ListView Groups with WinUI3 in WinRT/C++?

[pmintusEA]

Hi,

Apologies if this is the wrong place to ask these questions.

I have been trying out WinUI3 in both C# and C++. I can get ListView groups to bind through CollectionViewSource in C# but I have not been successful with C++.

I can get the groups to show up but not the items under the groups. I have tried binding using both "is-a-group" by inheriting from IObservableVector, and "has-a-group" by returning an IObservableVector as a property. I get the same results with both.

I have created a quick example of what I am trying to do below. This example uses "has-a-group".

https://github.com/pmintusEA/WinUI3CppListViewGroups

Thanks!

[GlenUnderwood]

I had exactly the same issue. I'm working in C++/CX so my method my not work in C++/WinRT but what I did was set the ItemsPath property of my CollectionViewSource to the name of the collection property on my group object that contains the items. The real trick, though, was that the collection property of the group object had to be defined as DependencyProperty - seems ItemsPath is meant to work only on those. So that's why I'm not sure if it'll work in C++/WinRT but I hope this helps!

[pmintusEA]

Thanks GlenUnderwood, this led me down the right path. The eventual fix I posted below.

[GlenUnderwood]

Fantastic! I think we helped each other as we will be porting over to C++/WinRT soon and your solution will help us.

[pmintusEA]

The fix was to upgrade to the latest version of the WindowsApp SDK (1.4.230811000-preview2) from 1.2.230217.4 and use the Windows.UI.Xaml.Data.Bindable attribute on the runtimeclass that contains the property containing the listview items.

Both changes were required. Simply adding the attribute to the runtimeclass on SDK version 1.2 did not fix the issue.

pmintusEA/WinUI3CppListViewGroups@7743145

[pmintusEA]

[naughtykid001]

Do you think C++ is ready for WinUi? 😓
It hesitated me with all these tiny little things.