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Implement ResizeObserver (#2859)

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Co-authored-by: Liam Murphy <43807659+Liamolucko@users.noreply.github.com>
This commit is contained in:
daxpedda 2023-06-14 09:43:53 +02:00 • committed by GitHub
parent 7ce86c3d2a
commit 9a9c9b15ba
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GPG key ID: 4AEE18F83AFDEB23
12 changed files with 584 additions and 364 deletions
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184
src/platform_impl/web/event_loop/runner.rs
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@ -1,4 +1,5 @@
use super::{super::ScaleChangeArgs, backend, state::State};
use super::{backend, state::State};
use crate::dpi::PhysicalSize;
use crate::event::{Event, StartCause};
use crate::event_loop::ControlFlow;
use crate::window::WindowId;
@ -25,13 +26,12 @@ impl<T> Clone for Shared<T> {
pub struct Execution<T: 'static> {
runner: RefCell<RunnerEnum<T>>,
events: RefCell<VecDeque<Event<'static, T>>>,
events: RefCell<VecDeque<EventWrapper<T>>>,
id: RefCell<u32>,
window: web_sys::Window,
all_canvases: RefCell<Vec<(WindowId, Weak<RefCell<backend::Canvas>>)>>,
redraw_pending: RefCell<HashSet<WindowId>>,
destroy_pending: RefCell<VecDeque<WindowId>>,
scale_change_detector: RefCell<Option<backend::ScaleChangeDetector>>,
unload_event_handle: RefCell<Option<backend::UnloadEventHandle>>,
}
@ -86,10 +86,31 @@ impl<T: 'static> Runner<T> {
})
}
fn handle_single_event(&mut self, event: Event<'_, T>, control: &mut ControlFlow) {
fn handle_single_event(
&mut self,
runner: &Shared<T>,
event: impl Into<EventWrapper<T>>,
control: &mut ControlFlow,
) {
let is_closed = matches!(*control, ControlFlow::ExitWithCode(_));
(self.event_handler)(event, control);
match event.into() {
EventWrapper::Event(event) => (self.event_handler)(event, control),
EventWrapper::ScaleChange {
canvas,
size,
scale,
} => {
if let Some(canvas) = canvas.upgrade() {
canvas.borrow().handle_scale_change(
runner,
|event| (self.event_handler)(event, control),
size,
scale,
)
}
}
}
// Maintain closed state, even if the callback changes it
if is_closed {
@ -109,7 +130,6 @@ impl<T: 'static> Shared<T> {
all_canvases: RefCell::new(Vec::new()),
redraw_pending: RefCell::new(HashSet::new()),
destroy_pending: RefCell::new(VecDeque::new()),
scale_change_detector: RefCell::new(None),
unload_event_handle: RefCell::new(None),
}))
}
@ -147,16 +167,6 @@ impl<T: 'static> Shared<T> {
}));
}
pub(crate) fn set_on_scale_change<F>(&self, handler: F)
where
F: 'static + FnMut(ScaleChangeArgs),
{
*self.0.scale_change_detector.borrow_mut() = Some(backend::ScaleChangeDetector::new(
self.window().clone(),
handler,
));
}
// Generate a strictly increasing ID
// This is used to differentiate windows when handling events
pub fn generate_id(&self) -> u32 {
@ -168,7 +178,7 @@ impl<T: 'static> Shared<T> {
pub fn request_redraw(&self, id: WindowId) {
self.0.redraw_pending.borrow_mut().insert(id);
self.send_events(iter::empty());
self.send_events::<EventWrapper<T>>(iter::empty());
}
pub fn init(&self) {
@ -196,14 +206,17 @@ impl<T: 'static> Shared<T> {
// Add an event to the event loop runner, from the user or an event handler
//
// It will determine if the event should be immediately sent to the user or buffered for later
pub fn send_event(&self, event: Event<'static, T>) {
