cacao 0.3.2

Rust bindings for AppKit (macOS/Airyx/GNUStep, beta) and UIKit (iOS/tvOS, alpha).
Documentation 
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

use std::sync::Once;
use std::unreachable;

use objc::declare::ClassDecl;
use objc::runtime::{Class, Object, Sel};
use objc::{class, msg_send, sel, sel_impl};

use crate::foundation::load_or_register_class;
use crate::foundation::{to_bool, BOOL};
use crate::utils::load;
use crate::view::{ViewDelegate, VIEW_DELEGATE_PTR};

/// Called when the view controller receives a `viewWillAppear:` message.
extern "C" fn will_appear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: BOOL) {
    unsafe {
        let _: () = msg_send![super(this, class!(UIViewController)), viewWillAppear: animated];
    }

    let controller = load::<T>(this, VIEW_DELEGATE_PTR);
    controller.will_appear(to_bool(animated));
}

/// Called when the view controller receives a `viewDidAppear:` message.
extern "C" fn did_appear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: BOOL) {
    unsafe {
        let _: () = msg_send![super(this, class!(UIViewController)), viewDidAppear: animated];
    }

    let controller = load::<T>(this, VIEW_DELEGATE_PTR);
    controller.did_appear(to_bool(animated));
}

/// Called when the view controller receives a `viewWillDisappear:` message.
extern "C" fn will_disappear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: BOOL) {
    unsafe {
        let _: () = msg_send![super(this, class!(UIViewController)), viewWillDisappear: animated];
    }

    let controller = load::<T>(this, VIEW_DELEGATE_PTR);
    controller.will_disappear(to_bool(animated));
}

/// Called when the view controller receives a `viewDidDisappear:` message.
extern "C" fn did_disappear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: BOOL) {
    unsafe {
        let _: () = msg_send![super(this, class!(UIViewController)), viewDidDisappear: animated];
    }

    let controller = load::<T>(this, VIEW_DELEGATE_PTR);
    controller.did_disappear(to_bool(animated));
}

/// Registers an `NSViewDelegate`.
pub(crate) fn register_view_controller_class<T: ViewDelegate + 'static>(instance: &T) -> *const Class {
    load_or_register_class("UIViewController", instance.subclass_name(), |decl| unsafe {
        decl.add_ivar::<usize>(VIEW_DELEGATE_PTR);

        decl.add_method(sel!(viewWillAppear:), will_appear::<T> as extern "C" fn(&mut Object, _, BOOL));
        decl.add_method(sel!(viewDidAppear:), did_appear::<T> as extern "C" fn(&mut Object, _, BOOL));
        decl.add_method(
            sel!(viewWillDisappear:),
            will_disappear::<T> as extern "C" fn(&mut Object, _, BOOL)
        );
        decl.add_method(
            sel!(viewDidDisappear:),
            did_disappear::<T> as extern "C" fn(&mut Object, _, BOOL)
        );
    })
}