/**
* Invoked after the tree has drastically changed structure from a given node down. If the path
* returned by e.getPath() is of length one and the first element does not identify the current
* root node the first element should become the new root of the tree.
*
* <p>e.path() holds the path to the node.
*
* <p>e.childIndices() returns null.
*/
public void treeStructureChanged(TreeModelEvent e) {
if (e != null) {
TreePath changedPath = SwingUtilities2.getTreePath(e, getModel());
FHTreeStateNode changedNode = getNodeForPath(changedPath, false, false);
// Check if root has changed, either to a null root, or
// to an entirely new root.
if (changedNode == root
|| (changedNode == null
&& ((changedPath == null && treeModel != null && treeModel.getRoot() == null)
|| (changedPath != null && changedPath.getPathCount() <= 1)))) {
rebuild(true);
} else if (changedNode != null) {
boolean wasExpanded, wasVisible;
FHTreeStateNode parent = (FHTreeStateNode) changedNode.getParent();
wasExpanded = changedNode.isExpanded();
wasVisible = changedNode.isVisible();
int index = parent.getIndex(changedNode);
changedNode.collapse(false);
parent.remove(index);
if (wasVisible && wasExpanded) {
int row = changedNode.getRow();
parent.resetChildrenRowsFrom(row, index, changedNode.getChildIndex());
changedNode = getNodeForPath(changedPath, false, true);
changedNode.expand();
}
if (treeSelectionModel != null && wasVisible && wasExpanded)
treeSelectionModel.resetRowSelection();
if (wasVisible) this.visibleNodesChanged();
}
}
}
/**
* Finds the next valid parent, this should be called when nextIndex is beyond the number of
* children of the current parent.
*/
protected boolean findNextValidParent() {
if (parent == root) {
// mark as invalid!
parent = null;
return false;
}
while (parent != null) {
FHTreeStateNode newParent = (FHTreeStateNode) parent.getParent();
if (newParent != null) {
nextIndex = parent.childIndex;
parent = newParent;
childCount = treeModel.getChildCount(parent.getUserObject());
if (updateNextIndex()) return true;
} else parent = null;
}
return false;
}
