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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
public class MainClass {
public static void main(String args[]) throws Exception {
Color colors[] = { Color.GREEN, Color.ORANGE, Color.PINK, Color.RED,
Color.WHITE, Color.YELLOW };
JFrame frame = new JFrame("Color JComboBox");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JComboBox comboBox = new JComboBox(colors);
comboBox.setMaximumRowCount(5);
comboBox.setEditable(true);
comboBox.setRenderer(new ColorCellRenderer());
frame.add(comboBox, BorderLayout.NORTH);
final JLabel label = new JLabel();
label.setOpaque(true);
label.setBackground((Color) comboBox.getSelectedItem());
frame.add(label, BorderLayout.CENTER);
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
Color selectedColor = (Color) comboBox.getSelectedItem();
label.setBackground(selectedColor);
}
};
comboBox.addActionListener(actionListener);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
class ColorCellRenderer implements ListCellRenderer {
protected DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer();
private final static Dimension preferredSize = new Dimension(0, 20);
public Component getListCellRendererComponent(JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus) {
JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index,
isSelected, cellHasFocus);
if (value instanceof Color) {
renderer.setBackground((Color) value);
}
renderer.setPreferredSize(preferredSize);
return renderer;
}
}
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