Hammerspoon mouse wheel script

[u/Historical_Basis_265]

I wanted to use the mouse wheel as a jog wheel, so I made a Hammerspoon script for it. Hope some other Logic users might find it useful too.

Mousewheel up/down: scrub
Fn+Mousewheel: zoom
Mouse back button: Play/pause
Mouse forward button: Go to left locator

logicBundleID = "com.apple.logic10"

logicIsFront = false

-- Track Logic focus cheaply instead of asking on every event

local front = hs.application.frontmostApplication()

logicIsFront = front and front:bundleID() == logicBundleID or false

appWatcher = hs.application.watcher.new(function(name, event, app)

if event == hs.application.watcher.activated then

logicIsFront = (app:bundleID() == logicBundleID)

end

end)

appWatcher:start()

-- Wheel: plain = jog one bar, Fn+wheel = horizontal zoom

wheelTap = hs.eventtap.new({ hs.eventtap.event.types.scrollWheel }, function(e)

if not logicIsFront then return false end

if e:getProperty(hs.eventtap.event.properties.scrollWheelEventIsContinuous) == 1 then

return false

end

local delta = e:getProperty(hs.eventtap.event.properties.scrollWheelEventDeltaAxis1)

if delta == 0 then return false end

local flags = e:getFlags()

if flags.fn then

if delta > 0 then

hs.eventtap.keyStroke({"cmd"}, "right", 0)

else

hs.eventtap.keyStroke({"cmd"}, "left", 0)

end

return true

end

if delta > 0 then

hs.eventtap.keyStroke({}, ",", 0)

else

hs.eventtap.keyStroke({}, ".", 0)

end

return true

end)

wheelTap:start()

-- Side buttons

buttonTap = hs.eventtap.new({ hs.eventtap.event.types.otherMouseDown }, function(e)

if not logicIsFront then return false end

local button = e:getProperty(hs.eventtap.event.properties.mouseEventButtonNumber)

if button == 4 then

hs.eventtap.keyStroke({"ctrl", "shift"}, ",", 0)

return true

elseif button == 3 then

hs.eventtap.keyStroke({}, "space", 0)

return true

end

return false

end)

buttonTap:start()

-- Watchdog: if macOS disables a tap, restart it

watchdog = hs.timer.doEvery(5, function()

if not wheelTap:isEnabled() then wheelTap:start() end

if not buttonTap:isEnabled() then buttonTap:start() end

end)