/// <summary>
/// Add the children nodes of a particular node in the tree.
/// While adding nodes if a match is found for objToSelect then nodeRepresentingCurrentChoice assigned to it
/// and is returned. Otherwise if no node in the tree matches objToSelect this method returns null.
/// </summary>
public virtual LabelNode AddChildrenAndLookForSelected(ICmObject objToSelect,
Stack <ICmObject> ownershipStack, IEnumerable <ICmObject> chosenObjs)
{
LabelNode nodeRepresentingCurrentChoice = null;
// JohnT: if this.Nodes[0] is not a LabelNode, it is a dummy node we added so that
// its parent LOOKS like something we can expand. That is the usual case for a node
// we can expand. Therefore finding one of those, or finding more or less than one
// node, is evidence that we haven't previously computed the real children of this,
// and should do so.
bool fExpanded = Nodes.Count != 1 || (Nodes[0] as LabelNode) != null;
if (!fExpanded)
{
Nodes.Clear();
nodeRepresentingCurrentChoice = AddSecondaryNodesAndLookForSelected(this,
Nodes, nodeRepresentingCurrentChoice, objToSelect, ownershipStack, chosenObjs);
foreach (ObjectLabel label in ((ObjectLabel)Tag).SubItems)
{
if (!WantNodeForLabel(label))
{
continue;
}
LabelNode node = Create(label, m_stylesheet, m_displayUsage);
if (chosenObjs != null)
{
node.Checked = chosenObjs.Contains(label.Object);
}
Nodes.Add(node);
nodeRepresentingCurrentChoice = CheckForSelection(label, objToSelect,
node, nodeRepresentingCurrentChoice);
nodeRepresentingCurrentChoice = AddSecondaryNodesAndLookForSelected(
node, node.Nodes, nodeRepresentingCurrentChoice, objToSelect,
ownershipStack, chosenObjs);
}
}
else
{
// Even if we don't have to create children for this, we need to search the
// children for matches, and perhaps expand some of them.
foreach (LabelNode node in Nodes)
{
nodeRepresentingCurrentChoice = CheckForSelection(node.Label,
objToSelect, node, nodeRepresentingCurrentChoice);
}
}
if (nodeRepresentingCurrentChoice == null)
{
foreach (LabelNode node in Nodes)
{
if (ownershipStack.Contains(node.Label.Object))
{
nodeRepresentingCurrentChoice = node.AddChildrenAndLookForSelected(
objToSelect, ownershipStack, chosenObjs);
return(nodeRepresentingCurrentChoice);
}
}
}
else
{
Expand();
nodeRepresentingCurrentChoice.EnsureVisible();
}
return(nodeRepresentingCurrentChoice);
}
