How to right-justify icon in a JLabel?
- by geoffreyzheng
For a JLabel with icon, if you setHorizontalTextPosition(SwingConstants.LEADING), the icon is painted right after text, no matter how wide the label is.
This is particularly bad for a list, as the icons would be all over the place depending on how long the text is for each item.
I traced the code and it seems to be that in SwingUtilities#layoutCompoundLabelImpl, text width is simply set to SwingUtilities2.stringWidth(c, fm, text), and icon x is set to follow text without considering label width.
Here is the simplest case:
import java.awt.*;
import javax.swing.*;
public class TestJLabelIcon
{
public static void main(String args[])
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
JLabel c = new JLabel("abc");
c.setHorizontalTextPosition(SwingConstants.LEADING);
c.setHorizontalAlignment(SwingConstants.LEADING);
c.setIcon(UIManager.getIcon("FileChooser.detailsViewIcon"));
c.setBorder(BorderFactory.createLineBorder(Color.RED));
JFrame frame = new JFrame();
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.getContentPane().add(c);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
You can see that label always fills the frame but icon stays put. You'll get the mirror problem if you set both arguments to TRAILING.
I know I can override the UI, or use a JPanel, etc. I just wonder if I'm missing something simple in JLabel. If not, it seems like a Java bug.
FYI this is jdk1.6.0_06 on Windows XP.
