仅RGB的JColorChooser（Java 7）

Question

I'm trying to create a JFrame including a JPanel containing only the stuff necessary to choose a RGB color. I've been messing around with JColorChooser , AbstractColorChooserPanel and ColorModel, reading Oracle tutorials, but I didn't get to understand how to develop exactly what I want. I've even downloaded OpenJDK source to fetch the source codes of these classes, but still nothing. What I want to get is this:

The Alpha stuff should disappear and the color code field should be set to invisible but keep working so I can retrieve the code when the "Yes" button is clicked (within an actionPerformed method, I guess). As well it'd be a nice addition to override the paintComponent method.

Thanks in advance.

EDIT: This is how I get what I currently have (the above photo, without the 'Paint'-edits):

for (final AbstractColorChooserPanel accp : panels) {
  if (accp.getDisplayName().equals("RGB")) {
    JOptionPane.showOptionDialog(Main.frame, accp,
    "Color selection tool", JOptionPane.OK_OPTION,
    JOptionPane.QUESTION_MESSAGE, null, null, 0);
  }
}

EDIT2 : By far, I've now been able to get to delete the alpha stuff, but I can't yet get to 'find' the label and field showing the Color Code, so they keep showing and, additionally, since I can't access the field, I can't access the color code:

This is with this code:

package edu.utils;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.reflect.Array;
import java.lang.reflect.Field;

import javax.swing.JColorChooser;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JSpinner;
import javax.swing.WindowConstants;
import javax.swing.colorchooser.AbstractColorChooserPanel;

import edu.io.local.Log;

public final class RGBColorChooserPanel extends JDialog implements ActionListener {

private final JColorChooser jCC;
private final JPanel        panel;
private String              colorCode;

public RGBColorChooserPanel(final String title) {
super(edu.Main.frame);
this.setTitle(title);
this.jCC = new JColorChooser();
this.modifyJColorChooser();
this.panel = new JPanel() {
    @Override
    protected void paintComponent(final Graphics g) {
    final Graphics2D g2d = (Graphics2D) g;
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);

    final GradientPaint gp = new GradientPaint(0, 0, Color.BLUE, 0, this.getHeight(),
            Color.BLACK);

    g2d.setPaint(gp);
    g2d.fillRect(0, 0, this.getWidth(), this.getHeight());

    super.paintComponent(g);
    }
};
this.panel.add(this.jCC);
this.panel.setOpaque(false);
this.jCC.setOpaque(false);
this.jCC.setPreviewPanel(new JPanel());
this.jCC.setColor(120, 20, 57);
this.add(this.panel, BorderLayout.CENTER);
this.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
this.pack();

final Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
this.setLocation((screenSize.width - this.getWidth()) / 2,
        (screenSize.height - this.getHeight()) / 2);
this.setResizable(false);
this.setVisible(true);
}

@Override
public void actionPerformed(final ActionEvent e) {
// TODO Auto-generated method stub

}

private void modifyJColorChooser() {
final AbstractColorChooserPanel[] panels = this.jCC.getChooserPanels();
for (final AbstractColorChooserPanel accp : panels) {
    if (!accp.getDisplayName().equals("RGB")) {
    this.jCC.removeChooserPanel(accp);
    }
}

final AbstractColorChooserPanel[] colorPanels = this.jCC.getChooserPanels();
final AbstractColorChooserPanel cp = colorPanels[0];

Field f = null;
try {
    f = cp.getClass().getDeclaredField("panel");
} catch (NoSuchFieldException | SecurityException e) {
    Log.log(e);
}
f.setAccessible(true);

Object colorPanel = null;
try {
    colorPanel = f.get(cp);
} catch (IllegalArgumentException | IllegalAccessException e) {
    Log.log(e);
}

Field f2 = null;
try {
    f2 = colorPanel.getClass().getDeclaredField("spinners");
} catch (NoSuchFieldException | SecurityException e4) {
    Log.log(e4);
}
f2.setAccessible(true);
Object rows = null;
try {
    rows = f2.get(colorPanel);
} catch (IllegalArgumentException | IllegalAccessException e3) {
    Log.log(e3);
}

final Object transpSlispinner = Array.get(rows, 3);
Field f3 = null;
try {
    f3 = transpSlispinner.getClass().getDeclaredField("slider");
} catch (NoSuchFieldException | SecurityException e) {
    Log.log(e);
}
f3.setAccessible(true);
JSlider slider = null;
try {
    slider = (JSlider) f3.get(transpSlispinner);
} catch (IllegalArgumentException | IllegalAccessException e2) {
    Log.log(e2);
}
slider.setVisible(false);
Field f4 = null;
try {
    f4 = transpSlispinner.getClass().getDeclaredField("spinner");
} catch (NoSuchFieldException | SecurityException e1) {
    Log.log(e1);
}
f4.setAccessible(true);
JSpinner spinner = null;
try {
    spinner = (JSpinner) f4.get(transpSlispinner);
} catch (IllegalArgumentException | IllegalAccessException e) {
    Log.log(e);
}
spinner.setVisible(false);
Field f5 = null;
try {
    f5 = transpSlispinner.getClass().getDeclaredField("label");
} catch (NoSuchFieldException | SecurityException e1) {
    Log.log(e1);
}
f5.setAccessible(true);
JLabel label = null;
try {
    label = (JLabel) f5.get(transpSlispinner);
} catch (IllegalArgumentException | IllegalAccessException e) {
    Log.log(e);
}
label.setVisible(false);

Field f6 = null;
try {
    f6 = transpSlispinner.getClass().getDeclaredField("value");
} catch (NoSuchFieldException | SecurityException e1) {
    Log.log(e1);
}
f6.setAccessible(true);
float value = 0;
try {
    value = (float) f6.get(transpSlispinner);
} catch (IllegalArgumentException | IllegalAccessException e) {
    Log.log(e);
}
}
}

PS: I know about the weirdness of the exception handling, but I need to manage exceptions per-statement, so please no complaints on that.

Answer 1

Your best option is Creating a Custom Chooser Panel by extending AbstractColorChooserPanel . The tutorial example , while elementary, is a useful guide to installation and usage. A complete implementation of your sketch is beyond the scope of SO; but among the many extant examples , this one and this one seem worth closer examination. This related Q&A may also offer some insight.