using System;
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using CoreGraphics;
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using Foundation;
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using UIKit;
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namespace Shared
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{
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public class LongPressMoveVerticalScrolViewLayout: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 LongPressMoveVerticalScrolViewLayout()
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{
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viewGroup = new MyLongPressMoveVerticalScrolViewLayout(this);
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realViewGroup = viewGroup;
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viewGroup.AddGestureRecognizer(new MyUILongPressGestureRecognizer(sender =>
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{
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(sender as MyUILongPressGestureRecognizer).longPressMoveVerticalScrolViewLayout?.uiViewLongPressed(sender);
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})
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{ longPressMoveVerticalScrolViewLayout = this });
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}
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class MyUILongPressGestureRecognizer : UILongPressGestureRecognizer {
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[Weak] internal LongPressMoveVerticalScrolViewLayout longPressMoveVerticalScrolViewLayout;
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public MyUILongPressGestureRecognizer(Action<UILongPressGestureRecognizer> action):base(action) {
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}
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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 MyLongPressMoveVerticalScrolViewLayout).ContentSize = new CGSize(Width, 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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/// 对换位置的两个视图
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/// </summary>
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public Action<View,View> ReplaceChanged;
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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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bool contain;
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UIView selectedUIView;
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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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originPoint = selectedUIView.Center;
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UIView.Animate(1.0f, () =>
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{
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selectedUIView.Transform = CGAffineTransform.MakeScale(1.1f, 1.1f);
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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 replaceUIView = replaceUIViewOfPoint(selectedUIView.Center, selectedUIView);
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if (replaceUIView ==null)
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{
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contain = false;
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}
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else
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{
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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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var temp = replaceUIView.Center;
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replaceUIView.Center = originPoint;
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selectedUIView.Center = temp;
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originPoint = selectedUIView.Center;
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contain = true;
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}, () =>
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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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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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ReplaceChanged(selectedView, replaceView);
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}
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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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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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//如果不需要移动位置
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if (!contain)
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{
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selectedUIView.Center = originPoint;
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}
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});
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}
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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 MyLongPressMoveVerticalScrolViewLayout).ScrollEnabled;
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}
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set
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{
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(viewGroup as MyLongPressMoveVerticalScrolViewLayout).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 MyLongPressMoveVerticalScrolViewLayout).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>
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/// 垂直方向滚动视图
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/// </summary>
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class MyLongPressMoveVerticalScrolViewLayout : UIScrollView
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{
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[Weak] LongPressMoveVerticalScrolViewLayout view;
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public MyLongPressMoveVerticalScrolViewLayout(LongPressMoveVerticalScrolViewLayout view)
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{
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this.view = view;
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Scrolled += (sender, e) =>
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{
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this.view?.ScrolledEventHandler?.Invoke(this, new MouseEventArgs { X = (float)(sender as MyLongPressMoveVerticalScrolViewLayout).ContentOffset.X, Y = (float)(sender as MyLongPressMoveVerticalScrolViewLayout).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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view?.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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view?.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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view?.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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view?.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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}
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}
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