58 lines
2.2 KiB
Python
58 lines
2.2 KiB
Python
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"""Hotkey-Listener via evdev für Push-to-Talk."""
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import asyncio
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import logging
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from pathlib import Path
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from typing import Callable, Coroutine
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import evdev
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from evdev import InputDevice, categorize, ecodes
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logger = logging.getLogger(__name__)
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AsyncCallback = Callable[[], Coroutine]
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def find_keyboard_device() -> InputDevice:
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"""Findet das erste Keyboard-Device in /dev/input/."""
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devices = [InputDevice(path) for path in evdev.list_devices()]
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for device in devices:
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capabilities = device.capabilities(verbose=True)
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for (etype_name, _etype_code), events in capabilities.items():
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if etype_name == "EV_KEY":
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key_names = [name for name, _code in events]
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if "KEY_A" in key_names:
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logger.info("Keyboard gefunden: %s (%s)", device.name, device.path)
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return device
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raise RuntimeError("Kein Keyboard-Device gefunden in /dev/input/")
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class HotkeyListener:
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def __init__(self, key_name: str = "KEY_F12"):
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self.key_name = key_name
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self.key_code = ecodes.ecodes.get(key_name)
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if self.key_code is None:
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raise ValueError(f"Unbekannter Key-Name: {key_name}")
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self.on_press: AsyncCallback | None = None
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self.on_release: AsyncCallback | None = None
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async def _handle_key_event(self, key_down: bool) -> None:
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"""Ruft den passenden Callback auf."""
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if key_down and self.on_press:
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await self.on_press()
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elif not key_down and self.on_release:
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await self.on_release()
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async def listen(self) -> None:
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"""Lauscht auf evdev-Events der konfigurierten Taste."""
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device = find_keyboard_device()
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logger.info("Lausche auf %s auf %s", self.key_name, device.name)
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async for event in device.async_read_loop():
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if event.type == ecodes.EV_KEY and event.code == self.key_code:
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if event.value == 1: # Key down
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logger.debug("%s gedrückt", self.key_name)
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await self._handle_key_event(key_down=True)
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elif event.value == 0: # Key up
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logger.debug("%s losgelassen", self.key_name)
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await self._handle_key_event(key_down=False)
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