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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;
}
}
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