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wxr
2023-03-31 7e42cc13a14b7de31c9f5d5c61cdf24f3246335d
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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 MyVerticalScrolViewLayout(this) { };
           
            realViewGroup = viewGroup;
        }
 
        /// <summary>
        /// 垂直方向滚动视图
        /// </summary>
        class MyVerticalScrolViewLayout : UIScrollView
        {
            [Weak] VerticalScrolViewLayout verticalScrolViewLayout;
            public MyVerticalScrolViewLayout(VerticalScrolViewLayout verticalScrolViewLayout)
            {
                this.verticalScrolViewLayout = verticalScrolViewLayout;
                Scrolled += (sender, e) =>
                {
                   this.verticalScrolViewLayout?.ScrolledEventHandler?.Invoke(this, new MouseEventArgs { X = (float)(sender as MyVerticalScrolViewLayout).ContentOffset.X, Y = (float)(sender as MyVerticalScrolViewLayout).ContentOffset.Y });
                };
            }
            /// <summary>
            /// 点击开始
            /// </summary>
            /// <param name="touches">Touches.</param>
            /// <param name="evt">Evt.</param>
            public override void TouchesBegan(NSSet touches, UIEvent evt)
            {
                verticalScrolViewLayout?.TouchEvent(EventActions.Down, (touches.AnyObject as UITouch).LocationInView(this));
            }
            /// <summary>
            ///  移动
            /// </summary>
            /// <param name="touches">Touches.</param>
            /// <param name="evt">Evt.</param>
            public override void TouchesMoved(NSSet touches, UIEvent evt)
            {
                verticalScrolViewLayout?.TouchEvent(EventActions.Move, (touches.AnyObject as UITouch).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)
            {
                verticalScrolViewLayout?.TouchEvent(EventActions.Up, (touches.AnyObject as UITouch).LocationInView(this));
            }
 
            public override void TouchesCancelled(NSSet touches, UIEvent evt)
            {
                verticalScrolViewLayout?.TouchEvent(EventActions.Cancel, (touches.AnyObject as UITouch).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);
            }
        }
 
        /// <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 MyVerticalScrolViewLayout).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>
        internal 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 MyVerticalScrolViewLayout).ScrollEnabled;
            }
            set
            {
                (viewGroup as MyVerticalScrolViewLayout).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 MyVerticalScrolViewLayout).Decelerating;
            }
        }
 
        /// <summary>
        /// 滑动事件
        /// </summary>
        public  EventHandler<MouseEventArgs> ScrolledEventHandler;
 
        /// <summary>
        /// 是否显示垂直滚动条
        /// </summary>
 
        public bool VerticalScrollBarEnabled
        {
            get
            {
                return (viewGroup as MyVerticalScrolViewLayout).ShowsVerticalScrollIndicator;
            }
            set
            {
                (viewGroup as MyVerticalScrolViewLayout).ShowsVerticalScrollIndicator = value;
 
            }
        }
 
    }
 
 
 
 
}