JList.getSelectionBackground() : JList « javax.swing « Java by API

1. Java by API
2. javax.swing
3. JList

JList.getSelectionBackground()

  
//
import java.awt.Component;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.event.ListDataListener;

public class MainClass extends JFrame {

  MainClass(String s) {
    super(s);
    ListModel lm = new StaticListModel();
    JList list = new JList();
    list.setModel(lm);
    list.setCellRenderer(new MyCellRenderer());
    getContentPane().add(new JScrollPane(list));
    setDefaultCloseOperation(EXIT_ON_CLOSE);
  }

  public static void main(String[] s) {
    MainClass l = new MainClass("ListModel");
    l.pack();
    l.setVisible(true);
  }

  class MyCellRenderer extends JLabel implements ListCellRenderer {
    public Component getListCellRendererComponent(JList list, Object value, int index,
        boolean isSelected, boolean cellHasFocus) {
      Component c = null;
      if (value == null) {
        c = new JLabel("(null)");
      } else if (value instanceof Component) {
        c = (Component) value;
      } else {
        c = new JLabel(value.toString());
      }

      if (isSelected) {
        c.setBackground(list.getSelectionBackground());
        c.setForeground(list.getSelectionForeground());
      } else {
        c.setBackground(list.getBackground());
        c.setForeground(list.getForeground());
      }

      if (c instanceof JComponent) {
        ((JComponent) c).setOpaque(true);
      }

      return c;
    }
  }

  class StaticListModel implements ListModel {
    private final Object[] data = { "Hello", new Object(), new java.util.Date(),
        new JLabel("Hello world!"), this, };

    public Object getElementAt(int index) {
      return data[index];
    }

    public int getSize() {
      return data.length;
    }

    public void addListDataListener(ListDataListener ldl) {
    }

    public void removeListDataListener(ListDataListener ldl) {
    }
  }
}

           
         
    
  

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