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| 1 | +use std::{ |
| 2 | + self, collections::VecDeque, fmt::{self, Debug, Formatter}, |
| 3 | + hint::unreachable_unchecked, mem, sync::{Mutex, MutexGuard}, |
| 4 | +}; |
| 5 | + |
| 6 | +use cocoa::{appkit::NSApp, base::nil}; |
| 7 | + |
| 8 | +use { |
| 9 | + event::{Event, StartCause}, |
| 10 | + event_loop::{ControlFlow, EventLoopWindowTarget as RootWindowTarget}, |
| 11 | +}; |
| 12 | +use platform_impl::platform::{observer::EventLoopWaker, util::Never}; |
| 13 | + |
| 14 | +lazy_static! { |
| 15 | + static ref HANDLER: Mutex<Handler> = Default::default(); |
| 16 | + static ref EVENTS: Mutex<VecDeque<Event<Never>>> = Default::default(); |
| 17 | +} |
| 18 | + |
| 19 | +impl Event<Never> { |
| 20 | + fn userify<T: 'static>(self) -> Event<T> { |
| 21 | + self.map_nonuser_event() |
| 22 | + // `Never` can't be constructed, so the `UserEvent` variant can't |
| 23 | + // be present here. |
| 24 | + .unwrap_or_else(|_| unsafe { unreachable_unchecked() }) |
| 25 | + } |
| 26 | +} |
| 27 | + |
| 28 | +pub trait EventHandler: Debug { |
| 29 | + fn handle_nonuser_event(&mut self, event: Event<Never>, control_flow: *mut ControlFlow); |
| 30 | + //fn handle_user_events(&mut self, control_flow: &mut ControlFlow); |
| 31 | +} |
| 32 | + |
| 33 | +struct EventLoopHandler<F, T: 'static> { |
| 34 | + callback: F, |
| 35 | + window_target: RootWindowTarget<T>, |
| 36 | +} |
| 37 | + |
| 38 | +impl<F, T: 'static> Debug for EventLoopHandler<F, T> { |
| 39 | + fn fmt(&self, formatter: &mut Formatter) -> fmt::Result { |
| 40 | + formatter.debug_struct("EventLoopHandler") |
| 41 | + .field("window_target", &self.window_target) |
| 42 | + .finish() |
| 43 | + } |
| 44 | +} |
| 45 | + |
| 46 | +impl<F, T> EventHandler for EventLoopHandler<F, T> |
| 47 | +where |
| 48 | + F: 'static + FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow), |
| 49 | + T: 'static, |
| 50 | +{ |
| 51 | + fn handle_nonuser_event(&mut self, event: Event<Never>, control_flow: *mut ControlFlow) { |
| 52 | + (self.callback)( |
| 53 | + event.userify(), |
| 54 | + &self.window_target, |
| 55 | + unsafe { &mut *control_flow }, |
| 56 | + ); |
| 57 | + } |
| 58 | + |
| 59 | + /*fn handle_user_events(&mut self, control_flow: &mut ControlFlow) { |
| 60 | + for event in self.event_loop.inner.receiver.try_iter() { |
| 61 | + (self.callback)( |
| 62 | + Event::UserEvent(event), |
| 63 | + &self.event_loop, |
| 64 | + control_flow, |
| 65 | + ); |
| 66 | + } |
| 67 | + }*/ |
| 68 | +} |
| 69 | + |
| 70 | +#[derive(Default)] |
| 71 | +struct Handler { |
| 72 | + control_flow: ControlFlow, |
| 73 | + control_flow_prev: ControlFlow, |
| 74 | + callback: Option<Box<dyn EventHandler>>, |
| 75 | + waker: EventLoopWaker, |
| 76 | +} |
| 77 | + |
| 78 | +unsafe impl Send for Handler {} |
| 79 | +unsafe impl Sync for Handler {} |
| 80 | + |
| 81 | +impl Handler { |
| 82 | + fn handle_nonuser_event(&mut self, event: Event<Never>) { |
| 83 | + let control_flow = &mut self.control_flow; |
| 84 | + if let Some(ref mut callback) = self.callback { |
| 85 | + callback.handle_nonuser_event(event, control_flow); |
| 86 | + } |
| 87 | + } |
| 88 | +} |
| 89 | + |
| 90 | +pub enum AppState {} |
| 91 | + |
| 92 | +impl AppState { |
| 93 | + fn handler() -> MutexGuard<'static, Handler> { |
| 94 | + HANDLER.lock().unwrap() |
| 95 | + } |
| 96 | + |
| 97 | + fn events() -> MutexGuard<'static, VecDeque<Event<Never>>> { |
