scrollable_of_test.dart
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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:sheet/sheet.dart';
class ScrollPositionListener extends StatefulWidget {
const ScrollPositionListener(
{super.key, required this.child, required this.log});
final Widget child;
final ValueChanged<String> log;
@override
State<ScrollPositionListener> createState() => _ScrollPositionListenerState();
}
class _ScrollPositionListenerState extends State<ScrollPositionListener> {
ScrollPosition? _position;
@override
void didChangeDependencies() {
super.didChangeDependencies();
_position?.removeListener(listener);
_position = SheetScrollable.of(context)?.position;
_position?.addListener(listener);
widget.log('didChangeDependencies ${_position?.pixels.toStringAsFixed(1)}');
}
@override
void dispose() {
_position?.removeListener(listener);
super.dispose();
}
@override
Widget build(BuildContext context) => widget.child;
void listener() {
widget.log('listener ${_position?.pixels.toStringAsFixed(1)}');
}
}
void main() {
testWidgets(
'SheetScrollable.of() dependent rebuilds when SheetScrollable position changes',
(WidgetTester tester) async {
late String logValue;
final SheetController controller = SheetController();
// Changing the SingleChildScrollView's physics causes the
// ScrollController's ScrollPosition to be rebuilt.
Widget buildFrame(SheetPhysics? physics) {
return MaterialApp(
home: Sheet(
controller: controller,
physics: physics,
child: ScrollPositionListener(
log: (String s) {
logValue = s;
},
child: const SizedBox(height: 400.0),
),
),
);
}
await tester.pumpWidget(buildFrame(null));
expect(logValue, 'didChangeDependencies 0.0');
controller.jumpTo(100.0);
expect(logValue, 'listener 100.0');
await tester.pumpWidget(buildFrame(const AlwaysDraggableSheetPhysics()));
expect(logValue, 'didChangeDependencies 100.0');
controller.jumpTo(200.0);
expect(logValue, 'listener 200.0');
controller.jumpTo(300.0);
expect(logValue, 'listener 300.0');
await tester
.pumpWidget(buildFrame(const SnapSheetPhysics(stops: <double>[0, 1])));
expect(logValue, 'didChangeDependencies 300.0');
controller.jumpTo(400.0);
expect(logValue, 'listener 400.0');
});
}