Not sure if I got your question properly, is this what you are trying to achieve?
Screenshot:
Code:
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
// Height of your Container
static final _containerHeight = 100.0;
// You don't need to change any of these variables
var _fromTop = -_containerHeight;
var _controller = ScrollController();
var _allowReverse = true, _allowForward = true;
var _prevOffset = 0.0;
var _prevForwardOffset = -_containerHeight;
var _prevReverseOffset = 0.0;
@override
void initState() {
super.initState();
_controller.addListener(_listener);
}
// entire logic is inside this listener for ListView
void _listener() {
double offset = _controller.offset;
var direction = _controller.position.userScrollDirection;
if (direction == ScrollDirection.reverse) {
_allowForward = true;
if (_allowReverse) {
_allowReverse = false;
_prevOffset = offset;
_prevForwardOffset = _fromTop;
}
var difference = offset - _prevOffset;
_fromTop = _prevForwardOffset + difference;
if (_fromTop > 0) _fromTop = 0;
} else if (direction == ScrollDirection.forward) {
_allowReverse = true;
if (_allowForward) {
_allowForward = false;
_prevOffset = offset;
_prevReverseOffset = _fromTop;
}
var difference = offset - _prevOffset;
_fromTop = _prevReverseOffset + difference;
if (_fromTop < -_containerHeight) _fromTop = -_containerHeight;
}
setState(() {}); // for simplicity I'm calling setState here, you can put bool values to only call setState when there is a genuine change in _fromTop
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("ListView")),
body: Stack(
children: <Widget>[
_yourListView(),
Positioned(
top: _fromTop,
left: 0,
right: 0,
child: _yourContainer(),
)
],
),
);
}
Widget _yourListView() {
return ListView.builder(
itemCount: 100,
controller: _controller,
itemBuilder: (_, index) => ListTile(title: Text("Item $index")),
);
}
Widget _yourContainer() {
return Opacity(
opacity: 1 - (-_fromTop / _containerHeight),
child: Container(
height: _containerHeight,
color: Colors.red,
alignment: Alignment.center,
child: Text("Your Container", style: TextStyle(fontSize: 32, fontWeight: FontWeight.bold, color: Colors.white)),
),
);
}
}
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