protected virtual IEnumerable <IMenuModel> CreateChildren(Option <IMenuModel> parent)
{
if (parent.IsNone)
{
return(RootItems);
}
var model = parent.Map(p => p.Model);
var provider = StructureProviders.Find(p => model.Exists(p.HasChildren));
this.LogDebug("Loading children for {}.", parent.Head());
this.LogDebug("Using structure provider: {}.", provider);
var children =
from m in model
from p in provider
select p.FindChildren(m);
return(children.Flatten().Bind(child => CreateItem(child, parent)));
}
private void HandleItemsChange(IEnumerable <IMenuModel> items)
{
ItemsContainer.GetChildren()
.OfType <Node>()
.Filter(c => !EmptyLabel.Contains(c))
.Iter(ItemsContainer.FreeChild);
bool IsValid(IMenuModel item)
{
var hasChildren = StructureProviders.Exists(p => p.HasChildren(item.Model));
var executable = MenuHandlers.Exists(h => h.CanExecute(item));
return(hasChildren || executable);
}
var list = items.Filter(IsValid).Freeze();
list.Iter((index, item) => CreateItemControl(item, index, ItemsContainer));
EmptyLabel.Iter(v => v.Visible = !list.Any());
}
