cxx-qt-gen: support for marking signals in the base class

[ahayzen-kdab]

Closes #286

[ahayzen-kdab]

Currently this uses

#[cxx_qt::signals(MyObject)]
enum Signal {
    #[existing_cxx_name="dataChanged"]
    DataChanged
}

But maybe instead the cxx_name and existing should be split ? and is inherit or cxx_inherit a better name as it matches the #363 macro ?

#[cxx_qt::signals(MyObject)]
enum Signal {
    #[cxx_name="dataChanged"] 
    #[inherit]
    DataChanged
}

If you just use inherit then it can do the normal case conversion, and if you use cxx_name by itself then you can choose a different name for C++ than Rust.

[ahayzen-kdab]

Currently this uses

#[cxx_qt::signals(MyObject)]
enum Signal {
    #[existing_cxx_name="dataChanged"]
    DataChanged
}

But maybe instead the cxx_name and existing should be split ? and is inherit or cxx_inherit a better name as it matches the #363 macro ?

#[cxx_qt::signals(MyObject)]
enum Signal {
    #[cxx_name="dataChanged"] 
    #[inherit]
    DataChanged
}

If you just use inherit then it can do the normal case conversion, and if you use cxx_name by itself then you can choose a different name for C++ than Rust.

Changed :-)

[Be-ing]

Looks good besides picking some more specific naming in the example.