QML and Qt Quick controls allow a very rapid development also mainly for mobile devices. However mobile devices require some additional code for manage special system buttons. In this post we discuss about how to manage the Android back button using QML.
QNetworkAccessManager is the Qt component for make network connection. The use of this component is quite easy and you can use for basic operation like download files or web pages. Experimenting the use you'll note it work very well with standard network connection but, especially under Windows, doesn't work with SSL connection (like 'https' for example).
Convert a SVG image to QPixmap format is a very easy operation using the Qt classes. Common examples that is possible to find into documentation, however, refer to a situation where the screen device have standard pixel ratio of 1.
If you want to develop a custom Qt widget to distrbute or sell a good habits is always to develop, in addition, a plugin working into Qt Designer allowing to visually use and configure your custom widget inside the designer GUI editor. Develop such plugin is not a difficult task, official documentation and examples are here and, as usual for Qt, all is well explained.