SliverAnimatedBoxMetrics constructor
SliverAnimatedBoxMetrics({})
Creates the metrics for a SliverAnimatedBoxWidgetBuilder.
Implementation
SliverAnimatedBoxMetrics({
required this.scrollExtent,
required this.scrollOffset,
required this.viewportExtent,
this.previousBoxExtent,
}) : assert(scrollExtent > 0),
assert(scrollOffset >= 0),
assert(viewportExtent >= 0),
assert(previousBoxExtent == null || previousBoxExtent >= 0),
assert(previousBoxExtent == null || previousBoxExtent <= scrollExtent);