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This is a complete (I think) dark color palette for the Qt 5 Fusion theme, as well as a nice style sheet for the tool tips that make them blend better with the rest of the theme. To have immediate effect, be sure to put this in your main function before showing the parent window. Child windows should automatically inherit the palette unless you …
qApp->setStyle(QStyleFactory::create("Fusion"));
QPalette darkPalette;
darkPalette.setColor(QPalette::Window, QColor(53,53,53));
darkPalette.setColor(QPalette::WindowText, Qt::white);
darkPalette.setColor(QPalette::Base, QColor(25,25,25));
darkPalette.setColor(QPalette::AlternateBase, QColor(53,53,53));
darkPalette.setColor(QPalette::ToolTipBase, Qt::white);
darkPalette.setColor(QPalette::ToolTipText, Qt::white);
darkPalette.setColor(QPalette::Text, Qt::white);
darkPalette.setColor(QPalette::Button, QColor(53,53,53));
darkPalette.setColor(QPalette::ButtonText, Qt::white);
darkPalette.setColor(QPalette::BrightText, Qt::red);
darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));
darkPalette.setColor(QPalette::Highlight, QColor(42, 130, 218));
darkPalette.setColor(QPalette::HighlightedText, Qt::black);
qApp->setPalette(darkPalette);
qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
@leplatrem
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leplatrem commented Mar 18, 2020

I had to fix appearance of disabled widgets:

    QColor darkGray(53, 53, 53);
    QColor gray(128, 128, 128);
    QColor black(25, 25, 25);
    QColor blue(42, 130, 218);

    QPalette darkPalette;
    darkPalette.setColor(QPalette::Window, darkGray);
    darkPalette.setColor(QPalette::WindowText, Qt::white);
    darkPalette.setColor(QPalette::Base, black);
    darkPalette.setColor(QPalette::AlternateBase, darkGray);
    darkPalette.setColor(QPalette::ToolTipBase, blue);
    darkPalette.setColor(QPalette::ToolTipText, Qt::white);
    darkPalette.setColor(QPalette::Text, Qt::white);
    darkPalette.setColor(QPalette::Button, darkGray);
    darkPalette.setColor(QPalette::ButtonText, Qt::white);
    darkPalette.setColor(QPalette::Link, blue);
    darkPalette.setColor(QPalette::Highlight, blue);
    darkPalette.setColor(QPalette::HighlightedText, Qt::black);

    darkPalette.setColor(QPalette::Active, QPalette::Button, gray.darker());
    darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);

@palucki
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palucki commented Apr 5, 2020

Thanks @leplatrem, @QuantumCD

I've used the style in my steganography app.
All the best to you guys!

@ZENALC
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ZENALC commented Feb 4, 2021

I had to fix appearance of disabled widgets:

    QColor darkGray(53, 53, 53);
    QColor gray(128, 128, 128);
    QColor black(25, 25, 25);
    QColor blue(42, 130, 218);

    QPalette darkPalette;
    darkPalette.setColor(QPalette::Window, darkGray);
    darkPalette.setColor(QPalette::WindowText, Qt::white);
    darkPalette.setColor(QPalette::Base, black);
    darkPalette.setColor(QPalette::AlternateBase, darkGray);
    darkPalette.setColor(QPalette::ToolTipBase, blue);
    darkPalette.setColor(QPalette::ToolTipText, Qt::white);
    darkPalette.setColor(QPalette::Text, Qt::white);
    darkPalette.setColor(QPalette::Button, darkGray);
    darkPalette.setColor(QPalette::ButtonText, Qt::white);
    darkPalette.setColor(QPalette::Link, blue);
    darkPalette.setColor(QPalette::Highlight, blue);
    darkPalette.setColor(QPalette::HighlightedText, Qt::black);

    darkPalette.setColor(QPalette::Active, QPalette::Button, gray.darker());
    darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
    darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);

Awesome thank you! For Python, use this:

palette.setColor(QPalette.Disabled, QPalette.Button, QColor(35, 35, 35))

@J-Kappes
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J-Kappes commented May 30, 2022

When I had floating docks using this I got white lines on the left edge.
Setting QPallete::Light to the same color as QPalette::Window fixed it.

darkPalette.setColor(QPalette::Light,QColor(53, 53, 53));

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