Error in NapKin Look and Feel

[Yohan Weerasinghe]

Hi,

In the following code, I am triying to apply NapKin Look and Feel to my window. Please have a look at the following code

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import napkin.NapkinLookAndFeel;

public class NapKin extends JFrame
{
    private JLabel authorLabel, versionLabel, languageLabel, platformLabel, title;
    private JLabel authorTxt, versionTxt, languageTxt, platformTxt;
    private FlowLayout flow;
    private GridLayout grid;
    private JPanel northPanel, centerPanel;
    private Font f1, f2;
    
    public NapKin()
    {
        //Declaring instance variables//
        authorLabel = new JLabel("Author:");
        versionLabel = new JLabel("Version: ");
        languageLabel = new JLabel("Langugae: ");
        platformLabel = new JLabel("Platform: ");
        title = new JLabel("About");
        
        f1 = new Font("Arial Black",Font.BOLD,25);
        title.setFont(f1);
        
        f2 = new Font("Arial",Font.BOLD,16);
        authorLabel.setFont(f2);
        versionLabel.setFont(f2);
        languageLabel.setFont(f2);
        platformLabel.setFont(f2);
        
        
        authorTxt = new JLabel("Yohan");
        versionTxt = new JLabel("1.1");
        languageTxt = new JLabel("JAVA 7");
        platformTxt = new JLabel("Any Playform(Platform Independant)");
        
        flow = new FlowLayout(FlowLayout.CENTER);
        grid = new GridLayout(4,2,1,1);
        
        
        //Designing the main window//
        northPanel = new JPanel();
        northPanel.setLayout(flow);
        northPanel.add(title);
        northPanel.setBorder(new LineBorder(Color.LIGHT_GRAY,1));
        northPanel.setBackground(Color.WHITE);
        
        centerPanel = new JPanel();
        centerPanel.setLayout(grid);
        centerPanel.add(authorLabel);
        centerPanel.add(authorTxt);
        centerPanel.add(versionLabel);
        centerPanel.add(versionTxt);
        centerPanel.add(languageLabel);
        centerPanel.add(languageTxt);
        centerPanel.add(platformLabel);
        centerPanel.add(platformTxt);
        
        getContentPane().add(northPanel, "North");
        getContentPane().add(centerPanel,"Center");
        
        setUndecorated(true);
        
        
    }
    
    public static void main(String[]args) throws UnsupportedLookAndFeelException
    {
        
            UIManager.setLookAndFeel(new NapkinLookAndFeel());
        
        
        NapKin n = new NapKin();
        n.setVisible(true);
        n.setSize(500,275);
        n.validate();
        n.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

But, I am keep getting the following exception

keys we didn't overwrite: []
Exception in thread "main" java.awt.IllegalComponentStateException: The frame is decorated
at java.awt.Frame.setBackground(Frame.java:986)
at javax.swing.JFrame.frameInit(JFrame.java:259)
at javax.swing.JFrame.<init>(JFrame.java:181)
at NapKin.<init>(NapKin.java:17)
at NapKin.main(NapKin.java:76)
Java Result: 1

Please help

[Wendy Gibbons]

when i just looked up how to set a look and feel the java pages gave this example

UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");

notice it takes a class name, not a class instance.
worth a try

[Rob Spoor]

setLookAndFeel is overloaded to take either a String with the class name, or an instance of LookAndFeel. The former delegates to the latter.

I've checked the Java 7 source code of java.awt.Frame, especially line 986 (where the exception is thrown from). The relevant code is this:

            if ((bgColor != null) && (bgColor.getAlpha() < 255) && !isUndecorated()) {
                throw new IllegalComponentStateException("The frame is decorated");
            }

Apparently, setting a transparent background color for frames is not allowed unless the frame is undecorated, and NapKin uses transparent backgrounds.

[Yohan Weerasinghe]

Thanks for the reply. I tried the following

UIManager.setLookAndFeel("napkin.NapkinLookAndFeel");

But still no good

[Yohan Weerasinghe]

Rob Spoor wrote:setLookAndFeel is overloaded to take either a String with the class name, or an instance of LookAndFeel. The former delegates to the latter.

