public Vector2 Render(ITreeview <TSource> treeview, EventType eventType)
{
if (treeview == null)
{
throw new ArgumentNullException("treeview");
}
if (treeview.ItemsSource == null)
{
// Nothing to render
return(_scrollPosition);
}
if (treeview.TreeviewSourceDecoder == null)
{
// Cannot render as cannot decode.
return(_scrollPosition);
}
if (eventType == EventType.Repaint)
{
// Only reset before the click locations are due to be refreshed.
rowClickableLocations.Reset();
}
var localDecoder = treeview.TreeviewSourceDecoder;
_scrollPosition = guiLayout.BeginScrollView(_scrollPosition);
var root = itemCache.Root(treeview, localDecoder);
// render root
treeviewRowRenderer.RenderRow(root, localDecoder, eventType);
if (root.IsExpanded)
{
RenderChildren(root, localDecoder, eventType);
}
guiLayout.EndScrollView();
return(_scrollPosition);
}