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Nov 23, 2025
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Avoid Event enum in examples #277

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13 changes: 7 additions & 6 deletions README.md
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -88,11 +88,15 @@ fn main() {
},
|_elwt, window| softbuffer::Surface::new(&context, window.clone()).unwrap(),
)
.with_event_handler(|window, surface, event, elwt| {
.with_event_handler(|window, surface, window_id, event, elwt| {
elwt.set_control_flow(ControlFlow::Wait);

if window_id != window.id() {
return;
}

match event {
Event::WindowEvent { window_id, event: WindowEvent::RedrawRequested } if window_id == window.id() => {
WindowEvent::RedrawRequested => {
let Some(surface) = surface else {
eprintln!("RedrawRequested fired before Resumed or after Suspended");
return;
Expand Down Expand Up @@ -121,10 +125,7 @@ fn main() {

buffer.present().unwrap();
}
Event::WindowEvent {
event: WindowEvent::CloseRequested,
window_id,
} if window_id == window.id() => {
WindowEvent::CloseRequested => {
elwt.exit();
}
_ => {}
Expand Down
41 changes: 18 additions & 23 deletions examples/animation.rs
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ use rayon::prelude::*;
use std::f64::consts::PI;
use std::num::NonZeroU32;
use web_time::Instant;
use winit::event::{Event, KeyEvent, WindowEvent};
use winit::event::{KeyEvent, WindowEvent};
use winit::event_loop::{ControlFlow, EventLoop};
use winit::keyboard::{Key, NamedKey};

Expand All @@ -29,16 +29,17 @@ fn main() {
softbuffer::Surface::new(&context, window.clone()).unwrap()
},
)
.with_event_handler(move |state, surface, event, elwt| {
.with_event_handler(move |state, surface, window_id, event, elwt| {
let (window, old_size, frames) = state;

elwt.set_control_flow(ControlFlow::Poll);

if window_id != window.id() {
return;
}

match event {
Event::WindowEvent {
window_id,
event: WindowEvent::Resized(size),
} if window_id == window.id() => {
WindowEvent::Resized(size) => {
let Some(surface) = surface else {
eprintln!("Resized fired before Resumed or after Suspended");
return;
Expand All @@ -50,10 +51,7 @@ fn main() {
surface.resize(width, height).unwrap();
}
}
Event::WindowEvent {
window_id,
event: WindowEvent::RedrawRequested,
} if window_id == window.id() => {
WindowEvent::RedrawRequested => {
let Some(surface) = surface else {
eprintln!("RedrawRequested fired before Resumed or after Suspended");
return;
Expand All @@ -77,26 +75,23 @@ fn main() {
buffer.present().unwrap();
}
}
Event::AboutToWait => {
window.request_redraw();
}
Event::WindowEvent {
WindowEvent::CloseRequested
| WindowEvent::KeyboardInput {
event:
WindowEvent::CloseRequested
| WindowEvent::KeyboardInput {
event:
KeyEvent {
logical_key: Key::Named(NamedKey::Escape),
..
},
KeyEvent {
logical_key: Key::Named(NamedKey::Escape),
..
},
window_id,
} if window_id == window.id() => {
..
} => {
elwt.exit();
}
_ => {}
}
})
.with_about_to_wait_handler(|state, _, _| {
let (window, _, _) = state;
window.request_redraw();
});

winit_app::run_app(event_loop, app);
Expand Down
29 changes: 13 additions & 16 deletions examples/fruit.rs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
use image::GenericImageView;
use std::num::NonZeroU32;
use winit::event::{Event, KeyEvent, WindowEvent};
use winit::event::{KeyEvent, WindowEvent};
use winit::event_loop::{ControlFlow, EventLoop};
use winit::keyboard::{Key, NamedKey};

