Completed
Last Updated: 21 May 2025 10:53 by ADMIN
Release 11.0.0 (2025 Q2)
Created by: Taylor
Comments: 3
Category: CollectionView
Type: Feature Request
7
Provide keyboard navigation support for CollectionView
Completed
Last Updated: 21 May 2025 10:51 by ADMIN
Release 11.0.0 (2025 Q2)
Created by: Matthew
Comments: 4
Category: CollectionView
Type: Feature Request
7

Add support for sticky group headers (iOS, Android)

This feature is available in the ListView control. E.g. On iOS using the built-in CollectionView it can be added this way:

public class CollectionViewPlatformHandler : CollectionViewHandler { /// <inheritdoc /> protected override ItemsViewLayout SelectLayout() { var layout = base.SelectLayout(); if (ItemsView.IsGrouped && layout is UICollectionViewFlowLayout flowLayout) { // Enable sticky section headers. flowLayout.SectionHeadersPinToVisibleBounds = true; } return layout; } }

Add support for scrollable index titles (iOS).

This feature is available in the ListView control. E.g. On iOS using the built-in CollectionView it can be added this way:

    public class CollectionViewPlatformHandler : CollectionViewHandler
    {
        /// <inheritdoc />
        protected override UIView CreatePlatformView()
        {
            var platformView = base.CreatePlatformView();
            if (ItemsView.IsGrouped && ItemsView.ItemsSource is IEnumerable<IGrouping<string, object>> groups && platformView.Subviews[0] is UICollectionView collectionView)
            {
                // Enable index titles.
                collectionView.DataSource = new GroupedCollectionViewDataSource(collectionView.DataSource, groups.Select(q => q.Key));
            }

            return platformView;
        }
        
        private class GroupedCollectionViewDataSource(IUICollectionViewDataSource datasource, IEnumerable<string> sections) : UICollectionViewDataSource
        {
            public override nint NumberOfSections(UICollectionView collectionView) => datasource.NumberOfSections(collectionView);
            public override nint GetItemsCount(UICollectionView collectionView, nint section) => datasource.GetItemsCount(collectionView, section);
            public override UICollectionViewCell GetCell(UICollectionView collectionView, NSIndexPath indexPath) => datasource.GetCell(collectionView, indexPath);
            public override UICollectionReusableView GetViewForSupplementaryElement(UICollectionView collectionView, NSString elementKind, NSIndexPath indexPath) => datasource.GetViewForSupplementaryElement(collectionView, elementKind, indexPath);
            public override string[] GetIndexTitles(UICollectionView collectionView) => sections.ToArray();
        }
    }
 

Note: This is available out-of-the-box on iOS 14 and above for a native UICollectionView. See documentation.

https://developer.apple.com/documentation/uikit/uicollectionviewdatasource/2851455-indextitlesforcollectionview

Unplanned
Last Updated: 21 May 2025 10:50 by Didi
Created by: Didi
Comments: 0
Category: CollectionView
Type: Feature Request
0
Add support for sticky group headers for desktop - WinUI and MacCatalyst. 
Completed
Last Updated: 21 May 2025 08:09 by ADMIN
Release 11.0.0 (2025 Q2)
Null Ref Exception occurs when calling ScrollItemIntoView at the time when navigating away from the page. 
Completed
Last Updated: 21 May 2025 08:08 by ADMIN
Release 11.0.0 (2025 Q2)
Setting the ItemViewStyle to have a Margin of any value greater than zero makes the items height to increase continuously when scrolling. 
Declined
Last Updated: 12 May 2025 06:29 by ADMIN
Created by: Malcolm
Comments: 20
Category: CollectionView
Type: Bug Report
3
Our error reporting is getting multiple of these crashes:
Message: Object reference not set to an instance of an object
Telerik.Maui.Data.LocalDataSourceProvider.ProcessCollectionChanged(NotifyCollectionChangedEventArgs e)
Telerik.Maui.Data.LocalDataSourceProvider.ProcessPendingChanges()
Telerik.Maui.Data.LocalDataSourceProvider.OnCompleted(Object sender, DataEngineCompletedEventArgs e)
Telerik.Maui.Data.ParallelDataEngine.RaiseCompleted(DataEngineCompletedEventArgs args)
Telerik.Maui.Data.ParallelDataEngine.ProcessBottomLevelsParallel(Task`1 bottomLevelResultsTask, ParallelState parallelState)
Telerik.Maui.Data.ParallelDataEngine+<>c__DisplayClass102_0.<BeginParallelProcessing>b__1(Task`1 task)
System.Threading.Tasks.ContinuationTaskFromResultTask`1[[Telerik.Maui.Data.ParallelDataEngine+GroupingResults, Telerik.Maui.Core, Version=10.0.0.0, Culture=neutral, PublicKeyToken=5803cfa389c90ce7]].InnerInvoke()
System.Threading.Tasks.Task+<>c.<.cctor>b__292_0(Object obj)
System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread , ExecutionContext , ContextCallback , Object )
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread , ExecutionContext , ContextCallback , Object )
System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& , Thread )

