INNER CODE UNIT · Rust

Picked

jub0t/Concat · src/crates/concat-android/src/lib.rs:121

    type Picked = Box<dyn FnOnce(Vec<PathBuf>) + Send>;

    /// The pick in flight, waiting for Java to answer.
    static PENDING: Mutex<Option<Picked>> = Mutex::new(None);
    /// The fragment class, loaded once and kept.
    static CLASS: OnceLock<Global<JClass<'static>>> = OnceLock::new();

    /// Hands the window's crate a picker that runs on this activity.
    pub fn install(app: &AndroidApp) {
        let app = app.clone();
        concat::install_file_picker(Box::new(move |on_picked| {
            let previous = PENDING
                .lock()
                .map(|mut slot| slot.replace(on_picked))
                .ok()
                .flatten();
            if let Some(previous) = previous {
                // A pick was already up; the one that asked first is told

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