Expand Down Expand Up @@ -35,14 +35,15 @@ fn main() {
surface
},
)
.with_event_handler(move |window, surface, event, elwt| {
.with_event_handler(move |window, surface, window_id, event, elwt| {
elwt.set_control_flow(ControlFlow::Wait);

if window_id != window.id() {
return;
}

match event {
Event::WindowEvent {
window_id,
event: WindowEvent::RedrawRequested,
} if window_id == window.id() => {
WindowEvent::RedrawRequested => {
let Some(surface) = surface else {
eprintln!("RedrawRequested fired before Resumed or after Suspended");
return;
Expand All @@ -61,19 +62,15 @@ fn main() {

buffer.present().unwrap();
}
Event::WindowEvent {
WindowEvent::CloseRequested
| WindowEvent::KeyboardInput {
event:
WindowEvent::CloseRequested
| WindowEvent::KeyboardInput {
event:
KeyEvent {
logical_key: Key::Named(NamedKey::Escape),
..
},
KeyEvent {
logical_key: Key::Named(NamedKey::Escape),
..
},
window_id,
} if window_id == window.id() => {
..
} => {
elwt.exit();
}
_ => {}
Expand Down
50 changes: 20 additions & 30 deletions examples/rectangle.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
use std::num::NonZeroU32;
use winit::event::{ElementState, Event, KeyEvent, WindowEvent};
use winit::event::{ElementState, KeyEvent, WindowEvent};
use winit::event_loop::{ControlFlow, EventLoop};
use winit::keyboard::{Key, NamedKey};

Expand Down Expand Up @@ -38,16 +38,17 @@ fn main() {
},
move |_elwt, (window, _flag)| softbuffer::Surface::new(&context, window.clone()).unwrap(),
)
.with_event_handler(|state, surface, event, elwt| {
.with_event_handler(|state, surface, window_id, event, elwt| {
let (window, flag) = state;

elwt.set_control_flow(ControlFlow::Wait);

if window_id != window.id() {
return;
}

match event {
Event::WindowEvent {
window_id,
event: WindowEvent::Resized(size),
} if window_id == window.id() => {
WindowEvent::Resized(size) => {
let Some(surface) = surface else {
eprintln!("Resized fired before Resumed or after Suspended");
return;
Expand All @@ -60,10 +61,7 @@ fn main() {
surface.resize(width, height).unwrap();
}
}
Event::WindowEvent {
window_id,
event: WindowEvent::RedrawRequested,
} if window_id == window.id() => {
WindowEvent::RedrawRequested => {
let Some(surface) = surface else {
eprintln!("RedrawRequested fired before Resumed or after Suspended");
return;
Expand All @@ -85,35 +83,27 @@ fn main() {
}
}

Event::WindowEvent {
WindowEvent::CloseRequested
| WindowEvent::KeyboardInput {
event:
WindowEvent::CloseRequested
| WindowEvent::KeyboardInput {
event:
KeyEvent {
logical_key: Key::Named(NamedKey::Escape),
..
},
KeyEvent {
logical_key: Key::Named(NamedKey::Escape),
..
},
window_id,
} if window_id == window.id() => {
..
} => {
elwt.exit();
}

Event::WindowEvent {
WindowEvent::KeyboardInput {
event:
WindowEvent::KeyboardInput {
event:
KeyEvent {
state: ElementState::Pressed,
logical_key: Key::Named(NamedKey::Space),
..
},
KeyEvent {
state: ElementState::Pressed,
logical_key: Key::Named(NamedKey::Space),
..
},
window_id,
} if window_id == window.id() => {
..
} => {
// Flip the rectangle flag and request a redraw to show the changed image
*flag = !*flag;
window.request_redraw();
Expand Down
65 changes: 42 additions & 23 deletions examples/utils/winit_app.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ use std::marker::PhantomData;
use std::rc::Rc;

use winit::application::ApplicationHandler;
use winit::event::{Event, WindowEvent};
use winit::event::WindowEvent;
use winit::event_loop::{ActiveEventLoop, EventLoop};
use winit::window::{Window, WindowAttributes, WindowId};

Expand Down Expand Up @@ -31,7 +31,7 @@ pub(crate) fn make_window(
}

/// Easily constructable winit application.
pub(crate) struct WinitApp<T, S, Init, InitSurface, Handler> {
pub(crate) struct WinitApp<T, S, Init, InitSurface, Handler, AboutToWaitHandler> {
/// Closure to initialize `state`.
init: Init,

Expand All @@ -41,6 +41,9 @@ pub(crate) struct WinitApp<T, S, Init, InitSurface, Handler> {
/// Closure to run on window events.
event: Handler,

