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Java Swing, 2nd Edition
book

Java Swing, 2nd Edition

by Dave Wood, Robert Eckstein, Marc Loy, James Elliott, Brian Cole
November 2002
Intermediate to advanced content levelIntermediate to advanced
1278 pages
38h 26m
English
O'Reilly Media, Inc.
Content preview from Java Swing, 2nd Edition

The JPopupMenu Class

Pop-up menus are an increasingly popular user-interface feature. These menus are not attached to a menu bar; instead, they are free-floating menus that associate themselves with an underlying component. This component is called the invoker . Linked to specific interface elements, pop-up menus are nicely context-sensitive. They are brought into existence by a platform-dependent pop-up trigger event that occurs while the mouse is over the invoking component. In AWT and Swing, this trigger is typically a mouse event. Once raised, the user can interact with the menu normally. Figure 14-9 is an example of a pop-up menu in Swing.

A pop-up menu in Swing

Figure 14-9. A pop-up menu in Swing

You can add or insert JMenuItem, Component, or Action objects to the pop-up menu with the add( ) and insert( ) methods. The JPopupMenu class assigns an integer index to each menu item and orders them based on the layout manager of the pop-up menu. In addition, you can add separators to the menu by using the addSeparator( ) method; these separators also count as an index. Figure 14-10 shows the class diagram for the JPopupMenu component. Starting with SDK 1.4, pop-up menus use the Popup class to actually draw themselves. This class is also used for other briefly displayed interface elements like tooltips.

Figure 14-10. JPopupMenu class diagram

Displaying the Pop-up Menu

Pop-up menus are usually raised by ...

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Publisher Resources

ISBN: 0596004087Errata PageSupplemental Content