sp-color-selector.h/cpp

sp-color-wheel-selector.h/cpp

sp-color-scales.h/cpp

I also tried using the SP_IS_COLOR_WHEEL_SELECTOR(o) but I couldn't figure out how to design the final function call that takes as the argument, the list of selected objects when the wheel is actively being used (in the sp-color-notebook) and then changes the colors of the individual objects. 

This is what is holding me back: Where to put the function ? As a member of ColorSelector ? ColorWheelSelector ? or PaintSelector ?
Please help. 

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