[dunhill]

Originally Posted by thiago.eec

Did you tried what I suggested via PM? Here is with a detailed explanation (Python 3):

First, put your suffixed icons in the 'images' folder inside your plugin zip file. E.g.: 'images/icon_dark.png', 'images/icon_light.png'.

Place this at the start of your main.py or similar:

# Check for dark theme
def is_dark_theme():
    return QApplication.instance().is_dark_theme

Then, the get_icon() function:

def get_icon(icon_name):
    icon_name = 'images/' + icon_name

    # Choose the suffix
    tc = 'dark' if is_dark_theme() else 'light'
    sq, ext = os.path.splitext(icon_name)
    sq = f'{sq}_{tc}{ext}'

    return get_icons(sq)

Then, in your code, use the get_icon() function to retrieve the icon like this:

icon = get_icon(icon_name.png)

Note that you use the icon name without the suffix (dark/light).

This will allow the plugin to change from light/dark theme when calibre starts. If you want it to change without restarting, than you need to rebuild the menus on the fly. Check out the rebuild_menus() method present in many plugins (ui.py).

Now, thank you very much.