Incular Docs

Controller-oriented validation — clones are stable identity, no GlobalKey needed. Form is a non-visual registry (FormState/FormController aliases).

Method	Effect
`new()` / `of_child(w)`	Empty registry, optional child
`register(controller)`	Bind a controller, returns `FormField`
`register_with_restoration`	Bind with persistence scope + key
`validate()`	Visit live fields, prune unmounted, returns `bool`
`reset()`	Restore initial text, clear errors
`save()` / `submit()`	Validate then run submit callbacks
`errors()` / `field_count()`	Inspection
`observe` / `add_listener`	React to validation changes

use incular::prelude::*;
use incular::controls_prelude::TextField;

fn main() {
    let controller = TextEditingController::with_text("");
    let form = Form::new();
    let _ = form
        .register(controller.clone())
        .validator(|text| {
            if text.is_empty() {
                Some("Required".to_string())
            } else {
                None
            }
        })
        .on_submit(|value| println!("submitted: {value}"));
    println!("valid: {}", form.validate());
    let app = Application::new(move |_cx| {
        Container::builder()
            .padding(EdgeInsets::all(24.0))
            .alignment(Alignment::CENTER)
            .child(TextField::new(controller.clone()).placeholder("Name"))
            .build()
            .into()
    })
    .expect("valid application");
    incular::run(app).expect("run application");
}

AutovalidateMode: Disabled (default) / OnUserInteraction / Always.