Java Utililty Methods JTree

List of utility methods to do JTree

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Description

The list of methods to do JTree are organized into topic(s).

Method

voidapplyDefaultProperties(final JTree comp)
Sets default background and foreground color as well as a default font for the specified component. 
if (comp == null) {
    return;
applyProperties(comp, "Tree.background", 
        "Tree.foreground", 
        "Tree.font");
voidautoscroll(JTree tree, Point cursorLocation)
autoscroll 
Insets insets = DEFAULT_INSETS;
Rectangle outer = tree.getVisibleRect();
Rectangle inner = new Rectangle(outer.x + insets.left, outer.y + insets.top,
        outer.width - (insets.left + insets.right), outer.height - (insets.top + insets.bottom));
if (!inner.contains(cursorLocation)) {
    Rectangle scrollRect = new Rectangle(cursorLocation.x - insets.left, cursorLocation.y - insets.top,
            insets.left + insets.right, insets.top + insets.bottom);
    tree.scrollRectToVisible(scrollRect);
...
booleanautoScrollIsDesirable(JTree tree)

Determines whether a tree should be in auto scroll mode. 

boolean ret = false;
if (tree.getRowCount() < 1) {
    return ret;
Rectangle viewRect = tree.getVisibleRect();
int[] selected = tree.getSelectionRows();
boolean selectedIsVisible = false;
if (selected == null) {
...
voidclearTreeIcon(JTree tree)
clear Tree Icon 
DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
renderer.setOpenIcon(null);
renderer.setClosedIcon(null);
tree.setCellRenderer(renderer);
voidcorrectRowHeight(JTree tree)
Update tree row height to the best possible considering font size changes on the current platform http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4760081 
FontMetrics metrics = tree.getFontMetrics(tree.getFont());
tree.setRowHeight(Math.max(tree.getRowHeight(), metrics.getHeight()));
voiddisposeExpressionsTree()
dispose Expressions Tree 
frame.dispose();
voidenableAutoExpansion(final JTree tree)
Adds a TreeModelListener that will automatically expand the tree as new nodes are inserted. 
tree.getModel().addTreeModelListener(new TreeModelListener() {
    public void treeNodesChanged(TreeModelEvent e) {
    public void treeNodesInserted(TreeModelEvent e) {
        tree.expandPath(e.getTreePath());
    public void treeNodesRemoved(TreeModelEvent e) {
    public void treeStructureChanged(TreeModelEvent e) {
});
TreePathfindByName(JTree tree, String[] names)
find By Name 
TreeNode root = (TreeNode) tree.getModel().getRoot();
return find2(tree, new TreePath(root), names, 0, true);
JTreefindTree(Container container)
Traverse a container hierarchy and returns the first JMenuBar it finds. 
Component[] components = container.getComponents();
for (Component component : components) {
    if (component instanceof JTree) {
        return (JTree) component;
    } else if (component instanceof Container) {
        JTree tree = findTree((Container) component);
        if (tree != null) {
            return tree;
...
intgetCurrentWidth(JTree tree, int row)
get Current Width 
return tree.getSize().width - 100;