Skip to Main Content
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

Tree Events

Trees generate three types of events worth mentioning. Apart from the obvious selection events (TreeSelectionEvent, TreeSelectionListener), you can receive expansion events (TreeExpansionEvent, TreeExpansionListener, TreeWillExpandListener) from the graphical side, and you can catch structural changes to the model itself (TreeModelEvent, TreeModelListener).

Figure 17-9 shows a simple program that uses the Every Event Listener (EEL) class (described in Chapter 3) to display all events that come from selecting, expanding, and editing a tree. (We use a tree built by the default JTree constructor.) For editing, you can change the text of a node or add and remove nodes so that you can monitor model events.

The JTree events as reported by our EEL utility

Figure 17-9. The JTree events as reported by our EEL utility

Here’s the source code required to hook up all the various events:

// TreeEvents.java // import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.tree.*; public class TreeEvents extends JFrame implements TreeSelectionListener { JButton addB, deleteB; JTree tree; DefaultMutableTreeNode leadSelection; public TreeEvents( ) { super("Tree Event Demo"); setSize(300,200); setDefaultCloseOperation(EXIT_ON_CLOSE); EEL eel = EEL.getInstance( ); eel.addGui( ); tree = new JTree( ); tree.setExpandsSelectedPaths(true); tree.setEditable(true); getContentPane( ).add(new JScrollPane(tree), ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Java Threads, 3rd Edition

Java Threads, 3rd Edition

Scott Oaks, Henry Wong

Publisher Resources

ISBN: 0596004087Errata PageSupplemental Content