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using System.Collections.Generic;
using Android.Support.V7.Widget;
using Android.Views;
namespace Xamarin.Forms.Platform.Android
{
internal class ItemViewAdapter : RecyclerView.Adapter
{
readonly IVisualElementRenderer _renderer;
readonly Dictionary<int, object> _typeByTypeId;
readonly Dictionary<object, int> _typeIdByType;
int _nextItemTypeId;
public ItemViewAdapter(IVisualElementRenderer carouselRenderer)
{
_renderer = carouselRenderer;
_typeByTypeId = new Dictionary<int, object>();
_typeIdByType = new Dictionary<object, int>();
_nextItemTypeId = 0;
}
public override int ItemCount
{
get { return Element.Count; }
}
IItemViewController Controller
{
get { return Element; }
}
ItemsView Element
{
get { return (ItemsView)_renderer.Element; }
}
public override int GetItemViewType(int position)
{
// get item and type from ItemSource and ItemTemplate
object item = Controller.GetItem(position);
object type = Controller.GetItemType(item);
// map type as DataTemplate to type as Id
int id = default(int);
if (!_typeIdByType.TryGetValue(type, out id))
{
id = _nextItemTypeId++;
_typeByTypeId[id] = type;
_typeIdByType[type] = id;
}
return id;
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
var carouselHolder = (CarouselViewHolder)holder;
object item = Controller.GetItem(position);
Controller.BindView(carouselHolder.View, item);
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
// create view from type
object type = _typeByTypeId[viewType];
View view = Controller.CreateView(type);
// create renderer for view
IVisualElementRenderer renderer = Platform.CreateRenderer(view);
Platform.SetRenderer(view, renderer);
// package renderer + view
return new CarouselViewHolder(view, renderer);
}
class CarouselViewHolder : RecyclerView.ViewHolder
{
public CarouselViewHolder(View view, IVisualElementRenderer renderer) : base(renderer.ViewGroup)
{
VisualElementRenderer = renderer;
View = view;
}
public View View { get; }
public IVisualElementRenderer VisualElementRenderer { get; }
}
}
}
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