/**
* Add a JMenuItem (or JMenu) to the end of this JMenu.
*
* @return the JMenuItem that was added.
*/
public JMenuItem add(JMenuItem item_) {
_menuItems.add(item_);
if (item_ instanceof JMenu) {
((JMenu) item_).setParentMenu(this);
}
return item_;
}
/**
* Displays this menu's popup menu if the specified value is true; hides the menu if it is false.
*/
public void setPopupMenuVisible(boolean visible_) {
_popupMenuVisible = visible_;
if (!visible_) {
_popup.hide();
return;
}
if (_popup == null) _popup = new JPopupMenu(_menuItems);
Point p;
if (!this.isTopLevelMenu()) {
/* If this menu is a submenu (i.e. it is not a direct
* child of the menubar), check if there is enough
* space on the right hand side of the parent menu.
* If there is not enough space, position it on the
* left of the parent menu.
*/
JMenu parentmenu = (JMenu) getParentMenu();
JPopupMenu parentpopup = parentmenu.getPopupMenu();
p = parentpopup.getLocation();
int verticalOffset = parentpopup.getComponentIndex(this);
_popup.setInvoker(parentpopup);
int parentwidth = parentpopup.getSize().width;
Toolkit term = Toolkit.getDefaultToolkit();
if (p.x + parentwidth + _popup.getWidth() < term.getScreenColumns()) {
_popup.setLocation(p.addOffset(parentwidth - 1, verticalOffset));
} else {
_popup.setLocation(p.addOffset(-_popup.getWidth() + 1, verticalOffset));
}
} else {
JMenuBar parentMenuBar = (JMenuBar) getParent();
p = parentMenuBar.getPopupMenuLocation(this);
_popup.setInvoker(parentMenuBar);
_popup.setLocation(p);
}
_popup.show();
}