how do i add a JPopupMenu to a JList component?

Question

when i select an item in a jlist, then right clicking it will show the popup menu. how do i implement this in java?

Answer 1

Use "addMouseListener()". You have to check for isPopupTrigger on both mousePressed() and mouseReleased(), because some operating systems expect to do pop-up menus on button-down and others on button-up:

jProjList.addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if ( e.isPopupTrigger() && e.getClickCount() == 1 )
ConfigToolGUI.this. showProjMenu( e );
}
public void mousePressed(MouseEvent e) {
if ( e.isPopupTrigger() && e.getClickCount() == 1 )
ConfigToolGUI.this. showProjMenu( e );
} }
);

=========================
ShowProjMenu() actually brings up the pop-up and looks like this:

JPopupMenu menu = new JPopupMenu();
JMenuItem menuItem;
menuItem = new JMenuItem( "Create New Project ..." );
menuItem.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent ev) {
// here's the code you want activated
// when that menu pick is selected
} } );
menu.add( menuItem );
[... and several more items...]
menu.show( e.getComponent(), e.getX(), e.getY() );