1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146

use crate::SaveDelegate;
use glib::subclass::prelude::*;
use glib::thread_guard::ThreadGuard;
use glib::translate::*;
use glib::Cast;
use std::{future::Future, pin::Pin};

pub trait SaveDelegateImpl: ObjectImpl {
    fn save_future(
        &self,
        delegate: &Self::Type,
    ) -> Pin<Box<dyn Future<Output = Result<(), glib::Error>> + 'static>> {
        self.parent_save_future(delegate)
    }
}

pub trait SaveDelegateImplExt: ObjectSubclass {
    fn parent_save_future(
        &self,
        delegate: &Self::Type,
    ) -> Pin<Box<dyn Future<Output = Result<(), glib::Error>> + 'static>>;
}

impl<T: SaveDelegateImpl> SaveDelegateImplExt for T {
    fn parent_save_future(
        &self,
        delegate: &Self::Type,
    ) -> Pin<Box<dyn Future<Output = Result<(), glib::Error>> + 'static>> {
        unsafe {
            let type_data = T::type_data();
            let parent_class =
                type_data.as_ref().parent_class() as *mut ffi::PanelSaveDelegateClass;
            let save_async = (*parent_class)
                .save_async
                .expect("No parent class implementation for \"save_async\"");

            unsafe extern "C" fn parent_save_async_callback<T>(
                source_object: *mut glib::gobject_ffi::GObject,
                res: *mut gio::ffi::GAsyncResult,
                user_data: glib::ffi::gpointer,
            ) where
                T: SaveDelegateImpl,
            {
                let type_data = T::type_data();
                let parent_class =
                    type_data.as_ref().parent_class() as *mut ffi::PanelSaveDelegateClass;
                let save_finish = (*parent_class)
                    .save_finish
                    .expect("No parent class implementation for \"save_finish\"");

                let ret: Box<ThreadGuard<gio::GioFutureResult<(), glib::Error>>> =
                    Box::from_raw(user_data as *mut _);
                let ret = ret.into_inner();

                let mut error = std::ptr::null_mut();
                save_finish(source_object as *mut _, res, &mut error);
                let result = if error.is_null() {
                    Ok(())
                } else {
                    Err(from_glib_full(error))
                };

                ret.resolve(result);
            }

            Box::pin(gio::GioFuture::new(
                delegate,
                move |obj, cancellable, res| {
                    let user_data = Box::new(ThreadGuard::new(res));
                    save_async(
                        obj.unsafe_cast_ref::<SaveDelegate>().to_glib_none().0,
                        cancellable.to_glib_none().0,
                        Some(parent_save_async_callback::<T>),
                        Box::into_raw(user_data) as *mut _,
                    );
                },
            ))
        }
    }
}

unsafe impl<T: SaveDelegateImpl> IsSubclassable<T> for SaveDelegate {
    fn class_init(class: &mut ::glib::Class<Self>) {
        Self::parent_class_init::<T>(class);
        let klass = class.as_mut();
        klass.save_async = Some(save_delegate_save_async::<T>);
        klass.save_finish = Some(save_delegate_save_finish::<T>);
    }
}

unsafe extern "C" fn save_delegate_save_async<T: SaveDelegateImpl>(
    delegate: *mut ffi::PanelSaveDelegate,
    cancellable: *mut gio::ffi::GCancellable,
    callback: gio::ffi::GAsyncReadyCallback,
    user_data: glib::ffi::gpointer,
) {
    let instance = &*(delegate as *mut T::Instance);
    let imp = instance.imp();
    let delegate: SaveDelegate = from_glib_none(delegate);
    let cancellable: Option<gio::Cancellable> = from_glib_none(cancellable);

    let fut = imp.save_future(delegate.unsafe_cast_ref());
    glib::MainContext::default().spawn_local(async move {
        let res = fut.await;
        if let Some(callback) = callback {
            let t = gio::LocalTask::new(
                Some(delegate.upcast_ref::<glib::Object>()),
                cancellable.as_ref(),
                move |task: gio::LocalTask<bool>, source_object: Option<&glib::Object>| {
                    let result: *mut gio::ffi::GAsyncResult =
                        task.upcast_ref::<gio::AsyncResult>().to_glib_none().0;
                    let source_object: *mut glib::object::GObject = source_object.to_glib_none().0;
                    callback(source_object, result, user_data)
                },
            );
            t.return_result(res.map(|_| true));
        }
    });
}

unsafe extern "C" fn save_delegate_save_finish<T: SaveDelegateImpl>(
    delegate: *mut ffi::PanelSaveDelegate,
    res: *mut gio::ffi::GAsyncResult,
    error: *mut *mut glib::ffi::GError,
) -> glib::ffi::gboolean {
    let delegate = from_glib_borrow::<_, SaveDelegate>(delegate);
    let res: gio::AsyncResult = from_glib_none(res);
    let t = res.downcast::<gio::LocalTask<bool>>().unwrap();
    assert!(gio::LocalTask::<bool>::is_valid(
        &t,
        Some(delegate.as_ref())
    ));
    let ret = t.propagate();
    match ret {
        Ok(v) => {
            assert!(v);
            true.into_glib()
        }
        Err(e) => {
            if !error.is_null() {
                *error = e.into_raw();
            }
            false.into_glib()
        }
    }
}