738 lines
24 KiB
Dart
738 lines
24 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('LayoutBuilder parent size', (WidgetTester tester) async {
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late Size layoutBuilderSize;
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final Key childKey = UniqueKey();
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final Key parentKey = UniqueKey();
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await tester.pumpWidget(
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Center(
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child: ConstrainedBox(
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constraints: const BoxConstraints(maxWidth: 100.0, maxHeight: 200.0),
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child: LayoutBuilder(
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key: parentKey,
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builder: (BuildContext context, BoxConstraints constraints) {
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layoutBuilderSize = constraints.biggest;
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return SizedBox(
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key: childKey,
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width: layoutBuilderSize.width / 2.0,
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height: layoutBuilderSize.height / 2.0,
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);
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},
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),
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),
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),
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);
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expect(layoutBuilderSize, const Size(100.0, 200.0));
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final RenderBox parentBox = tester.renderObject(find.byKey(parentKey));
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expect(parentBox.size, equals(const Size(50.0, 100.0)));
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final RenderBox childBox = tester.renderObject(find.byKey(childKey));
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expect(childBox.size, equals(const Size(50.0, 100.0)));
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});
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testWidgets('SliverLayoutBuilder parent geometry', (WidgetTester tester) async {
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late SliverConstraints parentConstraints1;
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late SliverConstraints parentConstraints2;
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final Key childKey1 = UniqueKey();
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final Key parentKey1 = UniqueKey();
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final Key childKey2 = UniqueKey();
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final Key parentKey2 = UniqueKey();
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: CustomScrollView(
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slivers: <Widget>[
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SliverLayoutBuilder(
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key: parentKey1,
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builder: (BuildContext context, SliverConstraints constraint) {
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parentConstraints1 = constraint;
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return SliverPadding(key: childKey1, padding: const EdgeInsets.fromLTRB(1, 2, 3, 4));
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},
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),
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SliverLayoutBuilder(
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key: parentKey2,
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builder: (BuildContext context, SliverConstraints constraint) {
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parentConstraints2 = constraint;
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return SliverPadding(key: childKey2, padding: const EdgeInsets.fromLTRB(5, 7, 11, 13));
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},
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),
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],
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),
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),
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);
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expect(parentConstraints1.crossAxisExtent, 800);
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expect(parentConstraints1.remainingPaintExtent, 600);
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expect(parentConstraints2.crossAxisExtent, 800);
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expect(parentConstraints2.remainingPaintExtent, 600 - 2 - 4);
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final RenderSliver parentSliver1 = tester.renderObject(find.byKey(parentKey1));
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final RenderSliver parentSliver2 = tester.renderObject(find.byKey(parentKey2));
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// scrollExtent == top + bottom.
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expect(parentSliver1.geometry!.scrollExtent, 2 + 4);
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expect(parentSliver2.geometry!.scrollExtent, 7 + 13);
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final RenderSliver childSliver1 = tester.renderObject(find.byKey(childKey1));
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final RenderSliver childSliver2 = tester.renderObject(find.byKey(childKey2));
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expect(childSliver1.geometry, parentSliver1.geometry);
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expect(childSliver2.geometry, parentSliver2.geometry);
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});
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testWidgets('LayoutBuilder stateful child', (WidgetTester tester) async {
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late Size layoutBuilderSize;
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late StateSetter setState;
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final Key childKey = UniqueKey();
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final Key parentKey = UniqueKey();
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double childWidth = 10.0;
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double childHeight = 20.0;
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await tester.pumpWidget(
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Center(
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child: LayoutBuilder(
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key: parentKey,
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builder: (BuildContext context, BoxConstraints constraints) {
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layoutBuilderSize = constraints.biggest;
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return StatefulBuilder(
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builder: (BuildContext context, StateSetter setter) {
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setState = setter;
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return SizedBox(
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key: childKey,
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width: childWidth,
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height: childHeight,
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);
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},
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);
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},
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),
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),
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);
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expect(layoutBuilderSize, equals(const Size(800.0, 600.0)));
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RenderBox parentBox = tester.renderObject(find.byKey(parentKey));
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expect(parentBox.size, equals(const Size(10.0, 20.0)));
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RenderBox childBox = tester.renderObject(find.byKey(childKey));
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expect(childBox.size, equals(const Size(10.0, 20.0)));
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setState(() {
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childWidth = 100.0;
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childHeight = 200.0;
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});
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await tester.pump();
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parentBox = tester.renderObject(find.byKey(parentKey));
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expect(parentBox.size, equals(const Size(100.0, 200.0)));
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childBox = tester.renderObject(find.byKey(childKey));
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expect(childBox.size, equals(const Size(100.0, 200.0)));
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});
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testWidgets('SliverLayoutBuilder stateful descendants', (WidgetTester tester) async {
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late StateSetter setState;
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double childWidth = 10.0;
