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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609
use std::cell::RefCell;
use std::collections::HashMap;
use std::error::Error;
use std::io::Result as IOResult;
use std::mem;
use std::process;
use std::rc::Rc;
use std::time::{Duration, Instant};
use raw_window_handle::{RawDisplayHandle, WaylandDisplayHandle};
use sctk::reexports::client::protocol::wl_compositor::WlCompositor;
use sctk::reexports::client::protocol::wl_shm::WlShm;
use sctk::reexports::client::Display;
use sctk::reexports::calloop;
use sctk::environment::Environment;
use sctk::seat::pointer::{ThemeManager, ThemeSpec};
use sctk::WaylandSource;
use crate::dpi::{LogicalSize, PhysicalSize};
use crate::event::{Event, StartCause, WindowEvent};
use crate::event_loop::{ControlFlow, EventLoopWindowTarget as RootEventLoopWindowTarget};
use crate::platform_impl::platform::sticky_exit_callback;
use crate::platform_impl::EventLoopWindowTarget as PlatformEventLoopWindowTarget;
use super::env::{WindowingFeatures, WinitEnv};
use super::output::OutputManager;
use super::seat::SeatManager;
use super::window::shim::{self, WindowCompositorUpdate, WindowUserRequest};
use super::{DeviceId, WindowId};
mod proxy;
mod sink;
mod state;
pub use proxy::EventLoopProxy;
pub use sink::EventSink;
pub use state::WinitState;
type WinitDispatcher = calloop::Dispatcher<'static, WaylandSource, WinitState>;
pub struct EventLoopWindowTarget<T> {
/// Wayland display.
pub display: Display,
/// Environment to handle object creation, etc.
pub env: Environment<WinitEnv>,
/// Event loop handle.
pub event_loop_handle: calloop::LoopHandle<'static, WinitState>,
/// Output manager.
pub output_manager: OutputManager,
/// State that we share across callbacks.
pub state: RefCell<WinitState>,
/// Dispatcher of Wayland events.
pub wayland_dispatcher: WinitDispatcher,
/// A proxy to wake up event loop.
pub event_loop_awakener: calloop::ping::Ping,
/// The available windowing features.
pub windowing_features: WindowingFeatures,
/// Theme manager to manage cursors.
///
/// It's being shared between all windows to avoid loading
/// multiple similar themes.
pub theme_manager: ThemeManager,
_marker: std::marker::PhantomData<T>,
}
impl<T> EventLoopWindowTarget<T> {
pub fn raw_display_handle(&self) -> RawDisplayHandle {
let mut display_handle = WaylandDisplayHandle::empty();
display_handle.display = self.display.get_display_ptr() as *mut _;
RawDisplayHandle::Wayland(display_handle)
}
}
pub struct EventLoop<T: 'static> {
/// Dispatcher of Wayland events.
pub wayland_dispatcher: WinitDispatcher,
/// Event loop.
event_loop: calloop::EventLoop<'static, WinitState>,
/// Wayland display.
display: Display,
/// Pending user events.
pending_user_events: Rc<RefCell<Vec<T>>>,
/// Sender of user events.
user_events_sender: calloop::channel::Sender<T>,
/// Window target.
window_target: RootEventLoopWindowTarget<T>,
/// Output manager.
_seat_manager: SeatManager,
}
impl<T: 'static> EventLoop<T> {
pub fn new() -> Result<EventLoop<T>, Box<dyn Error>> {
// Connect to wayland server and setup event queue.
let display = Display::connect_to_env()?;
let mut event_queue = display.create_event_queue();
let display_proxy = display.attach(event_queue.token());
// Setup environment.
let env = Environment::new(&display_proxy, &mut event_queue, WinitEnv::new())?;
// Create event loop.
let event_loop = calloop::EventLoop::<'static, WinitState>::try_new()?;
// Build windowing features.
let windowing_features = WindowingFeatures::new(&env);
// Create a theme manager.
let compositor = env.require_global::<WlCompositor>();
let shm = env.require_global::<WlShm>();
let theme_manager = ThemeManager::init(ThemeSpec::System, compositor, shm);
// Setup theme seat and output managers.
let seat_manager = SeatManager::new(&env, event_loop.handle(), theme_manager.clone());
let output_manager = OutputManager::new(&env);
// A source of events that we plug into our event loop.
