How can I make a default border for a JWindow?

> The problem is there is no such class RootPane.

If you look at all the properties in the UIManager, none of them are "classes". They are simply keywords used to look up a given property. Basically its a Hashtable, where you have keyword, value pairs.

All I am suggesting is that you can use this Border if you want. I don't know if this will meet your requirements or not, but it the the only way I can think of getting a Border. Borders are Swing concepts and a JFRame is not a Swing component, so you can't just get the Border of the JFrame. Your code would be something like:

JPanel contentPane = (JPanel)yourWindow.getContentPane();

contentPane.setBorder( UIManager.getBorder( "RootPane.frameBorder" ) );

This will only work if you are using the Metal LAF. I don't know what will happen with other LAF's.

camickra at 2007-7-11 14:54:52 >

> Also, I'm curious why you said that JFrame is not a swing component.

A Swing component extends JComponent. Basically this means that all the painting of the component is done in Java. You can add Borders to any Swing component. It is called a light weight component. A light weight component cannot exist by itself on the window desktop.

JFrame, JDialog and JWindow are top level components. They can exist on their own on the windows desktop because essentially they are Windows native components. They have been fancied up to make it easy for you to access and add other Swing components to it which is why they are found in the swing package.

A Windows border is not the same thing as a Swing Border and there is no way to access the native windows border and use it in a Swing application (that I know of anyway). Swing Borders are not used in a normal JFrame, the Windows border is used. You can however, turn off the use of Windows decorations and use Swing painted decorations. Read the tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/components/frame.html#setDefaultLookAndFeelDecorated]Specifying Windows Decorations[/url]. However, this doesn't really help you with your Border problem. If you look at the source code for the FrameBorder, you will find that the "blue" color of the Border is only painted for "active" windows and a JWindow can never be the active window, only the parent JFrame or JDialog is considered active.

Here is a simple program for you to play around with:

import java.awt.*;

import javax.swing.*;

import javax.swing.border.*;

public class FrameDecorated

{

public static void main(String[] args)

{

JFrame.setDefaultLookAndFeelDecorated(true);

JFrame frame = new JFrame();

frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );

frame.setSize(300, 300);

frame.setVisible(true);

Border border = frame.getRootPane().getBorder();

//Border border = UIManager.getBorder( "RootPane.frameBorder" );

System.out.println( border );

JWindow window = new JWindow(frame);

JPanel contentPane = (JPanel)window.getContentPane();

contentPane.add(new JTextField(), BorderLayout.NORTH);

contentPane.setBorder( border );

window.setSize(300, 300);

window.setLocationRelativeTo( null );

window.setVisible( true );

System.out.println("Window:" + window);

Window ancestor = SwingUtilities.getWindowAncestor(contentPane);

System.out.println("Ancestor:" + ancestor);

System.out.println(ancestor.isActive());

System.out.println(frame.isActive());

}

}

camickra at 2007-7-11 14:54:52 >