Add support for the Developer Tools window in Avalonia controls embedded to Windows Forms

[xfortin-devolutions]

Is your feature request related to a problem? Please describe.

We are progressively integrating Avalonia UI elements to our WinForms application and, because of this, we setup Avalonia without a Lifetime, which prevents attaching the DevTools (AttachDevTools) for the whole application. It still works if we attach it on a per-Window basis, but I expect us to end up with a lot of UserControl embedded directly in Windows Forms (and View/Window for macOS, and for GTK in Linux).

Describe the solution you'd like

It would be nice to be able to open the DevTools for Avalonia UserControls embedded to WinForms with WinFormsAvaloniaControlHost.

The same would then apply to EmbeddableControlRoot in Mac and whatever it is for Linux (XEmbedPlug?)

Describe alternatives you've considered

No response

Additional context

No response

[maxkatz6]

It is already supported via this method:
public static void AttachDevTools(this TopLevel root)

[xfortin-devolutions]

@maxkatz6 Neither WinFormsAvaloniaControlHost nor UserControls are TopLevel object though, no?

This is the method I use for the windows though.

[maxkatz6]

@xfortin-devolutions inside of the Avalonia control code, "avaloniaView" code in your case, you can call TopLevel.GetTopLevel(control). Note, it should be done when control has attached to the visual tree.

[xfortin-devolutions]

@maxkatz6 Yep! This works, thanks!