using System;
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using CoreGraphics;
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using UIKit;
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namespace Shared
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{
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public class MusicVerticalScrolViewLayout: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 MusicVerticalScrolViewLayout()
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{
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viewGroup = new MyUIScrolView(this);
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viewGroup.AddGestureRecognizer(new UILongPressGestureRecognizer(sender =>
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{
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uiViewLongPressed(sender);
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})
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{ MinimumPressDuration = 1.0f });
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realViewGroup = viewGroup;
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}
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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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int maxHeight = 0;
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foreach (View tempView in viewList)
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{
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if (maxHeight < tempView.Bottom)
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{
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maxHeight = tempView.Bottom;
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}
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}
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(realViewGroup as MyUIScrolView).ContentSize = new CGSize(Width, maxHeight < realViewGroup.Frame.Height ? (realViewGroup.Frame.Height + 1) : maxHeight);
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}
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/// <summary>
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/// 根据点击位置找出点击到的视图
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/// </summary>
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/// <returns>The view of point.</returns>
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/// <param name="point">Point.</param>
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/// <param name="uiview">Uiview.</param>
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UIView replaceUIViewOfPoint(CGPoint point, UIView uiview)
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{
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//第一个是背景图
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for (int i = 1; i < realViewGroup.Subviews.Length; i++)
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{
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var tempUIView = realViewGroup.Subviews[i];
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if (tempUIView != uiview)
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{
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if (tempUIView.Frame.Contains(point))
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{
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return tempUIView;
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}
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}
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}
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return null;
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}
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/// <summary>
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///
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/// </summary>
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public Action<View, View> ReplaceChanged;
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/// <summary>
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/// 长按事件
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/// </summary>
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public Action<View> LongPressAction;
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/// <summary>
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/// 根据点击位置找出点击到的视图
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/// </summary>
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/// <returns>返回点击到的视图</returns>
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/// <param name="point">当前点击位置</param>
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UIView selectedUIViewOfPoint(CGPoint point)
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{
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foreach (UIView uiView in realViewGroup.Subviews)
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{
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if (uiView.GetType() != typeof(UIImageView) && uiView.Frame.Contains(point))
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{
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return uiView;
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}
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}
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return null;
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}
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CGPoint originPoint;
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UIView selectedUIView,replaceUIView;
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bool isFirst;
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void uiViewLongPressed(UILongPressGestureRecognizer sender)
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{
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//长按开始
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if (sender.State == UIGestureRecognizerState.Began)
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{
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//找出当前点击位置的视图
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selectedUIView = selectedUIViewOfPoint(sender.LocationInView(sender.View));
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if (selectedUIView == null)
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{
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return;
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}
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viewGroup.BringSubviewToFront(selectedUIView);
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originPoint = selectedUIView.Center;
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isFirst = false;
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UIView.Animate(1.0f, () =>
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{
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selectedUIView.Transform = CGAffineTransform.MakeScale(0.8f, 0.8f);
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selectedUIView.Alpha = 0.7f;
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});
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}
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else if (sender.State == UIGestureRecognizerState.Changed)
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{
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if (selectedUIView == null)
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{
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return;
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}
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//移动当前视图
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selectedUIView.Center = sender.LocationInView(sender.View);
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//获取当前视图进入了哪个视图的区域
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var temReplaceUIView = replaceUIViewOfPoint(selectedUIView.Center, selectedUIView);
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replaceUIView = temReplaceUIView;
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if (temReplaceUIView != null)
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{
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if (isFirst)
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{
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return;
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}
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isFirst = true;
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////进入区域后切换位置
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UIView.Animate(1.0f, () =>
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{
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temReplaceUIView.Transform = CGAffineTransform.MakeScale(1.1f, 1.1f);
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}, () =>
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{
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temReplaceUIView.Transform = CGAffineTransform.MakeScale(1.0f, 1.0f);
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});
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}
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}
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else if (sender.State == UIGestureRecognizerState.Ended)
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{
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if (selectedUIView == null)
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{
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return;
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}
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View selectedView = null;
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foreach (View view in viewList)
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{
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if (view.RealView == selectedUIView)
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{
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selectedView = view;
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break;
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}
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}
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if(selectedUIView!=null&&selectedUIView.Frame.Contains(originPoint)){
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UIView.Animate(1.0f, () =>
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{
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selectedUIView.Transform = CGAffineTransform.MakeIdentity();
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selectedUIView.Alpha = 1.0f;
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selectedUIView.Center = originPoint;
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});
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return;
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}
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UIView.Animate(1.0f, () =>
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{
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selectedUIView.Transform = CGAffineTransform.MakeIdentity();
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selectedUIView.Alpha = 1.0f;
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selectedUIView.Center = originPoint;
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});
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if (replaceUIView == null)
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{
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if (LongPressAction != null)
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{
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LongPressAction(selectedView);
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}
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return;
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}
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View replaceView = null;
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foreach (View view in viewList)
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{
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if (view.RealView == replaceUIView)
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{
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replaceView = view;
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break;
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}
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}
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if (ReplaceChanged != null)
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{
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ReplaceChanged(replaceView, selectedView);
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}
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}
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}
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}
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}
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