unfortunately we don't have a repro for this crash just yet.

It does look like it's occuring on iOS only.
Unplanned
Last Updated: 16 Apr 2025 08:11 by John

When collapsing all groups, the footer still keeps bottom position and does not align with the groups. 

In RadListView, the footer is aligned to the groups when they are collapsed. Please provide such option for the CollectionView. 

Unplanned
Last Updated: 14 Apr 2025 11:35 by Stephen

Provide a built it way to notify the parent group when the items in the nested groups are changed. 

For example, there is no PropertyChanged or CollectionChanged notification that we can hook in to in order to detect updates in parent group headers when the count changes in a subgroup. Only the leaf group headers get updated, but not the parents.

 

Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0
Steps to Reproduce

1. Create a RadCollectionView with an ObservableCollection<ButtonModel> as the ItemsSource.

2. Use a DataTemplate inside RadCollectionView.ItemTemplate to display buttons.

3. Bind button properties (IsOddClick, IsEvenClick) that should change on click.

4. Click the button inside the RadCollectionView and observe that:

5. The text updates correctly, but part of it is cut off. It seems the text does not expand 
Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0

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.

 

Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0
When removing items from the collection's item source, the group header item count does not update real time. It only updates when the GroupContext is collapsed or expanded. This would also be an issue if items are added dynamically.
Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0

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

Completed
Last Updated: 04 Apr 2025 09:50 by ADMIN
Release 10.1.0
There is a memory leak in the CollectionView on iOS/MacCatalyst - when the CollectionView control is on the page, the page does not dispose when GC runs. Same behavior happens with the RadListview.
Unplanned
Last Updated: 04 Apr 2025 06:28 by Trevor
Created by: Trevor
Comments: 0
Category: CollectionView
Type: Feature Request
5

Provide support for right-to-left flow direction: 

The current behavior is that the items

when the device language is set to an RTL language (like Hebrew or Arabic) causing the FlowDirection to be set to RightToLeft, where UI will show correctly with RTL FlowDirection, but the item's corresponding tap areas are still in the LTR positions. 

Completed
Last Updated: 17 Mar 2025 13:31 by ADMIN
Release 10.0.0 (2025 Q1)
Created by: Zelin
Comments: 17
Category: CollectionView
Type: Bug Report
7
I observe scrolling issues in the CollectionView on iOS when using Maui 9.0.30 version. 
For example the control has 25 items, I can scroll only to the first 10-11, cannot see the rest of the items.
Unplanned
Last Updated: 28 Feb 2025 14:05 by John
programmatically cause a list item template to swipe itself
Unplanned
Last Updated: 26 Feb 2025 16:35 by Elke
CollectionView item swipe doesn't work.
In Development
Last Updated: 24 Feb 2025 12:49 by ADMIN
When UseWindowSoftInputModeAdjust to Resize and keyboard closes, the CollectionView does not scroll.
Unplanned
Last Updated: 19 Feb 2025 12:34 by Ryan

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.

Unplanned
Last Updated: 05 Feb 2025 07:10 by Nathan
The RadListView Delegate sort, filter and group descriptors have bindable properties, for example: Func<object, object) KeyExtractor, Filter.
The RadCollectionView delegate descriptors use KeyLookup, Filter which type is interface and do not expose bindable properties.

the option is to implement an interface
1 2 3