is Theme and OS detectable to python?

Grum999 · September 23, 2020, 7:38am

Hi

Yes, it’s possible… but not easy for my own experience.
I don’t know if the way I’ve implemented it is the best or not.
Maybe a simpler method exists, I don’t know, but it works.

In BuliCommander plugin, I need to load icon set according to theme (dark or light) and solution I found is to check current window background color defined by Qt.

Take a look on BCTheme class.
It detect if current theme is Dark or Light, and allow to return a dictionary of stylesheet according to current theme.

github.com

Grum999/BuliCommander/blob/master/bulicommander/bulicommander/bc/bctheme.py

#-----------------------------------------------------------------------------
# Buli Commander
# Copyright (C) 2020 - Grum999
# -----------------------------------------------------------------------------
# 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/
# -----------------------------------------------------------------------------
# A Krita plugin designed to manage documents
# -----------------------------------------------------------------------------

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Concerning resources (icons), it’s more tricky.

You need to prepare resource files:

Create SVG files for dark/black
Use the QtDesigner to generate resource file (.qrc), one for Dark theme, on for Light theme (or build it manually if you prefer, QRC file is just an XML file)
Convert the .qcc file to .rcc file (use Qt rcc command line tool)

So now, you have resource files, you need to load them…
The loadResources() method from the BCTheme does it.

Not yet implemented in my plugin, but I need to detect when the theme is changed to reload resource dynamically (currently, theme is properly applied only when plugin is initialised and if theme is modified in Krita, user have to restart Krita to have theme properly applied in plugin)
The signal void Window::themeChanged() might be helpfull for this.

For OS detection, I use sys.platform value, but I think there’s many other way to do it…

Grum999