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Groups > comp.lang.java.gui > #4387

Re: Sharing ListSelection

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  To: comp.lang.java.gui
John B. Matthews wrote:
> perhaps something like this might work:

A couple of things concern me about this code.

> <code>
> import java.awt.*;
> import java.awt.event.*;
> import javax.swing.*;
> import javax.swing.event.*;
> 
> public class SR extends JFrame {

SR extends JFrame, but is nowhere used.

Inheritance?  Composition?

>   private static boolean useLast = false;

nit:  the second initialization to 'false' is redundant, as 'false' is the 
default value.

>   private static int lastIndex;
> 
>   public static void main(String[] args) {
>     final JFrame frame = new JFrame();

Not inheritance?

More important: this is not on the EDT.

>     frame.setLayout(new BorderLayout());
>     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
> 
>     final JList list1 = new JList();
>     final JList list2 = new JList();
> 
>     final DefaultListModel model = new DefaultListModel();
>     final DefaultListSelectionModel selectionModel =
>       new DefaultListSelectionModel();
>     selectionModel.setSelectionMode(
>       ListSelectionModel.SINGLE_SELECTION);
>     selectionModel.addListSelectionListener(
>       new ListSelectionListener() {
>       @Override
>       public void valueChanged(ListSelectionEvent e) { 
>         if (useLast) {
>           list1.setSelectedIndex(lastIndex);
>           list2.setSelectedIndex(lastIndex);
>           useLast = false;
>         }
>       }
>     });
> 
>     JButton addButton=new JButton("Add Item");
>     addButton.addActionListener(new ActionListener() {
>       @Override
>       public void actionPerformed(ActionEvent e) {
>         lastIndex = list1.getSelectedIndex();
>         useLast = true;
>         model.add(0, "AddedItem 0");
>       }
> 
>     });
> 
>     frame.add(list1, BorderLayout.WEST);
>     frame.add(list2, BorderLayout.EAST);
>     frame.add(addButton, BorderLayout.SOUTH);
> 
>     list1.setModel(model);
>     list2.setModel(model);
>     list1.setSelectionModel(selectionModel);
>     list2.setSelectionModel(selectionModel);
> 
>     for (int i = 0; i < 10; i++)
>       model.addElement(String.format("Item number %d", i));
> 
>     SwingUtilities.invokeLater(new Runnable() {

And here you finally push code onto the EDT, but the construction was not.

>       //@Override
>       public void run() {
>         frame.setSize(500, 500);
>         frame.setVisible(true);

No call to 'pack()'.

>       }
> 
>     });
>   }
> }
> </code>

-- 
Lew

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Thread

Sharing ListSelectionMode "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
  Re: Sharing ListSelection "Sabine Dinis Blochberger" <sabine.dinis.blochberger@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
    Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
      Re: Sharing ListSelection "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
        Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
          Re: Sharing ListSelection "John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
            Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
              Re: Sharing ListSelection "John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
                Re: Sharing ListSelection "Lew" <lew@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000
            Re: Sharing ListSelection "Stefan Rybacki" <stefan.rybacki@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000

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