🚀 go-pugleaf

In article <7nefpl$so06@forums.borland.com>, slneo@cybergal.com says...
> Hi,
> 
> How do we know that the user is switching to another tab on the JTabbedPane?
> I need to do some checking before I can allow the user to do this, and if
> necessary, disallow the switching of tab.
> 
> --
> Thanks for any help given
> 
> Lois
> 
> 
> 
You can't do it ahead of time.  All you can do is catch it after the 
fact using the state changed event, test to make sure it is ok, and 
switch it back prior to giving the user a message.  This actually happens 
such that no tab switching is perceived, at least in my apps:

void conControlPanel_stateChanged(ChangeEvent e)
{
   Frame frameObj = null;
   if ( (conControlPanel.getSelectedIndex() == SQL_PANEL) && 
        !connectBean.isConnected())
      {
         // Don't allow access to the Query panel if we are not connected
         // to a DB.
         conControlPanel.setSelectedIndex( CONNECT_PANEL );
         frameObj = RDUtils.getFirstFrame(this);
         if (( frameObj != null ))
         {
            JOptionPane.showMessageDialog(frameObj,
                  "You must be connected to a database \n" +
                  "before entering a query.",
                  "Not Connected to Database!",
                  JOptionPane.OK_OPTION,
                  null);

         }
      }
   }
}

Tad Frysinger (TeamB)