Re: Can someone tell me w

I've got two lists and one button, ( you can run the code below to see
it ), top list is a listing of the current directory, press the button
and the selected files above should get moved into the list below.
When I step through it, it looks like it is doing the right
thing...but it's not showing up in the lower list. I thought the
following method call would cause the list to get ( repainted? ).
Apologies, I'm totally new to java gui programming.

JList.ensureIndexIsVisible(int index);

Here is the code:

------------------------------------------------
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListModel;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListDataListener;

public class DoubleClickList extends JFrame implements ActionListener
{
    private static final long serialVersionUID = 1L;
    private JList localFilesJList, localFilesToTransferJList;
    private JScrollPane localFilesScrollPane,
localFilesToTransferScrollPane;
    private JButton addLocalFilesButton;

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new DoubleClickList().setVisible(true);
            }
        });
    }

    public DoubleClickList() {
        initComponents();
    }

    private void initComponents() {
        localFilesScrollPane = new JScrollPane();
        localFilesToTransferScrollPane = new JScrollPane();
        localFilesJList = new JList();
        localFilesToTransferJList = new JList();
        addLocalFilesButton = new JButton("Add Files For Transfer");
        addLocalFilesButton.addActionListener(this);
        setupList( localFilesJList, localFilesScrollPane,
createLocalFilesModel() );
        setupList( localFilesToTransferJList,
localFilesToTransferScrollPane, new FileListModel() );

        setupLayout( localFilesScrollPane,
localFilesToTransferScrollPane, addLocalFilesButton );
    }

    private void setupList(JList jList, JScrollPane scrollPane, ListModel
model ) {
        jList.setModel( model );

jList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        jList.setLayoutOrientation(JList.VERTICAL);
        // jList.setVisibleRowCount(10);
        scrollPane.setViewportView(jList);
    }

    private void setupLayout( JScrollPane jScrollPane1, JScrollPane
jScrollPane2, JButton jButton1) {
        javax.swing.GroupLayout layout = new
javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
 
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jButton1)
                    .addComponent(jScrollPane2,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(315, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
 
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jButton1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane2,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE))
        );
        pack();
    }

    private FileListModel createLocalFilesModel() {
        File currDir = new File(".");
        String[] files = currDir.list();
        FileListModel model = new FileListModel();
        int currDirParentDirCount = 0;
        model.addElementAt(currDirParentDirCount++, currDir);
        File parentDir;
        if ( null != currDir.getParentFile() ) {
            parentDir = currDir.getParentFile();
            model.addElementAt(currDirParentDirCount++, parentDir);
        }

        for (int fileNameIndex = 0; fileNameIndex < files.length;
fileNameIndex++) {
            String filename = files[fileNameIndex];
            File currFile = new File(filename);
            model.addElementAt( currDirParentDirCount + fileNameIndex,
currFile);
        }
        return model;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        FileListModel model = (FileListModel)
localFilesToTransferJList.getModel();
        localFilesToTransferJList.setSelectedIndex(0);
        localFilesToTransferJList.ensureIndexIsVisible(0);
        /*
        model.addElementAt(1, new File("bin"));
        int maxSelectionIndex = localFilesJList.getMaxSelectionIndex();
        int minSelectionIndex = localFilesJList.getMinSelectionIndex();
        FileListModel localFiles = (FileListModel)
localFilesJList.getModel();
        FileListModel localTransferFiles = ( FileListModel )
localFilesToTransferJList.getModel();
        if ( minSelectionIndex >= 0 ) {
            for (int index = minSelectionIndex; index <= maxSelectionIndex;
index++) {
                if ( localFilesJList.isSelectedIndex(index)) {
                    File currFile = localFiles.getFileAt(index);
                    if ( ! localTransferFiles.contains(currFile)) {
                        localTransferFiles.addElementAt(localTransferFiles.getSize(),
currFile);
                    }
                }
            }
            int lastVisibleIndex =
localFilesToTransferJList.getLastVisibleIndex();
            int index = -1 == lastVisibleIndex ? 0 : lastVisibleIndex;
            localFilesToTransferJList.setSelectedIndex(index);
            localFilesToTransferJList.ensureIndexIsVisible(index);
        }
        */
    }
}
class FileListModel implements ListModel {
    private ArrayList<File> files;
    public FileListModel() {
        files = new ArrayList<File>();
    }
    public void addElementAt(int fileNameIndex, File currFile) {
        files.add(fileNameIndex, currFile);
    }
    public Object getElementAt(int index) {
        File file = files.get(index);
        return file.getName();
    }
    public File getFileAt( int index ) {
        return files.get(index);
    }
    public int getSize() {
        return files.size();
    }
    public boolean contains( File file ) {
        return files.contains(file);
    }

    public void addListDataListener(ListDataListener l) {
    }
    public void removeListDataListener(ListDataListener l) {
    }
}