JTable Component Event

[Ron Patel]

Hello All,

I am trying to detect when a JTable becomes visible (it is not the same time the JFrame becomes visible).

However, I can't seem to be able to get a Component Event from the JTable.

What do I do?

[Stephen Boston]

Here is a link with a lot of useful stuff on tables.
tables

But I didn't see a way to determine a isvisible event.

How to you setup your table and make it visiable? Perhaps you can make your own event model for it.

[Ron Patel]

The Table Model I use comes from a HashMap.

The steps the user takes to make the table visible is by clicking on a node in a JTree. When the user clicks on the node, the JTable is created and displayed in another Panel.

Is there anything I can use there?

[Stuart Gray]

Try adding a ComponentListener to the JTable. They have methods for showing, hiding, resizing, and moving components. JTable inherits the addComponentListener from java.awt.Component, which is why you might have missed.

[Ron Patel]

Apparently the JTable created Resize events instead of visible events which is why I was missing it.

Thanks all for your help.

=)

[Stephen Boston]

Well this is crude, but take a look at this and see if it helps. BTW; if you removed the table1.setVisible(false) our of the constructor the componentShown() event fires when the table is added.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
 
public class Test extends JFrame implements ComponentListener
{
JButton button1 = new JButton("Click me!");
final JTable table1;
JPanel panel;
Object[][] data = {  {"1", "2", "3"},
                         {"4", "5", "6"},
                         {"7", "8", "9"}};
String[] cols = {"A","B","C"};

public Test()
{
panel = new JPanel();
getContentPane().add(panel);

DefaultTableModel TestTable = new DefaultTableModel(data, cols);
 
ActionHandler aHandler = new ActionHandler();
 

panel.setLayout(new GridLayout(1,2));
table1 = new JTable(TestTable);
table1.setVisible(false);
 
panel.add(table1);
table1.addComponentListener(this);

button1.addActionListener(aHandler);
panel.add(button1);
 
setSize(300,300);
pack();

setVisible(true);
}

 public void componentShown(ComponentEvent e)
{
System.out.println("Table Shown");
}

 public void componentResized(ComponentEvent e)
{
}
 
public void componentMoved(ComponentEvent e)
{
}
 public void componentHidden(ComponentEvent e)
{
}

public class ActionHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == button1)
{
table1.setVisible(true);
}
}
}
 

public static void main(String args[])
{
new Test();
}
 
}  

[ August 17, 2005: Message edited by: Stephen Boston ]