align method
Determines the alignment of the appbar based on appbar position and scroll.
Implementation
@override
AppBarAlignmentCommand? align(
AppBarPosition appBar, NestedScrollPosition scroll) {
if (alignAnimation) {
return appBar.expandedPercent < 0.5
? AppBarAlignmentCommand.shrink
: AppBarAlignmentCommand.expand;
}
return null;
}