private void removeNodeFromParent(DefaultMutableTreeNode node) {
TreeNode parent = node.getParent();
int idx = parent.getIndex(node);
node.removeFromParent();
(getModel()).nodesWereRemoved(parent, new int[] {idx}, new TreeNode[] {node});
}
private boolean isMovingAvailable(final CheckedTreeNode toolNode, Direction dir) {
TreeNode parent = toolNode.getParent();
int index = parent.getIndex(toolNode);
return dir.isAvailable(index, parent.getChildCount());
}