvent actionEvent) {
                setupButtons(actionEvent.getActionCommand());
            }
        };

        JFrame frame = new JFrame("Overlay Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        LayoutManager overlay = new OverlayLayout(panel);
        panel.setLayout(overlay);

        Object settings[][] = { { "Small", new Dimension(25, 25), Color.white },
                { "Medium", new Dimension(50, 50), Color.gray },
                { "Large", new Dimension(100, 100), Color.black } };
        JButton buttons[] = { smallButton, mediumButton, largeButton };

        for (int i = 0, n = settings.length; i < n; i++) {
            JButton button = buttons[i];
            button.addActionListener(generalActionListener);
            button.setActionCommand((String) settings[i][0]);
            button.setMaximumSize((Dimension) settings[i][1]);
            button.setBackground((Color) settings[i][2]);
            panel.add(button);
        }

        setupButtons(SET_CENTRAL);

        JPanel actionPanel = new JPanel();
        actionPanel.setBorder(BorderFactory.createTitledBorder("Change Alignment"));
        String actionSettings[] = { SET_MINIMUM, SET_MAXIMUM, SET_CENTRAL, SET_MIXED };
        for (int i = 0, n = actionSettings.length; i < n; i++) {
            JButton button = new JButton(actionSettings[i]);
            button.addActionListener(sizingActionListener);
            actionPanel.add(button);
        }

        Container contentPane = frame.getContentPane();
        contentPane.add(panel, BorderLayout.CENTER);
        contentPane.add(actionPanel, BorderLayout.SOUTH);

        frame.setSize(400, 300);
        frame.setVisible(true);
    }
}