1+ using System . Collections . ObjectModel ;
2+ using System . Threading . Tasks ;
3+ using System . Windows . Input ;
4+ using Xamarin . Forms . CustomAttributes ;
5+ using Xamarin . Forms . Internals ;
6+
7+ #if UITEST
8+ using Xamarin . Forms . Core . UITests ;
9+ using Xamarin . UITest ;
10+ using NUnit . Framework ;
11+ #endif
12+
13+ namespace Xamarin . Forms . Controls . Issues
14+ {
15+ [ Preserve ( AllMembers = true ) ]
16+ [ Issue ( IssueTracker . Bugzilla , 8392 , "[Bug] CollectionView does not marshal ObservableCollection.CollectionChanged to MainThread" ) ]
17+ public class Issue8392 : TestContentPage
18+ {
19+ public Issue8392 ( )
20+ {
21+ Title = "Issue 8392" ;
22+
23+ var collectionView = new CollectionView
24+ {
25+ ItemTemplate = new Issue8392DataTemplate ( )
26+ } ;
27+
28+ collectionView . SetBinding ( ItemsView . ItemsSourceProperty , nameof ( Issue8392ViewModel . DataList ) ) ;
29+
30+ var refreshView = new RefreshView
31+ {
32+ Content = collectionView
33+ } ;
34+
35+ refreshView . SetBinding ( RefreshView . IsRefreshingProperty , nameof ( Issue8392ViewModel . IsRefreshing ) ) ;
36+ refreshView . SetBinding ( RefreshView . CommandProperty , nameof ( Issue8392ViewModel . PullToRefreshCommand ) ) ;
37+
38+ Content = refreshView ;
39+
40+ BindingContext = new Issue8392ViewModel ( ) ;
41+ }
42+
43+ protected override void Init ( )
44+ {
45+
46+ }
47+
48+ protected override void OnAppearing ( )
49+ {
50+ base . OnAppearing ( ) ;
51+
52+ if ( Content is RefreshView refreshView
53+ && refreshView . Content is CollectionView )
54+ {
55+ refreshView . IsRefreshing = true ;
56+ }
57+ }
58+ }
59+
60+ [ Preserve ( AllMembers = true ) ]
61+ public class Issue8392DataTemplate : DataTemplate
62+ {
63+ public Issue8392DataTemplate ( ) : base ( CreateTemplate )
64+ {
65+ }
66+
67+ static Layout CreateTemplate ( )
68+ {
69+ var numberLabel = new Label
70+ {
71+ FontSize = 14 ,
72+ HorizontalOptions = LayoutOptions . Start ,
73+ VerticalOptions = LayoutOptions . Center ,
74+ HorizontalTextAlignment = TextAlignment . Start ,
75+ VerticalTextAlignment = TextAlignment . Center ,
76+ } ;
77+ numberLabel . SetBinding ( Label . TextProperty , nameof ( Issue8392Model . Number ) ) ;
78+
79+ var grid = new Grid
80+ {
81+ RowDefinitions =
82+ {
83+ new RowDefinition { Height = new GridLength ( 20 , GridUnitType . Absolute ) }
84+ } ,
85+ ColumnDefinitions =
86+ {
87+ new ColumnDefinition { Width = new GridLength ( 1 , GridUnitType . Star ) }
88+ }
89+ } ;
90+
91+ grid . Children . Add ( numberLabel , 0 , 0 ) ;
92+
93+ return grid ;
94+ }
95+ }
96+
97+ public class Issue8392Model
98+ {
99+ public Issue8392Model ( int number ) => Number = number ;
100+
101+ public int Number { get ; }
102+ }
103+
104+ [ Preserve ( AllMembers = true ) ]
105+ public class Issue8392ViewModel : BindableObject
106+ {
107+ bool _isRefreshing ;
108+
109+ public ICommand PullToRefreshCommand => new Command ( async ( ) => await ExecutePullToRefreshCommand ( ) ) ;
110+
111+ public bool IsRefreshing
112+ {
113+ get { return _isRefreshing ; }
114+ set
115+ {
116+ _isRefreshing = value ;
117+ OnPropertyChanged ( ) ;
118+ }
119+ }
120+
121+ public ObservableCollection < Issue8392Model > DataList { get ; } = new ObservableCollection < Issue8392Model > ( ) ;
122+
123+ async Task ExecutePullToRefreshCommand ( )
124+ {
125+ DataList . Clear ( ) ;
126+
127+ try
128+ {
129+ // If the items load without exception, the test has passed.
130+ for ( int i = 0 ; i < 30 ; i ++ )
131+ {
132+ await Task . Delay ( 200 ) . ConfigureAwait ( false ) ;
133+ DataList . Add ( new Issue8392Model ( i + 1 ) ) ;
134+ }
135+ }
136+ finally
137+ {
138+ IsRefreshing = false ;
139+ }
140+ }
141+ }
142+ }
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