QtCreator problem?

[Willem Ferguson]

I am working with the subsurface project loaded into QtCreator. I 
created a new class, the files (.cpp, .h) of which exists in the 
directory: desktop-widgets. When I refer to this class from within the 
Subsurface C++ code, I get an error: "Undefined reference" to the 
constructor and method of the new class. Obviously the new class is 
instantiated inside the Subsurface code.

I notice two things:

a) Attached image shows QtCreator side bar with File system at the top 
and with the recognised classes below. As file manager, it sees the .cpp 
and .h files ("downloadmanager.cpp & downloadmanager.h) but the class 
does not appear in the class view panel below.

b) If I look in the Subsurface.cbp file, the new class has also not been 
added there after QtCreator initially created the .cbp file.

I am convinced this is something basic and simple that I have not 
managed to understand.
Kind regards,
willem


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