| 98 | + EVENTS.lock().unwrap() |
| 99 | + } |
| 100 | + |
| 101 | + pub fn set_callback<F, T>(callback: F, window_target: RootWindowTarget<T>) |
| 102 | + where |
| 103 | + F: 'static + FnMut(Event<T>, &RootWindowTarget<T>, &mut ControlFlow), |
| 104 | + T: 'static, |
| 105 | + { |
| 106 | + Self::handler().callback = Some(Box::new(EventLoopHandler { |
| 107 | + callback, |
| 108 | + window_target, |
| 109 | + })); |
| 110 | + } |
| 111 | + |
| 112 | + pub fn exit() -> ! { |
| 113 | + let mut handler = Self::handler(); |
| 114 | + if let Some(mut callback) = handler.callback.take() { |
| 115 | + callback.handle_nonuser_event( |
| 116 | + Event::LoopDestroyed, |
| 117 | + &mut handler.control_flow, |
| 118 | + ); |
| 119 | + } |
| 120 | + std::process::exit(0) |
| 121 | + } |
| 122 | + |
| 123 | + pub fn launched() { |
| 124 | + let mut handler = Self::handler(); |
| 125 | + handler.waker.start(); |
| 126 | + handler.handle_nonuser_event(Event::NewEvents(StartCause::Init)); |
| 127 | + } |
| 128 | + |
| 129 | + pub fn wakeup() { |
| 130 | + let mut handler = Self::handler(); |
| 131 | + handler.control_flow_prev = handler.control_flow; |
| 132 | + let cause = match handler.control_flow { |
| 133 | + ControlFlow::Poll => StartCause::Poll, |
| 134 | + /*ControlFlow::Wait => StartCause::WaitCancelled { |
| 135 | + start, |
| 136 | + requested_resume: None, |
| 137 | + }, |
| 138 | + ControlFlow::WaitUntil(requested_resume) => { |
| 139 | + if Instant::now() >= requested_resume { |
| 140 | + StartCause::ResumeTimeReached { |
| 141 | + start, |
| 142 | + requested_resume, |
| 143 | + } |
| 144 | + } else { |
| 145 | + StartCause::WaitCancelled { |
| 146 | + start, |
| 147 | + requested_resume: Some(requested_resume), |
| 148 | + } |
| 149 | + } |
| 150 | + },*/ |
| 151 | + ControlFlow::Exit => StartCause::Poll,//panic!("unexpected `ControlFlow::Exit`"), |
| 152 | + _ => unimplemented!(), |
| 153 | + }; |
| 154 | + handler.handle_nonuser_event(Event::NewEvents(cause)); |
| 155 | + } |
| 156 | + |
| 157 | + pub fn queue_event(event: Event<Never>) { |
| 158 | + Self::events().push_back(event); |
| 159 | + } |
| 160 | + |
| 161 | + pub fn queue_events(mut events: VecDeque<Event<Never>>) { |
| 162 | + Self::events().append(&mut events); |
| 163 | + } |
| 164 | + |
| 165 | + pub fn cleared() { |
| 166 | + let mut handler = Self::handler(); |
| 167 | + handler.handle_nonuser_event(Event::EventsCleared); |
| 168 | + let events = mem::replace(&mut *Self::events(), Default::default()); |
| 169 | + for event in events { |
| 170 | + handler.handle_nonuser_event(event); |
| 171 | + } |
| 172 | + let old = handler.control_flow_prev; |
| 173 | + let new = handler.control_flow; |
| 174 | + match (old, new) { |
| 175 | + (ControlFlow::Poll, ControlFlow::Poll) => (), |
| 176 | + (ControlFlow::Wait, ControlFlow::Wait) => (), |
| 177 | + (ControlFlow::WaitUntil(old_instant), ControlFlow::WaitUntil(new_instant)) if old_instant == new_instant => (), |
| 178 | + (_, ControlFlow::Wait) => handler.waker.stop(), |
| 179 | + (_, ControlFlow::WaitUntil(new_instant)) => handler.waker.start_at(new_instant), |
| 180 | + (_, ControlFlow::Poll) => handler.waker.start(), |
| 181 | + (_, ControlFlow::Exit) => { |
| 182 | + let _: () = unsafe { msg_send![NSApp(), stop:nil] }; |
| 183 | + }, |
| 184 | + } |
| 185 | + } |
| 186 | +} |
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