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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018-2021 Maxim Devaev <[email protected]> #
# #
# This program 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. #
# #
# This program 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 this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
from typing import Tuple
from typing import List
from typing import Set
from typing import Iterable
from typing import Optional
from typing import Any
from ....logging import get_logger
from ....keyboard.mappings import OtgKey
from .device import BaseDeviceProcess
from .events import BaseEvent
from .events import ClearEvent
from .events import ResetEvent
from .events import KeyEvent
from .events import ModifierEvent
from .events import make_keyboard_event
from .events import get_led_caps
from .events import get_led_scroll
from .events import get_led_num
from .events import make_keyboard_report
# =====
class KeyboardProcess(BaseDeviceProcess):
def __init__(self, **kwargs: Any) -> None:
super().__init__(
name="keyboard",
read_size=1,
initial_state={"caps": False, "scroll": False, "num": False},
**kwargs,
)
self.__pressed_modifiers: Set[OtgKey] = set()
self.__pressed_keys: List[Optional[OtgKey]] = [None] * 6
def cleanup(self) -> None:
self._stop()
get_logger().info("Clearing HID-keyboard events ...")
self._ensure_write(b"\x00" * 8, close=True) # Release all keys and modifiers
def send_clear_event(self) -> None:
self._clear_queue()
self._queue_event(ClearEvent())
def send_reset_event(self) -> None:
self._clear_queue()
self._queue_event(ResetEvent())
def send_key_events(self, keys: Iterable[Tuple[str, bool]]) -> None:
for (key, state) in keys:
self._queue_event(make_keyboard_event(key, state))
# =====
def _process_read_report(self, report: bytes) -> None:
assert len(report) == 1, report
self._update_state(
caps=get_led_caps(report[0]),
scroll=get_led_scroll(report[0]),
num=get_led_num(report[0]),
)
# =====
def _process_event(self, event: BaseEvent) -> bool:
if isinstance(event, ClearEvent):
return self.__process_clear_event()
elif isinstance(event, ResetEvent):
return self.__process_clear_event(reopen=True)
elif isinstance(event, ModifierEvent):
return self.__process_modifier_event(event)
elif isinstance(event, KeyEvent):
return self.__process_key_event(event)
raise RuntimeError(f"Not implemented event: {event}")
def __process_clear_event(self, reopen: bool=False) -> bool:
self.__clear_modifiers()
self.__clear_keys()
return self.__send_current_state(reopen=reopen)
def __process_modifier_event(self, event: ModifierEvent) -> bool:
if event.modifier in self.__pressed_modifiers:
# Ранее нажатый модификатор отжимаем
self.__pressed_modifiers.remove(event.modifier)
if not self.__send_current_state():
return False
if event.state:
# Нажимаем если нужно
self.__pressed_modifiers.add(event.modifier)
return self.__send_current_state()
return True
def __process_key_event(self, event: KeyEvent) -> bool:
if event.key in self.__pressed_keys:
# Ранее нажатую клавишу отжимаем
self.__pressed_keys[self.__pressed_keys.index(event.key)] = None
if not self.__send_current_state():
return False
elif event.state and None not in self.__pressed_keys:
# Если нужно нажать что-то новое, но свободных слотов нет - отжимаем всё
self.__clear_keys()
if not self.__send_current_state():
return False
if event.state:
# Нажимаем если нужно
self.__pressed_keys[self.__pressed_keys.index(None)] = event.key
return self.__send_current_state()
return True
# =====
def __send_current_state(self, reopen: bool=False) -> bool:
report = make_keyboard_report(self.__pressed_modifiers, self.__pressed_keys)
if not self._ensure_write(report, reopen=reopen):
self.__clear_modifiers()
self.__clear_keys()
return False
return True
def __clear_modifiers(self) -> None:
self.__pressed_modifiers.clear()
def __clear_keys(self) -> None:
self.__pressed_keys = [None] * 6
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