[Enhancement] Add `DrawingCompleted` Event to `DrawingView`

[jfversluis]

Summary

To support both data binding and code-behind scenarios we want to add a DrawingCompleted event next to the already existing command with the same name.

API Changes

Add:

• DrawingView.DrawingCompleted event
• DrawingCompletedEventArgs with the points that are in the drawing

Intended Use Case

For when I don't want to use data-binding

Who Will Do The Work?

• I am willing to take this on myself
• Just putting this out there for someone to pick up

[VladislavAntonyuk]

I am willing to take this on myself

[bijington]

@VladislavAntonyuk have you looked in to this yet? I was just about to send in a PR for it. Sorry I should have put my name down though. If you have started I am happy for you to proceed.

[bijington]

@VladislavAntonyuk I have gone ahead and raised my PR in a draft state as I found a potentially serious bug with the DrawingView. I am still happy for you to push your stuff and claim the PR if you had already looked in to the change 😄

[VladislavAntonyuk]

@bijington don't worry, I haven’t touched this issue. I will migrate your changes to the #1462

[bijington]

@VladislavAntonyuk Great. Sorry just to be clear does that mean I should proceed with this and you will merge later or leave this and you can pick the best bits? I see there is quite a change to #1462

[VladislavAntonyuk]

My PR is a breaking change and it will be at least in XCT 1.3.
Your changes may appear in 1.2.1.
It’s up to you.

[bijington]

@VladislavAntonyuk great thanks. I will put that decision to the maintainers @jfversluis @pictos @AndreiMisiukevich

If it does go ahead I'll be happy to assist with any merges to your stuff if you need

[TheCodeTraveler]

Thanks! However, we are no longer adding new features to Xamarin Community Toolkit, focusing on the .NET MAUI Community Toolkit.

Please open a New Feature Discussion to implement this feature in the .NET MAUI Community Toolkit.

I've posted more information about the Future Of Xamarin Community Toolkit here: https://devblogs.microsoft.com/xamarin/the-future-of-xamarin-community-toolkit/?WT.mc_id=mobile-0000-bramin