Added multi window support for WinUI 3

[Joost-Jens-Luminis]

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

I have added support for navigating to a view that opens in a new window. Also supports navigation inside the new window. The same viewmodel can therefore be used to navigate to from multiple different windows. (You do get a new viewmodel instance each time of course)

⤵️ What is the current behavior?

There is no multi window support

🆕 What is the new behavior (if this is a feature change)?

We will now support multiple windows.

💥 Does this PR introduce a breaking change?

No.

🐛 Recommendations for testing

The Playground app for Windows is updated with samples. I recommend testing more advanced navigation scenarios.

📝 Links to relevant issues/docs

🤔 Checklist before submitting

• All projects build
• Follows style guide lines (code style guide)
• Relevant documentation was updated (docs style guide)
• Rebased onto current develop

[Joost-Jens-Luminis]

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[Joost-Jens-Luminis]

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[Cheesebaron]

Can you please do the following:

• use file scoped namespaces on new files
• add some more description on how this works in general, since there are quite a few moving parts

[Joost-Jens-Luminis]

As requested a further description on how this works.

1. A new attribute has been added MvxNewWindowPresentationAttribute.cs has been added which can be put above views. If detected, the ViewPresenter will open a new window.

2. All navigate calls that have to support to be executed in a Window other then the main Window have to pass themselves as the Source. (Note: It is not required that they pass themselves, but is the most logical option usually).

3. An attempt is then made to find the source in any of the open windows, (before this was _rootFrame). If no window is found the mainWindow is used instead.

4. The newly created ViewModel (from the request) is then registered with the Window, so if it wants to call Navigate we can find it.

Would it help if I replace the MvxWindowsViewPresenter with the new MvxMultiWindowViewPresenter.cs

As a further note: I have updated the Playground with the new functionality.

[Joost-Jens-Luminis]

I realised over the weekend I forgot to add an explanation over the IMvxNeedWIndow.
The IMvxNeedWindow is used to give the page access to the Window it is in. This allows the page, and by extension the viewmodel via Binding, to set and change the Title and possibly other things. (We only needed it for the title :) )

[Cheesebaron]

Sorry for the delay. I need to find a Windows PC to test this one, I will try to get it reviewed this weekend.

[Joost-Jens-Luminis]

Have you been able to check it out @Cheesebaron ? Is there anything you want me to do still on this or do you have any questions/issues found?
If it helps, we are using this in production (it's in a slightly different form, but we would migrate to this if it gets in the library)

[Cheesebaron]

Sorry, was out traveling.

Will get to this one today :)