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double childHeight = 20.0;
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final Key parentKey = UniqueKey();
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final Key childKey = UniqueKey();
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: CustomScrollView(
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slivers: <Widget>[
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SliverLayoutBuilder(
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key: parentKey,
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builder: (BuildContext context, SliverConstraints constraint) {
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return SliverToBoxAdapter(
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child: StatefulBuilder(
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builder: (BuildContext context, StateSetter setter) {
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setState = setter;
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return SizedBox(
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key: childKey,
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width: childWidth,
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height: childHeight,
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);
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},
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),
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);
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},
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),
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],
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),
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),
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);
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RenderBox childBox = tester.renderObject(find.byKey(childKey));
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RenderSliver parentSliver = tester.renderObject(find.byKey(parentKey));
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expect(childBox.size.width, 800);
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expect(childBox.size.height, childHeight);
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expect(parentSliver.geometry!.scrollExtent, childHeight);
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expect(parentSliver.geometry!.paintExtent, childHeight);
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setState(() {
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childWidth = 100.0;
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childHeight = 200.0;
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});
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await tester.pump();
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childBox = tester.renderObject(find.byKey(childKey));
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parentSliver = tester.renderObject(find.byKey(parentKey));
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expect(childBox.size.width, 800);
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expect(childBox.size.height, childHeight);
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expect(parentSliver.geometry!.scrollExtent, childHeight);
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expect(parentSliver.geometry!.paintExtent, childHeight);
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// Make child wider and higher than the viewport.
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setState(() {
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childWidth = 900.0;
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childHeight = 900.0;
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});
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await tester.pump();
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childBox = tester.renderObject(find.byKey(childKey));
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parentSliver = tester.renderObject(find.byKey(parentKey));
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expect(childBox.size.width, 800);
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expect(childBox.size.height, childHeight);
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expect(parentSliver.geometry!.scrollExtent, childHeight);
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expect(parentSliver.geometry!.paintExtent, 600);
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});
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testWidgets('LayoutBuilder stateful parent', (WidgetTester tester) async {
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late Size layoutBuilderSize;
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late StateSetter setState;
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final Key childKey = UniqueKey();
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double childWidth = 10.0;
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double childHeight = 20.0;
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await tester.pumpWidget(
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Center(
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child: StatefulBuilder(
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builder: (BuildContext context, StateSetter setter) {
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setState = setter;
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return SizedBox(
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width: childWidth,
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height: childHeight,
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child: LayoutBuilder(
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builder: (BuildContext context, BoxConstraints constraints) {
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layoutBuilderSize = constraints.biggest;
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return SizedBox(
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key: childKey,
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width: layoutBuilderSize.width,
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height: layoutBuilderSize.height,
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);
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},
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),
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);
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},
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),
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),
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);
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expect(layoutBuilderSize, equals(const Size(10.0, 20.0)));
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RenderBox box = tester.renderObject(find.byKey(childKey));
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expect(box.size, equals(const Size(10.0, 20.0)));
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setState(() {
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childWidth = 100.0;
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childHeight = 200.0;
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});
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await tester.pump();
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box = tester.renderObject(find.byKey(childKey));
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expect(box.size, equals(const Size(100.0, 200.0)));
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});
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testWidgets('LayoutBuilder and Inherited -- do not rebuild when not using inherited', (WidgetTester tester) async {
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int built = 0;
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final Widget target = LayoutBuilder(
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builder: (BuildContext context, BoxConstraints constraints) {
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built += 1;
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return Container();
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},
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);
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expect(built, 0);
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await tester.pumpWidget(MediaQuery(
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data: const MediaQueryData(size: Size(400.0, 300.0)),
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child: target,
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));
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expect(built, 1);
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await tester.pumpWidget(MediaQuery(
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data: const MediaQueryData(size: Size(300.0, 400.0)),
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child: target,
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));
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expect(built, 1);
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});
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testWidgets('LayoutBuilder and Inherited -- do rebuild when using inherited', (WidgetTester tester) async {
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int built = 0;
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final Widget target = LayoutBuilder(
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builder: (BuildContext context, BoxConstraints constraints) {
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built += 1;
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MediaQuery.of(context);
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return Container();
