April 1997
Intermediate to advanced
1074 pages
22h 46m
English
Content preview from Java AWT Reference
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10
Would You Like to Choose from the Menu?
In this chapter:
- MenuComponent
- MenuContainer
- MenuShortcut
- MenuItem
- Menu
- CheckboxMenuItem
- MenuBar
- Putting It All Together
- PopupMenu
In Chapter 6, Containers, I mentioned that a Frame can have a menu. Indeed, to offer a menu in the AWT, you have to attach it to a Frame. With versions 1.0.2 and 1.1, Java does not support menu bars within an applet or any other container. We hope that future versions of Java will allow menus to be used with other containers. Java 1.1 goes partway toward solving this problem by introducing a PopupMenu that lets you attach context menus to any Component. Java 1.1 also adds MenuShortcut events, which represent keyboard accelerator events for menus.
Implementing a menu in a Frame involves connections among a number of different objects: MenuBar, Menu, MenuItem, and the optional CheckboxMenuItem. Several of these classes implement the MenuContainer interface. Once you've created a few menus, you'll probably find the process quite natural, but it's hard to describe until you see what all the objects are. So this chapter describes most of the menu classes first and then shows an example demonstrating their use.
All the components covered in previous chapters were subclasses of Component. Most of the objects in this chapter subclass MenuComponent, which encapsulates the common functionality of menu objects. The MenuComponent class hierarchy is shown in Figure 10-1.
To display a Menu, you must first put it in a ...
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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.