Allow user to specify id for menu item

Originally by bootlaces

Hi,

I have a menu bar with lots of menu items. I wish to attach only one command object to each menu item and then in the body of menuSelected(final MenuItem selectedItem) to switch on either an index or an arbitrary value I pass in, i.e.,

private static final ADD = 1;
private static final DELETE = 2;

MenuItem main = addItem("Items", null, null);
main.addItem(ADD, "Add Item", null, command);
main.addItem(DELETE, "Delete Item", null, command);
...
...

command = new Command() {

@Override
public void menuSelected(final MenuItem selectedItem) {

switch(selectedItem.getIndex()) {
case ADD:
doSomethingWonderful();
break;
case DELETE:
doSomethingNotSoWonderful();
break;
}
}
}

This would be a great help. Otherwise, I have to do a string comparision, and since my application is I18N aware, it means doing a ResourceBundle lookup each time for the string...slooooow.

Thanks

-=bootlaces=-

Imported from https://dev.vaadin.com/ issue #3873

Start by locating the MenuItem and addItem entry points used in the example, then trace how menuSelected receives the selected item. Implement a way for callers to provide an arbitrary value and retrieve it from the selected item, so one command can distinguish ADD from DELETE without comparing localized labels.