Modal view manager option based on ContentDialog

[rozele]

Summary

Given the AlertModule depends on ContentDialog, and it includes behaviors to queue ContentDialogs before showing them, it would be great to create a general purpose ModalViewManager based on ContentDialog that leverages the same internal queue so we can add arbitrary React view content to a ContentDialog and have the same guarantee that showing this modal while another ContentDialog is being shown will not crash the app.

Motivation

We have a number of modals in our app, and the limitation of only showing one at a time is probably not a huge issue. These are custom modals attached to the root view, and do not match the general look and feel of ContentDialogs in XAML apps (because they are just custom content). While it is possible to create a custom native module / view manager that shows ContentDialogs, it would not be "safe" to do so because it wouldn't cooperate with the AlertModule to ensure only one ContentDialog is shown at a time.

Basic Example

No response

Open Questions

No response

[asklar]

There is a request to implement Modal #2989 but we haven't done so yet.
I think the request boils down to either:
1- a native modal control that allows multiple instances simultaneously, and expose it to JS, or
2- an API to query / set whether modal dialogs are showing, and events to be notified when this changes, so that apps/modules can coordinate when to show the modal dialog / alert

The first one sounds like it would be a good thing to fix in XAML itself, since brownfield apps (with native components in them) could be using ContentDialog directly, and run into crashes this way. Can you file an issue in the winui repo?

[rozele]

I'll close this one anyway, especially because I forgot that there are various XAML Islands issues with ContentDialog :)