let wayland_source = WaylandSource::new(event_queue);
let wayland_dispatcher =
calloop::Dispatcher::new(wayland_source, |_, queue, winit_state| {
queue.dispatch_pending(winit_state, |event, object, _| {
panic!(
"[calloop] Encountered an orphan event: {}@{} : {}",
event.interface,
object.as_ref().id(),
event.name
);
})
});
let _wayland_source_dispatcher = event_loop
.handle()
.register_dispatcher(wayland_dispatcher.clone())?;
// A source of user events.
let pending_user_events = Rc::new(RefCell::new(Vec::new()));
let pending_user_events_clone = pending_user_events.clone();
let (user_events_sender, user_events_channel) = calloop::channel::channel();
// User events channel.
event_loop
.handle()
.insert_source(user_events_channel, move |event, _, _| {
if let calloop::channel::Event::Msg(msg) = event {
pending_user_events_clone.borrow_mut().push(msg);
}
})?;
// An event's loop awakener to wake up for window events from winit's windows.
let (event_loop_awakener, event_loop_awakener_source) = calloop::ping::make_ping()?;
// Handler of window requests.
event_loop
.handle()
.insert_source(event_loop_awakener_source, move |_, _, state| {
// Drain events here as well to account for application doing batch event processing
// on RedrawEventsCleared.
shim::handle_window_requests(state);
})?;
let event_loop_handle = event_loop.handle();
let window_map = HashMap::new();
let event_sink = EventSink::new();
let window_user_requests = HashMap::new();
let window_compositor_updates = HashMap::new();
// Create event loop window target.
let event_loop_window_target = EventLoopWindowTarget {
display: display.clone(),
env,
state: RefCell::new(WinitState {
window_map,
event_sink,
window_user_requests,
window_compositor_updates,
}),
event_loop_handle,
output_manager,
event_loop_awakener,
wayland_dispatcher: wayland_dispatcher.clone(),
windowing_features,
theme_manager,
_marker: std::marker::PhantomData,
};
// Create event loop itself.
let event_loop = Self {
event_loop,
display,
pending_user_events,
wayland_dispatcher,
_seat_manager: seat_manager,
user_events_sender,
window_target: RootEventLoopWindowTarget {
p: PlatformEventLoopWindowTarget::Wayland(event_loop_window_target),
_marker: std::marker::PhantomData,
},
};
Ok(event_loop)
}
pub fn run<F>(mut self, callback: F) -> !
where
F: FnMut(Event<'_, T>, &RootEventLoopWindowTarget<T>, &mut ControlFlow) + 'static,
{
let exit_code = self.run_return(callback);
process::exit(exit_code);
}
pub fn run_return<F>(&mut self, mut callback: F) -> i32
where
F: FnMut(Event<'_, T>, &RootEventLoopWindowTarget<T>, &mut ControlFlow),
{
let mut control_flow = ControlFlow::Poll;
let pending_user_events = self.pending_user_events.clone();
callback(
Event::NewEvents(StartCause::Init),
&self.window_target,
&mut control_flow,
);
// NB: For consistency all platforms must emit a 'resumed' event even though Wayland
// applications don't themselves have a formal suspend/resume lifecycle.
callback(Event::Resumed, &self.window_target, &mut control_flow);
let mut window_compositor_updates: Vec<(WindowId, WindowCompositorUpdate)> = Vec::new();
let mut window_user_requests: Vec<(WindowId, WindowUserRequest)> = Vec::new();
let mut event_sink_back_buffer = Vec::new();
// NOTE We break on errors from dispatches, since if we've got protocol error
// libwayland-client/wayland-rs will inform us anyway, but crashing downstream is not
// really an option. Instead we inform that the event loop got destroyed. We may
// communicate an error that something was terminated, but winit doesn't provide us
// with an API to do that via some event.
// Still, we set the exit code to the error's OS error code, or to 1 if not possible.
let exit_code = loop {
// Send pending events to the server.
let _ = self.display.flush();
// During the run of the user callback, some other code monitoring and reading the
// Wayland socket may have been run (mesa for example does this with vsync), if that
// is the case, some events may have been enqueued in our event queue.
