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# This file is part of Gajim.
#
# Gajim 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; version 3 only.
#
# Gajim 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 Gajim. If not, see <http://www.gnu.org/licenses/>.
# Based on https://learn.microsoft.com/en-us/windows/apps/desktop/modernize/apply-windows-themes
from __future__ import annotations
from typing import Callable
from typing import Optional
import logging
from winsdk.windows.ui import Color
from winsdk.windows.ui.viewmanagement import UIColorType
from winsdk.windows.ui.viewmanagement import UISettings
from gajim.common import app
from gajim.common.events import StyleChanged
log = logging.getLogger('gajim.c.winapi.system_style')
class SystemStyleListener:
def __init__(self, callback: Callable[..., None]) -> None:
self._prefer_dark: Optional[bool] = None
self._callback = callback
self._ui_settings = UISettings()
self._ui_settings.add_color_values_changed(
self._signal_color_values_changed)
foreground_color = self._ui_settings.get_color_value(
UIColorType.FOREGROUND)
self._prefer_dark = self._is_color_light(foreground_color)
@staticmethod
def _is_color_light(clr: Color) -> bool:
return ((5 * clr.g) + (2 * clr.r) + clr.b) > (8 * 128)
def _signal_color_values_changed(self, ui_settings: UISettings, _) -> None:
foreground_color = ui_settings.get_color_value(UIColorType.FOREGROUND)
dark_theme = self._is_color_light(foreground_color)
if dark_theme != self._prefer_dark:
self._prefer_dark = dark_theme
self._callback()
app.ged.raise_event(StyleChanged())
@property
def prefer_dark(self) -> Optional[bool]:
return self._prefer_dark
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