I see iOS crashes in Sentry, seems like caused by clearing the RadCollectionView bound DataSource ObservableCollection, when an item was previously selected
Maui 9.0.70
Telerik 11.0
System.NullReferenceException: Arg_NullReferenceException
?, in void RadCollectionViewItemView.OnIsSelectedChanged()
?, in static RadCollectionViewItemView()+(BindableObject b, object o, object n) => { }
?, in void BindableObject.OnBindablePropertySet(BindableProperty property, object original, object value, bool didChange, bool willFirePropertyChanged)
?, in void Element.OnBindablePropertySet(BindableProperty property, object original, object value, bool changed, bool willFirePropertyChanged)
?, in void BindableObject.SetValueActual(BindableProperty property, BindablePropertyContext context, object value, bool currentlyApplying, SetValueFlags attributes, SetterSpecificity specificity, bool silent)
?, in void BindableObject.SetValueCore(BindableProperty property, object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes, SetterSpecificity specificity)
?, in void BindableObject.SetValue(BindableProperty property, object value)
?, in void RadCollectionViewItemView.set_IsSelected(bool value)
?, in void RadCollectionView.SelectContainers(IEnumerable items, bool select)
?, in void RadCollectionView.SelectionHelperSelectionChanged(object sender, RadSelectionChangedEventArgs e)
?, in void <>c__DisplayClass36_0.<SelectionChangerSelectionChanged>b__0(?)+() => { }
?, in void ActiveSelectionScope.Dispose()
?, in void SelectionHelper.ClearSelection()
?, in void RadCollectionView.Telerik.Maui.Controls.ICollectionView.ItemsChanged(NotifyCollectionChangedEventArgs e)
?, in void CollectionViewModel.OnDataProviderViewChanged(object sender, ViewChangedEventArgs e)
?, in void DataProviderBase.RaiseViewChanged(object sender, List<AddRemoveResult> changes, NotifyCollectionChangedEventArgs args, CollectionChange action, bool affectsAggregates)
?, in void LocalDataSourceProvider.ProcessCollectionChanged(NotifyCollectionChangedEventArgs e)
?, in void LocalDataSourceProvider.DataView_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
?, in void EnumerableDataSourceView.RaiseCollectionChanged(object sender, NotifyCollectionChangedEventArgs args)
?, in void EnumerableDataSourceView.ProcessCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
?, in void EnumerableDataSourceView.ProcessCollectionChangedOverride(object sender, NotifyCollectionChangedEventArgs args)
?, in void EnumerableDataSourceView.ProcessPendingCollectionChange()
?, in void DataProviderBase.RaiseViewChanging(object sender, IList changedItems, CollectionChange action)
?, in void LocalDataSourceProvider.DataView_CollectionChanging(object sender, NotifyCollectionChangedEventArgs e)
?, in void EnumerableDataSourceView.HandleCollectionChangedOverride(object sender, NotifyCollectionChangedEventArgs e)
?, in void EnumerableDataSourceView.Telerik.Maui.IWeakEventListener.ReceiveEvent(object sender, object args)
?, in void WeakEventHandlerList<NotifyCollectionChangedEventArgs>.ProcessEvent(object sender, object args)
?, in void WeakEventHandlerList<NotifyCollectionChangedEventArgs>.OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
?, in void ObservableCollection<ViewBundle>.OnCollectionChanged(NotifyCollectionChangedEventArgs)
?, in void ExtObservableCollection<ViewBundle>.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
?, in void ObservableCollection<ViewBundle>.OnCollectionReset()
?, in void ObservableCollection<ViewBundle>.ClearItems()
?, in void ExtObservableCollection<ViewBundle>.ClearItems()
?, in void Collection<ViewBundle>.Clear()
?, in void SearchViewViewModel.Dispose(bool disposing)
?, in void PropertyChangedNotifyingBase.Dispose()
?, in async void ViewBundle.Dispose(bool disposing)
?, in void <>c.<ThrowAsync>b__128_0(?)+(object state) => { }
?, in void NSAsyncSynchronizationContextDispatcher.Apply()
?, in void __Registrar_Callbacks__.callback_3311_Foundation_NSAsyncSynchronizationContextDispatcher_Apply(IntPtr pobj, IntPtr sel, IntPtr* exception_gchandle)
When having a CollectionView and navigating between different views when tapping on an item from the CollectionView, the item(s) look(s) selected.
It seems the behavior is due to the mouse over and selected visual states.
1. Bind the CheckedItems collection of the TreeView to the CollectionView ItemsSource.
2. there aren't any items in the TreeView initially. Add items to it
3. Start checking the checkboxes
4. The items are added to the CollectionView, still they are not visible in the control.
The content inside the swipe template is missing when using MAUI 9.0.40 and Telerik MAUI 10.0.0
Workaround:
Use MAUI 9.0.30 and Telerik MAUI 10.0.0
Having a RadExpander inside the ItemTemplate breaks the Drag and Drop gesture of the RadCollectionView.
When Using MAUI CollectionView and RadExpander in the template, drag and drop works.
The ItemsSource of the views is populated in the ViewModel of the page. This is done in a command that is triggered by the NavigatedTo event of the page, which is forwarded via EventToCommandBehavior from the Maui Toolkit.
When using the RadCollectionView the loaded items are no longer displayed.
When the ObservableCollection of the items is completely reconstructed and reassigned the display works.
See simple example baaaaif/CollectionViewFilterIssue (MainPage.xaml.cs) to reproduce, click hide and show
When items are filtered through a FilterDescriptor they are hidden - correct
Trying to show the previously hidden items they don't appear again as expected - bug
I've used a BooleanFilterDescriptor and a DelegateFilterDescriptor, both don't work.
Stops me from using the RadCollectionView control