Popup on JList????

Question

Hi,
I'm trying to add a right-click popup function
to a JList. Could someone help me?
Here is what I've done:
          JList clientList = new JList(new DefaultListModel());
          model = (DefaultListModel)clientList.getModel();
          clientList.setVisibleRowCount( 11 );
          clientList.setFixedCellWidth( 100 );
          clientList.setFixedCellHeight( 15 );
          clientList.setSelectionMode(
               ListSelectionModel.SINGLE_INTERVAL_SELECTION );
               // define a MouseListener for the window that displays
                  // a JPopupMenu when the popup trigger event occurs
               clientList.addMouseListener(
                   // anonymous inner class to handle mouse events
                   new MouseAdapter() {
                      // handle mouse press event
                      public void mousePressed( MouseEvent event )
                         checkForTriggerEvent( event );
                      // handle mouse release event
                      public void mouseReleased( MouseEvent event )
                         checkForTriggerEvent( event );
                      // determine whether event should trigger popup menu
                      private void checkForTriggerEvent( MouseEvent event )
                         if ( event.isPopupTrigger() )
                            popupMenu.show( event.getComponent(),
                               event.getX(), event.getY() );
                ); // end call to addMouseListenerWhen the user right-clicks on the JList, I want the popup to depend on
which item within the list had been right-clicked.
I don't know where to put the functionality to determine which item was clicked.
If you can help, could you please explain it using some sample code!
Thanks

Answer 1

The easiest way I know of to make a JList object responsive to right mouse clicks is first to get the Point of the click, then pass that Point to the locationToIndex method in the JList class. That method returns the index of the JList item that was under the mouse click. Once you have the index, you can then programmatically select the item in the JList with the setSelectedIndex method. Sample code follows:
     private class MouseTracker extends MouseAdapter
          public void mouseReleased(MouseEvent me)
               if (me.isPopupTrigger())
                    Point p = me.getPoint();
                    int index = list.locationToIndex(p);
                    list.setSelectedIndex(index);
                    popupMenu.show(me.getComponent(),p.x,p.y);
               }//end if
          }//end mouseReleased
     };//end inner class