samer@1: import java.awt.*;
samer@1: import java.awt.event.*;
samer@1: import javax.swing.*;
samer@1: 
samer@1: public class BoxLayoutDemo {
samer@1:     protected static int NUM_COMPONENTS = 3;
samer@1:     protected static float[] xAlignment = {Component.LEFT_ALIGNMENT,
samer@1:                                  Component.CENTER_ALIGNMENT,
samer@1:                                  Component.RIGHT_ALIGNMENT};
samer@1:     protected static float[] hue = {0.0f, 0.33f, 0.67f};
samer@1:     protected static boolean restrictSize = true;
samer@1:     protected static boolean sizeIsRandom = false;
samer@1:     protected static BLDComponent[] bldComponent = 
samer@1:         new BLDComponent[NUM_COMPONENTS];
samer@1: 
samer@1:     public static void main(String[] args) {
samer@1:         final JPanel panel = new JPanel();
samer@1:         panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
samer@1: 
samer@1:         //Create the rectangles.
samer@1:         int shortSideSize = 15;
samer@1:         for (int i = 0; i < NUM_COMPONENTS; i++) {
samer@1:             if (sizeIsRandom) {
samer@1:                 shortSideSize = (int)(30.0 * Math.random()) + 30;
samer@1:             } else {
samer@1:                 shortSideSize += 10;
samer@1:             }
samer@1:             bldComponent[i] = new BLDComponent(xAlignment[i], hue[i], 
samer@1:                                              shortSideSize, 
samer@1:                                              restrictSize,
samer@1:                                              sizeIsRandom,
samer@1:                                              String.valueOf(i));
samer@1:             panel.add(bldComponent[i]);
samer@1:         }
samer@1: 
samer@1:         //Create the instructions.
samer@1:         JLabel label = new JLabel("Click a rectangle to "
samer@1:                                 + "change its X alignment.");
samer@1:         JCheckBox cb = new JCheckBox("Restrict maximum rectangle size.");
samer@1:         cb.setSelected(restrictSize);
samer@1:         cb.addItemListener(new ItemListener() {
samer@1:             public void itemStateChanged(ItemEvent e) {
samer@1:                 if (e.getStateChange() == ItemEvent.SELECTED) {
samer@1:                     restrictSize = true;
samer@1:                 } else {
samer@1:                     restrictSize = false;
samer@1:                 }
samer@1:                 notifyBLDComponents();
samer@1:             }
samer@1:         });
samer@1: 
samer@1:         JFrame f = new JFrame("BoxLayoutDemo");
samer@1:         Container contentPane = f.getContentPane();
samer@1:         contentPane.add(panel, BorderLayout.CENTER);
samer@1:         panel.setBorder(BorderFactory.createLineBorder(Color.red));
samer@1: 
samer@1:         Box box = Box.createVerticalBox();
samer@1:         box.add(label);
samer@1:         box.add(cb);
samer@1: 
samer@1:         contentPane.add(box, BorderLayout.SOUTH);
samer@1:         f.addWindowListener(new WindowAdapter() {
samer@1:             public void windowClosing(WindowEvent e) {
samer@1:                 System.exit(0);
samer@1:             }
samer@1:         });
samer@1:         f.pack();
samer@1:         f.setVisible(true);
samer@1:     }
samer@1: 
samer@1:     static public void notifyBLDComponents() {
samer@1:         for (int i = 0; i < NUM_COMPONENTS; i++) {
samer@1:             bldComponent[i].setSizeRestriction(restrictSize);
samer@1:         }
samer@1:         bldComponent[0].revalidate();
samer@1:     }
samer@1: }