Nested ItemsRepeater issues about avalonia.controls.itemsrepeater HOT 5 OPEN

The WinUI test app has an example of vertical stack within vertical stack, and the NavigationView also uses this for hierarchical items (tho virtualization is disabled in the NavView for some unrelated bug)

from avalonia.controls.itemsrepeater.

Nested ItemsRepeater doesn't look like a correct design. I also don't think it will work with virtualization, so you probably should disable it on StackLayout.

I would use mixed items in the source like new [] { groupHeader1, item1, item2, groupHeader2, item3, item4 }, and set different templates for headers and items with custom template factory. It will be simpler solution.

Better solution might be creating Layout, that knows about headers, and will arrange headers and items correctly. Not sure how easy it is, and if it's even possible, but it will allow setting up custom layout placement for headers and items (important for grid-like layouts).

from avalonia.controls.itemsrepeater.

Nesting ItemsRepeaters is actually recommended in the UWP docs: https://docs.microsoft.com/en-us/windows/uwp/design/controls-and-patterns/items-repeater#display-grouped-items.

from avalonia.controls.itemsrepeater.

@jp2masa interesting, I hope it's really supported by design.
Although as the example they used horizontal lists inside of the group.

from avalonia.controls.itemsrepeater.

Nesting ItemsRepeaters is actually recommended in the UWP docs: https://docs.microsoft.com/en-us/windows/uwp/design/controls-and-patterns/items-repeater#display-grouped-items.

@jp2masa interesting, I hope it's really supported by design.
Although as the example they used horizontal lists inside of the group.

Nesting ItemsRepeater MUST be supported for future "ItemsRepeater as ItemsPresenter" Avalonia plans. Nesting arbitrary controls is also a pretty fundamental XAML concept.

That said, I've seen nothing but issues with the edge cases using ItemsRepeater. I'm not even sure the fundamental design works in all theoretical edge cases. However, it seems like it should and it came from some smart minds at Microsoft. I guess it just doesn't have the mileage yet to have solved all the problems.

from avalonia.controls.itemsrepeater.