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126 lines
4.0 KiB
Python
126 lines
4.0 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# input-remapper - GUI for device specific keyboard mappings
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# Copyright (C) 2022 sezanzeb <proxima@sezanzeb.de>
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#
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# This file is part of input-remapper.
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#
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# input-remapper is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# input-remapper is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with input-remapper. If not, see <https://www.gnu.org/licenses/>.
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from typing import Tuple
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import evdev
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from evdev.ecodes import EV_ABS
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from inputremapper.configs.mapping import Mapping
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from inputremapper.event_combination import EventCombination
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from inputremapper.injection.mapping_handlers.mapping_handler import (
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MappingHandler,
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InputEventHandler,
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)
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from inputremapper.input_event import InputEvent, EventActions
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class AbsToBtnHandler(MappingHandler):
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"""Handler which transforms an EV_ABS to a button event."""
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_input_event: InputEvent
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_active: bool
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_sub_handler: InputEventHandler
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def __init__(
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self,
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combination: EventCombination,
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mapping: Mapping,
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**_,
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):
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super().__init__(combination, mapping)
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self._active = False
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self._input_event = combination[0]
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assert self._input_event.value != 0
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assert len(combination) == 1
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def __str__(self):
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return f"AbsToBtnHandler for {self._input_event.event_tuple} <{id(self)}>:"
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def __repr__(self):
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return self.__str__()
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@property
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def child(self): # used for logging
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return self._sub_handler
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def _trigger_point(self, abs_min: int, abs_max: int) -> Tuple[float, float]:
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"""Calculate the axis mid and trigger point."""
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# TODO: potentially cash this function
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if abs_min == -1 and abs_max == 1:
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# this is a hat switch
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return (
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self._input_event.value // abs(self._input_event.value),
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0,
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) # return +-1
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half_range = (abs_max - abs_min) / 2
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middle = half_range + abs_min
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trigger_offset = half_range * self._input_event.value / 100
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# threshold, middle
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return middle + trigger_offset, middle
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def notify(
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self,
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event: InputEvent,
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source: evdev.InputDevice,
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forward: evdev.UInput,
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supress: bool = False,
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) -> bool:
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if event.type_and_code != self._input_event.type_and_code:
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return False
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absinfo = {
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entry[0]: entry[1] for entry in source.capabilities(absinfo=True)[EV_ABS]
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}
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threshold, mid_point = self._trigger_point(
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absinfo[event.code].min, absinfo[event.code].max
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)
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value = event.value
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if (value < threshold > mid_point) or (value > threshold < mid_point):
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if self._active:
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event = event.modify(value=0, actions=(EventActions.as_key,))
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else:
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# consume the event.
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# We could return False to forward events
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return True
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else:
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if value >= threshold > mid_point:
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direction = EventActions.positive_trigger
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else:
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direction = EventActions.negative_trigger
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event = event.modify(value=1, actions=(EventActions.as_key, direction))
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self._active = bool(event.value)
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# logger.debug_key(event.event_tuple, "sending to sub_handler")
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return self._sub_handler.notify(
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event,
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source=source,
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forward=forward,
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supress=supress,
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)
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def reset(self) -> None:
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self._active = False
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self._sub_handler.reset()
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