public static List<TreePath> collectExpandedPaths(final JTree tree, TreePath path) {
final ArrayList<TreePath> result = new ArrayList<TreePath>();
if (!tree.isExpanded(path)) return result;
final Object lastPathComponent = path.getLastPathComponent();
final TreeModel model = tree.getModel();
if (model.isLeaf(lastPathComponent)) {
result.add(path);
} else {
boolean pathWasAdded = false;
for (int i = model.getChildCount(lastPathComponent) - 1; i >= 0; i--) {
final TreePath childPath = path.pathByAddingChild(model.getChild(lastPathComponent, i));
if (model.isLeaf(lastPathComponent)) {
if (!pathWasAdded) {
result.add(path);
pathWasAdded = true;
}
} else if (tree.isExpanded(childPath)) {
result.addAll(collectExpandedPaths(tree, childPath));
} else {
if (!pathWasAdded) {
result.add(path);
pathWasAdded = true;
}
}
}
}
return result;
}
private static boolean collectExpandedPathsImpl(
final JTree tree, final Collection<TreePath> paths, final TreePath path) {
final TreeModel model = tree.getModel();
final Object lastPathComponent = path.getLastPathComponent();
if (model.isLeaf(lastPathComponent)) {
return false;
}
boolean hasExpandedChildren = false;
for (int i = model.getChildCount(lastPathComponent) - 1; i >= 0; i--) {
hasExpandedChildren |=
collectExpandedPathsImpl(
tree, paths, path.pathByAddingChild(model.getChild(lastPathComponent, i)));
}
if (!hasExpandedChildren) {
paths.add(path);
return true;
} else {
return false;
}
}
@Nullable
public static Range<Integer> getExpandControlRange(final JTree aTree, final TreePath path) {
TreeModel treeModel = aTree.getModel();
final BasicTreeUI basicTreeUI = (BasicTreeUI) aTree.getUI();
Icon expandedIcon = basicTreeUI.getExpandedIcon();
Range<Integer> box = null;
if (path != null && !treeModel.isLeaf(path.getLastPathComponent())) {
int boxWidth;
Insets i = aTree.getInsets();
if (expandedIcon != null) {
boxWidth = expandedIcon.getIconWidth();
} else {
boxWidth = 8;
}
int boxLeftX = i != null ? i.left : 0;
boolean leftToRight = aTree.getComponentOrientation().isLeftToRight();
int depthOffset = getDepthOffset(aTree);
int totalChildIndent = basicTreeUI.getLeftChildIndent() + basicTreeUI.getRightChildIndent();
if (leftToRight) {
boxLeftX +=
((path.getPathCount() + depthOffset - 2) * totalChildIndent
+ basicTreeUI.getLeftChildIndent())
- boxWidth / 2;
}
int boxRightX = boxLeftX + boxWidth;
box = new Range<Integer>(boxLeftX, boxRightX);
}
return box;
}