Ambiguity Between IView.Arrange() and VisualElement.Arrange()

[bradencohen]

Description

This is super low priority, just a "gotcha" I ran into that I thought was worth mentioning.

When implementing a custom LayoutManager and invoking the Arrange method during the ArrangeOverride phase, there's a potential ambiguity between two methods:

1. VisualElement.Arrange() (from VisualElement class)
2. IView.Arrange() (from IView interface)

Seemingly, only the IView.Arrange() method works correctly within the context of a LayoutManager.

For example, this doesn't work:

 CustomView.TitleLabel.Arrange( destination );

But this does:

( ( IView ) CustomView.TitleLabel ).Arrange( destination );

It took me a decent time debugging to figure out why none of my items were getting arranged on the screen, so at a worst case hopefully this can help some people out. Even if there isn't a fix it might be useful to call this out when the custom layout manager documentation is released.

If I'm misunderstanding something, please let me know, I'm still learning 😄.

Steps to Reproduce

1. Create a custom layout manager
2. Within that layout manager, call .Arrange() on a VisualElement without hard-casting to IView

Link to public reproduction project repository

No response

Version with bug

8.0.0-preview.7.8842

Is this a regression from previous behavior?

No, this is something new

Last version that worked well

Unknown/Other

Affected platforms

I was not able test on other platforms

Affected platform versions

Not really relevant

Did you find any workaround?

Yes, hard cast to IView

Relevant log output

No response

[ghost]

We've added this issue to our backlog, and we will work to address it as time and resources allow. If you have any additional information or questions about this issue, please leave a comment. For additional info about issue management, please read our Triage Process.

[jsuarezruiz]

@hartez Thoughts?