src/XSF/Xamarin.Forms.Core/SwipeView.cs

   1 using System;
   2 using System.ComponentModel;
   3 using System.Runtime.CompilerServices;
   4 using Xamarin.Forms.Platform;
   5
   6 namespace Xamarin.Forms
   7 {
   8         [ContentProperty("Content")]
   9         [RenderWith(typeof(_SwipeViewRenderer))]
  10         public class SwipeView : ContentView, IElementConfiguration<SwipeView>, ISwipeViewController
  11         {
  12                 readonly Lazy<PlatformConfigurationRegistry<SwipeView>> _platformConfigurationRegistry;
  13
  14                 public SwipeView()
  15                 {
  16                         _platformConfigurationRegistry = new Lazy<PlatformConfigurationRegistry<SwipeView>>(() => new PlatformConfigurationRegistry<SwipeView>(this));
  17                 }
  18
  19                 [EditorBrowsable(EditorBrowsableState.Never)]
  20                 public static void VerifySwipeViewFlagEnabled(
  21                         string constructorHint = null,
  22                         [CallerMemberName] string memberName = "")
  23                 {
  24                         ExperimentalFlags.VerifyFlagEnabled(nameof(SwipeView), ExperimentalFlags.SwipeViewExperimental, memberName: memberName);
  25                 }
  26
  27                 public static readonly BindableProperty LeftItemsProperty =
  28                         BindableProperty.Create(nameof(LeftItems), typeof(SwipeItems), typeof(SwipeView), null, BindingMode.OneWay, null, defaultValueCreator: SwipeItemsDefaultValueCreator,
  29                                 propertyChanged: OnSwipeItemsChanged);
  30
  31                 public static readonly BindableProperty RightItemsProperty =
  32                         BindableProperty.Create(nameof(RightItems), typeof(SwipeItems), typeof(SwipeView), null, BindingMode.OneWay, null, defaultValueCreator: SwipeItemsDefaultValueCreator);
  33
  34                 public static readonly BindableProperty TopItemsProperty =
  35                         BindableProperty.Create(nameof(TopItems), typeof(SwipeItems), typeof(SwipeView), null, BindingMode.OneWay, null, defaultValueCreator: SwipeItemsDefaultValueCreator);
  36
  37                 public static readonly BindableProperty BottomItemsProperty =
  38                         BindableProperty.Create(nameof(BottomItems), typeof(SwipeItems), typeof(SwipeView), null, BindingMode.OneWay, null, defaultValueCreator: SwipeItemsDefaultValueCreator);
  39
  40                 public SwipeItems LeftItems
  41                 {
  42                         get { return (SwipeItems)GetValue(LeftItemsProperty); }
  43                         set { SetValue(LeftItemsProperty, value); }
  44                 }
  45
  46                 public SwipeItems RightItems
  47                 {
  48                         get { return (SwipeItems)GetValue(RightItemsProperty); }
  49                         set { SetValue(RightItemsProperty, value); }
  50                 }
  51
  52                 public SwipeItems TopItems
  53                 {
  54                         get { return (SwipeItems)GetValue(TopItemsProperty); }
  55                         set { SetValue(TopItemsProperty, value); }
  56                 }
  57
  58                 public SwipeItems BottomItems
  59                 {
  60                         get { return (SwipeItems)GetValue(BottomItemsProperty); }
  61                         set { SetValue(BottomItemsProperty, value); }
  62                 }
  63
  64                 static void OnSwipeItemsChanged(BindableObject bindable, object oldValue, object newValue)
  65                 {
  66                         ((SwipeView)bindable).UpdateSwipeItemsParent((SwipeItems)newValue);
  67                 }
  68
  69                 public event EventHandler<SwipeStartedEventArgs> SwipeStarted;
  70                 public event EventHandler<SwipeChangingEventArgs> SwipeChanging;
  71                 public event EventHandler<SwipeEndedEventArgs> SwipeEnded;
  72                 public event EventHandler CloseRequested;
  73
  74                 public void Close()
  75                 {
  76                         CloseRequested?.Invoke(this, EventArgs.Empty);
  77                 }
  78
  79                 void ISwipeViewController.SendSwipeStarted(SwipeStartedEventArgs args) => SwipeStarted?.Invoke(this, args);
  80
  81                 void ISwipeViewController.SendSwipeChanging(SwipeChangingEventArgs args) => SwipeChanging?.Invoke(this, args);
  82
  83                 void ISwipeViewController.SendSwipeEnded(SwipeEndedEventArgs args) => SwipeEnded?.Invoke(this, args);
  84
  85                 protected override void OnBindingContextChanged()
  86                 {
  87                         base.OnBindingContextChanged();
  88
  89                         object bc = BindingContext;
  90
  91                         if (LeftItems != null)
  92                                 SetInheritedBindingContext(LeftItems, bc);
  93
  94                         if (RightItems != null)
  95                                 SetInheritedBindingContext(RightItems, bc);
  96
  97                         if (TopItems != null)
  98                                 SetInheritedBindingContext(TopItems, bc);
  99
 100                         if (BottomItems != null)
 101                                 SetInheritedBindingContext(BottomItems, bc);
 102                 }
 103
 104                 SwipeItems SwipeItemsDefaultValueCreator() => new SwipeItems();
 105
 106                 static object SwipeItemsDefaultValueCreator(BindableObject bindable)
 107                 {
 108                         return ((SwipeView)bindable).SwipeItemsDefaultValueCreator();
 109                 }
 110
 111                 public IPlatformElementConfiguration<T, SwipeView> On<T>() where T : IConfigPlatform
 112                 {
 113                         return _platformConfigurationRegistry.Value.On<T>();
 114                 }
 115
 116                 void UpdateSwipeItemsParent(SwipeItems swipeItems)
 117                 {
 118                         swipeItems.Parent = this;
 119
 120                         foreach (var swipeItem in swipeItems)
 121                                 ((VisualElement)swipeItem).Parent = swipeItems;
 122                 }
 123         }
 124 }