using System.Collections.Specialized;
using System.Linq;

namespace Xamarin.Forms.Platform.Tizen.Native
{
	/// <summary>
	/// Represents a dynamic data collection that provides notifications when items get added, removed, or when the whole list is refreshed.
	/// </summary>
	/// <typeparam name="T">The type of elements in the collection.</typeparam>
	internal class ObservableCollection<T> : System.Collections.ObjectModel.ObservableCollection<T>
	{
		/// <summary>
		/// Removes all items from the collection.
		/// </summary>
		/// <remarks>
		/// Fisrt remove all items, send CollectionChanged event with Remove Action
		/// Second call ClearItems of base
		/// </remarks>
		protected override void ClearItems()
		{
			var oldItems = Items.ToList();
			Items.Clear();
			using (BlockReentrancy())
			{
				OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, oldItems));
			}
			base.ClearItems();
		}
	}
}