Source Code : BoxLayout: setAlignmentX setAlignmentY

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BoxLayout: setAlignmentX setAlignmentY

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

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.util.Enumeration;
import java.util.Vector;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class BoxSample {
  public static void main(String args[]) {
    JButton button;
    Vector buttons = new Vector();
    Dimension dim;
    JFrame frame = new JFrame("Box Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Container contentPane = frame.getContentPane();
    contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.X_AXIS));
    JPanel topLeft = new JPanel();
    topLeft.setLayout(new BoxLayout(topLeft, BoxLayout.X_AXIS));
    topLeft.add(button = new JButton("One"));
    buttons.add(button);
    changeBoth(button);
    topLeft.add(button = new JButton("Two"));
    buttons.add(button);
    changeBoth(button);
    changeWidth(topLeft);
    JPanel bottomLeft = new JPanel();
    bottomLeft.setLayout(new BoxLayout(bottomLeft, BoxLayout.X_AXIS));
    bottomLeft.add(button = new JButton("Six"));
    buttons.add(button);
    changeBoth(button);
    bottomLeft.add(button = new JButton("Seven"));
    buttons.add(button);
    changeBoth(button);
    changeWidth(bottomLeft);
    JPanel left = new JPanel();
    left.setLayout(new BoxLayout(left, BoxLayout.Y_AXIS));
    left.add(topLeft);
    left.add(button = new JButton("Four"));
    buttons.add(button);
    changeBoth(button);
    left.add(bottomLeft);
    changeBoth(left);

    JPanel right = new JPanel();
    right.setLayout(new BoxLayout(right, BoxLayout.Y_AXIS));
    right.add(button = new JButton("Three"));
    buttons.add(button);
    changeWidth(button);
    right.add(button = new JButton("Five"));
    buttons.add(button);
    changeBoth(button);
    changeBoth(right);
    contentPane.add(left);
    contentPane.add(right);
    tweak(buttons);
    frame.pack();
    frame.setVisible(true);
  }

  private static void changeWidth(JComponent comp) {
    comp.setAlignmentX(Component.CENTER_ALIGNMENT);
    comp.setAlignmentY(Component.CENTER_ALIGNMENT);
    Dimension dim = comp.getPreferredSize();
    dim.width = Integer.MAX_VALUE;
    comp.setMaximumSize(dim);
  }

  private static void changeHeight(JComponent comp) {
    comp.setAlignmentX(Component.CENTER_ALIGNMENT);
    comp.setAlignmentY(Component.CENTER_ALIGNMENT);
    Dimension dim = comp.getPreferredSize();
    dim.height = Integer.MAX_VALUE;
    comp.setMaximumSize(dim);
  }

  private static void changeBoth(JComponent comp) {
    comp.setAlignmentX(Component.CENTER_ALIGNMENT);
    comp.setAlignmentY(Component.CENTER_ALIGNMENT);
    Dimension dim = new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
    comp.setMaximumSize(dim);
  }

  private static void tweak(Vector buttons) {
    // calc max preferred width
    JButton button;
    Dimension dim;
    int maxWidth = 0;
    Enumeration e = buttons.elements();
    while (e.hasMoreElements()) {
      button = (JButton) e.nextElement();
      dim = button.getPreferredSize();
      if (dim.width > maxWidth)
        maxWidth = dim.width;
    }
    // set max preferred width
    e = buttons.elements();
    while (e.hasMoreElements()) {
      button = (JButton) e.nextElement();
      dim = button.getPreferredSize();
      dim.width = maxWidth;
      button.setPreferredSize(dim);
    }
  }
}

           
         
    
    
    
    
    
  

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