saveOffset method Null safety
- double offset
override
Called by the ScrollPosition whenever scrolling ends to persist the
provided scroll offset
for state restoration purposes.
The ScrollContext may pass the value back to a ScrollPosition by calling ScrollPosition.restoreOffset at a later point in time or after the application has restarted to restore the scroll offset.
Implementation
@override
void saveOffset(double offset) {
assert(debugIsSerializableForRestoration(offset));
_persistedScrollOffset.value = offset;
// [saveOffset] is called after a scrolling ends and it is usually not
// followed by a frame. Therefore, manually flush restoration data.
ServicesBinding.instance.restorationManager.flushData();
}