src/XSF/Tizen.Wearable.CircularUI.Forms.Renderer/Shell/ShellSectionNavigationRenderer.cs

   1 using ElmSharp;
   2 using System;
   3 using System.Collections.Generic;
   4 using System.Linq;
   5 using System.Threading.Tasks;
   6 using Xamarin.Forms;
   7 using Xamarin.Forms.Internals;
   8 using Xamarin.Forms.Platform.Tizen;
   9 using XForms = Xamarin.Forms.Forms;
  10
  11 namespace Tizen.Wearable.CircularUI.Forms.Renderer
  12 {
  13     class SimpleViewStack : Box
  14     {
  15         EvasObject _lastTop;
  16
  17         public SimpleViewStack(EvasObject parent) : base(parent)
  18         {
  19             InternalStack = new List<EvasObject>();
  20             SetLayoutCallback(OnLayout);
  21         }
  22
  23         List<EvasObject> InternalStack { get; set; }
  24
  25         public IReadOnlyList<EvasObject> Stack => InternalStack;
  26
  27         public void Push(EvasObject view)
  28         {
  29             InternalStack.Add(view);
  30             PackEnd(view);
  31             UpdateTopView();
  32         }
  33
  34         public void Pop()
  35         {
  36             if (_lastTop != null)
  37             {
  38                 var tobeRemoved = _lastTop;
  39                 InternalStack.Remove(tobeRemoved);
  40                 UnPack(tobeRemoved);
  41                 UpdateTopView();
  42
  43                 // if Pop was called by removed page,
  44                 // Unrealize cause deletation of NativeCallback, it could be a cause of crash
  45                 Device.BeginInvokeOnMainThread(() =>
  46                 {
  47                     tobeRemoved.Unrealize();
  48                 });
  49             }
  50         }
  51
  52         public void PopToRoot()
  53         {
  54             while (InternalStack.Count > 1)
  55             {
  56                 Pop();
  57             }
  58         }
  59
  60         public void Insert(EvasObject before, EvasObject view)
  61         {
  62             view.Hide();
  63             var idx = InternalStack.IndexOf(before);
  64             InternalStack.Insert(idx, view);
  65             PackEnd(view);
  66             UpdateTopView();
  67         }
  68
  69         public void Remove(EvasObject view)
  70         {
  71             InternalStack.Remove(view);
  72             UnPack(view);
  73             UpdateTopView();
  74             Device.BeginInvokeOnMainThread(() =>
  75             {
  76                 view?.Unrealize();
  77             });
  78         }
  79
  80         void UpdateTopView()
  81         {
  82             if (_lastTop != InternalStack.LastOrDefault())
  83             {
  84                 _lastTop?.Hide();
  85                 _lastTop = InternalStack.LastOrDefault();
  86                 _lastTop.Show();
  87             }
  88         }
  89
  90         void OnLayout()
  91         {
  92             foreach (var view in Stack)
  93             {
  94                 view.Geometry = Geometry;
  95             }
  96         }
  97
  98     }
  99
 100     public class ShellSectionNavigationRenderer : IShellItemRenderer
 101     {
 102         SimpleViewStack _viewStack;
 103         IShellItemRenderer _rootPageRenderer;
 104
 105         public ShellSectionNavigationRenderer(ShellSection item)
 106         {
 107             ShellSection = item;
 108             (ShellSection as IShellSectionController).NavigationRequested += OnNavigationRequested;
 109             InitializeComponent();
 110         }
 111
 112         public ShellSection ShellSection { get; protected set; }
 113
 114         public BaseShellItem Item => ShellSection;
 115
 116         public EvasObject NativeView => _viewStack;
 117
 118         public void Dispose()
 119         {
 120             Dispose(true);
 121         }
 122
 123         protected virtual void Dispose(bool disposing)
 124         {
 125             if (disposing)
 126             {
 127                 _rootPageRenderer?.Dispose();
 128                 _viewStack?.Unrealize();
 129                 (ShellSection as IShellSectionController).NavigationRequested -= OnNavigationRequested;
 130             }
 131         }
 132
 133         void InitializeComponent()
 134         {
 135             _viewStack = new SimpleViewStack(XForms.NativeParent);
 136             _viewStack.Show();
 137
 138             _rootPageRenderer = ShellRendererFactory.Default.CreateItemRenderer(ShellSection);
 139             _viewStack.Push(_rootPageRenderer.NativeView);
 140         }
 141
 142         void OnInsertRequest(NavigationRequestedEventArgs request)
 143         {
 144             var before = Platform.GetRenderer(request.BeforePage)?.NativeView ?? null;
 145             if (before == null)
 146             {
 147                 request.Task = Task.FromException<bool>(new ArgumentException("Can't found page on stack", nameof(request.BeforePage)));
 148                 return;
 149             }
 150             var renderer = Platform.GetOrCreateRenderer(request.Page);
 151             _viewStack.Insert(before, renderer.NativeView);
 152             request.Task = Task.FromResult(true);
 153         }
 154
 155         void OnPushRequest(NavigationRequestedEventArgs request)
 156         {
 157             var renderer = Platform.GetOrCreateRenderer(request.Page);
 158             _viewStack.Push(renderer.NativeView);
 159             request.Task = Task.FromResult(true);
 160         }
 161
 162         void OnPopRequest(NavigationRequestedEventArgs request)
 163         {
 164             _viewStack.Pop();
 165             request.Task = Task.FromResult(true);
 166         }
 167
 168         void OnPopToRootRequest(NavigationRequestedEventArgs request)
 169         {
 170             _viewStack.PopToRoot();
 171             request.Task = Task.FromResult(true);
 172         }
 173
 174         void OnRemoveRequest(NavigationRequestedEventArgs request)
 175         {
 176             var renderer = Platform.GetRenderer(request.Page);
 177             if (renderer == null)
 178             {
 179                 request.Task = Task.FromException<bool>(new ArgumentException("Can't found page on stack", nameof(request.Page)));
 180                 return;
 181             }
 182             _viewStack.Remove(renderer.NativeView);
 183             request.Task = Task.FromResult(true);
 184         }
 185
 186         void OnNavigationRequested(object sender, NavigationRequestedEventArgs e)
 187         {
 188             switch (e.RequestType)
 189             {
 190                 case NavigationRequestType.Insert:
 191                     OnInsertRequest(e);
 192                     break;
 193                 case NavigationRequestType.Push:
 194                     OnPushRequest(e);
 195                     break;
 196                 case NavigationRequestType.Pop:
 197                     OnPopRequest(e);
 198                     break;
 199                 case NavigationRequestType.PopToRoot:
 200                     OnPopToRootRequest(e);
 201                     break;
 202                 case NavigationRequestType.Remove:
 203                     OnRemoveRequest(e);
 204                     break;
 205             }
 206         }
 207     }
 208 }