protected override void WriteHtml(HtmlTextWriter writer)
{
var builder = new TreeViewHtmlBuilder(this);
IHtmlNode treeViewTag = builder.TreeViewTag();
if (Items.Any())
{
if (SelectedIndex != -1 && Items.Count < SelectedIndex)
{
throw new ArgumentOutOfRangeException(Exceptions.IndexOutOfRange);
}
//this loop is required because of SelectedIndex feature.
if (HighlightPath)
{
Items.Each(HighlightSelectedItem);
}
Items.Each((item, index) =>
{
if (!this.isPathHighlighted)
{
if (index == this.SelectedIndex)
{
item.Selected = true;
if (item.Items.Any() || item.Template.HasValue())
{
item.Expanded = true;
}
}
}
if (item.HasChildren)
{
item.Expanded = false;
}
if (ExpandAll)
{
ExpandAllChildrens(item);
}
if (string.IsNullOrEmpty(item.Id))
{
item.Id = item.Text;
}
WriteItem(item, treeViewTag.Children[0], builder);
});
}
treeViewTag.WriteTo(writer);
base.WriteHtml(writer);
}
private void WriteItem(TreeViewItem item, IHtmlNode parentTag, TreeViewHtmlBuilder builder)
{
if (ItemAction != null)
{
ItemAction(item);
}
if (item.Visible)
{
var accessible = true;
if (this.SecurityTrimming.Enabled)
{
accessible = item.IsAccessible(Authorization, ViewContext);
}
if (accessible)
{
var hasAccessibleChildren = item.Items.Any(x => x.Visible);
if (hasAccessibleChildren && this.SecurityTrimming.Enabled)
{
hasAccessibleChildren = item.Items.IsAccessible(Authorization, ViewContext);
if (this.SecurityTrimming.HideParent && !hasAccessibleChildren)
{
return;
}
}
IHtmlNode itemTag = builder.ItemTag(item, hasAccessibleChildren).AppendTo(parentTag);
builder.ItemInnerContent(item).AppendTo(itemTag.Children[0]);
if (item.Template.HasValue())
{
builder.ItemContentTag(item).AppendTo(itemTag);
}
else if (hasAccessibleChildren)
{
IHtmlNode ul = builder.ChildrenTag(item).AppendTo(itemTag);
item.Items.Each(child => WriteItem(child, ul, builder));
}
}
}
}