lento 0.1.1

Cross platform ui framework
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

use std::cell::{Cell, RefCell};
use std::ptr::null_mut;
use std::sync::{Arc, Condvar, Mutex, OnceLock};
use winit::event_loop::{ActiveEventLoop, EventLoopClosed, EventLoopProxy};
use crate::app::{App, AppEvent, AppEventPayload};
use crate::base::{UnsafeFnMut, UnsafeFnOnce};

thread_local! {
    pub static ACTIVE_EVENT_LOOP: Cell<*const ActiveEventLoop> = Cell::new(null_mut());
    pub static STATIC_EVENT_LOOP_PROXY: RefCell<Option<AppEventProxy>> = RefCell::new(None);
}

#[derive(Clone)]
pub struct AppEventProxy {
    proxy: EventLoopProxy<AppEventPayload>,
}

//TODO use ResultWaiter?
pub struct AppEventResult {
    lock: Arc<(Mutex<bool>, Condvar)>,
}

impl AppEventResult {
    pub fn wait(&self) {
        let (lock, cvar) = &*self.lock;
        let mut done = lock.lock().unwrap();
        while !*done {
            done = cvar.wait(done).unwrap();
        }
    }
}

impl AppEventProxy {

    pub fn new(proxy: EventLoopProxy<AppEventPayload>) -> AppEventProxy {
        Self { proxy }
    }

    pub fn send_event(&self, event: AppEvent) -> Result<AppEventResult, EventLoopClosed<AppEventPayload>> {
        let lock = Arc::new((Mutex::new(false), Condvar::new()));
        let lock2 = Arc::clone(&lock);
        self.proxy.send_event(AppEventPayload {
            event,
            lock,
        })?;
        Ok(AppEventResult {
            lock: lock2,
        })
    }
}

pub struct EventLoopCallback {
    event_loop_proxy: AppEventProxy,
    callback: Option<UnsafeFnOnce>,
}

impl EventLoopCallback {
    pub fn call(mut self) {
        let mut callback = self.callback.take().unwrap();
        self.event_loop_proxy.send_event(AppEvent::Callback(Box::new(|| {
            callback.call();
        }))).unwrap();
    }
}

#[derive(Clone)]
pub struct EventLoopFnMutCallback<P> {
    event_loop_proxy: AppEventProxy,
    callback: Arc<Mutex<UnsafeFnMut<P>>>,
}

impl<P: Send + Sync + 'static> EventLoopFnMutCallback<P> {
    pub fn call(&mut self, param: P) {
        let cb = self.callback.clone();
        self.event_loop_proxy.send_event(AppEvent::Callback(Box::new(move || {
            let mut cb = cb.lock().unwrap();
            (cb.callback)(param);
        })));
    }
}

pub fn create_event_loop_callback<F: FnOnce() + 'static>(callback: F) -> EventLoopCallback {
    let callback = unsafe { UnsafeFnOnce::new(callback) };
    let event_loop_proxy = create_event_loop_proxy();
    EventLoopCallback {
        event_loop_proxy,
        callback: Some(callback)
    }
}

pub fn create_event_loop_fn_mut<P: Send + Sync, F: FnMut(P) + 'static>(callback: F) -> EventLoopFnMutCallback<P> {
    let fn_mut = UnsafeFnMut {
        callback: Box::new(callback)
    };
    let event_loop_proxy = create_event_loop_proxy();
    EventLoopFnMutCallback {
        event_loop_proxy,
        callback: Arc::new(Mutex::new(fn_mut)),
    }
}

pub fn run_event_loop_task<F: FnOnce()>(event_loop: &ActiveEventLoop, callback: F) {
    ACTIVE_EVENT_LOOP.set(event_loop as *const ActiveEventLoop);
    callback();
    ACTIVE_EVENT_LOOP.set(null_mut());
}

pub fn run_with_event_loop<R, F: FnOnce(&ActiveEventLoop) -> R>(callback: F) -> R {
    let el = ACTIVE_EVENT_LOOP.get();
    unsafe {
        if el == null_mut() {
            panic!("ActiveEventLoop not found");
        }
        callback(&*el)
    }
}

pub fn init_event_loop_proxy(elp: AppEventProxy) {
    STATIC_EVENT_LOOP_PROXY.with_borrow_mut(move |m| {
        m.replace(elp);
    })
}

pub fn create_event_loop_proxy() -> AppEventProxy {
    STATIC_EVENT_LOOP_PROXY.with_borrow(|p| {
        p.as_ref().expect("Failed to create event loop proxy").clone()
    })
}