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POExpander View connected with NotifyCollectionChangedAction randomly expands items
 

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  1. POExpander View connected with NotifyCollectionChangedAction randomly expands items
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    <p>In my windows phone 8 application I've created truly observable collection for noticing when item changes in collection. Here is collection code:</p> <pre><code>public class TrulyObservableCollection&lt;T&gt; : ObservableCollection&lt;T&gt; where T : INotifyPropertyChanged { public TrulyObservableCollection() : base() { CollectionChanged += new NotifyCollectionChangedEventHandler(TrulyObservableCollection_CollectionChanged); } void TrulyObservableCollection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { if (e.NewItems != null) { foreach (Object item in e.NewItems) { var test = item as INotifyPropertyChanged; (item as INotifyPropertyChanged).PropertyChanged += new PropertyChangedEventHandler(item_PropertyChanged); } } if (e.OldItems != null) { foreach (Object item in e.OldItems) { (item as INotifyPropertyChanged).PropertyChanged -= new PropertyChangedEventHandler(item_PropertyChanged); } } } void item_PropertyChanged(object sender, PropertyChangedEventArgs e) { NotifyCollectionChangedEventArgs a = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset); OnCollectionChanged(a); } } </code></pre> <p>The situation which im going to describe happens for both controls: expander view (silverlight toolkit) and expander control (telerik controls). In my view I have list of expander views/controls. On Item tap event I would like to change something in tapped item and refresh list. Here is the code how i'm doing it:</p> <p>ViewModel:</p> <pre><code>public TrulyObservableCollection&lt;SymbolRecord&gt; Symbols {get; set;} private RelayCommand&lt;SymbolRecord&gt; tapCommand; public RelayCommand&lt;SymbolRecord&gt; TapCommand { get { return tapCommand ?? (tapCommand = new RelayCommand&lt;SymbolRecord&gt;((item) =&gt; { item.Symbol = "test"; })); } } </code></pre> <p>View:</p> <pre><code>&lt;telerikData:RadJumpList x:Name="ListControl" Grid.Row="1"IsCheckModeEnabled="False" GroupPickerItemTemplate="{StaticResource JumpListHeaderItemTemplate}" GroupHeaderTemplate="{StaticResource JumpListHeaderTemplate}" ItemsSource="{Binding Path=Symbols}" &gt; &lt;telerikData:RadJumpList.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel&gt; &lt;toolkit:ExpanderView ItemsSource="{Binding}" Expander="{Binding}" VerticalAlignment="Stretch" VerticalContentAlignment="Stretch" ExpanderTemplate="{StaticResource ExpanderControlContentTemplate}" &gt; &lt;toolkit:ExpanderView.Items&gt; &lt;TextBox Text="TEST"&gt;&lt;/TextBox&gt;&lt;/toolkit:ExpanderView.Items&gt; &lt;/toolkit:ExpanderView&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/telerikData:RadJumpList.ItemTemplate&gt; &lt;/telerikData:RadJumpList&gt; &lt;i:Interaction.Triggers&gt; &lt;i:EventTrigger EventName="ItemTap" SourceName="ListControl" &gt; &lt;cmd:EventToCommand Command="{Binding TapCommand}" CommandParameter="{Binding SelectedItem, ElementName=ListControl}" /&gt; &lt;/i:EventTrigger&gt; &lt;/i:Interaction.Triggers&gt; </code></pre> <p>When I click on item in emulator the property Symbol is changing but what's more <strong>random items are being expanded</strong>. Dont know why this is happening. Please help me</p>
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