computeMaxScrollOffset method
- @protected
@protected
Called to obtain a precise measure of the total scrollable extents of this object.
Must return the precise total distance from the start of the child with the earliest possible index to the end of the child with the last possible index.
This is used when no child is available for the index corresponding to the current scroll offset, to determine the precise dimensions of the sliver. It must return a precise value. It will not be called if the childManager returns an infinite number of children for positive indices.
By default, multiplies the itemExtent by the number of children reported
by RenderSliverBoxChildManager.childCount.
See also:
- estimateMaxScrollOffset, which is similar but may provide inaccurate values.
Implementation
@protected
double computeMaxScrollOffset(SliverConstraints constraints, double itemExtent) {
return childManager.childCount * itemExtent;
}