Problem in showing multiple columns and rows in horizontal wrap as like as

Question

I am trying to implement the ListView in my application as like as in windows.
But i am able to show single row by this code snippet.
What should i do to show  the multiple row ,multiple coloumns in JList.
import javax.swing.*;
import java.awt.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class JListExample extends JFrame
    private class Value
        Value(String value, Icon image)
            this.value = value;
            this.image = image;
        String value;
        Icon image;
    private Icon getIcon(String name)
        return new ImageIcon(name);
    public JListExample()
        super("Simple JList Example");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final Value[] VALUES =
            new Value("the road", getIcon("10.jpg")),
            new Value("trees",  getIcon("11.jpg")),
            new Value("stooges",  getIcon("12.jpg")),
            new Value("bauld tires",  getIcon("13.jpg")),
            new Value("bvot tires",  getIcon("14.jpg")),
            new Value("volt tires",  getIcon("15.jpg")),
            new Value("send tires",  getIcon("17.jpg")),
        JList list = new JList(VALUES);
        list.setLayoutOrientation(JList.HORIZONTAL_WRAP);
        list.setVisibleRowCount(1);
        list.setCellRenderer(new SimpleCellRenderer());
        list.addListSelectionListener(new ListSelectionListener() {
        public void valueChanged(ListSelectionEvent evt) {
            if (evt.getValueIsAdjusting())
            return;
            System.out.println("Selected from " + evt.getFirstIndex()
                + " to " + evt.getLastIndex());
        JScrollPane ListViewer = new JScrollPane(list);
        getContentPane().add(ListViewer);
        setBounds(0,0,600,600);
        //pack();
    public static void main(String[] args)
        try
            new JListExample().setVisible(true);
        catch (Exception e)
            e.printStackTrace(System.out);
    class SimpleCellRenderer extends JLabel implements ListCellRenderer
        public SimpleCellRenderer()
            setOpaque(true);
        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)
            Value val = (Value)value;
            setText(val.value);
            setIcon(val.image);
            //setBackground(isSelected ? Color.red : (index & 1)  ==0 ?                 Color.cyan : Color.green);
            //setForeground(isSelected ? Color.white : Color.black);
            return this;
}

Answer 1

I know this is an old topic, but I found the solution and thought I'd share it! By default, a JList only has 1 visible row. To allow the number of rows to expand dynamically, throw this in.
this.imageList.setVisibleRowCount(-1);My code looks like this. It centers each image and centers the text under the image and wraps images horizontally.
    ListCellRenderer renderer = new ImageListCellRenderer();
    this.imageList.setCellRenderer(renderer);
    DefaultListModel listModel = new DefaultListModel();
    this.imageList.setVisibleRowCount(-1);
    this.imageList.setLayoutOrientation(JList.HORIZONTAL_WRAP);
    this.imageList.setModel(listModel);and the renderer
public class ImageListCellRenderer extends DefaultListCellRenderer { 
  public Component getListCellRendererComponent(JList list, Object value, int
      index, boolean isSelected, boolean hasFocus) {
    JLabel label = (JLabel)super.getListCellRendererComponent(list, value,
        index, isSelected, hasFocus);
    if (value instanceof File) {
      File imageFile = (File)value;
      String path = imageFile.getAbsolutePath();
      Image image = Toolkit.getDefaultToolkit().getImage(path);
      image = image.getScaledInstance(100, 100, Image.SCALE_DEFAULT);
      ImageIcon imageIcon = new ImageIcon(image);
      label.setIcon(imageIcon);
      label.setText(path.substring(path.lastIndexOf(File.separatorChar) + 1));
      label.setVerticalTextPosition(SwingConstants.BOTTOM);
      label.setHorizontalAlignment(SwingConstants.CENTER);
      label.setHorizontalTextPosition(SwingConstants.CENTER);
    else {
      label.setIcon(null);
    return label;
}I need to work on this to improve performance, but it works!