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macos: post NumericPad and SecondaryFn flags for synthesized arrow keys

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Hardware-generated arrow key events on macOS carry the NumericPad and
SecondaryFn flags in addition to any user-pressed modifiers. CGEventTap-
based hotkey matchers (tiling window managers, accessibility tools, etc.)
commonly check those flags to disambiguate navigation arrows from generic
chords, and reject events that lack them.

Before this change, synthesized Option+Arrow chords were silently
swallowed by the focused application instead of being captured by the
window manager, because the events arrived with only the Alternate flag
set. Hardware Option+Arrow chords on the local keyboard worked because
the OS itself set the missing flags.

Add NumericPad + SecondaryFn to the flags posted with arrow key events
(Mac key codes 0x7B-0x7E) so synthesized arrow chords match hardware
chords on the wire.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Ty Smith
2026-05-19 16:22:31 -07:00
committed by Ferdinand Schober
parent 7ef43418c9
commit 82d677f9c8
1 changed files with 22 additions and 1 deletions
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23
input-emulation/src/macos.rs
View File

@@ -157,6 +157,19 @@ extern "C" {
fn AXIsProcessTrusted() -> bool;
}
/// Mac virtual key codes for the four arrow keys.
const MAC_KEY_LEFT: u16 = 0x7B;
const MAC_KEY_RIGHT: u16 = 0x7C;
const MAC_KEY_DOWN: u16 = 0x7D;
const MAC_KEY_UP: u16 = 0x7E;
fn is_arrow_key(key: u16) -> bool {
matches!(
key,
MAC_KEY_LEFT | MAC_KEY_RIGHT | MAC_KEY_DOWN | MAC_KEY_UP
)
}
fn key_event(event_source: CGEventSource, key: u16, state: u8, modifiers: XMods) {
let event = match CGEvent::new_keyboard_event(event_source, key, state != 0) {
Ok(e) => e,
@@ -165,7 +178,15 @@ fn key_event(event_source: CGEventSource, key: u16, state: u8, modifiers: XMods)
return;
}
};
event.set_flags(to_cgevent_flags(modifiers));
let mut flags = to_cgevent_flags(modifiers);
// Hardware-generated arrow keys on macOS carry NumericPad + SecondaryFn.
// CGEventTap-based hotkey matchers (e.g. tiling window managers) check
// these flags to recognize navigation keys; without them synthesized
// arrow chords fall through to the focused app.
if is_arrow_key(key) {
flags |= CGEventFlags::CGEventFlagNumericPad | CGEventFlags::CGEventFlagSecondaryFn;
}
event.set_flags(flags);
event.post(CGEventTapLocation::HID);
log::trace!("key event: {key} {state}");
}