NUIApplication support (C#)

[JSUYA]

flutter-tizen C# Application inherits CoreUIApplication and provides FlutterApplication.
Can this changed to NUIApplication?

• Since both are implemented by inheriting CoreApplication, I don't think there is a problem.
• NUIApplication have been open to API4. (But I don't know if user can use NUI properly in API4.)
  https://docs.tizen.org/application/dotnet/api/TizenFX/API4/api/Tizen.NUI.NUIApplication.html
• To support FlutterView (C#) and PlatformView, NUI base app(template) should be provided.
  (Of course, for these we need to provide version template higher than API4.)

Any idea?

[swift-kim]

If you're sure that NUIApplication is supported on any Tizen device running Tizen 4.0 or above, I think we can safely change the class hierarchy of FlutterApplication without breaking existing apps.

[JSUYA]

Hi @swift-kim
I have re-check this issue to proceed with PatformView for NUI (C#).
When replacing NUIApplication, there are problems. If RendererType is EvasGL, NUIApplication cannot be used.

If replacing CoreUIApplication to NUIApplication...

• The wearable profile only supports EvasGL renderer, so users can't make c# applications.
• External outputs are only supported by EvasGL, so users using external outputs cannot make C# applications.

So we can choose either one to support this.

1. Csharp only supports the EGL renderer type. C# applications do not use ElmSharp. If users want to create a wearable app or use an external output, they need to create a cpp application.
2. Provide more options to the create command. (For example, --tizen-language + csharp_nui option or new option --tizen-ui-framework {nui, elm})
   And we can abstract the functionality of FlutterApplication class and add more templates using FlutterNUIApplication class using NUIApplication.

I can't think of a better way. If you have any good ideas or comments, please share. what do you think?

[JSUYA]

#484