Java Reference
In-Depth Information
public boolean isCellEditable(EventObject event) {
boolean returnValue = false;
if (event instanceof MouseEvent) {
MouseEvent mouseEvent = (MouseEvent)event;
TreePath path = tree.getPathForLocation(mouseEvent.getX(), mouseEvent.getY());
if (path != null) {
Object node = path.getLastPathComponent();
if ((node != null) && (node instanceof DefaultMutableTreeNode)) {
DefaultMutableTreeNode treeNode = (DefaultMutableTreeNode)node;
Object userObject = treeNode.getUserObject();
returnValue = ((treeNode.isLeaf()) &&
(userObject instanceof CheckBoxNode));
}
}
}
return returnValue;
}
public Component getTreeCellEditorComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row) {
Component editor = renderer.getTreeCellRendererComponent(tree, value, true,
expanded, leaf, row, true);
// Editor always selected / focused
ItemListener itemListener = new ItemListener() {
public void itemStateChanged(ItemEvent itemEvent) {
if (stopCellEditing()) {
fireEditingStopped();
}
}
};
if (editor instanceof JCheckBox) {
((JCheckBox)editor).addItemListener(itemListener);
}
return editor;
}
}
■
Note
Notice that there's no direct change of the data in the tree node. It's not the role of the editor to
change the node. The editor only gets the new node value, returning it with
getCellEditorValue()
.
