ColorComboRenderer.java Source code

Introduction

Here is the source code for ColorComboRenderer.java

Source

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.ListCellRenderer;
import javax.swing.ToolTipManager;
import javax.swing.border.CompoundBorder;
import javax.swing.border.LineBorder;
import javax.swing.border.MatteBorder;

public class ColorComboRenderer extends JPanel implements ListCellRenderer {
    protected Color m_c = Color.black;

    public ColorComboRenderer() {
        super();
        setBorder(new CompoundBorder(new MatteBorder(2, 10, 2, 10, Color.white), new LineBorder(Color.black)));
    }

    public Component getListCellRendererComponent(JList list, Object obj, int row, boolean sel, boolean hasFocus) {
        if (obj instanceof Color)
            m_c = (Color) obj;
        return this;
    }

    public void paint(Graphics g) {
        setBackground(m_c);
        super.paint(g);
    }

    public static void main(String[] a) {
        JComboBox cbColor = new JComboBox();
        int[] values = new int[] { 0, 128, 192, 255 };
        for (int r = 0; r < values.length; r++)
            for (int g = 0; g < values.length; g++)
                for (int b = 0; b < values.length; b++) {
                    Color c = new Color(values[r], values[g], values[b]);
                    cbColor.addItem(c);
                }
        cbColor.setRenderer(new ColorComboRenderer());

        JFrame f = new JFrame();
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        f.getContentPane().add(cbColor);
        f.pack();
        f.setSize(new Dimension(300, 80));
        f.show();

    }
}