Where to find Delegate event description (onKey and onTap)

Hey,

where do i find the documentation for events handled by the Delegate-class?

I want to handle onTap depending on the touch coordinates as well as the onKey depending on the key.

In the debugger i see the mX, mY (mKey for onKey) but accessing in results in an error:

Error: Symbol Not Found Error
Details: Could not find symbol 'mY'

I tought i searched on the web, but it seems i miss a documentation here...

Kind regards,

Sebastian