using System;
using UIKit;
using CoreGraphics;
using Shared.IO;
using Foundation;

namespace Shared
{
	/// <summary>
	/// 位置布局，已经全面检查
	/// </summary>
	public class VerticalScrolViewLayout : ViewGroup
	{
		/// <summary>
		/// 构造函数
		/// </summary>
		public VerticalScrolViewLayout()
		{
			viewGroup = new MyUIScrolView(this);
			realViewGroup = viewGroup;
			(viewGroup as MyUIScrolView).Scrolled += (sender, e) =>
			{
				if (ScrolledEventHandler != null)
				{
					ScrolledEventHandler(this, new MouseEventArgs { X = (float)(sender as MyUIScrolView).ContentOffset.X, Y = (float)(sender as MyUIScrolView).ContentOffset.Y });
				}
			};
		}

		/// <summary>
		/// 增加控件
		/// </summary>
		/// <param name="view">子控件</param>
		public override void AddChidren(View view)
		{
			base.AddChidren(view);
			ReLocation();
		}

		/// <summary>
		/// 重新排位置及设备内容大小
		/// </summary>
		public virtual void ReLocation()
		{
			if (0 == viewList.Count)
			{
				return;
			}
            var frame1 = viewList[0].RealView.Frame;
			frame1.Y = 0;
			viewList[0].RealView.Frame = frame1;

			for (int i = 1; i < viewList.Count; i++)
			{
				var frame = viewList[i].RealView.Frame;
				frame.Y = viewList[i - 1].RealView.Frame.Bottom;
				viewList[i].RealView.Frame = frame;
			}

			(realViewGroup as MyUIScrolView).ContentSize = new CoreGraphics.CGSize(0, viewList[viewList.Count - 1].Bottom <= Height ? Height + 1 : viewList[viewList.Count - 1].Bottom);
		}

		/// <summary>
		/// 移除所有的视图
		/// </summary>
		public override void RemoveAll()
		{
			base.RemoveAll();

			ReLocation();
		}

		/// <summary>
		/// 移除当前视图
		/// </summary>
		/// <param name="view">当前视图</param>
		public override void Remove(View view)
		{
			base.Remove(view);

			ReLocation();
		}

		/// <summary>
		/// 移除指定索引
		/// </summary>
		/// <param name="index">索引</param>
		public override void RemoveAt(int index)
		{
			base.RemoveAt(index);
			ReLocation();
		}

		/// <summary>
		/// 是否允许滑动
		/// </summary>
		/// <value><c>true</c> if scroll enabled; otherwise, <c>false</c>.</value>
		public bool ScrollEnabled
		{
			get
			{
				return (viewGroup as MyUIScrolView).ScrollEnabled;
			}
			set
			{
				(viewGroup as MyUIScrolView).ScrollEnabled = value;
			}
		}

		/// <summary>
		/// 是否正在滑动
		/// </summary>
		/// <value><c>true</c> if decelerating; otherwise, <c>false</c>.</value>
		public bool Decelerating
		{
			get
			{
				return (viewGroup as MyUIScrolView).Decelerating;
			}
		}

		/// <summary>
		/// 滑动事件
		/// </summary>
		public event EventHandler<MouseEventArgs> ScrolledEventHandler;
	}

	/// <summary>
	/// 垂直方向滚动视图
	/// </summary>
	class MyUIScrolView : UIScrollView
	{
		View _view;
		/// <summary>
		/// 构造函数
		/// </summary>
		/// <param name="view">对外的实际视图</param>
		public MyUIScrolView(View view)
		{
			_view = view;
		}
		/// <summary>
		/// 点击开始
		/// </summary>
		/// <param name="touches">Touches.</param>
		/// <param name="evt">Evt.</param>
		public override void TouchesBegan(NSSet touches, UIEvent evt)
		{
			//base.TouchesBegan(touches, evt);
			if (_view == null)
				return;
			var touch = touches.AnyObject as UITouch;
			_view.TouchEvent(EventActions.Down, touch.LocationInView(this));
		}
		/// <summary>
		///  移动
		/// </summary>
		/// <param name="touches">Touches.</param>
		/// <param name="evt">Evt.</param>
		public override void TouchesMoved(NSSet touches, UIEvent evt)
		{
			//base.TouchesMoved(touches, evt);
			if (_view == null)
				return;
			var touch = touches.AnyObject as UITouch;
			_view.TouchEvent(EventActions.Move, touch.LocationInView(this));
		}
		/// <summary>
		/// 点击弹起
		/// </summary>
		/// <param name="touches">Touches.</param>
		/// <param name="evt">Evt.</param>
		public override void TouchesEnded(NSSet touches, UIEvent evt)
		{
			//base.TouchesEnded(touches, evt);
			if (_view == null)
				return;
			var touch = touches.AnyObject as UITouch;
			_view.TouchEvent(EventActions.Up, touch.LocationInView(this));
		}
		
		/// <summary>
		/// 框架默认加了两个UIImageView ，这样可以去掉默认添加
		/// </summary>
		/// <param name="view">View.</param>
		public override void AddSubview(UIView view)
		{
			if (view.GetType() == typeof(UIImageView) && view.Tag != int.MinValue)
			{
				return;
			}
			base.AddSubview(view);
		}
	}


}