mirror of
https://github.com/sezanzeb/input-remapper
synced 2024-11-08 07:10:36 +00:00
359 lines
12 KiB
Python
359 lines
12 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# key-mapper - GUI for device specific keyboard mappings
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# Copyright (C) 2021 sezanzeb <proxima@hip70890b.de>
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#
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# This file is part of key-mapper.
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#
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# key-mapper 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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# key-mapper 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 key-mapper. If not, see <https://www.gnu.org/licenses/>.
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"""Keeps reading keycodes in the background for the UI to use."""
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import sys
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import time
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import select
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import multiprocessing
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import threading
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import evdev
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from evdev.ecodes import EV_KEY, EV_ABS, ABS_MISC, EV_REL
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from keymapper.logger import logger
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from keymapper.key import Key
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from keymapper.state import custom_mapping
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from keymapper.getdevices import get_devices
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from keymapper import utils
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CLOSE = 1
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PRIORITIES = {
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EV_KEY: 100,
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EV_ABS: 50,
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}
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FILTER_THRESHOLD = 0.01
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DEBOUNCE_TICKS = 3
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def prioritize(events):
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"""Return the event that is most likely desired to be mapped.
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KEY over ABS and everything over ABS_MISC.
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"""
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events = [
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event for event in events
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if event is not None
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]
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return sorted(events, key=lambda e: (
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PRIORITIES.get(e.type, 0),
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not (e.type == EV_ABS and e.code == ABS_MISC),
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abs(e.value)
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))[-1]
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def will_report_up(ev_type):
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"""Check if this event will ever report a key up (wheels)."""
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return ev_type != EV_REL
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def event_unix_time(event):
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"""Get the unix timestamp of an event."""
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if event is None:
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return 0
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return event.sec + event.usec / 1000000
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class _KeycodeReader:
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"""Keeps reading keycodes in the background for the UI to use.
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Does not serve any purpose for the injection service.
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When a button was pressed, the newest keycode can be obtained from this
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object. GTK has get_key for keyboard keys, but KeycodeReader also
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has knowledge of buttons like the middle-mouse button.
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"""
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def __init__(self):
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self.virtual_devices = []
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self._pipe = None
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self._process = None
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self.fail_counter = 0
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self.previous_event = None
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self.previous_result = None
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self._unreleased = {}
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self._debounce_remove = {}
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def __del__(self):
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self.stop_reading()
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def stop_reading(self):
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"""Stop reading keycodes."""
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if self._pipe is not None:
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logger.debug('Sending close msg to reader')
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self._pipe[0].send(CLOSE)
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self._pipe = None
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def clear(self):
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"""Next time when reading don't return the previous keycode."""
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# just call read to clear the pipe
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self.read()
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self._unreleased = {}
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self.previous_event = None
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self.previous_result = None
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def start_reading(self, device_name):
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"""Tell the evdev lib to start looking for keycodes.
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If read is called without prior start_reading, no keycodes
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will be available.
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"""
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if self._pipe is not None:
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self.stop_reading()
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time.sleep(0.1)
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self.virtual_devices = []
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for name, group in get_devices().items():
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if device_name not in name:
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continue
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# Watch over each one of the potentially multiple devices per
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# hardware
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for path in group['paths']:
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try:
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device = evdev.InputDevice(path)
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except FileNotFoundError:
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continue
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if evdev.ecodes.EV_KEY in device.capabilities():
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self.virtual_devices.append(device)
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logger.debug(
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'Starting reading keycodes from "%s"',
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'", "'.join([device.name for device in self.virtual_devices])
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)
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pipe = multiprocessing.Pipe()
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self._pipe = pipe
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self._process = threading.Thread(target=self._read_worker)
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self._process.start()
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def _pipe_event(self, event, device):
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"""Write the event into the pipe to the main process."""
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# value: 1 for down, 0 for up, 2 for hold.
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if self._pipe is None or self._pipe[1].closed:
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logger.debug('Pipe closed, reader stops.')
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sys.exit(0)
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if event.type == EV_KEY and event.value == 2:
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# ignore hold-down events
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return
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click_events = [
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evdev.ecodes.BTN_LEFT,
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evdev.ecodes.BTN_TOOL_DOUBLETAP
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]
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if event.type == EV_KEY and event.code in click_events:
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# disable mapping the left mouse button because it would break
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# the mouse. Also it is emitted right when focusing the row
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# which breaks the current workflow.
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return
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if not utils.should_map_event_as_btn(event, custom_mapping):
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return
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max_abs = utils.get_max_abs(device)
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event.value = utils.normalize_value(event, max_abs)
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self._pipe[1].send(event)
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def _read_worker(self):
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"""Thread that reads keycodes and buffers them into a pipe."""
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# using a thread that blocks instead of read_one made it easier
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# to debug via the logs, because the UI was not polling properly
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# at some point which caused logs for events not to be written.
