September 1998
Intermediate to advanced
1258 pages
42h 57m
English
Content preview from Java Swing
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Tree Models
Looking at Figure 17.4 you can get an overview of
where all the tree pieces come from. As with many of the Swing
components you’ve seen already, the models supporting the data
for trees play a crucial role in making the component run. Two
interfaces are particularly important: TreeModel,
which describes how to work with tree data, and
TreeSelectionModel, which describes how to select
nodes. We’ll be looking at the model for the tree data first,
and later the model supporting tree selections.
The TreeModel Interface
To get started, you need a tree
model. The TreeModel interface is the starting
point for your model. You don’t have to start from scratch,
there is a default implementation you can subclass or just look at
for ideas. (We’ll look at this class,
DefaultTreeModel, later in the chapter.)
Property
The TreeModel has one root
property, listed in Table 17.1. This read-only
property designates the root of a tree: by definition, the
node that has no parent. All other nodes in your tree will be
descendants of this node.
Table 17-1. TreeModel Property
|
Property |
Data Type |
get |
is |
set |
bound |
Default Value |
|---|---|---|---|---|---|---|
|
|
|
• |
Events
The tree model uses the
TreeModelEvent
class defined in the
javax.swing.event package. A
TreeModelEvent indicates that the tree has been
changed; one or more nodes have been added, modified, or deleted. You
will find a more detailed discussion of the tree events in Table 17.9 later in this chapter.
- public void addTreeModelListener(TreeModelListener ...
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