Java 7 JColorChooser: Disable Transparency Slider

Question

JDK 7 added a new transparency slider to the JColorChooser:

The proble

Answer 1

Although it's implementation dependent, you can remove concrete subclasses of AbstractColorChooserPanel by name.

This example removes all but the RGB panel:

AbstractColorChooserPanel[] ccPanels = chooser.getChooserPanels();
for (AbstractColorChooserPanel ccPanel : ccPanels) {
    System.out.println(ccPanel.getDisplayName());
    String name = ccPanel.getClass().getSimpleName();
    if (!"DefaultRGBChooserPanel".equals(name))
        tcc.removeChooserPanel(ccPanel);
}

This example restores the HSB panel:

for (AbstractColorChooserPanel ccPanel : ccPanels) {
    String name = ccPanel.getClass().getSimpleName();
    if ("DefaultHSBChooserPanel".equals(name))
        tcc.addChooserPanel(ccPanel);
}

You'll need to determine the desired name(s) empirically.

Answer 2

Java 9 adds a new property to AbstractColorChooserPanel to control these sliders:

public void setColorTransparencySelectionEnabled(boolean b);
public boolean isColorTransparencySelectionEnabled();

There is also a new overload of the static JColorChooser.showDialog method to specify that same property:

public static Color showDialog(Component component, String title, Color initialColor,
    boolean colorTransparencySelectionEnabled);

Java 9 is expected to be released in March 2017.

Answer 3

Here is a slight modification of aymeric's answer that hides them altogether instead of disabling.

private static void removeTransparencySlider(JColorChooser jc) throws Exception {

    AbstractColorChooserPanel[] colorPanels = jc.getChooserPanels();
    for (int i = 1; i < colorPanels.length; i++) {
        AbstractColorChooserPanel cp = colorPanels[i];

        Field f = cp.getClass().getDeclaredField("panel");
        f.setAccessible(true);

        Object colorPanel = f.get(cp);
        Field f2 = colorPanel.getClass().getDeclaredField("spinners");
        f2.setAccessible(true);
        Object spinners = f2.get(colorPanel);

        Object transpSlispinner = Array.get(spinners, 3);
        if (i == colorPanels.length - 1) {
            transpSlispinner = Array.get(spinners, 4);
        }
        Field f3 = transpSlispinner.getClass().getDeclaredField("slider");
        f3.setAccessible(true);
        JSlider slider = (JSlider) f3.get(transpSlispinner);
        slider.setEnabled(false);
        slider.setVisible(false);
        Field f4 = transpSlispinner.getClass().getDeclaredField("spinner");
        f4.setAccessible(true);
        JSpinner spinner = (JSpinner) f4.get(transpSlispinner);
        spinner.setEnabled(false);
        spinner.setVisible(false);

        Field f5 = transpSlispinner.getClass().getDeclaredField("label");
        f5.setAccessible(true);
        JLabel label = (JLabel) f5.get(transpSlispinner);
        label.setVisible(false);
    }
}

Answer 4

According to the documentation, it's possible to just modify/configure the existing classes. So recommended way to go is therefore to create your own ChooserPanels (they need to extend AbstractColorChooserPanel) and then invoke

JColorChooser jc = new JColorChooser();
jc.setChooserPanels(new AbstractColorChooserPanel[]{yourChooserPanel});

Alternatively, if yor aree looking for a faster/nastier/uglier way to do it, wrote this for you:

private static void removeTransparencySlider(JColorChooser jc) throws Exception {

    AbstractColorChooserPanel[] colorPanels = jc.getChooserPanels();
    for (int i = 1; i < colorPanels.length; i++) {
        AbstractColorChooserPanel cp = colorPanels[i];

        Field f = cp.getClass().getDeclaredField("panel");
        f.setAccessible(true);

        Object colorPanel = f.get(cp);
        Field f2 = colorPanel.getClass().getDeclaredField("spinners");
        f2.setAccessible(true);
        Object spinners = f2.get(colorPanel);

        Object transpSlispinner = Array.get(spinners, 3);
        if (i == colorPanels.length - 1) {
            transpSlispinner = Array.get(spinners, 4);
        }
        Field f3 = transpSlispinner.getClass().getDeclaredField("slider");
        f3.setAccessible(true);
        JSlider slider = (JSlider) f3.get(transpSlispinner);
        slider.setEnabled(false);
        Field f4 = transpSlispinner.getClass().getDeclaredField("spinner");
        f4.setAccessible(true);
        JSpinner spinner = (JSpinner) f4.get(transpSlispinner);
        spinner.setEnabled(false);
    }
}

Good luck with it :)

Answer 5

The other answers here show how to remove the transparency sliders from an instance of JColorChooser, but the main way to use JColorChooser is the static showDialog method, in which case you don't get access to an instance. Therefore I present two methods, one which hides the controls from an instance of JColorChooser, and a drop-in replacement method for showDialog that has showTransparencyControls as a extra parameter:

import java.awt.*;
import java.awt.event.ActionListener;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import javax.swing.*;
import javax.swing.colorchooser.AbstractColorChooserPanel;

class SwingUtil {
    /**
     * Hides controls for configuring color transparency on the specified
     * color chooser.
     */
    public static void hideTransparencyControls(JColorChooser cc) {
        AbstractColorChooserPanel[] colorPanels = cc.getChooserPanels();
        for (int i = 0; i < colorPanels.length; i++) {
            AbstractColorChooserPanel cp = colorPanels[i];
            try {
                Field f = cp.getClass().getDeclaredField("panel");
                f.setAccessible(true);
                Object colorPanel = f.get(cp);

                Field f2 = colorPanel.getClass().getDeclaredField("spinners");
                f2.setAccessible(true);
                Object sliders = f2.get(colorPanel);

                Object transparencySlider = java.lang.reflect.Array.get(sliders, 3);
                if (i == colorPanels.length - 1)
                    transparencySlider = java.lang.reflect.Array.get(sliders, 4);

                Method setVisible = transparencySlider.getClass().getDeclaredMethod(
                    "setVisible", boolean.class);
                setVisible.setAccessible(true);
                setVisible.invoke(transparencySlider, false);
            } catch (Throwable t) {}
        }
    }


    /**
     * Shows a modal color chooser dialog and blocks until the dialog is
     * closed.
     * 
     * @param component the parent component for the dialog; may be null
     * @param title the dialog's title
     * @param initialColor the initial color set when the dialog is shown
     * @param showTransparencyControls whether to show controls for
     *        configuring the color's transparency
     * @return the chosen color or null if the user canceled the dialog
     */
    public static Color showColorChooserDialog(Component component,
            String title, Color initialColor, boolean showTransparencyControls) {
        JColorChooser pane = new JColorChooser(
            initialColor != null ? initialColor : Color.white);
        if (!showTransparencyControls) hideTransparencyControls(pane);
        Color[] result = new Color[1];
        ActionListener okListener = e -> result[0] = pane.getColor();
        JDialog dialog = pane.createDialog(component, title, true, pane, okListener, null);
        dialog.setVisible(true);
        dialog.dispose();
        return result[0];
    }
}