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rlist = {device.fd: device for device in self.virtual_devices}
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rlist[self._pipe[1]] = self._pipe[1]
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while True:
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ready = select.select(rlist, [], [])[0]
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for fd in ready:
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readable = rlist[fd] # a device or a pipe
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if isinstance(readable, multiprocessing.connection.Connection):
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msg = readable.recv()
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if msg == CLOSE:
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logger.debug('Reader stopped')
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return
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continue
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try:
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for event in rlist[fd].read():
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self._pipe_event(event, readable)
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except OSError:
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logger.debug(
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'Device "%s" disappeared from the reader',
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rlist[fd].path
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)
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del rlist[fd]
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def get_unreleased_keys(self):
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"""Get a Key object of the current keyboard state."""
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unreleased = list(self._unreleased.values())
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if len(unreleased) == 0:
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return None
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return Key(*unreleased)
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def _release(self, type_code):
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"""Modify the state to recognize the releasing of the key."""
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if type_code in self._unreleased:
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del self._unreleased[type_code]
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if type_code in self._debounce_remove:
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del self._debounce_remove[type_code]
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def _debounce_start(self, event_tuple):
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"""Act like the key was released if no new event arrives in time."""
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if not will_report_up(event_tuple[0]):
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self._debounce_remove[event_tuple[:2]] = DEBOUNCE_TICKS
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def _debounce_tick(self):
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"""If the counter reaches 0, the key is not considered held down."""
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for type_code in list(self._debounce_remove.keys()):
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if type_code not in self._unreleased:
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continue
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# clear wheel events from unreleased after some time
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if self._debounce_remove[type_code] == 0:
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logger.key_spam(
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self._unreleased[type_code],
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'Considered as released'
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)
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self._release(type_code)
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else:
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self._debounce_remove[type_code] -= 1
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def read(self):
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"""Get the newest key/combination as Key object.
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Only reports keys from down-events.
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On key-down events the pipe returns changed combinations. Release
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events won't cause that and the reader will return None as in
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"nothing new to report". So In order to change a combination, one
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of its keys has to be released and then a different one pressed.
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Otherwise making combinations wouldn't be possible. Because at
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some point the keys have to be released, and that shouldn't cause
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the combination to get trimmed.
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If the timing of two recent events is very close, prioritize
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key events over abs events.
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"""
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# this is in some ways similar to the keycode_mapper and
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# event_producer, but its much simpler because it doesn't
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# have to trigger anything, manage any macros and only
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# reports key-down events. This function is called periodically
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# by the window.
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if self._pipe is None:
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self.fail_counter += 1
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if self.fail_counter % 10 == 0: # spam less
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logger.debug('No pipe available to read from')
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return None
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# remember the prevous down-event from the pipe in order to
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# be able to prioritize events, and to be able to tell if the reader
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# should return the updated combination
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previous_event = self.previous_event
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key_down_received = False
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self._debounce_tick()
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while self._pipe[0].poll():
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# loop over all new and unhandled events
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event = self._pipe[0].recv()
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event_tuple = (event.type, event.code, event.value)
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type_code = (event.type, event.code)
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if event.value == 0:
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logger.key_spam(event_tuple, 'release')
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self._release(type_code)
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continue
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if self._unreleased.get(type_code) == event_tuple:
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logger.key_spam(event_tuple, 'duplicate key down')
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self._debounce_start(event_tuple)
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continue
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delta = event_unix_time(event) - event_unix_time(previous_event)
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if delta < FILTER_THRESHOLD:
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if prioritize([previous_event, event]) == previous_event:
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# two events happened very close, probably some weird
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# spam from the device. The wacom intuos 5 adds an
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# ABS_MISC event to every button press, filter that out
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logger.key_spam(event_tuple, 'ignoring new event')
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continue
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# the previous event of the previous iteration is ignored.
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# clean stuff up to remove its side effects
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prev_tuple = (
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previous_event.type,
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previous_event.code,
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previous_event.value
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)
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if prev_tuple[:2] in self._unreleased:
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logger.key_spam(
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event_tuple,
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'ignoring previous event %s', prev_tuple
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)
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self._release(prev_tuple[:2])
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# to keep track of combinations.
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# "I have got this release event, what was this for?" A release
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# event for a D-Pad axis might be any direction, hence this maps
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# from release to input in order to remember it. Since all release
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# events have value 0, the value is not used in the key.
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key_down_received = True
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logger.key_spam(event_tuple, 'down')
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self._unreleased[type_code] = event_tuple
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self._debounce_start(event_tuple)
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previous_event = event
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if not key_down_received:
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# This prevents writing a subset of the combination into
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# result after keys were released. In order to control the gui,
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# they have to be released.
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return None
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self.previous_event = previous_event
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if len(self._unreleased) > 0:
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result = Key(*self._unreleased.values())
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if result == self.previous_result:
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# don't return the same stuff twice
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return None
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self.previous_result = result
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logger.key_spam(result.keys, 'read result')
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return result
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return None
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keycode_reader = _KeycodeReader()
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