Long time follower, but for a strange reason - enaml is by far the only Qt product that has docking done right - e.g. one can undock windows into floating ones, and dock again into them (plus other nifty features). I've gave a week shot of trying to make a C++ version of your code, but failed miserably (due to lack of Python understanding, and under pressure to see whether it can be done under a week).

I wish your docking area was part of Qt4/5, and other products would benefit from it too - like Autodesk Maya, MotionBuilder, and many others.

Thank you!