onDocumentScrolled
Called whenever the document in the fragment scrolled. Values are expressed in an arbitrary unit and may change with every call. Also maxX and maxY are not guaranteed to remain the same between two calls.
Parameters
currX
Current scroll amount X.
currY
Current scroll amount Y.
maxX
Maximum scroll amount of the X dimension.
maxY
Maximum scroll amount of the Y dimension.
extendX
Extend of the visible content in the X dimension.
extendY
Extend of the visible content in the Y dimension.