Implement screen reader support using AccessKit library.

[bruvzg]

Initial implementation of the AccessKit integration use C-API:

All base (non-editor) controls except GraphEditor should work now. UI behavior without active screen reader should be unchanged. When screen reader is running, some controls that normally do not can accept keyboard focus (Label, RTL, TabBar) and extra keyboard actions (switching tabs, selecting RTL paragraph and embedded images/tables, selecting embedded TreeItem buttons).

Additionally, provides access to some accessibility related OS settings (high contrast, reduce animation, reduce transparency and screen reader status)

Screen recordings (updated)

2023-06-02.13-13-41.mp4

Expects accesskit_sdk_path command line argument or environment variable with the path to the pre-build AccessKit-C 0.9.0 folder.

Supersede #72886
Fixes #58074
Implements godotengine/godot-proposals#983 (partial)
Implements godotengine/godot-proposals#1964

[ashleygrobler04]

Hi there. is the main editor supposed to work with screen readers as of yet? or only games?
Thanks a lot for all the effort.

[bruvzg]

Hi there. is the main editor supposed to work with screen readers as of yet? or only games?
Thanks a lot for all the effort.

Standard controls used in the editor should work, but the editor have a lot of custom elements. For most of them (like 2D/3D canvas editor), it will be really hard (if possible) to implement accessibility.

[ashleygrobler04]

Hi, thanks. How do I enable the accessibility? I managed to compile it from source. Based on the code it looks like the accessibility or screen reader should be detected automaticly... When I am in the editor and I use the tab and arrow keys, it doesn't speak anything.

[Ali-Bueno]

Hello. Would be possible for the future make context menus (like the menu bar) readable for screen readers? currently it only announces menu bar and it reads nothing, and that was possible with the old godot 3.2 with nolan's plugin. If yes, that would be very great, as with this current version, almost all is readable, but to start to messing with this as I did before with nolan's plugins, we need that the context menus become accessible/readable. thanks much!