using System;
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using UIKit;
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using CoreGraphics;
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using Shared.IO;
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using Foundation;
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namespace Shared
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{
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/// <summary>
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/// 位置布局，已经全面检查
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/// </summary>
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public class VerticalScrolViewLayout : ViewGroup
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{
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/// <summary>
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/// 构造函数
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/// </summary>
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public VerticalScrolViewLayout()
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{
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viewGroup = new MyVerticalScrolViewLayout(this) { };
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realViewGroup = viewGroup;
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}
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/// <summary>
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/// 垂直方向滚动视图
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/// </summary>
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class MyVerticalScrolViewLayout : UIScrollView
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{
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[Weak] VerticalScrolViewLayout verticalScrolViewLayout;
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public MyVerticalScrolViewLayout(VerticalScrolViewLayout verticalScrolViewLayout)
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{
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this.verticalScrolViewLayout = verticalScrolViewLayout;
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Scrolled += (sender, e) =>
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{
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this.verticalScrolViewLayout?.ScrolledEventHandler?.Invoke(this, new MouseEventArgs { X = (float)(sender as MyVerticalScrolViewLayout).ContentOffset.X, Y = (float)(sender as MyVerticalScrolViewLayout).ContentOffset.Y });
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};
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}
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/// <summary>
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/// 点击开始
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesBegan(NSSet touches, UIEvent evt)
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{
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verticalScrolViewLayout?.TouchEvent(EventActions.Down, (touches.AnyObject as UITouch).LocationInView(this));
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}
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/// <summary>
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/// 移动
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesMoved(NSSet touches, UIEvent evt)
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{
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verticalScrolViewLayout?.TouchEvent(EventActions.Move, (touches.AnyObject as UITouch).LocationInView(this));
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}
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/// <summary>
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/// 点击弹起
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesEnded(NSSet touches, UIEvent evt)
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{
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verticalScrolViewLayout?.TouchEvent(EventActions.Up, (touches.AnyObject as UITouch).LocationInView(this));
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}
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public override void TouchesCancelled(NSSet touches, UIEvent evt)
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{
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verticalScrolViewLayout?.TouchEvent(EventActions.Cancel, (touches.AnyObject as UITouch).LocationInView(this));
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}
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/// <summary>
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/// 框架默认加了两个UIImageView ，这样可以去掉默认添加
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/// </summary>
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/// <param name="view">View.</param>
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public override void AddSubview(UIView view)
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{
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if (view.GetType() == typeof(UIImageView) && view.Tag != int.MinValue)
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{
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return;
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}
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base.AddSubview(view);
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}
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}
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/// <summary>
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/// 增加控件
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/// </summary>
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/// <param name="view">子控件</param>
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public override void AddChidren(View view)
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{
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base.AddChidren(view);
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ReLocation();
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}
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/// <summary>
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/// 重新排位置及设备内容大小
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/// </summary>
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public virtual void ReLocation()
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{
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if (0 == viewList.Count)
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{
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return;
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}
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var frame1 = viewList[0].RealView.Frame;
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frame1.Y = 0;
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viewList[0].RealView.Frame = frame1;
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for (int i = 1; i < viewList.Count; i++)
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{
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var frame = viewList[i].RealView.Frame;
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frame.Y = viewList[i - 1].RealView.Frame.Bottom;
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viewList[i].RealView.Frame = frame;
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}
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(realViewGroup as MyVerticalScrolViewLayout).ContentSize = new CoreGraphics.CGSize(0, viewList[viewList.Count - 1].Bottom <= Height ? Height + 1 : viewList[viewList.Count - 1].Bottom);
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}
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/// <summary>
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/// 移除所有的视图
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/// </summary>
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public override void RemoveAll()
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{
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base.RemoveAll();
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ReLocation();
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}
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/// <summary>
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/// 移除当前视图
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/// </summary>
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/// <param name="view">当前视图</param>
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internal override void Remove(View view)
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{
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base.Remove(view);
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ReLocation();
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}
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/// <summary>
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/// 移除指定索引
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/// </summary>
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/// <param name="index">索引</param>
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public override void RemoveAt(int index)
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{
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base.RemoveAt(index);
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ReLocation();
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}
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/// <summary>
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/// 是否允许滑动
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/// </summary>
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/// <value><c>true</c> if scroll enabled; otherwise, <c>false</c>.</value>
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public bool ScrollEnabled
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{
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get
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{
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return (viewGroup as MyVerticalScrolViewLayout).ScrollEnabled;
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}
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set
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{
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(viewGroup as MyVerticalScrolViewLayout).ScrollEnabled = value;
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}
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}
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/// <summary>
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/// 是否正在滑动
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/// </summary>
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/// <value><c>true</c> if decelerating; otherwise, <c>false</c>.</value>
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public bool Decelerating
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{
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get
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{
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return (viewGroup as MyVerticalScrolViewLayout).Decelerating;
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}
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}
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/// <summary>
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/// 滑动事件
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/// </summary>
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public EventHandler<MouseEventArgs> ScrolledEventHandler;
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/// <summary>
/// 是否显示垂直滚动条
/// </summary>
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public bool VerticalScrollBarEnabled
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{
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get
{
return (viewGroup as MyVerticalScrolViewLayout).ShowsVerticalScrollIndicator;
}
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set
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{
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(viewGroup as MyVerticalScrolViewLayout).ShowsVerticalScrollIndicator = value;
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}
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}
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/// <summary>
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/// 滑动到指定位置
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/// </summary>
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/// <param name="viewY"></param>
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public void ScrollToY(int viewY)
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{
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//计算最大可以滚动的区域
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var maxY = (realViewGroup as MyVerticalScrolViewLayout).ContentSize.Height - Height;
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if (viewY > maxY)
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{
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viewY = (int)maxY;
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}
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if (viewY < 0)
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{
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viewY = 0;
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}
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(viewGroup as MyVerticalScrolViewLayout).SetContentOffset(new CGPoint(0, viewY), false);
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}
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/// <summary>
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/// 滑动到指定VIEW
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/// </summary>
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/// <param name="viewIndex"></param>
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public void ScrollToViewIndex(int viewIndex)
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{
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if (viewList.Count == 0)
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return;
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var viewY = this.viewList[viewIndex].Y;
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//计算最大可以滚动的区域
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var maxY = (realViewGroup as MyVerticalScrolViewLayout).ContentSize.Height - Height;
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if (viewY > maxY)
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{
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viewY = (int)maxY;
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}
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if (viewY < 0)
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{
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viewY = 0;
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}
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(viewGroup as MyVerticalScrolViewLayout).SetContentOffset(new CGPoint(0, viewY), false);
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}
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}
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}
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