我需要在一个JMenu
中找到特定的JMenuItem
的索引,以便我可以编程地在其前面insert()
一个新的JMenuItem
。我该如何做呢?
JPopupMenu popup = new JPopupMenu();
popup.setName("popup");
JMenu jMenu= new JMenu("menu");
jMenu.setName("menu");
JMenuItem menuItem1 = new JMenuItem("sub1");
jMenu.add(menuItem1);
menuItem1.addActionListener(this);
popup.add(jMenu);
....
@Override
public void actionPerformed(ActionEvent e) {
JMenuItem source = (JMenuItem)(e.getSource());
try{
JMenuItem menuItem = (JMenuItem) e.getSource();
JPopupMenu popupMenu = (JPopupMenu) menuItem.getParent();
Component invoker = popupMenu.getInvoker();
// Print MenuItem index against the total number of items
System.out.println(popupMenu.getComponentZOrder(menuItem)+"/"+popupMenu.getComponentCount());
}catch(Exception ex){
ex.printStackTrace();
}
}
for(int i = 0; i < jmenu.getMenuComponents().length; i++){
if(jMenu.getMenuComponent(i) == jMenuItem ){
// so that i is index here...
}
}
这里 jMenuItem 是 e.getSource()
Class#method
而不是Class.method
?这是某种约定吗? - Aviv Cohn