Name: rk38400 Date: 05/08/98


Swing 0.7 supported multiple tabs with the same
component and exhibited perfect behavior in that
respect. Swing 1.0.1 basically worked too, though
it introduced a layout problem on resize.

However, Swing 1.0.2 completely breaks this ability.
When multiple tabs are attached to the same component,
the behavior is completely wrong: missing tabs; the
component doesn't display, etc.

What is surprising is how small the code changes are
between 1.0.1 and 1.0.2 for JTabbedPane. Below is a
test snippet that demonstrates how dramatically different
those changes behave.

Before that, you might ask "why would one want to do this?"
Well, we add a custom SingleSelectionModel to the JTabbedPane
that is linked to a network of data models driving sub-components
within a single JPanel that is added to all tabs.
Essentially, the tabs serve as a radio button with a
variant rendering (as they should have been originally
architected, IMHO).
Within the world of MVC, this should be a completely
legitimate use of JTabbedPane.

Here's the tester:

<PRE><TT>
import com.sun.java.swing.*;
import java.awt.*;
import com.sun.java.swing.JFrame;

import com.sun.java.swing.JTabbedPane;
import com.sun.java.swing.JLabel;
public class TabTester extends com.sun.java.swing.JFrame
{
public TabTester()
{
getContentPane().setLayout(new BorderLayout(0,0));
setVisible(false);
setSize(405,305);

jTabbedPane1 = new com.sun.java.swing.JTabbedPane();
getContentPane().add(jTabbedPane1);

jLabel1 = new com.sun.java.swing.JLabel("Label 1");
jTabbedPane1.addTab("First=1", null, jLabel1, null);

jLabel2 = new com.sun.java.swing.JLabel("Label 2");
jTabbedPane1.addTab("Second=2", null, jLabel2, null);

jTabbedPane1.addTab("Third=1", null, jLabel1, null);
        jTabbedPane1.addTab("Fourth=2", null, jLabel2, null);
        
SymWindow aSymWindow = new SymWindow();
this.addWindowListener(aSymWindow);
}

public TabTester(String sTitle)
{
this();
setTitle(sTitle);
}

public void setVisible(boolean b)
{
if (b)
setLocation(50, 50);
super.setVisible(b);
}

static public void main(String args[])
{
(new TabTester()).setVisible(true);
}

com.sun.java.swing.JTabbedPane jTabbedPane1;
com.sun.java.swing.JLabel jLabel1;
com.sun.java.swing.JLabel jLabel2;

class SymWindow extends java.awt.event.WindowAdapter
{
public void windowClosing(java.awt.event.WindowEvent event)
{
Object object = event.getSource();
if (object == TabTester.this)
TabTester_WindowClosing(event);
}
}

void TabTester_WindowClosing(java.awt.event.WindowEvent event)
{
setVisible(false); // hide the Frame
dispose(); // free the system resources
System.exit(0); // close the application
}
}
</TT></PRE>

- JJ
(Review ID: 29924)
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