using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace WeifenLuo.WinFormsUI.Docking
{
	public class DockWindowCollection : ReadOnlyCollection<DockWindow>
	{
		internal DockWindowCollection(DockPanel dockPanel)
            : base(new List<DockWindow>())
		{
			Items.Add(new DockWindow(dockPanel, DockState.Document));
			Items.Add(new DockWindow(dockPanel, DockState.DockLeft));
			Items.Add(new DockWindow(dockPanel, DockState.DockRight));
			Items.Add(new DockWindow(dockPanel, DockState.DockTop));
			Items.Add(new DockWindow(dockPanel, DockState.DockBottom));
		}

		public DockWindow this [DockState dockState]
		{
			get
			{
				if (dockState == DockState.Document)
					return Items[0];
				else if (dockState == DockState.DockLeft || dockState == DockState.DockLeftAutoHide)
					return Items[1];
				else if (dockState == DockState.DockRight || dockState == DockState.DockRightAutoHide)
					return Items[2];
				else if (dockState == DockState.DockTop || dockState == DockState.DockTopAutoHide)
					return Items[3];
				else if (dockState == DockState.DockBottom || dockState == DockState.DockBottomAutoHide)
					return Items[4];

				throw (new ArgumentOutOfRangeException());
			}
		}
	}
}