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feat(tui): preserve modifiers on mouse wheel events

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Decode Shift, Meta, and Ctrl bits from SGR and legacy X10 wheel event button bytes so TUI input handlers can distinguish modified wheel gestures from plain scrolling.
This commit is contained in:
Brooklyn Nicholson 2026-04-29 20:39:39 -05:00
parent 9fc9c15b4a
commit b978fd8b26
2 changed files with 79 additions and 5 deletions
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27
ui-tui/packages/hermes-ink/src/ink/parse-keypress.ts
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@ -697,16 +697,17 @@ function parseKeypress(s: string = ''): ParsedKey {
// never reach here. Mask with 0x43 (bits 6+1+0) to check wheel-flag
// + direction while ignoring modifier bits (Shift=0x04, Meta=0x08,
// Ctrl=0x10) — modified wheel events (e.g. Ctrl+scroll, button=80)
// should still be recognized as wheelup/wheeldown.
// should still be recognized as wheelup/wheeldown. Preserve those
// modifier bits for callers that bind modified wheel gestures.
if ((match = SGR_MOUSE_RE.exec(s))) {
const button = parseInt(match[1]!, 10)
if ((button & 0x43) === 0x40) {
return createNavKey(s, 'wheelup', false)
return createWheelKey(s, 'wheelup', button)
}
if ((button & 0x43) === 0x41) {
return createNavKey(s, 'wheeldown', false)
return createWheelKey(s, 'wheeldown', button)
}
// Shouldn't reach here (parseMouseEvent catches non-wheel) but be safe
@ -722,11 +723,11 @@ function parseKeypress(s: string = ''): ParsedKey {
const button = s.charCodeAt(3) - 32
if ((button & 0x43) === 0x40) {
return createNavKey(s, 'wheelup', false)
return createWheelKey(s, 'wheelup', button)
}
if ((button & 0x43) === 0x41) {
return createNavKey(s, 'wheeldown', false)
return createWheelKey(s, 'wheeldown', button)
}
return createNavKey(s, 'mouse', false)
@ -834,3 +835,19 @@ function createNavKey(s: string, name: string, ctrl: boolean): ParsedKey {
isPasted: false
}
}
function createWheelKey(s: string, name: 'wheelup' | 'wheeldown', button: number): ParsedKey {
return {
kind: 'key',
name,
ctrl: !!(button & 0x10),
meta: !!(button & 0x08),
shift: !!(button & 0x04),
option: false,
super: false,
fn: false,
sequence: s,
raw: s,
isPasted: false
}
}