Strange //! comment syntax in Quick Controls 2.0 QML source [duplicate]

Answer 1

There used to be example code snippets on the Customizing Qt Quick Controls documentation page, that were automatically extracted from our own QML code with help of those qdoc-markers.

Answer 2

With Qt comments that begin with ! are parsed to generate documentation. That applies to single and multi line comments.

In this particular case however it doesn't seem to contain any actual documentation, it is used to signify the lines where individual implementation details begin and end.

You can learn more about the documentation format here.