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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 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/>. #
# #
# ========================================================================== #
import dataclasses
from typing import List
from typing import Set
from typing import Optional
from typing import Any
from ....logging import get_logger
from .... import keymap
from .hid import BaseEvent
from .hid import DeviceProcess
# =====
class _ClearEvent(BaseEvent):
pass
class _ResetEvent(BaseEvent):
pass
@dataclasses.dataclass(frozen=True)
class _KeyEvent(BaseEvent):
key: keymap.OtgKey
state: bool
# =====
class KeyboardProcess(DeviceProcess):
def __init__(self, **kwargs: Any) -> None:
super().__init__(name="keyboard", **kwargs)
self.__pressed_modifiers: Set[keymap.OtgKey] = set()
self.__pressed_keys: List[Optional[keymap.OtgKey]] = [None] * 6
def cleanup(self) -> None:
self._stop()
get_logger().info("Clearing HID-keyboard events ...")
if self._ensure_device():
try:
self._write_report(b"\x00" * 8) # Release all keys and modifiers
finally:
self._close_device()
def send_clear_event(self) -> None:
self._queue_event(_ClearEvent())
def send_reset_event(self) -> None:
self._queue_event(_ResetEvent())
def send_key_event(self, key: str, state: bool) -> None:
assert key in keymap.KEYMAP
self._queue_event(_KeyEvent(key=keymap.KEYMAP[key].otg, state=state))
# =====
def _process_event(self, event: BaseEvent) -> None:
if isinstance(event, _ClearEvent):
self.__process_clear_event()
elif isinstance(event, _ResetEvent):
self.__process_clear_event(reopen=True)
elif isinstance(event, _KeyEvent):
self.__process_key_event(event)
def __process_clear_event(self, reopen: bool=False) -> None:
self.__clear_modifiers()
self.__clear_keys()
if reopen:
self._close_device()
self.__send_current_state()
def __process_key_event(self, event: _KeyEvent) -> None:
if event.key.is_modifier:
if event.key in self.__pressed_modifiers:
# Ранее нажатый модификатор отжимаем
self.__pressed_modifiers.remove(event.key)
if not self.__send_current_state():
return
if event.state:
# Нажимаем если нужно
self.__pressed_modifiers.add(event.key)
self.__send_current_state()
else: # regular key
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
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
if event.state:
# Нажимаем если нужно
self.__pressed_keys[self.__pressed_keys.index(None)] = event.key
self.__send_current_state()
def __send_current_state(self) -> bool:
ok = False
if self._ensure_device():
modifiers = 0
for key in self.__pressed_modifiers:
assert key.is_modifier
modifiers |= key.code
assert len(self.__pressed_keys) == 6
keys = [
(0 if key is None else key.code)
for key in self.__pressed_keys
]
ok = self._write_report(bytes([modifiers, 0] + keys))
if not ok:
self.__clear_modifiers()
self.__clear_keys()
return ok
def __clear_modifiers(self) -> None:
self.__pressed_modifiers.clear()
def __clear_keys(self) -> None:
self.__pressed_keys = [None] * 6
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