September 1998
Intermediate to advanced
1258 pages
42h 57m
English
Content preview from Java Swing
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The JMenu Class
The JMenu
class represents the anchored menus that are attached to a
JMenuBar or another JMenu.
Menus that are directly attached to a menubar are called
top-level menus. Submenus, on the other hand,
are not attached to a menubar but instead to an already existing menu
item that serves as its title. This menu item title is typically
marked by a right arrow, indicating that its menu will appear
alongside the menu item if the user selects it. See Figure 14.11.
Figure 14-11. Top-level menus and submenus
JMenu is a curious class. It contains a
MenuUI delegate, but it uses a
ButtonModel for its data model. To see why this is
the case, it helps to visualize a menu as two components: a menu item
and a popup menu. The menu item serves as the title. When it is
pressed, it signals the popup menu to show itself either below or
directly to the right of the menu item. JMenu
actually extends the JMenuItem class, which makes
it possible to implement the title portion of the menu. This, in
effect, makes it a specialized button. Remember that you can use the
mnemonic property of the
JMenuItem superclass to define the shortcut for
the menu’s title, and consequently the menu. In addition, you
can use the enabled property of
JMenuItem to disable the menu if desired.
As with popup menus, you can add or insert
JMenuItem, Component, or
Action objects to the popup portion of the menu by ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.