Re: how can i set center

From:
"Michael Rauscher" <michael.rauscher@THRWHITE.remove-dii-this>
Newsgroups:
comp.lang.java.gui
Date:
Wed, 27 Apr 2011 15:29:19 GMT
Message-ID:
<eou24l$gb0$1@registered.motzarella.org>
  To: comp.lang.java.gui
ashwinijain schrieb:

Michael Rauscher wrote:

ashwinijain schrieb:

Michael Rauscher wrote:

ashwinijain schrieb:

hi, i am using a jtable for making some calculation and i want to set
the center alignment of last column.
But i really dont know how to set it?
Please help me out...
I used following method but it works for all columns..
((JLabel)tab1.getDefaultRenderer(String.class)).setHorizontalAlignment
(JLabel.CENTER);

And i want to set alignment for last column only.


There are different methods to do what you want to be done :)

The most simple should be to override JTable#getCellRenderer, e. g.

JTable myTable = new JTable(myModel) {
     public TableCellRenderer getCellRenderer( int row, int col ) {
         TableCellRenderer renderer = super.getCellRenderer(row,col);
         if ( col == dataModel.getColumnCount() - 1 )
             renderer.setHorizontalAlignment( SwingConstants.CENTER );
         return renderer;
     }
};

Bye
Michael

Thanks but its giving me error that "setHorizontalAlignment(int) is
undefined for renderer.

Sorry, I forgot to cast. Change the above to:

       TableCellRenderer renderer = super.getCellRenderer(row,col);

       int alignment = (col == dataModel.getColumnCount() - 1) ?
               SwingConstants.CENTER : SwingConstants.LEFT;

       ((JLabel)renderer).setHorizontalAlignment( alignment );
       return renderer;

Should work (but not tested).

Bye
Michael


Thank you very much, its working.
But you know now what has happened. i am already applying one cell
renderer to my table so ur code giving error "class cast exception"


Sure :)

Of course, you could define a DefaultTableCellRenderer in your JTable
and return it for the appropriate column(s).

I don't like extending Swing components. Usually it's unneccesary - so
it is here.

The key is to implement a more flexible and reusable solution. Perhaps
you start off with a simple implementation of a cell renderer that
delegates to other renderers - something like this (untested (perhaps
pseudo) code):

public class ColumnAwareCellRenderer extends DefaultTableCellRenderer {
     private Map<Integer, TableCellRenderer> delegates =
             new HashMap<Integer, TableCellRenderer>();

     public void setColumnRenderer( int col, TableCellRenderer r ) {
         delegates.put( col, r );
     }

     public Component getTableCellRendererComponent( JTable table,
             Object value, boolean sel, boolean focus,
             int row, int col ) {
         TableCellRenderer renderer = delegates.get(col);
         if ( renderer == null )
             renderer = this;

         return renderer.getTableCellRendererComponent(table, value,
                 sel, focus, row, col );
     }
}

Using a ColumnAwareCellRenderer as a table's default cell renderer you
can use different renderers for different columns.

Note that this is a very basic implementation. You could extend it, of
course. E. g. you could separate the delegates from the renderer by
specifying an interface and so on. You could extend it so that you can
specify a renderer per cell. You could...

HTH
Michael

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