Change UI Lookup for ProgressBar Swing in Nimbus Theme

Question

I want to change Color of Progressbar from Default-Orange to Green for Nimbus UI in NetBeans.

I have added following lines

for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    UIDefaults defaults= UIManager.getDefaults();

                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    UIManager.getLookAndFeelDefaults().put("ProgressBar[Enabled+Finished].foregroundPainter", Color.GREEN);
                    UIManager.getLookAndFeelDefaults().put("ProgressBar[Enabled+Finished].backgroundPainter", Color.GREEN);
                    break;
                }
            }

This doesn't make any changes. Any correction to code or any other workarounds?

Answer 1

Nimbus doesn't operate like other look and feels (yea for us).

Normally you should be using a ColorUIResource, but Nimbus prefers the use of Painters, for example...

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.RenderingHints;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.Painter;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.plaf.ColorUIResource;

public class TestNimbus {

    public static void main(String[] args) {
        new TestNimbus();
    }

    public TestNimbus() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");

                    ProgressPainter painter = new ProgressPainter(Color.WHITE, Color.GREEN);
                    UIManager.getLookAndFeelDefaults().put("ProgressBar[Enabled+Finished].foregroundPainter", painter);
                    //UIManager.getLookAndFeelDefaults().put("ProgressBar[Enabled+Finished].backgroundPainter", painter);
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridwidth = GridBagConstraints.REMAINDER;

                JProgressBar pb = new JProgressBar();
                frame.add(pb, gbc);

                pb = new JProgressBar();
                pb.setValue(50);
                frame.add(pb, gbc);

                pb = new JProgressBar();
                pb.setValue(100);
                frame.add(pb, gbc);

                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class ProgressPainter implements Painter {

        private Color light, dark;
        private GradientPaint gradPaint;

        public ProgressPainter(Color light, Color dark) {
            this.light = light;
            this.dark = dark;
        }

        @Override
        public void paint(Graphics2D g, Object c, int w, int h) {
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            gradPaint = new GradientPaint((w / 2.0f), 0, light, (w / 2.0f), (h / 2.0f), dark, true);
            g.setPaint(gradPaint);
            g.fillRect(2, 2, (w - 5), (h - 5));

            Color outline = new Color(0, 85, 0);
            g.setColor(outline);
            g.drawRect(2, 2, (w - 5), (h - 5));
            Color trans = new Color(outline.getRed(), outline.getGreen(), outline.getBlue(), 100);
            g.setColor(trans);
            g.drawRect(1, 1, (w - 3), (h - 3));
        }
    }
}

I stole the painter from Custom Painter on JProgressBar, so credit there