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AppKit: Trace sendEvent: calls

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Most events in AppKit go through `sendEvent:`, and they contain a lot of
information, so it's nice to surface this when debugging.

We could override `sendEvent:` in UIKit and track this in there too, but
that's much less important, since there the relevant events are fairly
narrowly scoped, see the link below, other events go through CFRunLoop.
https://developer.apple.com/documentation/uikit/uievent/eventtype
This commit is contained in:
Mads Marquart
2026-03-17 05:49:05 +01:00
parent 98692641c4
commit 4998cb990f
1 changed files with 5 additions and 0 deletions
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5
winit-appkit/src/app.rs
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@@ -9,6 +9,7 @@ use objc2::runtime::{Imp, Sel};
use objc2::sel; use objc2::sel;
use objc2_app_kit::{NSApplication, NSEvent, NSEventModifierFlags, NSEventType}; use objc2_app_kit::{NSApplication, NSEvent, NSEventModifierFlags, NSEventType};
use objc2_foundation::MainThreadMarker; use objc2_foundation::MainThreadMarker;
use tracing::trace_span;
use winit_core::event::{DeviceEvent, ElementState}; use winit_core::event::{DeviceEvent, ElementState};
use super::app_state::AppState; use super::app_state::AppState;
@@ -21,6 +22,10 @@ static ORIGINAL: MainThreadBound<Cell<Option<SendEvent>>> = {
}; };
extern "C-unwind" fn send_event(app: &NSApplication, sel: Sel, event: &NSEvent) { extern "C-unwind" fn send_event(app: &NSApplication, sel: Sel, event: &NSEvent) {
// This can be a bit noisy, since `event` is fairly large. Note that you can use
// `RUST_LOG='trace,winit_appkit::app=warn'` if you're debugging and want TRACE-level logs but
// not this.
let _entered = trace_span!("sendEvent:", ?event).entered();
let mtm = MainThreadMarker::from(app); let mtm = MainThreadMarker::from(app);
// Normally, holding Cmd + any key never sends us a `keyUp` event for that key. // Normally, holding Cmd + any key never sends us a `keyUp` event for that key.