Incular Docs

Directionality { text_direction: TextDirection, child: Widget } sets the ambient reading direction that AlignmentDirectional, EdgeInsetsDirectional, and RTL-aware placement resolve against.

use incular::prelude::*;

fn main() {
    let scope = Directionality::new(TextDirection::Rtl, Text::new("مرحبا"));
    println!("dir: {:?}", scope.text_direction());
    let app = Application::new(|_cx| {
        Directionality::new(
            TextDirection::Rtl,
            Text::new("مرحبا"),
        ).into()
    })
    .expect("valid application");
    incular::run(app).expect("run application");
}

TextDirection: Ltr (default) / Rtl. Widget text_direction fields default to None and inherit from the nearest Directionality (else Ltr).