#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""QDarkStyle is a dark stylesheet for Python and Qt applications."""
# pylint: disable=invalid-name
# Standard library imports
import logging
import os
import platform
import warnings
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QCoreApplication, QFile, QTextStream
from PyQt5.QtGui import QColor, QPalette
# Local imports
from qdarkstyle.palette import DarkPalette
from qdarkstyle.constants import PACKAGE_PATH, QSS_FILE
from qdarkstyle import style_rc
_logger = logging.getLogger(__name__)
def _apply_os_patches() -> str:
"""
Apply OS-only specific stylesheet patches.
Returns:
str: stylesheet string (css).
"""
os_fix = ""
if platform.system().lower() == 'darwin':
# See issue #12
os_fix = '''
QDockWidget::title
{{
background-color: {color};
text-align: center;
height: 12px;
}}
'''.format(color=DarkPalette.COLOR_BACKGROUND_NORMAL)
# Only open the QSS file if any patch is needed
if os_fix:
_logger.info("Found OS patches to be applied.")
return os_fix
def _apply_application_patches(app: QApplication) -> None:
"""
Apply application level fixes on the QPalette.
The import names args must be passed here because the import is done
inside the load_stylesheet() function, as QtPy is only imported in
that moment for setting reasons.
"""
# See issue #139
color = DarkPalette.COLOR_SELECTION_LIGHT
qcolor = QColor(color)
_logger.info("Found application patches to be applied.")
if app:
palette = app.palette()
palette.setColor(QPalette.Normal, QPalette.Link, qcolor)
app.setPalette(palette)
else:
_logger.warning("No QCoreApplication instance found. "
"Application patches not applied. "
"You have to call load_stylesheet function after "
"instantiation of QApplication to take effect. ")
def apply_stylesheet(app: QApplication, additionalStyles: str = "") -> None:
"""
Load the stylesheet for use in a PyQt5 application.
Returns:
str: the stylesheet string.
"""
# Thus, by importing the binary we can access the resources
package_dir = os.path.basename(PACKAGE_PATH)
qss_rc_path = ":" + os.path.join(package_dir, QSS_FILE)
_logger.debug("Reading QSS file in: %s", qss_rc_path)
# It gets the qss file from compiled style_rc that was import
# not from the file QSS as we are using resources
qss_file = QFile(qss_rc_path)
stylesheet = ""
if qss_file.exists():
qss_file.open(QFile.ReadOnly | QFile.Text)
text_stream = QTextStream(qss_file)
stylesheet = text_stream.readAll()
_logger.info("QSS file sucessfuly loaded.")
else:
stylesheet = ""
raise FileNotFoundError("Unable to find QSS file '{}' resources.".format(qss_rc_path))
_logger.debug("Checking patches for being applied.")
stylesheet += _apply_os_patches()
if additionalStyles:
stylesheet += additionalStyles
_apply_application_patches(app)
app.setStyleSheet(stylesheet)
