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Track macOS click count and pixel-scale wheel scroll

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This commit is contained in:
Viktor Liu
2026-05-20 11:14:01 +02:00
parent 02b9fe704b
commit c28e41e82b
1 changed files with 12 additions and 10 deletions
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22
client/vnc/server/input_darwin.go
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@@ -490,17 +490,19 @@ func (m *MacInputInjector) postButtonTransitions(src uintptr, buttonMask uint8,
func (m *MacInputInjector) postScrollWheel(src uintptr, buttonMask uint8) {
if buttonMask&0x08 != 0 {
m.postScroll(src, scrollLinesPerWheelTick)
m.postScroll(src, scrollPixelsPerWheelTick)
}
if buttonMask&0x10 != 0 {
m.postScroll(src, -scrollLinesPerWheelTick)
m.postScroll(src, -scrollPixelsPerWheelTick)
}
}
// scrollLinesPerWheelTick is what one wheel-button event (VNC button 4 / 5)
// translates to in macOS line units. Three matches the default per-notch
// scroll on macOS and what most VNC clients send for wheel events.
const scrollLinesPerWheelTick int32 = 3
// scrollPixelsPerWheelTick is the pixel delta we post for one VNC wheel
// button event. noVNC accumulates the host wheel/trackpad deltaY and
// emits one press+release per ~10 px, so a real gesture arrives as many
// small events; 20 px per event keeps the resulting macOS scroll fluid
// without overshooting on a single notch.
const scrollPixelsPerWheelTick int32 = 20
func (m *MacInputInjector) postMouse(src uintptr, eventType int32, x, y float64, button int32) {
if cgEventCreateMouseEvent == nil {
@@ -536,11 +538,11 @@ func (m *MacInputInjector) postScroll(src uintptr, deltaY int32) {
return
}
// CGEventCreateScrollWheelEvent(source, units, wheelCount, wheel1delta).
// Line units (1) give the user-facing "one notch = a few lines" feel;
// pixel units (0) would need ~60-80 pixels per notch to match, and
// that depends on screen density. Variadic C function, pass via SyscallN.
// Pixel units (0) feel smoother under noVNC's "one event per ~10 px of
// host wheel" emission than line units (1) where each event jumps a
// whole line. Variadic C function, pass via SyscallN.
r1, _, _ := purego.SyscallN(cgEventCreateScrollWheelEventAddr,
src, 1, 1, uintptr(uint32(deltaY)))
src, 0, 1, uintptr(uint32(deltaY)))
if r1 == 0 {
return
}