The challenging thing about this is that the TreeNode class has no get
child method, making it problematic to do a tree traversal. The only way to
get a child of TreeNode is by calling:
TreeNode childNode = treeNode.setChildOpen(i, treeNode.isChildOpen(i));
Since you're making the call with the open status it's already set to, the
call has absolutely no effect, except that it returns the child. Why the
creators of this class didn't add a getChild method is beyond me. Despite
it's MANY problems, it's one of the better options I've seen.
Here's my complete solution. These methods are inside a class that extends
CellTree:
public void refresh() {
Map<Object,Boolean> openMap = new HashMap<Object,Boolean>();
TreeNode root = getRootTreeNode();
getNodeOpenMap(root, openMap);
openMap.put(root, true);
refresh(root, openMap);
}
private void getNodeOpenMap(TreeNode treeNode, Map<Object,Boolean>
openMap) {
if (treeNode == null) {
return;
}
for (int i = 0, n = treeNode.getChildCount(); i < n; ++i) {
if (null == treeNode.getChildValue(i) ||
treeNode.isChildLeaf(i)) {
continue;
}
openMap.put(treeNode.getChildValue(i), treeNode.isChildOpen(i));
// This gets the child node, but doesn't change the open status
(there's no other way to get the child).
TreeNode childNode = treeNode.setChildOpen(i,
treeNode.isChildOpen(i));
getNodeOpenMap(childNode, openMap);
}
}
public void refresh(TreeNode treeNode, Map<Object,Boolean> openMap) {
if (treeNode == null) {
return;
}
for (int i = 0, n = treeNode.getChildCount(); i < n; ++i) {
if (null == treeNode.getChildValue(i) ||
treeNode.isChildLeaf(i)) {
continue;
}
treeNode.setChildOpen(i, false);
Boolean open = openMap.get(treeNode.getChildValue(i));
if (open != null && open) {
TreeNode childNode = treeNode.setChildOpen(i, true);
refresh(childNode, openMap);
}
}
}
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