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JTabbedPane display Problem

 
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Posts: 2
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Hello:
I have a JTabbedPane with 2 Tabs. Each Tab is subdivided with several JPanels. On the BOTTOM (initially unselected) tab their is a Choice(Drop Down Menu). The problem is when my application starts the choice is visible, eventhough it's tab is not selected. This problem remains until I select it's tab and then reselect the original.
Anyone have this problem before
Thanks!
Update:
I found a piece of simple code on the net, it does the same thing. When I run this program I see the 2 password fields on page1 (correct), but I also see the 3 TextAreas on page3(incorrect). Incorrect, can someone run the code and tell me if they also see the TextAreas on start-up. Is this a problem with my enviroment setup?
Code:
import java.awt.*;
import javax.swing.*;
class TabbedPaneExample
extends JFrame
{
privateJTabbedPane tabbedPane;
privateJPanelpanel1;
privateJPanelpanel2;
privateJPanelpanel3;

public TabbedPaneExample()
{
// NOTE: to reduce the amount of code in this example, it uses
// panels with a NULL layout. This is NOT suitable for
// production code since it may not display correctly for
// a look-and-feel.

setTitle( "Tabbed Pane Application" );
setSize( 300, 200 );
setBackground( Color.gray );
JPanel topPanel = new JPanel();
topPanel.setLayout( new BorderLayout() );
getContentPane().add( topPanel );
// Create the tab pages
createPage1();
createPage2();
createPage3();
// Create a tabbed pane
tabbedPane = new JTabbedPane();
tabbedPane.addTab( "Page 1", panel1 );
tabbedPane.addTab( "Page 2", panel2 );
tabbedPane.addTab( "Page 3", panel3 );
topPanel.add( tabbedPane, BorderLayout.CENTER );
}
public void createPage1()
{
panel1 = new JPanel();
panel1.setLayout( null );
JLabel label1 = new JLabel( "Username:" );
label1.setBounds( 10, 15, 150, 20 );
panel1.add( label1 );
JTextField field = new JTextField();
field.setBounds( 10, 35, 150, 20 );
panel1.add( field );
JLabel label2 = new JLabel( "Password:" );
label2.setBounds( 10, 60, 150, 20 );
panel1.add( label2 );
JPasswordField fieldPass = new JPasswordField();
fieldPass.setBounds( 10, 80, 150, 20 );
panel1.add( fieldPass );
}
public void createPage2()
{
panel2 = new JPanel();
panel2.setLayout( new BorderLayout() );
panel2.add( new JButton( "North" ), BorderLayout.NORTH );
panel2.add( new JButton( "South" ), BorderLayout.SOUTH );
panel2.add( new JButton( "East" ), BorderLayout.EAST );
panel2.add( new JButton( "West" ), BorderLayout.WEST );
panel2.add( new JButton( "Center" ), BorderLayout.CENTER );
}
public void createPage3()
{
panel3 = new JPanel();
panel3.setLayout( new GridLayout( 3, 2 ) );
panel3.add( new JLabel( "Field 1:" ) );
panel3.add( new TextArea() );
panel3.add( new JLabel( "Field 2:" ) );
panel3.add( new TextArea() );
panel3.add( new JLabel( "Field 3:" ) );
panel3.add( new TextArea() );
}
// Main method to get things started
public static void main( String args[] )
{
// Create an instance of the test application
TabbedPaneExample mainFrame= new TabbedPaneExample();
mainFrame.setVisible( true );
}
}

[This message has been edited by Johnny Clark (edited June 29, 2001).]
 
Johnny Clark
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Posts: 2
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OK I came up with a work around myself, in case someone has the same problem
1.Set the "under"components with setVisible(false);
2.after creating tabbed Pane add a changelistener with something like:
tabbedPane.addChangeListener(new TabListener());
3. write a subclass of ChangeListener which:
listens for the correct tab then,
sets the underComponents visible with setVisible(true),
then removes itself so that it will never be called again.
class TabListener implements ChangeListener
{
public void stateChanged (ChangeEvent e)
{
JTabbedPane tp = (JTabbedPane)e.getSource();
JPanel p = (JPanel)tp.getSelectedComponent();
if(p == commentPanel)
{
commentPanel.displayComponents();//setVisibleTrue
logicalTabbedPane.removeChangeListener(this); //removes itself
}
}
}
thanks
Johnny
 
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