private TreeNode FindTreeNode(TreeNode theTreeNode, TreeNodeTag theRepresentingTreeNodeTag)
{
TreeNode theTreeNodeToFind = null;
TreeNodeTag theTreeNodeTag = (TreeNodeTag)theTreeNode.Tag;
if (theTreeNodeTag.IsRepresentingSame(theRepresentingTreeNodeTag))
{
theTreeNodeToFind = theTreeNode;
}
else
{
foreach (TreeNode subTreeNode in theTreeNode.Nodes)
{
theTreeNodeToFind = FindTreeNode(subTreeNode, theRepresentingTreeNodeTag);
if (theTreeNodeToFind != null)
{
break;
}
}
}
return(theTreeNodeToFind);
}
/// <summary>
/// Expand the supplied node and sub nodes back if they were expanded before.
/// </summary>
/// <param name="theTreeNode">The tree node.</param>
public void RestoreExpandInformation(TreeNode theTreeNode)
{
TreeNodeTag theTreeNodeTagForCurrentNode = (TreeNodeTag)theTreeNode.Tag;
TreeNodeTag theFoundTreeNodeTag = null;
// Find out if the node was previously expanded.
foreach (TreeNodeTag theTreeNodeTag in _TagsOfExpandedNodes)
{
if (theTreeNodeTagForCurrentNode.IsRepresentingSame(theTreeNodeTag))
{
theFoundTreeNodeTag = theTreeNodeTag;
break;
}
}
// If this node was expanded, expand it back.
if (theFoundTreeNodeTag != null)
{
theTreeNode.Expand();
_TagsOfExpandedNodes.Remove(theFoundTreeNodeTag);
}
// Do the same for all sub nodes.
foreach (TreeNode subTreeNode in theTreeNode.Nodes)
{
RestoreExpandInformation(subTreeNode);
}
}
/// <summary>
/// If nodes exist:
/// 1. Try to select the node with the same representing tag.
/// 2. If this fails, find the session node with the same session as the tag.
/// 3. If this fails, select the first session node.
/// </summary>
/// <param name="theTreeView"></param>
public void RestoreSelectedNode(TreeView theTreeView)
{
TreeNode theTreeNodeToSelect = null;
if (theTreeView.Nodes.Count > 0)
{
// 1. Try to select the node with the same representing tag.
foreach (TreeNode theSessionNode in theTreeView.Nodes)
{
theTreeNodeToSelect = FindTreeNode(theSessionNode, _TagOfSelectedNode);
if (theTreeNodeToSelect != null)
{
break;
}
}
// 2.If this fails, find the session node with the same session as the tag.
if (theTreeNodeToSelect == null)
{
foreach (TreeNode theSessionNode in theTreeView.Nodes)
{
TreeNodeTag theSessionTreeNodeTag = (TreeNodeTag)theSessionNode.Tag;
if (theSessionTreeNodeTag.IsRepresentingSame(_TagOfSelectedNode))
{
theTreeNodeToSelect = theSessionNode;
break;
}
}
}
// 3. If this fails, select the first session node.
if (theTreeNodeToSelect == null)
{
theTreeNodeToSelect = theTreeView.Nodes[0];
}
theTreeView.SelectedNode = theTreeNodeToSelect;
}
_TagOfSelectedNode = null;
}