//
// If some messages are there, the event loop needs to behave as if it was instantly
// woken up by messages arriving from the Wayland socket, to avoid delaying the
// dispatch of these events until we're woken up again.
let instant_wakeup = {
let mut wayland_source = self.wayland_dispatcher.as_source_mut();
let queue = wayland_source.queue();
let state = match &mut self.window_target.p {
PlatformEventLoopWindowTarget::Wayland(window_target) => {
window_target.state.get_mut()
}
#[cfg(x11_platform)]
_ => unreachable!(),
};
match queue.dispatch_pending(state, |_, _, _| unimplemented!()) {
Ok(dispatched) => dispatched > 0,
Err(error) => break error.raw_os_error().unwrap_or(1),
}
};
match control_flow {
ControlFlow::ExitWithCode(code) => break code,
ControlFlow::Poll => {
// Non-blocking dispatch.
let timeout = Duration::from_millis(0);
if let Err(error) = self.loop_dispatch(Some(timeout)) {
break error.raw_os_error().unwrap_or(1);
}
callback(
Event::NewEvents(StartCause::Poll),
&self.window_target,
&mut control_flow,
);
}
ControlFlow::Wait => {
let timeout = if instant_wakeup {
Some(Duration::from_millis(0))
} else {
None
};
if let Err(error) = self.loop_dispatch(timeout) {
break error.raw_os_error().unwrap_or(1);
}
callback(
Event::NewEvents(StartCause::WaitCancelled {
start: Instant::now(),
requested_resume: None,
}),
&self.window_target,
&mut control_flow,
);
}
ControlFlow::WaitUntil(deadline) => {
let start = Instant::now();
// Compute the amount of time we'll block for.
let duration = if deadline > start && !instant_wakeup {
deadline - start
} else {
Duration::from_millis(0)
};
if let Err(error) = self.loop_dispatch(Some(duration)) {
break error.raw_os_error().unwrap_or(1);
}
let now = Instant::now();
if now < deadline {
callback(
Event::NewEvents(StartCause::WaitCancelled {
start,
requested_resume: Some(deadline),
}),
&self.window_target,
&mut control_flow,
)
} else {
callback(
Event::NewEvents(StartCause::ResumeTimeReached {
start,
requested_resume: deadline,
}),
&self.window_target,
&mut control_flow,
)
}
}
}
// Handle pending user events. We don't need back buffer, since we can't dispatch
// user events indirectly via callback to the user.
for user_event in pending_user_events.borrow_mut().drain(..) {
sticky_exit_callback(
Event::UserEvent(user_event),
&self.window_target,
&mut control_flow,
&mut callback,
);
}
// Process 'new' pending updates from compositor.
self.with_state(|state| {
window_compositor_updates.clear();
window_compositor_updates.extend(
state
.window_compositor_updates
.iter_mut()
.map(|(wid, window_update)| (*wid, mem::take(window_update))),
);
});
for (window_id, window_compositor_update) in window_compositor_updates.iter_mut() {
if let Some(scale_factor) = window_compositor_update.scale_factor {
let mut physical_size = self.with_state(|state| {
let window_handle = state.window_map.get(window_id).unwrap();
*window_handle.scale_factor.lock().unwrap() = scale_factor;
let mut size = window_handle.size.lock().unwrap();
// Update the new logical size if it was changed.
let window_size = window_compositor_update.size.unwrap_or(*size);
*size = window_size;
logical_to_physical_rounded(window_size, scale_factor)
});
sticky_exit_callback(
Event::WindowEvent {
window_id: crate::window::WindowId(*window_id),
event: WindowEvent::ScaleFactorChanged {
scale_factor,
new_inner_size: &mut physical_size,
},
},
&self.window_target,
&mut control_flow,
&mut callback,
);
// We don't update size on a window handle since we'll do that later
// when handling size update.
let new_logical_size = physical_size.to_logical(scale_factor);
window_compositor_update.size = Some(new_logical_size);
}
if let Some(size) = window_compositor_update.size.take() {
let physical_size = self.with_state(|state| {
let window_handle = state.window_map.get_mut(window_id).unwrap();
if let Some(fs_state) = window_handle.fractional_scaling_state.as_ref() {
// If we have a viewport then we support fractional scaling. As per the
// protocol, we have to set the viewport size of the size prior scaling.
fs_state
.viewport
.set_destination(size.width as _, size.height as _);
}
let mut window_size = window_handle.size.lock().unwrap();
// Always issue resize event on scale factor change.
let physical_size = if window_compositor_update.scale_factor.is_none()
&& *window_size == size
{
// The size hasn't changed, don't inform downstream about that.
