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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 .device import BaseEvent
from .device import BaseDeviceProcess
# =====
class _ClearEvent(BaseEvent):
pass
class _ResetEvent(BaseEvent):
pass
@dataclasses.dataclass(frozen=True)
class _ModifierEvent(BaseEvent):
modifier: keymap.OtgKey
state: bool
def __post_init__(self) -> None:
assert self.modifier.is_modifier
@dataclasses.dataclass(frozen=True)
class _KeyEvent(BaseEvent):
key: keymap.OtgKey
state: bool
def __post_init__(self) -> None:
assert not self.key.is_modifier
# =====
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[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 ...")
self._ensure_write(b"\x00" * 8, close=True) # Release all keys and modifiers
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:
otg_key = keymap.KEYMAP[key].otg
if otg_key.is_modifier:
self._queue_event(_ModifierEvent(otg_key, state))
else:
self._queue_event(_KeyEvent(otg_key, state))
# =====
def _process_read_report(self, report: bytes) -> None:
# https://wiki.osdev.org/USB_Human_Interface_Devices#LED_lamps
assert len(report) == 1, report
self._update_state(
caps=bool(report[0] & 2),
scroll=bool(report[0] & 4),
num=bool(report[0] & 1),
)
# =====
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, _ModifierEvent):
self.__process_modifier_event(event)
elif isinstance(event, _KeyEvent):
self.__process_key_event(event)
def __process_clear_event(self, reopen: bool=False) -> None:
self.__clear_modifiers()
self.__clear_keys()
self.__send_current_state(reopen=reopen)
def __process_modifier_event(self, event: _ModifierEvent) -> None:
if event.modifier in self.__pressed_modifiers:
# Ранее нажатый модификатор отжимаем
self.__pressed_modifiers.remove(event.modifier)
if not self.__send_current_state():
return
if event.state:
# Нажимаем если нужно
self.__pressed_modifiers.add(event.modifier)
self.__send_current_state()
def __process_key_event(self, event: _KeyEvent) -> None:
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, reopen: bool=False) -> bool:
if not self._ensure_write(self.__make_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
def __make_report(self) -> bytes:
modifiers = 0
for modifier in self.__pressed_modifiers:
modifiers |= modifier.code
assert len(self.__pressed_keys) == 6
keys = [
(0 if key is None else key.code)
for key in self.__pressed_keys
]
return bytes([modifiers, 0] + keys)
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