Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

(DefaultTreeCellRenderer)jTree1.getCellRenderer();
renderer.setLeafIcon(yourCustomLeafImageIcon);
renderer.setOpenIcon(yourCustomOpenImageIcon);
renderer.setClosedIcon(yourCustomClosedImageIcon);
renderer.setBackgroundSelectionColor(Color.red);
NOTE: The default leaf, open icon, and closed icon are
dependent on the look-and-feel. For instance, on Windows
look-and-feel, the open icon is - and the closed icon is
+.
JTree comes with a default cell editor. If JTree's editable
property is true, the default editor activates a text field for
editing when the node is clicked three times. By default, this
property is set to false. To create a custom editor, you need to
extend the DefaultCellEditor class, which is the same class you
used in table cell editing. You can use a text field, a check
box, or a combo box, and pass it to DefaultCellEditor's
constructor to create an editor. The following code uses a combo
box for editing colors. The combo box editor is shown in Figure
40.30a.
// Customize editor
JComboBox jcboColor = new JComboBox();
jcboColor.addItem("red");
jcboColor.addItem("green");
jcboColor.addItem("blue");
jcboColor.addItem("yellow");
jcboColor.addItem("orange");
jTree1.setCellEditor(new javax.swing.DefaultCellEditor(jcboColor));
jTree1.setEditable(true);
(a)
(b)
Figure 40.30
You can supply a custom editor for editing tree nodes.
There are two annoying problems with the editor created in the
preceding code. First, it is activated with just one mouse click.
Second, it overlaps the node's icon, as shown in Figure 40.30a.
These two problems can be fixed by using the
DefaultTreeCellEditor, as shown in the following code:
jTree1.setCellEditor
(new javax.swing.tree.DefaultTreeCellEditor(jTree1,
new javax.swing.tree.DefaultTreeCellRenderer(),
new javax.swing.DefaultCellEditor(jcboColor)));
The new editor is shown in Figure 40.30b. Editing using
DefaultTreeCellEditor starts on a triple mouse click. The combo
box does not overlap the node’s icon.
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