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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/// <summary>
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/// 右滑抽屉View
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/// </summary>
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public class UIDrawerLayout : ViewGroup
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{
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/// <summary>
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/// 当前视图
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/// </summary>
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/// <value>The UICoverFlowView.</value>
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MyUIDrawerLayout mUIDrawerLayout
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{
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get
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{
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return uiView as MyUIDrawerLayout;
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}
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set
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{
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uiView = value;
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}
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}
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UIView leftView;
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UIView mainView;
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/// <summary>
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/// 构造函数
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/// </summary>
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public UIDrawerLayout()
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{
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mUIDrawerLayout = new MyUIDrawerLayout(this) { };
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viewGroup = mUIDrawerLayout;
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mainView = new UIView();
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realViewGroup = mainView;
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viewGroup.AddSubview(realViewGroup);
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viewGroup.Layer.MasksToBounds = true;
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leftView = new UIView();
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//new UIView(new CGRect(0, 0, Application.CurrentWidth, Application.CurrentHeight));
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var mFrame = leftView.Frame;
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mFrame.Y = 0;
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mFrame.X = 0;
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mFrame.Width = Application.CurrentWidth;
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mFrame.Height = Application.CurrentHeight;
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mFrame.X = -Application.CurrentWidth;
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leftView.Frame = mFrame;
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leftView.BackgroundColor = UIColor.FromRGBA(0, 0, 0, 99);
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viewGroup.AddSubview(leftView);
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}
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View leftChildView;
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/// <summary>
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/// 增加左边视图
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/// </summary>
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/// <param name="view">View.</param>
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public void AddLeftView(View view)
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{
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if (null == view)
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{
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return;
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}
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LeftViewRemoveAllViews();
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view.Parent = this;
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leftChildView = view;
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//view.X = 0;
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//view.Y = 0;
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//view.Width = Width;
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//view.Height = Height;
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//view.Parent = this;
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//view.Refresh();
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var addFrame = leftView.Frame;
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addFrame.X = 0;
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addFrame.Y = 0;
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//addFrame.Height = Height;
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//addFrame.Width = Width;
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leftChildView.RealView.Frame = addFrame;
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leftView.AddSubview(leftChildView.RealView);
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}
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/// <summary>
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/// RemoveLeftView
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/// </summary>
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public void LeftViewRemoveAllViews()
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{
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if (leftChildView == null) return;
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if (leftChildView.RealView.Superview != null)
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{
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leftChildView.RealView.RemoveFromSuperview();
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}
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leftChildView.Parent = null;
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}
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/// <summary>
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/// 是否锁定右滑功能， 锁定后右滑弹出菜单失效
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/// </summary>
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bool _IsDrawerLockMode;
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public bool IsDrawerLockMode
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{
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get
{
return _IsDrawerLockMode;
}
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set
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{
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_IsDrawerLockMode = value;
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mUIDrawerLayout.IsDrawerLockMode = _IsDrawerLockMode;
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}
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}
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bool _IsDrawerOpen = false;
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private bool IsDrawerOpen
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{
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get
{
return _IsDrawerOpen;
}
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set
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{
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_IsDrawerOpen = value;
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mUIDrawerLayout.IsDrawerOpen = _IsDrawerOpen;
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}
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}
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/// <summary>
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/// 打开抽屉view
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/// </summary>
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public void OpenLeftMenu()
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{
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if (!IsDrawerOpen)
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{
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IsDrawerOpen = true;
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ShowLeftView(IsDrawerOpen);
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//System.Console.WriteLine("OpenLeftMenu-------");
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}
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}
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/// <summary>
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/// 关闭抽屉view
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/// </summary>
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public void CloseLeftMenu()
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{
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if (IsDrawerOpen)
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{
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IsDrawerOpen = false;
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ShowLeftView(IsDrawerOpen);
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//System.Console.WriteLine("CloseLeftMenu-------");
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}
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}
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//private CABasicAnimation moveX(float X)
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//{
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// //CABasicAnimation animation = new CABasicAnimation("transform.translation.x");
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// CABasicAnimation animation = CABasicAnimation.FromKeyPath("transform.translation.x");
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// animation.To = NSNumber.FromFloat(X);
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// animation.Duration = 0.2F;
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// animation.RemovedOnCompletion = false;//yes的话，又返回原位置了。
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// animation.RepeatCount = 1;
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// animation.FillMode = CAFillMode.Forwards;
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// return animation;
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//}
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/// <summary>
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/// 是否打开显示左边菜单view
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/// </summary>
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private void ShowLeftView(bool bShow)
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{
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var mFrame = leftView.Frame;
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mFrame.X = bShow ? 0 : -mUIDrawerLayout.Frame.Size.Width;
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leftView.Frame = mFrame;
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}
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/// <summary>
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/// 移动左边view
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/// </summary>
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public void MoveLeftView(nfloat XX)
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{
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if (IsDrawerOpen)
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{
