using System;
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using UIKit;
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using Shared.IO;
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using CoreGraphics;
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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
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/// </summary>
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public class PageLayout : ViewGroup
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{
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readonly MyPageLayout iosUIScrolView;
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readonly UIPageControl iosUIPageControl;
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/// <summary>
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/// 页面变化事件
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/// </summary>
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public Action<PageLayout,int> PageChange;
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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 MyPageLayout : UIScrollView
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{
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[Weak] PageLayout pageLayout;
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public MyPageLayout(PageLayout pageLayout)
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{
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this.pageLayout = pageLayout;
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DecelerationEnded += (s, e) =>
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{
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var tempUIScrolView = s as MyPageLayout;
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//获取当前界面的索引
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var tempPageIndex = Convert.ToInt32(tempUIScrolView.ContentOffset.X / tempUIScrolView.Frame.Width);
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//通知界面索引变化
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if (this.pageLayout.pageIndex != tempPageIndex)
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{
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this.pageLayout.pageIndex = tempPageIndex;
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this.pageLayout.iosUIPageControl.CurrentPage = tempPageIndex;
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this.pageLayout.PageChange?.Invoke(this.pageLayout, this.pageLayout.pageIndex);
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}
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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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pageLayout?.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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pageLayout?.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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pageLayout?.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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pageLayout?.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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if (view.ToString().Contains("UIScrollViewScrollIndicator"))
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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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/// 构造函数
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/// </summary>
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public PageLayout()
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{
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viewGroup = new UIView();
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iosUIPageControl = new UIPageControl { Enabled = false };
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iosUIScrolView = new MyPageLayout(this) { };
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realViewGroup = iosUIScrolView;
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var frame = iosUIPageControl.Frame;
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frame.Height = 16;
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iosUIPageControl.Frame = frame;
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//启动翻页功能
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iosUIScrolView.PagingEnabled = true;
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iosUIScrolView.Bounces = false;
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iosUIScrolView.ShowsHorizontalScrollIndicator = false;
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viewGroup.AddSubview(iosUIScrolView);
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viewGroup.AddSubview(iosUIPageControl);
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}
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/// <summary>
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/// 是否显示下面一排的点
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/// </summary>
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/// <value><c>true</c> if is show point; otherwise, <c>false</c>.</value>
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public bool IsShowPoint
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{
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get
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{
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return !iosUIPageControl.Hidden;
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}
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set
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{
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iosUIPageControl.Hidden = !value;
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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 (iosUIScrolView as MyPageLayout).ScrollEnabled;
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}
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set
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{
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(iosUIScrolView as MyPageLayout).ScrollEnabled = value;
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}
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}
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int pageIndex;
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/// <summary>
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/// 设置或者获取当前的界面索引
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/// </summary>
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/// <value>The index of the page.</value>
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public int PageIndex
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{
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get
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{
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return pageIndex;
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}
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set
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{
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if (value < 0 || ChildrenCount <= value)
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{
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return;
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}
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int beforePageIndex = pageIndex;
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pageIndex = value;
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if (!IsCanRefresh)
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{
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return;
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}
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var viewSize = iosUIScrolView.Frame.Size;
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var rect = new CGRect(pageIndex * viewSize.Width, 0, viewSize.Width, viewSize.Height);
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iosUIScrolView.ScrollRectToVisible(rect, false);
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if (beforePageIndex != pageIndex)
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{
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iosUIPageControl.CurrentPage = pageIndex;
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PageChange?.Invoke(this, pageIndex);
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}
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}
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}
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/// <summary>
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/// 增加子控件
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/// </summary>
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/// <param name="view">View.</param>
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public override void AddChidren(View view)
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{
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//var v = Application.AverageScale;
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//var vv = Application.CurrentHeight;
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//var dddd = Application.DesignWidth;
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base.AddChidren(view);
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iosUIPageControl.Pages = ChildrenCount;
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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 (iosUIScrolView.Subviews.Length == 0)
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{
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return;
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}
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for (int i = 1; i < iosUIScrolView.Subviews.Length; i++)
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{
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var frame = iosUIScrolView.Subviews[i].Frame;
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frame.X = iosUIScrolView.Subviews[i - 1].Frame.Right;
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iosUIScrolView.Subviews[i].Frame = frame;
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}
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iosUIScrolView.ContentSize = new CoreGraphics.CGSize(iosUIScrolView.Subviews[iosUIScrolView.Subviews.Length - 1].Frame.Right, iosUIScrolView.Frame.Height);
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}
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/// <summary>
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/// 控件宽度
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/// </summary>
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/// <value>The width.</value>
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public override int Width
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{
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get
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{
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return base.Width;
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}
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set
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{
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base.Width = value;
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if (!IsCanRefresh)
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return;
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var frame = iosUIPageControl.Frame;
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frame.Width = Width;
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iosUIPageControl.Frame = frame;
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}
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}
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/// <summary>
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/// 控件的高度
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/// </summary>
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/// <value>The height.</value>
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public override int Height
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{
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get
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{
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return base.Height;
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}
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set
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{
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base.Height = value;
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if (!IsCanRefresh)
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return;
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var frame = iosUIPageControl.Frame;
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frame.Y = Height - frame.Height;
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iosUIPageControl.Frame = frame;
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}
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}
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/// <summary>
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/// 移除当前控件
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/// </summary>
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/// <param name="view">View.</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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PageIndex = ChildrenCount - 1;
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iosUIPageControl.Pages = ChildrenCount;
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iosUIPageControl.CurrentPage = PageIndex;
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}
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/// <summary>
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/// 移除所有的控件
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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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iosUIPageControl.Pages = 0;
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PageIndex = 0;
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iosUIPageControl.CurrentPage = 0;
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}
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/// <summary>
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/// 根据索引移除控件
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/// </summary>
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/// <param name="index">Index.</param>
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public override void RemoveAt(int index)
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{
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Remove(viewList[index]);
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}
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}
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}
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