// 
// PanedBackend.cs
//  
// Author:
//       Lluis Sanchez <lluis@xamarin.com>
// 
// Copyright (c) 2012 Xamarin Inc
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using AppKit;
using Foundation;
using Xwt.Backends;

namespace Xwt.Mac
{
	public class PanedBackend: ViewBackend<NSSplitView,IPanedEventSink>, IPanedBackend
	{
		SplitViewDelegate viewDelegate;
		NSView view1;
		NSView view2;
		
		class SplitViewDelegate: NSSplitViewDelegate
		{
			public PanedBackend PanedBackend;
			
			public override void DidResizeSubviews (NSNotification notification)
			{
				PanedBackend.DidResizeSubviews ();
			}
		}
		
		public PanedBackend ()
		{
		}

		#region IPanedBackend implementation
		public void Initialize (Orientation dir)
		{
			ViewObject = new CustomSplitView ();
			if (dir == Orientation.Horizontal)
				Widget.IsVertical = true;
			viewDelegate = new SplitViewDelegate () { PanedBackend = this };
			Widget.Delegate = viewDelegate;
		}

		public void SetPanel (int panel, IWidgetBackend widget, bool resize, bool shrink)
		{
			ViewBackend view = (ViewBackend) widget;
			var w = GetWidgetWithPlacement (view);
			RemovePanel (panel);
			Widget.AddSubview (w);
			Widget.AdjustSubviews ();
			if (panel == 1)
				view1 = w;
			else
				view2 = w;
			view.NotifyPreferredSizeChanged ();
		}
		
		void DidResizeSubviews ()
		{
			EventSink.OnPositionChanged ();
		}

		public void UpdatePanel (int panel, bool resize, bool shrink)
		{
		}

		public void RemovePanel (int panel)
		{
			if (panel == 1) {
				if (view1 != null) {
					view1.RemoveFromSuperview ();
					RemoveChildPlacement (view1);
					view1 = null;
				}
			} else {
				if (view2 != null) {
					view2.RemoveFromSuperview ();
					RemoveChildPlacement (view2);
					view2 = null;
				}
			}
		}

		public override void ReplaceChild (NSView oldChild, NSView newChild)
		{
			if (view1 != null)
				view1.RemoveFromSuperview ();
			if (view2 != null)
				view2.RemoveFromSuperview ();

			if (oldChild == view1)
				view1 = newChild;
			else
				view2 = newChild;

			if (view1 != null)
				Widget.AddSubview (view1);
			if (view2 != null)
				Widget.AddSubview (view2);
		}

		public double Position {
			get {
				return 0;
			}
			set {
			}
		}
		#endregion
	}
	
	class CustomSplitView: NSSplitView, IViewObject
	{
		public NSView View {
			get {
				return this;
			}
		}

		public ViewBackend Backend { get; set; }
	}
}