Theme Engine in Qt C++ | Media Player Project Tutorial – Part 3a

Welcome back to the Ultimate Qt + C++ Media Player Tutorial Series!

In this episode, we build a powerful runtime Theme Manager that allows you to change the entire look and feel of your media player app using simple, clean JSON files, all handled in C++. This means no more hardcoded colors or manual style changes across your UI, your app becomes dynamic, scalable, and designer-friendly.

Whether you're aiming for a dark mode, a blue variant, or even full rebranding, this centralized Theme Engine will let you switch instantly, and even support full theming in QML.

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🔍 What You'll Learn in This Part:
🔹 How to load a JSON-based theme using QFile and QJsonDocument
🔹 Flattening deeply nested JSON (colors.primary.background) into easy-to use keys
🔹 Making your UI scalable and theme-aware from Day 1
🔹 Building the foundation for runtime theme switching

This is a must-have module if you want your Qt app to support runtime theming, dark/light modes, or future customization.

📦 GitHub Source Code (Media Player Project):
🔗 https://github.com/kaustuvpokharel/LU...

🎮 Game Dev Qt Playlist:
   • Game with QT C++  

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  / kaustuvpokharel  

#Qt #C++ #VideoPlayer #ThemeManager #RuntimeTheming #QML #CMake #CppDesign #MediaPlayer #DynamicStyling #json #tutorialseries #kali