Refactoring for CCBGLView: * Split up performDragOperation method in different case methods * Some code formatting harmonizing * Extracted a helper method, remove code duplication * Modern syntax for arrays and dictionaries applied
Refactoring for CCBGLView:
* Split up performDragOperation method in different case methods
* Some code formatting harmonizing
* Extracted a helper method, remove code duplication
* Modern syntax for arrays and dictionaries applied

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