Baseline and Leading

[Suhaas Mohandos]

If something is not baseline then does that mean it is leading? I am not clear about the difference between baseline and leading. I don't see any difference in the output between Baseline(Code 1) and Leading(Code 2) except for difference between the textbox sizes. So what is the difference between Baseline and Leading?

Baseline(Code 1):

import java.awt.Component;
import javax.swing.*;
import static javax.swing.GroupLayout.Alignment.*;

public class Find extends JFrame {
    public Find() {
        JLabel label = new JLabel("Find What:");;
        JTextField textField = new JTextField();
        JCheckBox caseCheckBox = new JCheckBox("Match Case");
        JCheckBox wrapCheckBox = new JCheckBox("Wrap Around");
        JCheckBox wholeCheckBox = new JCheckBox("Whole Words");
        JCheckBox backCheckBox = new JCheckBox("Search Backwards");
        JButton findButton = new JButton("Find");
        JButton cancelButton = new JButton("Cancel");

        // remove redundant default border of check boxes - they would hinder
        // correct spacing and aligning (maybe not needed on some look and feels)
        caseCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
        wrapCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
        wholeCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
        backCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

        GroupLayout layout = new GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setAutoCreateGaps(true);
        layout.setAutoCreateContainerGaps(true);        
                
        layout.setHorizontalGroup(layout.createSequentialGroup()
            .addComponent(label)
            .addGroup(layout.createParallelGroup(LEADING)
                .addComponent(textField))
               
            .addGroup(layout.createParallelGroup(LEADING)
                .addComponent(findButton))
        );
        
        layout.setVerticalGroup(layout.createSequentialGroup()
                .addComponent(label)
                .addGroup(layout.createParallelGroup(BASELINE)
                    .addComponent(textField))
                   
                .addGroup(layout.createParallelGroup(BASELINE)
                    .addComponent(findButton))        		
        );       
        setTitle("Find");
        pack();
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(
                                  "javax.swing.plaf.metal.MetalLookAndFeel");
                                //  "com.sun.java.swing.plaf.motif.MotifLookAndFeel");
                                //UIManager.getCrossPlatformLookAndFeelClassName());
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
                new Find().setVisible(true);
            }
        });
    }
}

Leading(Code 2):

import java.awt.Component;
import javax.swing.*;
import static javax.swing.GroupLayout.Alignment.*;

public class Find extends JFrame {
    public Find() {
        JLabel label = new JLabel("Find What:");;
        JTextField textField = new JTextField();
        JCheckBox caseCheckBox = new JCheckBox("Match Case");
        JCheckBox wrapCheckBox = new JCheckBox("Wrap Around");
        JCheckBox wholeCheckBox = new JCheckBox("Whole Words");
        JCheckBox backCheckBox = new JCheckBox("Search Backwards");
        JButton findButton = new JButton("Find");
        JButton cancelButton = new JButton("Cancel");

        // remove redundant default border of check boxes - they would hinder
        // correct spacing and aligning (maybe not needed on some look and feels)
        caseCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
        wrapCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
        wholeCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
        backCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

        GroupLayout layout = new GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setAutoCreateGaps(true);
        layout.setAutoCreateContainerGaps(true);        
                
        layout.setHorizontalGroup(layout.createSequentialGroup()
            .addComponent(label)
            .addGroup(layout.createParallelGroup(LEADING)
                .addComponent(textField))
               
            .addGroup(layout.createParallelGroup(LEADING)
                .addComponent(findButton))
        );
        
        layout.setVerticalGroup(layout.createSequentialGroup()
                .addComponent(label)
                .addGroup(layout.createParallelGroup(LEADING)
                    .addComponent(textField))
                   
                .addGroup(layout.createParallelGroup(LEADING)
                    .addComponent(findButton))        		
        );       
        setTitle("Find");
        pack();
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(
                                  "javax.swing.plaf.metal.MetalLookAndFeel");
                                //  "com.sun.java.swing.plaf.motif.MotifLookAndFeel");
                                //UIManager.getCrossPlatformLookAndFeelClassName());
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
                new Find().setVisible(true);
            }
        });
    }
}

[Tony Docherty]

The API docs explain what they do.
See http://docs.oracle.com/javase/6/docs/api/javax/swing/GroupLayout.Alignment.html#LEADING