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Java Swing, 2nd Edition
book

Java Swing, 2nd Edition

by Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
November 2002
Intermediate to advanced
1280 pages
38h 26m
English
O'Reilly Media, Inc.
Content preview from Java Swing, 2nd Edition

Menu Bar Selection Models

In all GUI environments, menu components allow only one selection to be made at a time. Swing is no exception. Swing provides a data model that menu bars and menus can use to emulate this behavior: the SingleSelectionModel.

The SingleSelectionModel Interface

Objects implementing the SingleSelectionModel interface do exactly what its name suggests: they maintain an array of possible selections and allow one element in the array to be chosen at a time. The model holds the index of the selected element. If a new element is chosen, the model resets the index representing the chosen element and fires a ChangeEvent to each of the registered listeners.

Properties

Objects implementing the SingleSelectionModel interface contain the properties shown in Table 14-1. The selected property is a boolean that tells if there is a selection. The selectedIndex property is an integer index that represents the currently selected item.

Table 14-1. SingleSelectionModel properties

Property

Data type

get

is

set

Default value

selected

boolean

 

·

  

selectedIndex

int

·

 

·

 

Events

Objects implementing the SingleSelectionModel interface must fire a ChangeEvent (not a PropertyChangeEvent) when the object modifies its selectedIndex property, i.e., when the selection has changed. The interface contains the standard addChangeListener( ) and removeChangeListener( ) methods for maintaining a list of ChangeEvent listeners.

void addChangeListener(ChangeListener listener)void removeChangeListener(ChangeListener ...
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Publisher Resources

ISBN: 0596004087Errata Page