There should be a QtCreator Refactor/"Quick Fix" to generate the boilerplate code for typical Q_PROPERTY usage. When right clicking on a [private] data member variable in QtCreator, we should offer 2 new refactor options:

//ex: right-clicking on m_X
int m_X;

Option 1) Declare Q_PROPERTY + NOTIFY Signal
results in:

   Q_PROPERTY(int x MEMBER m_X NOTIFY xChanged)
   protected:
       void xChanged(int newX);

Option 2) Declare Q_PROPERTY
results in:

  Q_PROPERTY(int x MEMBER m_X)