You need to set the preferred size of the JScrollBar components.
scrollpane.getVerticalScrollBar().setPreferredSize( new Dimension(width, Integer.MAX_VALUE)); scrollpane.getHorizontalScrollBar().setPreferredSize( new Dimension(Integer.MAX_VALUE, width));
You can achieve that by creating a custom ListCellRenderer. Easiest is to subclass DefaultListCellRenderer and override the getListCellRendererComponent() method to add the appropriate icon.
That just leaves how to determine which icon to use for a given combo item value. One solution to this is to provide the renderer with a set of mappings containing what icon to use for which value.
import java.awt.Component;
import java.util.HashMap;
import java.util.Map;
import javax.swing.DefaultListCellRenderer;
import javax.swing.Icon;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.plaf.metal.MetalIconFactory;
public class IconListRenderer
extends DefaultListCellRenderer {
private Map<Object, Icon> icons = null;
public IconListRenderer(Map<Object, Icon> icons) {
this.icons = icons;
}
@Override
public Component getListCellRendererComponent(
JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus) {
// Get the renderer component from parent class
JLabel label =
(JLabel) super.getListCellRendererComponent(list,
value, index, isSelected, cellHasFocus);
// Get icon to use for the list item value
Icon icon = icons.get(value);
// Set icon to display for value
label.setIcon(icon);
return label;
}
/**
* @param args
*/
public static void main(String[] args) {
// setup mappings for which icon to use for each value
Map<Object, Icon> icons = new HashMap<Object, Icon>();
icons.put("details",
MetalIconFactory.getFileChooserDetailViewIcon());
icons.put("folder",
MetalIconFactory.getTreeFolderIcon());
icons.put("computer",
MetalIconFactory.getTreeComputerIcon());
JFrame frame = new JFrame("Icon List");
frame.setDefaultCloseOperation(
JFrame.DISPOSE_ON_CLOSE);
// create a list with some test data
JComboBox combo = new JComboBox(
new Object[] {
"details", "computer", "folder", "computer"});
// create a cell renderer to add the appropriate icon
combo.setRenderer(new IconListRenderer(icons));
frame.add(combo);
frame.pack();
frame.setVisible(true);
}
}
You need to add your JList (or any component) to a JScrollPane. Easiest way to do this is to pass your component to the JScrollPane’s constructor. You then add the JScrollPane to your component hierarchy (instead of adding your JList).
JScrollPane scrollPne = new JScrollPane(mylist); panel.add(scrollPane);