Implement basic accessibility (a11y) support, using the Qt backend.
_This should get us started, but accessibility support is an additional way to interact with UIs that is very different from the "graphical way" most users will interact with the UI. No single PR will "make a toolkit accessibility", this needs to be an ongoing effort!_
Parts of this PR:
* Add functions to access a11y-related properties to Component
* Add helper functions to Item struct
* Handle accessible- properties in the compiler
* Add documentation, add description, enforce some basic rules
* Make the Text element accessible by default
* Don't optimize away accessibility property in the LLR
* Ensure that accessibility property are marked as used
* Add some accessibility properties to the native style widgets
* Support for bool and integer `accessible` properties
* Implement basic support for accessibility
* Make basic widgets accessible by default
* Make slider focus-able and interactable with keyboard
* Tell a11y layer about value changes
* Generate QAccessible constants using bindgen
* Don't expose the `accessible` properties when using the MCU backend: There is no backend to make use of them
* Handle focus change based on keyboard focus of the window
* Report accessible widgets at correct positions
* Allow for (virtual) focus delegation at the a11y level
* Calculate value step size dynamically
* Make sure to not send notifications to a11y backend about dead objects
Qt implementation only keep one stop if two are at the same location.
So mangle the stop position to be sure they are all at sligntly different position
* Hack to make Qt not close newly opened popups when running on Windows
Windows sends a mouse release event after the close event when running
on windows. This confuses our hack to close popups!
So hack around the problem by ignoring any mouse button release event
that does not follow a mouse button press event. I hope this will
not couse too many side effects.
Fixes: #1211
* Update internal/backends/qt/qt_window.rs
Co-authored-by: Olivier Goffart <olivier@woboq.com>
Co-authored-by: Olivier Goffart <olivier@woboq.com>
cbindgen 0.21 was released which contains https://github.com/eqrion/cbindgen/pull/724
which allow to use raw identifier in enums shared with C++.
So now we can have `MouseCursor.move` in slint despite it being a rust keyword
Note that the strum macro also have trouble with the raw identifier, so we
take that in account in the conversion functions in the interpreter
The README.md contains the warning that used to be in lib.rs.
Add README.md files to all internal crates
... pointing to the official public crate to use instead.
Rename internal crates
fixup: README files
fixup rename
