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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License in the LICENSE-APACHE file or at:
// https://www.apache.org/licenses/LICENSE-2.0
//! Event loop and handling
use std::collections::HashMap;
use std::time::{Duration, Instant};
use winit::event::{Event, StartCause};
use winit::event_loop::{ControlFlow, EventLoopWindowTarget};
use winit::window as ww;
use super::{PendingAction, SharedState};
use super::{ProxyAction, Window, WindowSurface};
use kas::theme::Theme;
use kas::{Action, AppData, WindowId};
/// Event-loop data structure (i.e. all run-time state)
pub(super) struct Loop<A: AppData, S: WindowSurface, T: Theme<S::Shared>>
where
T::Window: kas::theme::Window,
{
/// State is suspended until we receive Event::Resumed
suspended: bool,
/// Window states
windows: HashMap<WindowId, Window<A, S, T>>,
popups: HashMap<WindowId, WindowId>,
/// Translates our WindowId to winit's
id_map: HashMap<ww::WindowId, WindowId>,
/// Shared data passed from Toolkit
shared: SharedState<A, S, T>,
/// Timer resumes: (time, window identifier)
resumes: Vec<(Instant, WindowId)>,
/// Frame rate counter
frame_count: (Instant, u32),
}
impl<A: AppData, S: WindowSurface, T: Theme<S::Shared>> Loop<A, S, T>
where
T::Window: kas::theme::Window,
{
pub(super) fn new(mut windows: Vec<Window<A, S, T>>, shared: SharedState<A, S, T>) -> Self {
Loop {
suspended: true,
windows: windows.drain(..).map(|w| (w.window_id, w)).collect(),
popups: Default::default(),
id_map: Default::default(),
shared,
resumes: vec![],
frame_count: (Instant::now(), 0),
}
}
pub(super) fn handle(
&mut self,
event: Event<ProxyAction>,
elwt: &EventLoopWindowTarget<ProxyAction>,
control_flow: &mut ControlFlow,
) {
match event {
Event::NewEvents(cause) => {
// MainEventsCleared will reset control_flow (but not when it is Poll)
*control_flow = ControlFlow::Wait;
match cause {
StartCause::ResumeTimeReached {
requested_resume, ..
} => {
let item = self
.resumes
.first()
.cloned()
.unwrap_or_else(|| panic!("timer wakeup without resume"));
assert_eq!(item.0, requested_resume);
log::trace!("Wakeup: timer (window={:?})", item.1);
let resume = if let Some(w) = self.windows.get_mut(&item.1) {
w.update_timer(&mut self.shared)
} else {
// presumably, some window with active timers was removed
None
};
if let Some(instant) = resume {
self.resumes[0].0 = instant;
} else {
self.resumes.remove(0);
}
}
StartCause::WaitCancelled { .. } => {
// This event serves no purpose?
// log::debug!("Wakeup: WaitCancelled (ignoring)");
}
StartCause::Poll => (),
StartCause::Init => (),
}
}
Event::WindowEvent { window_id, event } => {
self.flush_pending(elwt, control_flow);
if let Some(id) = self.id_map.get(&window_id) {
if let Some(window) = self.windows.get_mut(id) {
window.handle_event(&mut self.shared, event);
}
}
}
Event::DeviceEvent { .. } => {
// windows handle local input; we do not handle global input
}
Event::UserEvent(action) => match action {
ProxyAction::Close(id) => {
if let Some(window) = self.windows.get_mut(&id) {
window.send_action(Action::CLOSE);
}
}
ProxyAction::CloseAll => {
for window in self.windows.values_mut() {
window.send_action(Action::CLOSE);
}
}
ProxyAction::Message(msg) => {
let mut stack = crate::ErasedStack::new();
stack.push_erased(msg.into_erased());
self.shared.handle_messages(&mut stack);
}
ProxyAction::WakeAsync => {
// We don't need to do anything: MainEventsCleared will
// automatically be called after, which automatically calls
// window.update(..), which calls EventState::Update.
