Components aren't layed out correctly using BoyLayout

Have a look at here...

http://java.sun.com/docs/books/tutorial/uiswing/layout/box.html

traceGroupJumperList.setListData(v);

// insert the following line after the above line....
traceGroupJumperList.setAlignmentX(JComponent.LEFT_ALIGNMENT);



Regards,
Muruga

Sorry. I played around with the XXX_ALIGNMENT.

What I mean is that when I insert this line:
traceGroupJumperList.setAlignmentX(JComponent.LEFT_ALIGNMENT);

The two JBUttons are not aligned at the left side of the panel but seems to have an indent of approximately 10 pixel and I don't know why. When I remove the JList, the JButtons are aligned properly.

The Java tutorial doesn't help in this case. I read this chapter previously.

So what is the problem now

The problem is that not all components are aligned at the left side of the panel.
When I add the two JButtons only to the pane everything is fine.
when I then add the JList to the pane, the JList is aligned well on the left side of the panel but the JButtons are not any longer. There is now a gap between the left side of the panel and the left side of the JButtons.

For me, the alignment is exactly at the edge of the panel.  Both button and Jlist.

Weird!
There must be something wrong in the rest of my program's code. I guess nobody of you good guys can help me then.
Of course, I would expect a behaviour like your program has with the code above.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.*;

public class BoxLayoutTest extends JFrame
{
      private JPanel statusPane;
      private JSplitPane splitPane;
      private JList traceGroupJumperList;
      private JPanel topPane = new JPanel(), mainPane = new JPanel(), leftNavPane = new JPanel();
      private JProgressBar fileloadProgressbar;
      private JLabel fileloadProgresslabel;
      private JComboBox groupCriterionChooser;
      private JButton openFileButton;
      
      public BoxLayoutTest()
      {
            super();
            
            initGuiComponents();
      }
      
      private void initGuiComponents()
      {
            //The layout of the application itself.
            getContentPane().setLayout(new BorderLayout());

            //NORTH components
            openFileButton = new JButton("Open file");

            groupCriterionChooser = new JComboBox();

            fileloadProgresslabel = new JLabel("Progress bar");
            fileloadProgressbar = new JProgressBar();
            fileloadProgressbar.setStringPainted(true);

            topPane.setLayout(new FlowLayout(FlowLayout.LEADING));
            topPane.add(openFileButton);
            topPane.add(fileloadProgresslabel);
            topPane.add(fileloadProgressbar);
            this.getContentPane().add(topPane, BorderLayout.PAGE_START);

            //CENTER components
            JScrollPane mainScrollPane = new JScrollPane(mainPane);
            {
                  //RIGHT JSplitPane components
                  BoxLayout bl = new BoxLayout(mainPane, BoxLayout.PAGE_AXIS);
                  mainPane.setLayout(bl);
                  mainPane.setBackground(Color.orange);

                  //LEFT JSplitPane components
                  leftNavPane.setLayout(new BoxLayout(leftNavPane, BoxLayout.PAGE_AXIS));
                  leftNavPane.setBorder(BorderFactory.createEmptyBorder(10, 0, 10, 10));
                  leftNavPane.setBackground(Color.green);

                  JButton b1 = new JButton("111");
                  b1.setAlignmentX(LEFT_ALIGNMENT);
                  leftNavPane.add(b1);
                  leftNavPane.add(Box.createRigidArea(new Dimension(0, 5)));
                  JButton b2 = new JButton("222");
                  b2.setAlignmentX(LEFT_ALIGNMENT);
                  leftNavPane.add(b2);
                  leftNavPane.add(Box.createRigidArea(new Dimension(0, 5)));
                  traceGroupJumperList = new JList();
                  traceGroupJumperList.setAlignmentY(RIGHT_ALIGNMENT);
                  leftNavPane.add(traceGroupJumperList);
                  traceGroupJumperList.add(new JLabel("cc"));
                  
                  //b1.setBounds(b1.getX(), b1.getY(), 80, 25);
                  //b2.setBounds(b2.getX(), b2.getY(), 80, 25);
                  
                  java.util.Vector v = new java.util.Vector();
                  v.add(new String("aaa"));
                  v.add(new String("zzz"));
                  traceGroupJumperList.setListData(v);
                  traceGroupJumperList.setAlignmentX(JComponent.LEFT_ALIGNMENT);
                  
                  traceGroupJumperList.revalidate();
                  traceGroupJumperList.repaint();

                  /*
                  leftNavPane.setLayout(new BoxLayout(leftNavPane, BoxLayout.PAGE_AXIS));
                  leftNavPane.setAlignmentY(leftNavPane.LEFT_ALIGNMENT);
                  leftNavPane.setBorder(BorderFactory.createEmptyBorder(10,0,10,10));
                  java.util.Vector v = new java.util.Vector();
                  v.add(new String("aaa"));
                  v.add(new String("zzz"));
                  traceGroupJumperList = new JList(v);
                  traceGroupJumperList.setAlignmentY(this.LEFT_ALIGNMENT);
                  JButton b3 = new JButton("33333");
                  b3.setAlignmentY(LEFT_ALIGNMENT);
                  b3.setBackground(Color.green);
                  leftNavPane.add(b3);
                  leftNavPane.add(Box.createRigidArea(new Dimension(1, 10)));
                  leftNavPane.add(traceGroupJumperList);
                  leftNavPane.add(Box.createRigidArea(new Dimension(1, 10)));
                  JButton b4 = new JButton("44444");
                  b4.setAlignmentY(RIGHT_ALIGNMENT);
                  leftNavPane.add(b4);
                  */
            }
            splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftNavPane, mainScrollPane);

            //SOUTH components
            statusPane = new JPanel();

            //Putting it altogether
            this.getContentPane().add(statusPane, BorderLayout.SOUTH);
            this.getContentPane().add(splitPane, BorderLayout.CENTER);

            setSize(300,300);
            setVisible(true);
            
            //addListeners();
      } //end initGuiComponents
      //----------------------------------------------------------------------------

      public static void main(String[] args)
      {
            new BoxLayoutTest();
      }
}


Try this code....

No effect. What did you change?
When I print out the bounds of the relevant components I get these values:

JButton b1 = java.awt.Rectangle[x=11,y=10,width=55,height=26]

JButton b2 = java.awt.Rectangle[x=11,y=41,width=55,height=26]

JList traceGroupJumperList = java.awt.Rectangle[x=0,y=72,width=23,height=36]

I reported this as a bug to JavaSoft. Maybe they can find out if it's really a bug.

Okie.  Then you can close/delete this question.


Regards,
Muruga