Qt_app_theme

Sample app that gives us some idea to deal with app theme for qt/qml projects.

1. ThemeManager - a singleton class to manage the app theme.
2. Backend - Bridge between qml and Qt classes.
3. At the runtime based on the user input QObject has been invoked and assigned as the ContextProperty so that all qml can have the access to the same obj.

Important Note: Theme has to be set before the QmlEngine loads the main.qml i.e.: ThemeManager::getInstance()->initTheme(&engine); has to be called before engine.load(QUrl(QStringLiteral("qrc:/qml/main.qml"))); call.

Pre requisites: Qt version > 5.5.1