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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.
// This file is run as part of a reduced test set in CI on Mac and Windows
// machines.
@Tags(<String>['reduced-test-set'])
library;
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
final Key blockKey = UniqueKey();
const double expandedAppbarHeight = 250.0;
final Key finderKey = UniqueKey();
void main() {
testWidgets('FlexibleSpaceBar stretch mode default zoomBackground', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: CustomScrollView(
physics: const BouncingScrollPhysics(),
key: blockKey,
slivers: <Widget>[
SliverAppBar(
expandedHeight: expandedAppbarHeight,
pinned: true,
stretch: true,
flexibleSpace: FlexibleSpaceBar(
background: Container(
key: finderKey,
),
),
),
SliverToBoxAdapter(child: Container(height: 10000.0)),
],
),
),
),
);
// Scrolling up into the overscroll area causes the appBar to expand in size.
// This overscroll effect enlarges the background in step with the appbar.
final Finder appbarContainer = find.byKey(finderKey);
final Size sizeBeforeScroll = tester.getSize(appbarContainer);
await slowDrag(tester, blockKey, const Offset(0.0, 100.0));
final Size sizeAfterScroll = tester.getSize(appbarContainer);
expect(sizeBeforeScroll.height, lessThan(sizeAfterScroll.height));
});
testWidgets('FlexibleSpaceBar stretch mode blurBackground', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(useMaterial3: false),
home: Scaffold(
body: CustomScrollView(
physics: const BouncingScrollPhysics(),
key: blockKey,
slivers: <Widget>[
SliverAppBar(
expandedHeight: expandedAppbarHeight,
pinned: true,
stretch: true,
flexibleSpace: RepaintBoundary(
child: FlexibleSpaceBar(
stretchModes: const <StretchMode>[StretchMode.blurBackground],
background: Row(
children: <Widget>[
Expanded(child: Container(color: Colors.red)),
Expanded(child:Container(color: Colors.blue)),
],
),
),
),
),
SliverToBoxAdapter(child: Container(height: 10000.0)),
],
),
),
),
);
// Scrolling up into the overscroll area causes the background to blur.
await slowDrag(tester, blockKey, const Offset(0.0, 100.0));
await expectLater(
find.byType(FlexibleSpaceBar),
matchesGoldenFile('flexible_space_bar_stretch_mode.blur_background.png'),
);
});
testWidgets('FlexibleSpaceBar stretch mode fadeTitle', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: CustomScrollView(
physics: const BouncingScrollPhysics(),
key: blockKey,
slivers: <Widget>[
SliverAppBar(
expandedHeight: expandedAppbarHeight,
pinned: true,
stretch: true,
flexibleSpace: FlexibleSpaceBar(
stretchModes: const <StretchMode>[StretchMode.fadeTitle],
title: Text(
'Title',
key: finderKey,
),
),
),
SliverToBoxAdapter(child: Container(height: 10000.0)),
],
),
),
),
);
await slowDrag(tester, blockKey, const Offset(0.0, 10.0));
Opacity opacityWidget = tester.widget<Opacity>(
find.ancestor(
of: find.text('Title'),
matching: find.byType(Opacity),
).first,
);
expect(opacityWidget.opacity.round(), equals(1));
await slowDrag(tester, blockKey, const Offset(0.0, 100.0));
opacityWidget = tester.widget<Opacity>(
find.ancestor(
of: find.text('Title'),
matching: find.byType(Opacity),
).first,
);
expect(opacityWidget.opacity, equals(0.0));
});
testWidgets('FlexibleSpaceBar stretch mode ignored for non-overscroll physics', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: CustomScrollView(
physics: const ClampingScrollPhysics(),
key: blockKey,
slivers: <Widget>[
SliverAppBar(
expandedHeight: expandedAppbarHeight,
stretch: true,
pinned: true,
flexibleSpace: FlexibleSpaceBar(
stretchModes: const <StretchMode>[StretchMode.blurBackground],
background: Container(
key: finderKey,
),
),
),
SliverToBoxAdapter(child: Container(height: 10000.0)),
],
),
),
),
);
final Finder appbarContainer = find.byKey(finderKey);
final Size sizeBeforeScroll = tester.getSize(appbarContainer);
await slowDrag(tester, blockKey, const Offset(0.0, 100.0));
final Size sizeAfterScroll = tester.getSize(appbarContainer);
expect(sizeBeforeScroll.height, equals(sizeAfterScroll.height));
});
}
Future<void> slowDrag(WidgetTester tester, Key widget, Offset offset) async {
final Offset target = tester.getCenter(find.byKey(widget));
final TestGesture gesture = await tester.startGesture(target);
await gesture.moveBy(offset);
await tester.pump(const Duration(milliseconds: 10));
await gesture.up();
}