static void ConfigureTreeViewNode(this GridViewRow row, IHierarchy item, Func <IHierarchy, bool> isItemCollapsed)
{
var parent = item.GetParent();
var isVisible = true;
if (parent != null)
{
isVisible = !isItemCollapsed(parent);
}
var isCollapsed = isItemCollapsed(item);
var isRoot = parent == null;
var isLeaf = item.GetChildren().None();
// setting up grid view row attributes
row.Attributes["itemid"] = item.GetId().ToString();
row.CssClass += " {0}{1}{2}{3}".FormatWith(
item.GetAllParents().Select(a => a.GetId()).ToString(" "),
" treeview-leaf-node".OnlyWhen(isLeaf),
" treeview-root-node".OnlyWhen(isRoot),
" collapsed".OnlyWhen(isCollapsed && !isLeaf));
if (!isVisible)
{
row.Style["display"] = "none";
row.Attributes["collapsedfor"] = parent.GetId().ToString();
}
// Creating additional controls
var spacerSpan = CreateSpacer(item.GetAllParents().Count());
var collapseIcon = CreateLink(item.GetId().ToString());
// putting additional controls in the right place
var anchorControl = FindAnchorControl(row);
var parentToAdd = anchorControl?.Parent ?? row.Cells[0];
var controlIndex = anchorControl == null ? 0 : parentToAdd.Controls.IndexOf(anchorControl);
parentToAdd.Controls.AddAt(controlIndex, collapseIcon);
parentToAdd.Controls.AddAt(controlIndex, spacerSpan);
}
/// <summary>
/// Adds a hierarchy of nodes for a specified hirarchical item.
/// </summary>
public static void Add(this TreeNodeCollection nodes, IHierarchy item)
{
var node = new TreeNode(item.Name, item.GetId().ToString());
foreach (var child in item.GetChildren())
{
node.ChildNodes.Add(child);
}
node.CollapseAll();
node.SelectAction = TreeNodeSelectAction.None;
nodes.Add(node);
}