DialogAdapter.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
using Android.Content;
using Android.Views;
using Android.Widget;

namespace MonoDroid.Dialog
{
    public class DialogAdapter : BaseAdapter<Section>
    {
        const int TYPE_SECTION_HEADER = 0;
        Context context;
        LayoutInflater inflater;

        public DialogAdapter (Context context, RootElement root)
        {
            this.context = context;
            this.inflater = LayoutInflater.From (context);
            this.Root = root;           
        }
        
        public RootElement Root { get; set; }

        public override bool IsEnabled (int position)
        {
            // start counting from here
            int typeOffset = TYPE_SECTION_HEADER + 1;

            foreach (var s in Root.Sections) {
                if (position == 0)
                    return false;

                int size = s.Adapter.Count + 1;

                if (position < size)
                    return true;

                position -= size;
                typeOffset += s.Adapter.ViewTypeCount;
            }

            return false;
        }

        public override int Count {
            get {
                int count = 0;

                //Get each adapter's count + 1 for the header
                foreach (var s in Root.Sections) {
                    count += s.Adapter.Count + 1;
                }

                return count;
            }
        }

        public override int ViewTypeCount {
            get {
                return this.Count;
            }
        }

        public Element ElementAtIndex (int position)
        {
            int sectionIndex = 0;
            foreach (var s in Root.Sections) {
                if (position == 0) {
                    return this.Root.Sections [sectionIndex];
                }
                // note: plus one for the section header view
                int size = s.Adapter.Count + 1;
                if (position < size) {
                    return this.Root.Sections [sectionIndex].Elements [position - 1];
                }
                position -= size;
                sectionIndex++;
            }

            return null;
        }

        public override Section this [int position] {
            get { return this.Root.Sections [position]; }
        }

        public override bool AreAllItemsEnabled ()
        {
            return false;
        }

        public override int GetItemViewType (int position)
        {
            // start counting from here
            int typeOffset = TYPE_SECTION_HEADER + 1;

            foreach (var s in Root.Sections) {
                if (position == 0)
                    return (TYPE_SECTION_HEADER);

                int size = s.Adapter.Count + 1;

                if (position < size)
                    return (typeOffset + s.Adapter.GetItemViewType (position - 1));

                position -= size;
                typeOffset += s.Adapter.ViewTypeCount;
            }

            return -1;
        }

        public override long GetItemId (int position)
        {
            return position;
        }

        public override View GetView (int position, View convertView, ViewGroup parent)
        {
            int sectionIndex = 0;

            foreach (var s in Root.Sections) {
                if (s.Adapter.Context == null)
                    s.Adapter.Context = this.context;

                if (position == 0)
                    return s.GetView (context, convertView, parent);

                int size = s.Adapter.Count + 1;

                if (position < size)
                    return (s.Adapter.GetView (position - 1, convertView, parent));

                position -= size;
                sectionIndex++;
            }

            return null;
        }
        
        public void ReloadData ()
        {
            if (Root != null) {
                this.NotifyDataSetChanged ();
            }
        }
    }
}