September 1998
Intermediate to advanced
1258 pages
42h 57m
English
Content preview from Java Swing
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Menu Bar Selection Models
In all GUI environments, menu components
only allow one selection to be made at a time. Swing is no exception.
Swing provides a data model that menubars and menus can use to
emulate this behavior: the SingleSelectionModel.
The SingleSelectionModel Interface
Objects implementing the
SingleSelectionModel interface do exactly what the
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 selectedIndex property
is an integer index that represents the currently selected item. The
selected property is a boolean
that tells if there is a selection.
Table 14-1. SingleSelectionModel Properties
|
Property |
Data Type |
get |
is |
set |
bound |
Default Value |
|---|---|---|---|---|---|---|
|
|
|
• | ||||
|
|
|
• |
• |
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 ...
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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.