Java tutorial
import java.awt.BorderLayout; import java.awt.Component; import javax.swing.DefaultListCellRenderer; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.ListCellRenderer; import javax.swing.border.Border; import javax.swing.border.EmptyBorder; import javax.swing.border.LineBorder; import javax.swing.border.TitledBorder; public class SizingSamples { public static void main(String args[]) { JFrame frame = new JFrame("Sizing Samples"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); DefaultListModel model = new DefaultListModel(); model.ensureCapacity(100); for (int i = 0; i < 100; i++) { model.addElement(Integer.toString(i)); } JList jlist2 = new JList(model); ListCellRenderer renderer = new FocusedTitleListCellRenderer(); jlist2.setCellRenderer(renderer); JScrollPane scrollPane2 = new JScrollPane(jlist2); frame.add(scrollPane2, BorderLayout.CENTER); frame.setSize(300, 350); frame.setVisible(true); jlist2.ensureIndexIsVisible(50); } } class FocusedTitleListCellRenderer implements ListCellRenderer { protected static Border noFocusBorder = new EmptyBorder(15, 1, 1, 1); protected static TitledBorder focusBorder = new TitledBorder(LineBorder.createGrayLineBorder(), "title"); protected DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer(); public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus); renderer.setBorder(cellHasFocus ? focusBorder : noFocusBorder); return renderer; } }