Source Code : Layout: Overlay Sample

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Layout: Overlay Sample

      
/*
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);
  }
}

           
         
    
    
    
    
    
  

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