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pub enum Event {
FrameTransition((usize, vt100::Screen)),
Key(textmode::Key),
FrameLoaded(Option<usize>),
Paused(bool),
TimerAction(TimerAction),
ToggleUi,
Quit,
}
pub enum TimerAction {
Pause,
FirstFrame,
LastFrame,
NextFrame,
PreviousFrame,
Quit,
}
pub struct Reader {
pending: async_std::sync::Mutex<Pending>,
cvar: async_std::sync::Condvar,
}
impl Reader {
pub fn new(
input: async_std::channel::Receiver<Event>,
) -> async_std::sync::Arc<Self> {
let this = Self {
pending: async_std::sync::Mutex::new(Pending::new()),
cvar: async_std::sync::Condvar::new(),
};
let this = async_std::sync::Arc::new(this);
{
let this = this.clone();
async_std::task::spawn(async move {
while let Ok(event) = input.recv().await {
this.event(event).await;
}
this.event(Event::Quit).await;
});
}
this
}
pub async fn read(&self) -> Option<Event> {
let mut pending = self
.cvar
.wait_until(self.pending.lock().await, |pending| {
pending.has_event()
})
.await;
pending.get_event()
}
async fn event(&self, event: Event) {
let mut pending = self.pending.lock().await;
pending.event(event);
self.cvar.notify_one();
}
}
#[derive(Default)]
struct Pending {
render: Option<(usize, vt100::Screen)>,
key: std::collections::VecDeque<textmode::Key>,
frame_loaded: Option<usize>,
done_loading: bool,
paused: Option<bool>,
timer_actions: std::collections::VecDeque<TimerAction>,
toggle_ui: bool,
quit: bool,
}
impl Pending {
fn new() -> Self {
Self::default()
}
fn event(&mut self, event: Event) {
match event {
Event::FrameTransition((idx, screen)) => {
self.render = Some((idx, screen));
}
Event::Key(key) => {
self.key.push_back(key);
}
Event::FrameLoaded(idx) => {
if let Some(idx) = idx {
self.frame_loaded = Some(idx);
} else {
self.done_loading = true;
}
}
Event::Paused(paused) => {
self.paused = Some(paused);
}
Event::TimerAction(action) => {
self.timer_actions.push_back(action);
}
Event::ToggleUi => {
self.toggle_ui = !self.toggle_ui;
}
Event::Quit => {
self.quit = true;
}
}
}
fn has_event(&self) -> bool {
self.render.is_some()
|| !self.key.is_empty()
|| self.frame_loaded.is_some()
|| self.done_loading
|| self.paused.is_some()
|| !self.timer_actions.is_empty()
|| self.toggle_ui
|| self.quit
}
fn get_event(&mut self) -> Option<Event> {
if self.quit {
self.quit = false;
Some(Event::Quit)
} else if let Some(key) = self.key.pop_front() {
Some(Event::Key(key))
} else if let Some(action) = self.timer_actions.pop_front() {
Some(Event::TimerAction(action))
} else if self.toggle_ui {
self.toggle_ui = false;
Some(Event::ToggleUi)
} else if let Some(paused) = self.paused.take() {
Some(Event::Paused(paused))
} else if let Some(frame) = self.frame_loaded.take() {
Some(Event::FrameLoaded(Some(frame)))
} else if self.done_loading {
self.done_loading = false;
Some(Event::FrameLoaded(None))
} else if let Some((idx, screen)) = self.render.take() {
Some(Event::FrameTransition((idx, screen)))
} else {
None
}
}
}
|
