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SliverAppBar Default Elevation Patch (#73526)

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Nathan Walker 2021-02-22 16:56:03 -08:00 committed by GitHub
parent 17c5c4c33a
commit 01b7ada7c1
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2 changed files with 59 additions and 10 deletions
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2
packages/flutter/lib/src/material/app_bar.dart
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@ -1154,7 +1154,7 @@ class _SliverAppBarDelegate extends SliverPersistentHeaderDelegate {
? Semantics(child: flexibleSpace, header: true)
: flexibleSpace,
bottom: bottom,
elevation: forceElevated || overlapsContent || (pinned && shrinkOffset > maxExtent - minExtent) ? elevation ?? 4.0 : 0.0,
elevation: forceElevated || overlapsContent || (pinned && shrinkOffset > maxExtent - minExtent) ? elevation : 0.0,
shadowColor: shadowColor,
backgroundColor: backgroundColor,
foregroundColor: foregroundColor,

63
packages/flutter/test/material/app_bar_test.dart
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@ -903,30 +903,79 @@ void main() {
expect(tabBarHeight(tester), initialTabBarHeight);
});
testWidgets('SliverAppBar rebuilds when forceElevated changes', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/59158.
Widget buildSliverAppBar(bool forceElevated) {
testWidgets('AppBar uses the specified elevation or defaults to 4.0', (WidgetTester tester) async {
Widget buildAppBar([double? elevation]) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Title'), elevation: elevation),
),
);
}
Material getMaterial() => tester.widget<Material>(find.descendant(
of: find.byType(AppBar),
matching: find.byType(Material),
));
// Default elevation should be _AppBarState._defaultElevation = 4.0
await tester.pumpWidget(buildAppBar());
expect(getMaterial().elevation, 4.0);
// AppBar should use the specified elevation.
await tester.pumpWidget(buildAppBar(8.0));
expect(getMaterial().elevation, 8.0);
});
group('SliverAppBar elevation', () {
Widget buildSliverAppBar(bool forceElevated, {double? elevation, double? themeElevation}) {
return MaterialApp(
theme: ThemeData(appBarTheme: AppBarTheme(elevation: themeElevation)),
home: CustomScrollView(
slivers: <Widget>[
SliverAppBar(
backwardsCompatibility: false,
title: const Text('Title'),
forceElevated: forceElevated,
elevation: elevation,
),
],
),
);
}
final Finder appBarFinder = find.byType(AppBar);
AppBar getAppBarWidget(Finder finder) => tester.widget<AppBar>(finder);
testWidgets('Respects forceElevated parameter', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/59158.
AppBar getAppBar() => tester.widget<AppBar>(find.byType(AppBar));
Material getMaterial() => tester.widget<Material>(find.byType(Material));
// When forceElevated is off, SliverAppBar should not be elevated.
await tester.pumpWidget(buildSliverAppBar(false));
expect(getAppBarWidget(appBarFinder).elevation, 0.0);
expect(getMaterial().elevation, 0.0);
// Default elevation should be _AppBarState._defaultElevation = 4.0, and
// the AppBar's elevation should not be specified by SliverAppBar.
await tester.pumpWidget(buildSliverAppBar(true));
expect(getAppBarWidget(appBarFinder).elevation, 4.0);
expect(getMaterial().elevation, 4.0);
expect(getAppBar().elevation, null);
// SliverAppBar should use the specified elevation.
await tester.pumpWidget(buildSliverAppBar(true, elevation: 8.0));
expect(getMaterial().elevation, 8.0);
});
testWidgets('Uses elevation of AppBarTheme by default', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/73525.
Material getMaterial() => tester.widget<Material>(find.byType(Material));
await tester.pumpWidget(buildSliverAppBar(false, themeElevation: 12.0));
expect(getMaterial().elevation, 0.0);
await tester.pumpWidget(buildSliverAppBar(true, themeElevation: 12.0));
expect(getMaterial().elevation, 12.0);
await tester.pumpWidget(buildSliverAppBar(true, elevation: 8.0, themeElevation: 12.0));
expect(getMaterial().elevation, 8.0);
});
});
testWidgets('AppBar dimensions, with and without bottom, primary', (WidgetTester tester) async {