Re: JButton Action Listeners Events

From:
Sabine Dinis Blochberger <no.spam@here.invalid>
Newsgroups:
comp.lang.java.gui
Date:
Mon, 29 Sep 2008 09:56:27 +0100
Message-ID:
<tKidnd1l0_WhBX3VnZ2dnUVZ8qjinZ2d@novis.pt>
Sriram wrote:

Hi all

     I have a question regarding action events... Is it possible for a
button to have multiple events generated??...

 
You should be able to register as many listeners on a component as you
want. That will in effect give you X repetitions of the event.

I have been wanting to
generate two events from clicking a single button ..My following
sample code has the Add Row button and Up button that generates
separate events but I would like a single Up button to generate adding
a row below as well as insertion of a row if there are entries say
between table cells A and C it should insert a cell in between
(functionality like Excel)......

How do I do this? Pls help!!

       button = new JButton( "Add Row" );
       buttonPanel.add( button );
       button.addActionListener( new ActionListener()
       {
        public void actionPerformed(ActionEvent e)
        {
          model.addRow( createRow() );
          int row = table.getRowCount() - 1;
          table.getColumnModel().getColumn(4).setCellEditor(new
DefaultCellEditor(comboBox));
                  table.changeSelection(row, 0, false, false);
          table.requestFocusInWindow();
       }
       });

       //

                button = new JButton( "Up" );
       buttonPanel.add( button );
       button.addActionListener( new ActionListener()
       {
        public void actionPerformed(ActionEvent e)
        {
           int row=table.getSelectedRow();
           model.insertRow(row, createRow() );
           table.changeSelection(0, 0, false, false);
           table.requestFocusInWindow();
        }
       });


Does this code not work? What is the error or unexpected behaviour?

You can create a custom ActionListener in a class, so you can re-use the
instance (i.e. register the instance mu?tilpe times). You can also call
the ActionListener from the other button IIRC.

In any case, read up on the following:
<http://java.sun.com/docs/books/tutorial/uiswing/events/intro.html>
<http://java.sun.com/docs/books/tutorial/uiswing/events/actionlistener.html>

--
Sabine Dinis Blochberger

Op3racional
www.op3racional.eu

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