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91 lines
3.0 KiB
Python
91 lines
3.0 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) 2020 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 evdev
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from keymapper.logger import logger
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from keymapper.getdevices import get_devices
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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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When a button was pressed, the newest keycode can be obtained from this
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object. GTK has get_keycode 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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def clear(self):
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"""Next time when reading don't return the previous keycode."""
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# read all of them to clear the buffer or whatever
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for virtual_device in self.virtual_devices:
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while virtual_device.read_one():
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pass
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def start_reading(self, device):
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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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paths = get_devices()[device]['paths']
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logger.debug(
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'Starting reading keycodes for %s on %s',
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device,
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', '.join(paths)
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)
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# Watch over each one of the potentially multiple devices per hardware
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self.virtual_devices = [
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evdev.InputDevice(path)
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for path in paths
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]
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def read(self):
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"""Get the newest keycode or None if none was pressed."""
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newest_keycode = None
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for virtual_device in self.virtual_devices:
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while True:
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event = virtual_device.read_one()
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if event is None:
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break
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logger.spam(
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'got code:%s value:%s',
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event.code + 8, event.value
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)
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if event.type == evdev.ecodes.EV_KEY and event.value == 1:
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# value: 1 for down, 0 for up, 2 for hold.
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# this happens to report key codes that are 8 lower
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# than the ones reported by evtest and used in xkb files
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newest_keycode = event.code + 8
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return newest_keycode
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keycode_reader = _KeycodeReader()
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