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-- SPDX-License-Identifier: MIT
--
-- This is an example libinput plugin
--
-- This plugin maps a downwards mouse wheel to a button down event and
-- an upwards wheel movement to a button up event.
-- UNCOMMENT THIS LINE TO ACTIVATE THE PLUGIN
-- libinput:register({1})
-- The button we want to press on wheel events
local wheel_button = evdev.BTN_EXTRA
local button_states = {}
local function evdev_frame(device, frame, timestamp)
local events = {}
local modified = false
for _, v in ipairs(frame) do
if v.usage == evdev.REL_WHEEL then
-- REL_WHEEL is inverted, neg value -> down, pos value -> up
if v.value < 0 then
if not button_states[device] then
table.insert(events, { usage = wheel_button, value = 1 })
button_states[device] = true
end
else
if button_states[device] then
table.insert(events, { usage = wheel_button, value = 0 })
button_states[device] = false
end
end
modified = true
-- Because REL_WHEEL is no longer a wheel, the high-res
-- events are dropped
elseif v.usage == evdev.REL_WHEEL_HI_RES then
modified = true
else
table.insert(events, v)
end
end
if modified then
return events
else
return nil
end
end
local function device_new(device)
local usages = device:usages()
if usages[evdev.REL_WHEEL] then
button_states[device] = false
if not usages[wheel_button] then
device:enable_evdev_usage(wheel_button)
end
device:connect("evdev-frame", evdev_frame)
device:connect("device-removed", function(dev)
button_states[dev] = nil
end)
end
end
libinput:connect("new-evdev-device", device_new)
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