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# -*- coding: utf-8 -*-
# input-remapper - GUI for device specific keyboard mappings
# Copyright (C) 2025 sezanzeb <b8x45ygc9@mozmail.com>
#
# This file is part of input-remapper.
#
# input-remapper is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# input-remapper is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with input-remapper. If not, see <https://www.gnu.org/licenses/>.
from typing import Tuple
import evdev
from evdev.ecodes import EV_ABS
from inputremapper.configs.input_config import InputCombination, InputConfig
from inputremapper.configs.mapping import Mapping
from inputremapper.injection.global_uinputs import GlobalUInputs
from inputremapper.injection.mapping_handlers.mapping_handler import (
MappingHandler,
InputEventHandler,
)
from inputremapper.input_event import InputEvent, EventActions
from inputremapper.utils import get_evdev_constant_name
class AbsToBtnHandler(MappingHandler):
"""Handler which transforms an EV_ABS to a button event."""
_input_config: InputConfig
_active: bool
_sub_handler: InputEventHandler
def __init__(
self,
combination: InputCombination,
mapping: Mapping,
global_uinputs: GlobalUInputs,
**_,
):
super().__init__(combination, mapping, global_uinputs)
self._active = False
self._input_config = combination[0]
assert self._input_config.analog_threshold
assert len(combination) == 1
def __str__(self):
name = get_evdev_constant_name(*self._input_config.type_and_code)
return f'AbsToBtnHandler for "{name}" ' f"{self._input_config.type_and_code}"
def __repr__(self):
return f"<{str(self)} at {hex(id(self))}>"
@property
def child(self): # used for logging
return self._sub_handler
def _trigger_point(self, abs_min: int, abs_max: int) -> Tuple[float, float]:
"""Calculate the axis mid and trigger point."""
# TODO: potentially cache this function
assert self._input_config.analog_threshold
if abs_min == -1 and abs_max == 1:
# this is a hat switch
# return +-1
return (
self._input_config.analog_threshold
// abs(self._input_config.analog_threshold),
0,
)
half_range = (abs_max - abs_min) / 2
middle = half_range + abs_min
trigger_offset = half_range * self._input_config.analog_threshold / 100
# threshold, middle
return middle + trigger_offset, middle
def notify(
self,
event: InputEvent,
source: evdev.InputDevice,
suppress: bool = False,
) -> bool:
if event.input_match_hash != self._input_config.input_match_hash:
return False
absinfo = {
entry[0]: entry[1] for entry in source.capabilities(absinfo=True)[EV_ABS]
}
threshold, mid_point = self._trigger_point(
absinfo[event.code].min, absinfo[event.code].max
)
value = event.value
if (value < threshold > mid_point) or (value > threshold < mid_point):
if self._active:
event = event.modify(value=0, actions=(EventActions.as_key,))
else:
# consume the event.
# We could return False to forward events
return True
else:
if value >= threshold > mid_point:
direction = EventActions.positive_trigger
else:
direction = EventActions.negative_trigger
event = event.modify(value=1, actions=(EventActions.as_key, direction))
self._active = bool(event.value)
# logger.debug(event.event_tuple, "sending to sub_handler")
return self._sub_handler.notify(
event,
source=source,
suppress=suppress,
)
def reset(self) -> None:
self._active = False
self._sub_handler.reset()
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