extentBefore property
The quantity of content conceptually "above" the viewport in the scrollable. This is the content above the content described by extentInside.
Implementation
double get extentBefore => math.max(pixels - minScrollExtent, 0.0);The quantity of content conceptually "above" the viewport in the scrollable. This is the content above the content described by extentInside.
double get extentBefore => math.max(pixels - minScrollExtent, 0.0);