}
},
Event::Suspended if !self.suspended => {
for window in self.windows.values_mut() {
window.suspend();
}
self.suspended = true;
}
Event::Suspended => (),
Event::Resumed if self.suspended => {
for window in self.windows.values_mut() {
match window.resume(&mut self.shared, elwt) {
Ok(winit_id) => {
self.id_map.insert(winit_id, window.window_id);
}
Err(e) => {
log::error!("Unable to create window: {}", e);
}
}
}
self.suspended = false;
}
Event::Resumed => (),
Event::AboutToWait => {
self.flush_pending(elwt, control_flow);
self.resumes.sort_by_key(|item| item.0);
let is_exit = matches!(control_flow, ControlFlow::ExitWithCode(_));
*control_flow = if is_exit || self.windows.is_empty() {
self.shared.on_exit();
debug_assert!(!is_exit || matches!(control_flow, ControlFlow::ExitWithCode(0)));
ControlFlow::ExitWithCode(0)
} else if *control_flow == ControlFlow::Poll {
ControlFlow::Poll
} else if let Some((instant, _)) = self.resumes.first() {
ControlFlow::WaitUntil(*instant)
} else {
ControlFlow::Wait
};
}
Event::RedrawRequested(id) => {
// We must conclude pending actions (such as resize) before drawing.
self.flush_pending(elwt, control_flow);
if let Some(id) = self.id_map.get(&id) {
if let Some(window) = self.windows.get_mut(id) {
if window.do_draw(&mut self.shared).is_err() {
*control_flow = ControlFlow::Poll;
}
}
}
const SECOND: Duration = Duration::from_secs(1);
self.frame_count.1 += 1;
let now = Instant::now();
if self.frame_count.0 + SECOND <= now {
log::debug!("Frame rate: {} per second", self.frame_count.1);
self.frame_count.0 = now;
self.frame_count.1 = 0;
}
}
Event::LoopExiting => (),
}
}
fn flush_pending(
&mut self,
elwt: &EventLoopWindowTarget<ProxyAction>,
control_flow: &mut ControlFlow,
) {
while let Some(pending) = self.shared.shell.pending.pop() {
match pending {
PendingAction::AddPopup(parent_id, id, popup) => {
log::debug!("Pending: adding overlay");
// TODO: support pop-ups as a special window, where available
self.windows.get_mut(&parent_id).unwrap().add_popup(
&mut self.shared,
id,
popup,
);
self.popups.insert(id, parent_id);
}
PendingAction::AddWindow(id, widget) => {
log::debug!("Pending: adding window {}", widget.title());
let mut window = Window::new(&self.shared, id, widget);
if !self.suspended {
match window.resume(&mut self.shared, elwt) {
Ok(winit_id) => {
self.id_map.insert(winit_id, id);
}
Err(e) => {
log::error!("Unable to create window: {}", e);
}
}
}
self.windows.insert(id, window);
}
PendingAction::CloseWindow(target) => {
let mut win_id = target;
if let Some(id) = self.popups.remove(&target) {
win_id = id;
}
if let Some(window) = self.windows.get_mut(&win_id) {
window.send_close(&mut self.shared, target);
}
}
PendingAction::Action(action) => {
if action.contains(Action::CLOSE | Action::EXIT) {
self.windows.clear();
self.id_map.clear();
*control_flow = ControlFlow::Poll;
} else {
for (_, window) in self.windows.iter_mut() {
window.handle_action(&mut self.shared, action);
}
}
}
}
}
let mut close_all = false;
self.resumes.clear();
self.windows.retain(|window_id, window| {
let (action, resume) = window.flush_pending(&mut self.shared);
if let Some(instant) = resume {
self.resumes.push((instant, *window_id));
}
if action.contains(Action::EXIT) {
close_all = true;
true
} else if action.contains(Action::CLOSE) {
self.id_map.retain(|_, v| v != window_id);
false
} else {
true
}
});
if close_all {
for (_, mut window) in self.windows.drain() {
window.suspend();
}
self.id_map.clear();
}
}
}