Base implementations for SemanticEffect and SemanticOrderView

[jamesmontemagno]

Description of Change

Implements SemanticEffect and SemanticOrderView based on @PureWeen's repo

Bugs Fixed

• Fixes [Spec] SemanticOrderView #1087

API Changes

Added:

• SemanticEffect
• SemanticEffectRouter
• SemanticOrderView

Behavioral Changes

PR Checklist

• Has a linked Issue, and the Issue has been approved
• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard

• Updated documentation

[jfversluis]

Hey friends! How are we looking with this one? Just checking to see if you didn't accidentally forgot to flip it to "Ready for review"

[rachelkang]

it's READYYY! :D

[pictos]

Hey friends, thanks for this really awesome! I have some comments and a question related to the video below.
When I access the effect page and turn on the ScreenReader everything works as expected, but when I go to the SemanticPage the SecreenReader breaks, as you can see there is no blue rectangle in the selected element and to make it return I need to block the screen and wait for a while. I believe that is a bug.

a11y_broken.mp4

[rachelkang]

thanks for the review @pictos! I incorporated your feedback and fixed the code :)

As for the potential bug you described - were you able to repro it on a physical device? I tried but wasn't able to repro it / think it might potentially be an emulator issue and therefore not a bug

[PureWeen]

Another thing I'd like to highlight is that in general Forms is buggy with screen readers

That's one reason we had to add this workaround
https://github.com/xamarin/XamarinCommunityToolkit/pull/1240/files#diff-77077346fa32e599b9e0c8f6bbb51a6ac2e18b4182109177f4cf48ef94c80c94R13

Once we can merge this PR into 5.0
xamarin/Xamarin.Forms#14089

A lot of behavior should smooth out once that flag is enabled

[danielmonettelli]

Hi everyone, thank you so much for adding these great accessibility APIs, I wish they were available in the documentation including how to use IA11yService.

[jamesmontemagno]

I will be working on the docs soon. Be sure to checkout https://channel9.msdn.com/Shows/XamarinShow/Improving-Accessibility-with-Xamarin-Community-Toolkit

[danielmonettelli]

Thank you very much @rachelkang @PureWeen @jamesmontemagno @jfversluis, I love that they take accessibility as a priority.