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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 Dict, Tuple, Hashable
import evdev
from inputremapper.configs.input_config import InputCombination
from inputremapper.configs.input_config import InputConfig
from inputremapper.configs.mapping import Mapping
from inputremapper.injection.global_uinputs import GlobalUInputs
from inputremapper.injection.mapping_handlers.mapping_handler import (
MappingHandler,
HandlerEnums,
InputEventHandler,
ContextProtocol,
)
from inputremapper.input_event import InputEvent, EventActions
from inputremapper.logging.logger import logger
from inputremapper.utils import get_device_hash
class AxisSwitchHandler(MappingHandler):
"""Enables or disables an axis.
Generally, if multiple events are mapped to something in a combination, all of
them need to be triggered in order to map to the output.
If an analog input is combined with a key input, then the same thing should happen.
The key needs to be pressed and the joystick needs to be moved in order to generate
output.
"""
_map_axis: InputConfig # the InputConfig for the axis we switch on or off
_trigger_keys: Tuple[Hashable, ...] # all events that can switch the axis
_active: bool # whether the axis is on or off
_last_value: int # the value of the last axis event that arrived
_axis_source: evdev.InputDevice # the cached source of the axis input events
_forward_device: evdev.UInput # the cached forward uinput
_sub_handler: InputEventHandler
def __init__(
self,
combination: InputCombination,
mapping: Mapping,
context: ContextProtocol,
global_uinputs: GlobalUInputs,
**_,
):
super().__init__(combination, mapping, global_uinputs)
trigger_keys = tuple(
event.input_match_hash
for event in combination
if not event.defines_analog_input
)
assert len(trigger_keys) >= 1
assert (map_axis := combination.find_analog_input_config())
self._map_axis = map_axis
self._trigger_keys = trigger_keys
self._active = False
self._last_value = 0
self._axis_source = None
self._forward_device = None
self.context = context
def __str__(self):
return f"AxisSwitchHandler for {self._map_axis.type_and_code}"
def __repr__(self):
return f"<{str(self)} at {hex(id(self))}>"
@property
def child(self):
return self._sub_handler
def _handle_key_input(self, event: InputEvent):
"""If a key is pressed, allow mapping analog events in subhandlers.
Analog events (e.g. ABS_X, REL_Y) that have gone through Handlers that
transform them to buttons also count as keys.
"""
key_is_pressed = bool(event.value)
if self._active == key_is_pressed:
# nothing changed
return False
self._active = key_is_pressed
if self._axis_source is None:
return True
if not key_is_pressed:
# recenter the axis
logger.debug("Stopping axis for %s", self.mapping.input_combination)
event = InputEvent(
0,
0,
*self._map_axis.type_and_code,
0,
actions=(EventActions.recenter,),
origin_hash=self._map_axis.origin_hash,
)
self._sub_handler.notify(event, self._axis_source)
return True
if self._map_axis.type == evdev.ecodes.EV_ABS:
# send the last cached value so that the abs axis
# is at the correct position
logger.debug("Starting axis for %s", self.mapping.input_combination)
event = InputEvent(
0,
0,
*self._map_axis.type_and_code,
self._last_value,
origin_hash=self._map_axis.origin_hash,
)
self._sub_handler.notify(event, self._axis_source)
return True
return True
def _should_map(self, event: InputEvent):
return (
event.input_match_hash in self._trigger_keys
or event.input_match_hash == self._map_axis.input_match_hash
)
def notify(
self,
event: InputEvent,
source: evdev.InputDevice,
suppress: bool = False,
) -> bool:
if not self._should_map(event):
return False
if event.is_key_event:
return self._handle_key_input(event)
# do some caching so that we can generate the
# recenter event and an initial abs event
if self._axis_source is None:
self._axis_source = source
if self._forward_device is None:
device_hash = get_device_hash(source)
self._forward_device = self.context.get_forward_uinput(device_hash)
# always cache the value
self._last_value = event.value
if self._active:
return self._sub_handler.notify(event, source, suppress)
return False
def reset(self) -> None:
self._last_value = 0
self._active = False
self._sub_handler.reset()
def needs_wrapping(self) -> bool:
return True
def wrap_with(self) -> Dict[InputCombination, HandlerEnums]:
combination = [
config for config in self.input_configs if not config.defines_analog_input
]
return {InputCombination(combination): HandlerEnums.combination}
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