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if (XX < 0)
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{
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var mFrame = leftView.Frame;
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mFrame.X = 0 + XX;
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leftView.Frame = mFrame;
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}
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}
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else
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{
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if(XX > 0)
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{
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var mFrame = leftView.Frame;
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mFrame.X = -mUIDrawerLayout.Frame.Size.Width + XX;
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leftView.Frame = mFrame;
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}
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}
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}
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/// <summary>
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/// 重置左边view
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/// </summary>
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public void ResetView()
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{
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var mFrame = leftView.Frame;
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if (IsDrawerOpen)
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{
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mFrame.X = 0;
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//System.Console.WriteLine($"Reset Open");
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}
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else
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{
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mFrame.X = -mUIDrawerLayout.Frame.Size.Width;
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//System.Console.WriteLine($"Reset CLOSE");
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}
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leftView.Frame = mFrame;
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}
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nfloat mLastX, mLastY, deltaX;
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int mTouchSlop = 3;
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private void MYTouchEvent(EventActions eventAction, CGPoint point)
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{
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if (_IsDrawerLockMode) return;
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switch (eventAction)
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{
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case EventActions.Down:
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//记录点击的最新X坐标
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mLastX = point.X;
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mLastY = point.Y;
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//System.Console.WriteLine($"DrawerLayout:EventActions.Down XXX{mLastX}");
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break;
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case EventActions.Move:
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moveWithPoint(point);
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//System.Console.WriteLine("DrawerLayout:EventActions.Move");
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break;
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case EventActions.Up:
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//System.Console.WriteLine($"DrawerLayout:EventActions.Down deltaX{deltaX} WWW:{mUIDrawerLayout.Frame.Size.Width} ");
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if (Math.Abs(deltaX) >= mUIDrawerLayout.Frame.Size.Width / 2)
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{
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if (deltaX > 0)
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{
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//System.Console.WriteLine("DrawerOpen");
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IsDrawerOpen = true;
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ShowLeftView(IsDrawerOpen);
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}
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else
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{
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//System.Console.WriteLine("Drawer CLOSE");
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IsDrawerOpen = false;
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ShowLeftView(IsDrawerOpen);
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}
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}
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else
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{
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ResetView();
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}
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//System.Console.WriteLine("DrawerLayout:EventActions.Up");
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break;
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}
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}
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private void moveWithPoint(CGPoint movePoint)
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{
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var x = movePoint.X;
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deltaX = x - mLastX;
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if (deltaX * deltaX > mTouchSlop * mTouchSlop)
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{
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//开始移动视图
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if (IsDrawerOpen)
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{
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//MoveAction?.Invoke(deltaX);
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MoveLeftView(deltaX);
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}
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else
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{
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if (mLastX < 10)
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{
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MoveLeftView(deltaX);
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//从屏幕左侧开始滑动，才触发
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//MoveAction?.Invoke(deltaX);
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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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/// 垂直方向滚动视图
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/// </summary>
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class MyUIDrawerLayout : UIView
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{
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public bool IsDrawerOpen = false;
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public bool IsDrawerLockMode = false;
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[Weak] internal UIDrawerLayout mUIDrawerLayout;
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public MyUIDrawerLayout(UIDrawerLayout mUIDrawerLayout)
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{
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this.mUIDrawerLayout = mUIDrawerLayout;
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}
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/// <summary>
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/// 寻找最适合的View
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/// 实现拦截
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/// </summary>
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public override UIView HitTest(CGPoint point, UIEvent uievent)
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{
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if (!IsDrawerLockMode)//不锁定，允许右滑
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{
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if (PointInside(point, uievent))
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{
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if (IsDrawerOpen)//左菜单是否打开
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{
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if (point.X > this.Frame.Size.Width - 10)
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{
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//System.Console.WriteLine($"MyUIDrawerLayout:HitTest{point.X} uievent{uievent.ToString()}");
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return this;//拦截
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}
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}
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else
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{
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if (point.X < 10)
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{
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//System.Console.WriteLine($"MyUIDrawerLayout:HitTest{point.X} uievent{uievent.ToString()}");
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return this; return this;//拦截
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}
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}
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}
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}
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return base.HitTest(point, uievent);//不拦截
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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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//System.Console.WriteLine("MyUIDrawerLayout:TouchesBegan");
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mUIDrawerLayout?.TouchEvent(EventActions.Down, (touches.AnyObject as UITouch).LocationInView(this));
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mUIDrawerLayout?.MYTouchEvent(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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mUIDrawerLayout?.TouchEvent(EventActions.Move, (touches.AnyObject as UITouch).LocationInView(this));
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mUIDrawerLayout?.MYTouchEvent(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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mUIDrawerLayout?.TouchEvent(EventActions.Up, (touches.AnyObject as UITouch).LocationInView(this));
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mUIDrawerLayout?.MYTouchEvent(EventActions.Up, (touches.AnyObject as UITouch).LocationInView(this));
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//System.Console.WriteLine("MyUIDrawerLayout:TouchesEnded");
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}
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public override void TouchesCancelled(NSSet touches, UIEvent evt)
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{
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mUIDrawerLayout?.TouchEvent(EventActions.Cancel, (touches.AnyObject as UITouch).LocationInView(this));
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mUIDrawerLayout?.MYTouchEvent(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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