Right-click in a JList and associated action

From:
Hendrik Maryns <gtw37bn02@sneakemail.com>
Newsgroups:
comp.lang.java.help
Date:
Tue, 03 Jun 2008 14:49:28 +0200
Message-ID:
<g23ekp$4mg$1@newsserv.zdv.uni-tuebingen.de>
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Hi all,

I have a little Swing app which has as its main area a JList containing
formulas. It is possible to edit a formula through an edit menu and I
want to provide this menu if the use right-clicks on a formula.

After creating the edit menu and adding it to the menubar, I ask for its
popup menu with editMenu.getPopupMenu() and added the following to the
JList (result is the JList being constructed):

// mouse listener listens for double click to invoke the edit action and
// for popup action to show the edit menu
// as a popup
result.addMouseListener(new MouseAdapter() {

~ @Override
~ public void mousePressed(final MouseEvent e) {
~ this.maybeShowPopup(e);
~ }

~ @Override
~ public void mouseReleased(final MouseEvent e) {
~ this.maybeShowPopup(e);
~ }

~ @Override
~ public void mouseClicked(final MouseEvent e) {
~ if (e.getButton() == MouseEvent.BUTTON1 && e.getClickCount() == 2) {
~ editAction.actionPerformed(new ActionEvent(this,
ActionEvent.ACTION_FIRST, "double click"));
~ }
~ }

~ private void maybeShowPopup(final MouseEvent e) {
~ if (e.isPopupTrigger()) {
~ editPopup.show(result, e.getX(), e.getY());
~ }
~ }
});

It is a bit strange to have maybeShowPopup twice, but that is necessary
as documented in
<http://java.sun.com/javase/6/docs/api/java/awt/event/MouseEvent.html#isPopupTrigger()>.

The problem is, that the actions in the edit menu rely on the active
formula being selected. When doing a right click, the formula below the
right click is not selected, so the actions do the wrong things. How
can I tell the JList to also select the formula with a right-click,
*before* showing the popup menu?

You can ignore mouseClicked, it invokes another action, which works fine.
Thanks, H.
- --
Hendrik Maryns
http://tcl.sfs.uni-tuebingen.de/~hendrik/
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