I've checked the Java 7 source code of java.awt.Frame, especially line 986 (where the exception is thrown from). The relevant code is this:

            if ((bgColor != null) && (bgColor.getAlpha() < 255) && !isUndecorated()) {
                throw new IllegalComponentStateException("The frame is decorated");
            }

Apparently, setting a transparent background color for frames is not allowed unless the frame is undecorated, and NapKin uses transparent backgrounds.

Thanks a lot for your reply. So, does this mean I can't use NapKin Look and Feel in JAVA 7?

[Rob Spoor]

One thing you can try is the following:
- Don't set the look&feel yet.
- Create your user interface.
- Call setUndecorated(true) on the frame.
- Set the look&feel.
- Call SwingUtilities.updateComponentTreeUI for the frame.
- If necessary, call setUndecorated(false) on the frame.

[Darryl Burke]

I wonder what would result from calling the static method JFrame.setDefaultLookAndFeelDecorated(true) before setting the LaF and constructing the GUI.

[Rob Spoor]

Perhaps the same if you'd change that true to false. After all, this method is about being decorated, the other about being undecorated.

[Yohan Weerasinghe]

Rob Spoor wrote:One thing you can try is the following:
- Don't set the look&feel yet.
- Create your user interface.
- Call setUndecorated(true) on the frame.
- Set the look&feel.
- Call SwingUtilities.updateComponentTreeUI for the frame.
- If necessary, call setUndecorated(false) on the frame.

Thanks a lot for the help!! It is awesome!!! It worked!!! I am sooooooooo happy!!! Thanks a lot!


I am posting the code for anyone who has the same issue

import java.awt.*;
import java.awt.event.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.border.*;
import napkin.NapkinLookAndFeel;



public class NapKin 
{
    private JLabel authorLabel, versionLabel, languageLabel, platformLabel, title;
    private JLabel authorTxt, versionTxt, languageTxt, platformTxt;
    private FlowLayout flow;
    private GridLayout grid;
    private JPanel northPanel, centerPanel;
    private Font f1, f2;
    
    
    public NapKin()
    {
        JFrame frame = new JFrame();
        //Declaring instance variables//
        authorLabel = new JLabel("Author:");
        versionLabel = new JLabel("Version: ");
        languageLabel = new JLabel("Langugae: ");
        platformLabel = new JLabel("Platform: ");
        title = new JLabel("About");
        
        f1 = new Font("Arial Black",Font.BOLD,25);
        title.setFont(f1);
        
        f2 = new Font("Arial",Font.BOLD,16);
        authorLabel.setFont(f2);
        versionLabel.setFont(f2);
        languageLabel.setFont(f2);
        platformLabel.setFont(f2);
        
        
        authorTxt = new JLabel("Yohan Weerasighe");
        versionTxt = new JLabel("1.1");
        languageTxt = new JLabel("JAVA 7");
        platformTxt = new JLabel("Any Playform(Platform Independant)");
        
        flow = new FlowLayout(FlowLayout.CENTER);
        grid = new GridLayout(4,2,1,1);
        
        
        //Designing the main window//
        northPanel = new JPanel();
        northPanel.setLayout(flow);
        northPanel.add(title);
        northPanel.setBorder(new LineBorder(Color.LIGHT_GRAY,1));
        northPanel.setBackground(Color.WHITE);
        
        centerPanel = new JPanel();
        centerPanel.setLayout(grid);
        centerPanel.add(authorLabel);
        centerPanel.add(authorTxt);
        centerPanel.add(versionLabel);
        centerPanel.add(versionTxt);
        centerPanel.add(languageLabel);
        centerPanel.add(languageTxt);
        centerPanel.add(platformLabel);
        centerPanel.add(platformTxt);
        
        frame.add(northPanel, "North");
        frame.add(centerPanel,"Center");
        
        frame.setUndecorated(false);
        
        try
        {
            UIManager.setLookAndFeel(new NapkinLookAndFeel());
            SwingUtilities.updateComponentTreeUI(frame);
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        
        frame.setVisible(true);
        frame.setSize(500,275);
        frame.validate();
        
        
    }
    
    public static void main(String[]args) {
        NapKin n = new NapKin();
      
        
}
}

[Yohan Weerasinghe]

Thanks for everyone for the help..I really appreciate it

[Rob Spoor]

You're welcome