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How to show resize indicator when user want to resize Jtable header.

Posted on 2004-03-21
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Last Modified: 2008-01-16
Hi,
  I am using the swing to draw Jtable. But i am not able to get the resize poniter indicator when user put the mouse between edges of the two column header. I want to show a pointer so that user can understand that he can resize the column size.

regards

Ketan
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Comment
Question by:hello_kets
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LVL 9

Expert Comment

by:mmuruganandam
Comment Utility
Pass your TableColumn to the JTableHeader,

setResizingColumn(TableColumn aColumn)  all the columns that you need to resize.

This way, java by default takes care of showing that cursor.


Regards,
Muruga
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Author Comment

by:hello_kets
Comment Utility
Please can you send the code for this.
thanx in advance.

ketan
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Author Comment

by:hello_kets
Comment Utility
I used
*****************************
JTableHeader header = table.getTableHeader();
header.setResizingAllowed(true);

for(int i = 0; i < table.getColumnCount() ; i++)
{
     header.setResizingColumn(table.getColumnModel().getColumn(i));
}

******************************
but still it is not working.

Ketan
0
 
LVL 30

Expert Comment

by:mayankeagle
Comment Utility
As far as I know, you don't need to set it at all, because it is resizable by default. I guess you must be setting it to non-resizable or something. Have you set your JTable to enabled ( false ) or something like that? Can you post your updated code?
0
 
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Expert Comment

by:mayankeagle
Comment Utility
I tested some sample code for a JTable.... even if you set table.setEnabled ( false ), the columns are still resizable.
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LVL 30

Expert Comment

by:mayankeagle
Comment Utility
Have you used table.setAutoResizeMode () anywhere?
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LVL 30

Expert Comment

by:mayankeagle
Comment Utility
Try: table.setAutoResizeMode ( JTable.AUTO_RESIZE_ALL_COLUMNS ) ;

(I hope you are not doing table.setAutoResizeMode ( JTable.AUTO_RESIZE_OFF ) ; anywhere).
0
 
LVL 30

Expert Comment

by:mayankeagle
Comment Utility
See the JTable examples from the Java developer's almanac:

http://www.javaalmanac.com/cgi-bin/search/find.pl?words=JTable
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Author Comment

by:hello_kets
Comment Utility
Hi all,
  I think our subject is diverting. I am able to resize the columns but i want so show '<-->' between header edge. I have set the parameters like.

********
table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
table.setAutoCreateColumnsFromModel(false);
table.getTableHeader().setReorderingAllowed(false);
JTableHeader header = table.getTableHeader();
header.setResizingAllowed(true);
for(int i = 0; i < table.getColumnCount() ; i++)
{
     header.setResizingColumn(table.getColumnModel().getColumn(i));
}
********************************

Ketan

0
 
LVL 30

Expert Comment

by:mayankeagle
Comment Utility
I guess that if the columns are resizable then the user will be able to see the '<-->' between the header-edges of the columns. Try this sample code and tell me if it shows it to you the way you want:

import javax.swing.* ;
import java.awt.* ;
import java.awt.event.* ;

class JTableTest extends JPanel
{
      JTableTest () // constructor ()
      {
            JPanel jTablePanel = new JPanel ( new BorderLayout () ) ;
            String columnNames[] = {"Title","Author","Issued","Shelf No."};
            Object objArray[][] = new Object[1][4] ;

            objArray[0][0] = "A" ;
            objArray[0][1] = "B" ;
            objArray[0][2] = "C" ;
            objArray[0][3] = "D" ;

            final JTable jTabBook = new JTable ( objArray, columnNames ) ;
            jTabBook.setEnabled ( false ) ;
            jTabBook.setSelectionMode ( ListSelectionModel.SINGLE_SELECTION ) ;
            // jTabBook.setEnabled ( false ) ;
            JScrollPane scrollPane = new JScrollPane ( jTabBook ) ;
            jTablePanel.add ( scrollPane ) ;
            jTablePanel.setBackground ( Color.white ) ;
            add ( jTablePanel ) ;
            // show () ;

      } // end of constructor ()

      public static void main(String[] args)
      {
            JFrame jfMyFrame = new JFrame () ;
            jfMyFrame.getContentPane ().add ( new JTableTest () ) ;
            jfMyFrame.setSize ( 800, 600 ) ;
            jfMyFrame.show () ;

      } // end of main ()

} // class definition over
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Author Comment

by:hello_kets
Comment Utility
yes your code is working fine...
I have removed all the setting of the jtable but even then it is not showing the '<-->'.
0
 
LVL 30

Expert Comment

by:mayankeagle
Comment Utility
Post your code.
0
 

Author Comment

by:hello_kets
Comment Utility
Hi sorry...
i Got the answer. Actually i was setting

JScrollPane scrollPane = new JScrollPane ( jtesttable ) ;
jTablePanel.add ( scrollPane ) ;
jTablePanel.setEnabled(false);   /// Here was the problem.

when i removed the line 'jTablePanel.setEnabled(false);' its astred working.

thanx for the help.

Regards

Ketan
0
 
LVL 30

Expert Comment

by:mayankeagle
Comment Utility
That is why I posted that code ;-) so that you can see where you went wrong.
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Expert Comment

by:mayankeagle
Comment Utility
That is also why I asked: >> Have you set your JTable to enabled ( false ) or something like that?

Because setting your table's containing Panel to disabled would automatically mean that all things inside the panel (including the JTable) would be disabled.
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Accepted Solution

by:
mayankeagle earned 125 total points
Comment Utility
As a matter of fact, the reason why the resizing would be disabled will be because the table itself is disabled (because the panel is disabled). That is exactly what I aimed at when I said:

>> Have you set your JTable to enabled ( false ) or something like that?

And I also hope that my posting the other sample code helped the questioner in finding his mistake. Can I claim some points for this now?
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LVL 30

Expert Comment

by:mayankeagle
Comment Utility
Thanks, AI.
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