pub(crate) fn send_event<E: Into<EventWrapper<T>>>(&self, event: E) {
self.send_events(iter::once(event));
}
// Add a series of events to the event loop runner
//
// It will determine if the event should be immediately sent to the user or buffered for later
pub fn send_events(&self, events: impl IntoIterator<Item = Event<'static, T>>) {
pub(crate) fn send_events<E: Into<EventWrapper<T>>>(
&self,
events: impl IntoIterator<Item = E>,
) {
// If the event loop is closed, it should discard any new events
if self.is_closed() {
return;
@ -232,7 +245,10 @@ impl<T: 'static> Shared<T> {
}
if !process_immediately {
// Queue these events to look at later
self.0.events.borrow_mut().extend(events);
self.0
.events
.borrow_mut()
.extend(events.into_iter().map(Into::into));
return;
}
// At this point, we know this is a fresh set of events
@ -250,13 +266,13 @@ impl<T: 'static> Shared<T> {
// Take the start event, then the events provided to this function, and run an iteration of
// the event loop
let start_event = Event::NewEvents(start_cause);
let events = iter::once(start_event).chain(events);
let events =
iter::once(EventWrapper::from(start_event)).chain(events.into_iter().map(Into::into));
self.run_until_cleared(events);
}
// Process the destroy-pending windows. This should only be called from
// `run_until_cleared` and `handle_scale_changed`, somewhere between emitting
// `NewEvents` and `MainEventsCleared`.
// `run_until_cleared`, somewhere between emitting `NewEvents` and `MainEventsCleared`.
fn process_destroy_pending_windows(&self, control: &mut ControlFlow) {
while let Some(id) = self.0.destroy_pending.borrow_mut().pop_front() {
self.0
@ -278,10 +294,10 @@ impl<T: 'static> Shared<T> {
// cleared
//
// This will also process any events that have been queued or that are queued during processing
fn run_until_cleared(&self, events: impl Iterator<Item = Event<'static, T>>) {
fn run_until_cleared<E: Into<EventWrapper<T>>>(&self, events: impl Iterator<Item = E>) {
let mut control = self.current_control_flow();
for event in events {
self.handle_event(event, &mut control);
self.handle_event(event.into(), &mut control);
}
self.process_destroy_pending_windows(&mut control);
self.handle_event(Event::MainEventsCleared, &mut control);
@ -301,85 +317,6 @@ impl<T: 'static> Shared<T> {
}
}
pub fn handle_scale_changed(&self, old_scale: f64, new_scale: f64) {
// If there aren't any windows, then there is nothing to do here.
if self.0.all_canvases.borrow().is_empty() {
return;
}
let start_cause = match (self.0.runner.borrow().maybe_runner())
.unwrap_or_else(|| unreachable!("`scale_changed` should not happen without a runner"))
.maybe_start_cause()
{
Some(c) => c,
// If we're in the exit state, don't do event processing
None => return,
};
let mut control = self.current_control_flow();
// Handle the start event and all other events in the queue.
self.handle_event(Event::NewEvents(start_cause), &mut control);
// It is possible for windows to be dropped before this point. We don't
// want to send `ScaleFactorChanged` for destroyed windows, so we process
// the destroy-pending windows here.
self.process_destroy_pending_windows(&mut control);
// Now handle the `ScaleFactorChanged` events.
for &(id, ref canvas) in &*self.0.all_canvases.borrow() {
let rc = match canvas.upgrade() {
Some(rc) => rc,
// This shouldn't happen, but just in case...