None
} else {
*window_size = size;
let scale_factor = window_handle.scale_factor();
let physical_size = logical_to_physical_rounded(size, scale_factor);
Some(physical_size)
};
// We still perform all of those resize related logic even if the size
// hasn't changed, since GNOME relies on `set_geometry` calls after
// configures.
window_handle.window.resize(size.width, size.height);
window_handle.window.refresh();
// Update the opaque region.
window_handle.set_transparent(window_handle.transparent.get());
// Mark that refresh isn't required, since we've done it right now.
state
.window_user_requests
.get_mut(window_id)
.unwrap()
.refresh_frame = false;
// Queue redraw requested.
state
.window_user_requests
.get_mut(window_id)
.unwrap()
.redraw_requested = true;
physical_size
});
if let Some(physical_size) = physical_size {
sticky_exit_callback(
Event::WindowEvent {
window_id: crate::window::WindowId(*window_id),
event: WindowEvent::Resized(physical_size),
},
&self.window_target,
&mut control_flow,
&mut callback,
);
}
}
// If the close is requested, send it here.
if window_compositor_update.close_window {
sticky_exit_callback(
Event::WindowEvent {
window_id: crate::window::WindowId(*window_id),
event: WindowEvent::CloseRequested,
},
&self.window_target,
&mut control_flow,
&mut callback,
);
}
}
// The purpose of the back buffer and that swap is to not hold borrow_mut when
// we're doing callback to the user, since we can double borrow if the user decides
// to create a window in one of those callbacks.
self.with_state(|state| {
std::mem::swap(
&mut event_sink_back_buffer,
&mut state.event_sink.window_events,
)
});
// Handle pending window events.
for event in event_sink_back_buffer.drain(..) {
let event = event.map_nonuser_event().unwrap();
sticky_exit_callback(event, &self.window_target, &mut control_flow, &mut callback);
}
// Send events cleared.
sticky_exit_callback(
Event::MainEventsCleared,
&self.window_target,
&mut control_flow,
&mut callback,
);
// Apply user requests, so every event required resize and latter surface commit will
// be applied right before drawing. This will also ensure that every `RedrawRequested`
// event will be delivered in time.
self.with_state(|state| {
shim::handle_window_requests(state);
});
// Process 'new' pending updates from compositor.
self.with_state(|state| {
window_user_requests.clear();
window_user_requests.extend(
state
.window_user_requests
.iter_mut()
.map(|(wid, window_request)| (*wid, mem::take(window_request))),
);
});
// Handle RedrawRequested events.
for (window_id, mut window_request) in window_user_requests.iter() {
// Handle refresh of the frame.
if window_request.refresh_frame {
self.with_state(|state| {
let window_handle = state.window_map.get_mut(window_id).unwrap();
window_handle.window.refresh();
});
// In general refreshing the frame requires surface commit, those force user
// to redraw.
window_request.redraw_requested = true;
}
// Handle redraw request.
if window_request.redraw_requested {
sticky_exit_callback(
Event::RedrawRequested(crate::window::WindowId(*window_id)),
&self.window_target,
&mut control_flow,
&mut callback,
);
}
}
// Send RedrawEventCleared.
sticky_exit_callback(
Event::RedrawEventsCleared,
&self.window_target,
&mut control_flow,
&mut callback,
);
};
callback(Event::LoopDestroyed, &self.window_target, &mut control_flow);
exit_code
}
#[inline]
pub fn create_proxy(&self) -> EventLoopProxy<T> {
EventLoopProxy::new(self.user_events_sender.clone())
}
#[inline]
pub fn window_target(&self) -> &RootEventLoopWindowTarget<T> {
&self.window_target
}
fn with_state<U, F: FnOnce(&mut WinitState) -> U>(&mut self, f: F) -> U {
let state = match &mut self.window_target.p {
PlatformEventLoopWindowTarget::Wayland(window_target) => window_target.state.get_mut(),
#[cfg(x11_platform)]
_ => unreachable!(),
};
f(state)
}
fn loop_dispatch<D: Into<Option<std::time::Duration>>>(&mut self, timeout: D) -> IOResult<()> {
let state = match &mut self.window_target.p {
PlatformEventLoopWindowTarget::Wayland(window_target) => window_target.state.get_mut(),
#[cfg(x11_platform)]
_ => unreachable!(),
};
self.event_loop
.dispatch(timeout, state)
.map_err(|error| error.into())
}
}
// The default routine does floor, but we need round on Wayland.
fn logical_to_physical_rounded(size: LogicalSize<u32>, scale_factor: f64) -> PhysicalSize<u32> {
let width = size.width as f64 * scale_factor;
let height = size.height as f64 * scale_factor;
(width.round(), height.round()).into()
}