/// Closure to run on about_to_wait events.
about_to_wait: AboutToWaitHandler,

/// Contained state.
state: Option<T>,

Expand Down Expand Up @@ -75,38 +78,63 @@ where
}

/// Build a new application.
pub(crate) fn with_event_handler<F>(self, handler: F) -> WinitApp<T, S, Init, InitSurface, F>
#[allow(clippy::type_complexity)]
pub(crate) fn with_event_handler<F>(
self,
handler: F,
) -> WinitApp<T, S, Init, InitSurface, F, impl FnMut(&mut T, Option<&mut S>, &ActiveEventLoop)>
where
F: FnMut(&mut T, Option<&mut S>, Event<()>, &ActiveEventLoop),
F: FnMut(&mut T, Option<&mut S>, WindowId, WindowEvent, &ActiveEventLoop),
{
WinitApp::new(self.init, self.init_surface, handler)
WinitApp::new(self.init, self.init_surface, handler, |_, _, _| {})
}
}

impl<T, S, Init, InitSurface, Handler> WinitApp<T, S, Init, InitSurface, Handler>
impl<T, S, Init, InitSurface, Handler, AboutToWaitHandler>
WinitApp<T, S, Init, InitSurface, Handler, AboutToWaitHandler>
where
Init: FnMut(&ActiveEventLoop) -> T,
InitSurface: FnMut(&ActiveEventLoop, &mut T) -> S,
Handler: FnMut(&mut T, Option<&mut S>, Event<()>, &ActiveEventLoop),
Handler: FnMut(&mut T, Option<&mut S>, WindowId, WindowEvent, &ActiveEventLoop),
AboutToWaitHandler: FnMut(&mut T, Option<&mut S>, &ActiveEventLoop),
{
/// Create a new application.
pub(crate) fn new(init: Init, init_surface: InitSurface, event: Handler) -> Self {
pub(crate) fn new(
init: Init,
init_surface: InitSurface,
event: Handler,
about_to_wait: AboutToWaitHandler,
) -> Self {
Self {
init,
init_surface,
event,
about_to_wait,
state: None,
surface_state: None,
}
}

/// Build a new application.
#[allow(dead_code)]
pub(crate) fn with_about_to_wait_handler<F>(
self,
about_to_wait: F,
) -> WinitApp<T, S, Init, InitSurface, Handler, F>
where
F: FnMut(&mut T, Option<&mut S>, &ActiveEventLoop),
{
WinitApp::new(self.init, self.init_surface, self.event, about_to_wait)
}
}

impl<T, S, Init, InitSurface, Handler> ApplicationHandler
for WinitApp<T, S, Init, InitSurface, Handler>
impl<T, S, Init, InitSurface, Handler, AboutToWaitHandler> ApplicationHandler
for WinitApp<T, S, Init, InitSurface, Handler, AboutToWaitHandler>
where
Init: FnMut(&ActiveEventLoop) -> T,
InitSurface: FnMut(&ActiveEventLoop, &mut T) -> S,
Handler: FnMut(&mut T, Option<&mut S>, Event<()>, &ActiveEventLoop),
Handler: FnMut(&mut T, Option<&mut S>, WindowId, WindowEvent, &ActiveEventLoop),
AboutToWaitHandler: FnMut(&mut T, Option<&mut S>, &ActiveEventLoop),
{
fn resumed(&mut self, el: &ActiveEventLoop) {
debug_assert!(self.state.is_none());
Expand All @@ -129,22 +157,13 @@ where
) {
let state = self.state.as_mut().unwrap();
let surface_state = self.surface_state.as_mut();
(self.event)(
state,
surface_state,
Event::WindowEvent { window_id, event },
event_loop,
);
(self.event)(state, surface_state, window_id, event, event_loop);
}

fn about_to_wait(&mut self, event_loop: &ActiveEventLoop) {
if let Some(state) = self.state.as_mut() {
(self.event)(
state,
self.surface_state.as_mut(),
Event::AboutToWait,
event_loop,
);
let surface_state = self.surface_state.as_mut();
(self.about_to_wait)(state, surface_state, event_loop);
}
}
}
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