None => continue,
};
let canvas = rc.borrow();
// First, we send the `ScaleFactorChanged` event:
let current_size = canvas.size().get();
let logical_size = current_size.to_logical::<f64>(old_scale);
let mut new_size = logical_size.to_physical(new_scale);
self.handle_single_event_sync(
Event::WindowEvent {
window_id: id,
event: crate::event::WindowEvent::ScaleFactorChanged {
scale_factor: new_scale,
new_inner_size: &mut new_size,
},
},
&mut control,
);
// Then we resize the canvas to the new size and send a `Resized` event:
if current_size != new_size {
backend::set_canvas_size(&canvas, crate::dpi::Size::Physical(new_size));
self.handle_single_event_sync(
Event::WindowEvent {
window_id: id,
event: crate::event::WindowEvent::Resized(new_size),
},
&mut control,
);
}
}
// Process the destroy-pending windows again.
self.process_destroy_pending_windows(&mut control);
self.handle_event(Event::MainEventsCleared, &mut control);
// Discard all the pending redraw as we shall just redraw all windows.
self.0.redraw_pending.borrow_mut().clear();
for &(window_id, _) in &*self.0.all_canvases.borrow() {
self.handle_event(Event::RedrawRequested(window_id), &mut control);
}
self.handle_event(Event::RedrawEventsCleared, &mut control);
self.apply_control_flow(control);
// If the event loop is closed, it has been closed this iteration and now the closing
// event should be emitted
if self.is_closed() {
self.handle_loop_destroyed(&mut control);
}
}
fn handle_unload(&self) {
self.apply_control_flow(ControlFlow::Exit);
let mut control = self.current_control_flow();
@ -388,35 +325,20 @@ impl<T: 'static> Shared<T> {
self.handle_event(Event::LoopDestroyed, &mut control);
}
// handle_single_event_sync takes in an event and handles it synchronously.
//
// It should only ever be called from `scale_changed`.
fn handle_single_event_sync(&self, event: Event<'_, T>, control: &mut ControlFlow) {
if self.is_closed() {
*control = ControlFlow::Exit;
}
match *self.0.runner.borrow_mut() {
RunnerEnum::Running(ref mut runner) => {
runner.handle_single_event(event, control);
}
_ => panic!("Cannot handle event synchronously without a runner"),
}
}
// handle_event takes in events and either queues them or applies a callback
//
// It should only ever be called from `run_until_cleared` and `scale_changed`.
fn handle_event(&self, event: Event<'static, T>, control: &mut ControlFlow) {
// It should only ever be called from `run_until_cleared`.
fn handle_event(&self, event: impl Into<EventWrapper<T>>, control: &mut ControlFlow) {
if self.is_closed() {
*control = ControlFlow::Exit;
}
match *self.0.runner.borrow_mut() {
RunnerEnum::Running(ref mut runner) => {
runner.handle_single_event(event, control);
runner.handle_single_event(self, event, control);
}
// If an event is being handled without a runner somehow, add it to the event queue so
// it will eventually be processed
RunnerEnum::Pending => self.0.events.borrow_mut().push_back(event),
RunnerEnum::Pending => self.0.events.borrow_mut().push_back(event.into()),
// If the Runner has been destroyed, there is nothing to do.
RunnerEnum::Destroyed => return,
}
@ -482,7 +404,6 @@ impl<T: 'static> Shared<T> {
fn handle_loop_destroyed(&self, control: &mut ControlFlow) {
self.handle_event(Event::LoopDestroyed, control);
let all_canvases = std::mem::take(&mut *self.0.all_canvases.borrow_mut());
*self.0.scale_change_detector.borrow_mut() = None;
*self.0.unload_event_handle.borrow_mut() = None;
// Dropping the `Runner` drops the event handler closure, which will in
// turn drop all `Window`s moved into the closure.
@ -530,3 +451,18 @@ impl<T: 'static> Shared<T> {
}
}
}
pub(crate) enum EventWrapper<T: 'static> {
Event(Event<'static, T>),
ScaleChange {
canvas: Weak<RefCell<backend::Canvas>>,
size: PhysicalSize<u32>,
scale: f64,
},
}
impl<T> From<Event<'static, T>> for EventWrapper<T> {
fn from(value: Event<'static, T>) -> Self {
Self::Event(value)
}
}