Point wrong list in Nimbus ListCellRenderer custom background color

Hello

I did a lot of research on the web being lead to what happens here. It seems that other people have had the same problem that I had, but in the only place that seems to nail the issue directly, it seems not be solved. The problem is that I use a JPanel as a ListCellRenderer for a JList. I use Nimbus Lebanese armed forces, and my problem is that the background of the Panel does not seem to have its background color set correctly. I call setBackground on it and it should be the establishment of a DerivedColor which is pure white, but he seems to have no effect. Manually dialing the white setBackground works, but it also means I've now hardcoded color in it, I'm currently doing. Here's some code to reproduce the problem:

import java.awt.Component;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.border.Border;

public class ListTest extends JFrame {

  private JScrollPane scrollPane = new JScrollPane();
  private JList list = new JList(new String[] {"TEST 1", "TEST 2"});

  private class Renderer extends JPanel implements ListCellRenderer {

    private JLabel text = new JLabel();

    public Renderer() {
      add(text);
    }
        
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
      
      setEnabled(list.isEnabled());

      Border border = null;
      if (cellHasFocus) {
        if (isSelected) {
          border = UIManager.getBorder("List.focusSelectedCellHighlightBorder");
        }
        if (border == null) {
          border = UIManager.getBorder("List.focusCellHighlightBorder");
        }
      } else {
        border = UIManager.getBorder("List.cellNoFocusBorder");
      }
      setBorder(border);

      // set renderer values
      text.setText((String)value);
      text.setFont(list.getFont());
 
      if (isSelected) {
        setBackground(list.getSelectionBackground());
        text.setForeground(list.getSelectionForeground());
      } else {
        // the color returned from list.getBackground() is pure white
        // but the list items appear with a grey background!
        setBackground(list.getBackground());
        // THIS works -- but is obviously hardcoded
        // setBackground(Color.WHITE);
        text.setForeground(list.getForeground());
      }

      return this;
    }
  }

  public ListTest() {
    list.setCellRenderer(new Renderer());
    scrollPane.setViewportView(list);
    add(scrollPane);
    pack();
  }

  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {

      public void run() {

        for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
          if ("Nimbus".equals(info.getName())) {
            try {
              UIManager.setLookAndFeel(info.getClassName());
            } catch (Exception ex) { }
          }
        }

        new ListTest().setVisible(true);
      }
    });
  }
}

Here's a StackOverflow question is exactly what I saw, but does not seem to be solved exactly: http://stackoverflow.com/questions/2787781

Any ideas would be greatly appreciated!

Thank you!

// the color returned from list.getBackground() is pure white
// but the list items appear with a grey background!
setBackground(list.getBackground());
// THIS works -- but is obviously hardcoded
// setBackground(Color.WHITE);

Then when hard-code you the background you use a Color object.

Did you add debug information to see what type of class list.getBackground () return?

If it is a class of fancy which range from color, you can always create your color object using:

Background color = new Color (...)

All you have to do is get the RGB values of the color list object.

Tags: Java

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