gio 0.22.2

Rust bindings for the Gio library
Documentation 
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// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use crate::{AsyncResult, Cancellable, ffi};
use glib::{prelude::*, translate::*};
use std::{boxed::Box as Box_, pin::Pin};

glib::wrapper! {
    #[doc(alias = "GAsyncInitable")]
    pub struct AsyncInitable(Interface<ffi::GAsyncInitable, ffi::GAsyncInitableIface>);

    match fn {
        type_ => || ffi::g_async_initable_get_type(),
    }
}

impl AsyncInitable {
    pub const NONE: Option<&'static AsyncInitable> = None;
}

pub trait AsyncInitableExt: IsA<AsyncInitable> + 'static {
    #[doc(alias = "g_async_initable_init_async")]
    unsafe fn init_async<P: FnOnce(Result<(), glib::Error>) + 'static>(
        &self,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        unsafe {
            let main_context = glib::MainContext::ref_thread_default();
            let is_main_context_owner = main_context.is_owner();
            let has_acquired_main_context = (!is_main_context_owner)
                .then(|| main_context.acquire().ok())
                .flatten();
            assert!(
                is_main_context_owner || has_acquired_main_context.is_some(),
                "Async operations only allowed if the thread is owning the MainContext"
            );

            let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::new(glib::thread_guard::ThreadGuard::new(callback));
            unsafe extern "C" fn init_async_trampoline<
                P: FnOnce(Result<(), glib::Error>) + 'static,
            >(
                _source_object: *mut glib::gobject_ffi::GObject,
                res: *mut crate::ffi::GAsyncResult,
                user_data: glib::ffi::gpointer,
            ) {
                unsafe {
                    let mut error = std::ptr::null_mut();
                    ffi::g_async_initable_init_finish(_source_object as *mut _, res, &mut error);
                    let result = if error.is_null() {
                        Ok(())
                    } else {
                        Err(from_glib_full(error))
                    };
                    let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                        Box_::from_raw(user_data as *mut _);
                    let callback: P = callback.into_inner();
                    callback(result);
                }
            }
            let callback = init_async_trampoline::<P>;
            ffi::g_async_initable_init_async(
                self.as_ref().to_glib_none().0,
                io_priority.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    unsafe fn init_future(
        &self,
        io_priority: glib::Priority,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<(), glib::Error>> + 'static>> {
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| unsafe {
                obj.init_async(io_priority, Some(cancellable), move |res| {
                    send.resolve(res);
                });
            },
        ))
    }
}

impl<O: IsA<AsyncInitable>> AsyncInitableExt for O {}