How to deal with derived color in Nimbus Look and Feel?

Question

What I want is to make the background of a uneditable text area the same as its disabled background.

I know that the color is available from the UIManager with the key TextArea.disabled:

DerivedColor(color=214,217,223 parent=control offsets=0.0,0.0,0.0,0 pColor=214,217,223

I firstly tried:

textArea.setBackground(UIManager.getColor("TextArea.disabled"));

It changed nothing at all and the background was still white.

Then I tried:

textArea.setBackground(new Color(UIManager.getColor("TextArea.disabled").getRGB()));

The background did change but was not exactly the same as the disabled background which looks brighter.

What is the correct way to deal with this derived color?

see Oracle Tutorial about Look and Feel, override proper Keys for JTextArea — mKorbel, Jan 10 '13 at 10:02

score 4 · Answer 1 · answered Jan 10 '13 at 10:49

@Zhao Yi wrote There is no key for uneditable background

again see Oracle Tutorial about Look and Feel, override proper Keys for JTextArea
Keys value is for Painter
TextArea[Disabled+NotInScrollPane].backgroundPainter
TextArea[Disabled].backgroundPainter

enter image description here

code for Java6, have to change imports for Java7

import com.sun.java.swing.Painter;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;

public class TestNimbusUIManagerTextArea {

    private static JFrame frame = new JFrame("Nimbus UIDeafaults");
    private JTextArea testEnableTextArea = new JTextArea("enabled JTextArea");
    private JTextArea testDisableTextArea = new JTextArea("disabled JTextArea");

    public TestNimbusUIManagerTextArea() {
        testDisableTextArea.setEnabled(false);
        frame.setLayout(new GridLayout(2, 0, 20, 20));
        frame.add(testEnableTextArea);
        frame.add(testDisableTextArea);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(200, 105);
        frame.pack();
        frame.setVisible(true);
    }

    private static void customizeNimbusLaF() {
        UIManager.getLookAndFeelDefaults().put(
                "TextArea[Enabled+NotInScrollPane].backgroundPainter",
                new FillPainter(new Color(127, 255, 191)));
        UIManager.getLookAndFeelDefaults().put(
                "TextArea[Disabled+NotInScrollPane].backgroundPainter",
                new FillPainter(new Color(127, 255, 191)));
        SwingUtilities.updateComponentTreeUI(frame);
    }

    public static void main(String arg[]) {
        try {
            for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    UIManager.setLookAndFeel(info.getClassName());
                    customizeNimbusLaF();                   
                    break;
                }
            }
        } catch (Exception e) {
        }
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                TestNimbusUIManagerTextArea tNUIM = new TestNimbusUIManagerTextArea();
            }
        });
    }
}

class FillPainter implements Painter<JComponent> {

    private final Color color;

    FillPainter(Color c) {
        color = c;
    }

    @Override
    public void paint(Graphics2D g, JComponent object, int width, int height) {
        g.setColor(color);
        g.fillRect(0, 0, width - 1, height - 1);
    }
}

Thanks for the code, but this is not what I want. I just want to make the uneditable (not disabled) text areas have the same background as its disabled background (Nimbus default). Additionally, `Painter` is not a public API, so it's not a good practice to customized Nimbus like this. — Zhao Yi, Jan 11 '13 at 02:04
in the case that you JTextArea.setEditable(false), then nothing happened, Colors scheme stays unchanged, use (not for Nimbus) that for JTextComponent only — mKorbel, Jan 11 '13 at 07:49
+1, Nimbus is more complicated than other LAF. It looks like I need to update the UIManagerDefaults to include the new Nimbus syntax for properties. — camickr, Jun 18 '13 at 16:00

score 0 · Accepted Answer · answered Jan 11 '13 at 02:36

0

I've found the answer. The color used for disabled background is not UIManager.getColor("TextArea.disabled"), but hard-coded in class TextAreaPainter:

private Color color1 = decodeColor("nimbusBlueGrey", -0.015872955f, -0.07995863f, 0.15294117f, 0);

Using this color solves my issue.

answered Jan 11 '13 at 02:36

Zhao Yi

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decodeColor()? Where is it from? – Gustavo Feb 13 '23 at 18:54

How to deal with derived color in Nimbus Look and Feel?

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