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},
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);
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expect(built, 0);
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await tester.pumpWidget(MediaQuery(
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data: const MediaQueryData(size: Size(400.0, 300.0)),
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child: target,
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));
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expect(built, 1);
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await tester.pumpWidget(MediaQuery(
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data: const MediaQueryData(size: Size(300.0, 400.0)),
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child: target,
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));
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expect(built, 2);
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});
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testWidgets('SliverLayoutBuilder and Inherited -- do not rebuild when not using inherited', (WidgetTester tester) async {
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int built = 0;
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final Widget target = Directionality(
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textDirection: TextDirection.ltr,
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child: CustomScrollView(
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slivers: <Widget>[
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SliverLayoutBuilder(
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builder: (BuildContext context, SliverConstraints constraint) {
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built++;
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return SliverToBoxAdapter(child: Container());
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},
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),
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],
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),
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);
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expect(built, 0);
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await tester.pumpWidget(MediaQuery(
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data: const MediaQueryData(size: Size(400.0, 300.0)),
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child: target,
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));
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expect(built, 1);
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await tester.pumpWidget(MediaQuery(
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data: const MediaQueryData(size: Size(300.0, 400.0)),
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child: target,
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));
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expect(built, 1);
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});
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testWidgets(
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'SliverLayoutBuilder and Inherited -- do rebuild when not using inherited',
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(WidgetTester tester) async {
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int built = 0;
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final Widget target = Directionality(
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textDirection: TextDirection.ltr,
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child: CustomScrollView(
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slivers: <Widget>[
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SliverLayoutBuilder(
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builder: (BuildContext context, SliverConstraints constraint) {
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built++;
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MediaQuery.of(context);
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return SliverToBoxAdapter(child: Container());
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},
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),
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],
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),
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);
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expect(built, 0);
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await tester.pumpWidget(MediaQuery(
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data: const MediaQueryData(size: Size(400.0, 300.0)),
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child: target,
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));
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expect(built, 1);
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await tester.pumpWidget(MediaQuery(
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data: const MediaQueryData(size: Size(300.0, 400.0)),
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child: target,
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));
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expect(built, 2);
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},
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);
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testWidgets('nested SliverLayoutBuilder', (WidgetTester tester) async {
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late SliverConstraints parentConstraints1;
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late SliverConstraints parentConstraints2;
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final Key childKey = UniqueKey();
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final Key parentKey1 = UniqueKey();
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final Key parentKey2 = UniqueKey();
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: CustomScrollView(
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slivers: <Widget>[
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SliverLayoutBuilder(
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key: parentKey1,
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builder: (BuildContext context, SliverConstraints constraint) {
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parentConstraints1 = constraint;
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return SliverLayoutBuilder(
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key: parentKey2,
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builder: (BuildContext context, SliverConstraints constraint) {
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parentConstraints2 = constraint;
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return SliverPadding(key: childKey, padding: const EdgeInsets.fromLTRB(1, 2, 3, 4));
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},
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);
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},
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),
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],
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),
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),
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);
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expect(parentConstraints1, parentConstraints2);
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expect(parentConstraints1.crossAxisExtent, 800);
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expect(parentConstraints1.remainingPaintExtent, 600);
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final RenderSliver parentSliver1 = tester.renderObject(find.byKey(parentKey1));
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final RenderSliver parentSliver2 = tester.renderObject(find.byKey(parentKey2));
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// scrollExtent == top + bottom.
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expect(parentSliver1.geometry!.scrollExtent, 2 + 4);
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final RenderSliver childSliver = tester.renderObject(find.byKey(childKey));
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expect(childSliver.geometry, parentSliver1.geometry);
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expect(parentSliver1.geometry, parentSliver2.geometry);
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});
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testWidgets('localToGlobal works with SliverLayoutBuilder', (WidgetTester tester) async {
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final Key childKey1 = UniqueKey();
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final Key childKey2 = UniqueKey();
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final ScrollController scrollController = ScrollController();
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: CustomScrollView(
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controller: scrollController,
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slivers: <Widget>[
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const SliverToBoxAdapter(
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child: SizedBox(height: 300),
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),
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SliverLayoutBuilder(
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builder: (BuildContext context, SliverConstraints constraint) => SliverToBoxAdapter(
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child: SizedBox(key: childKey1, height: 200),
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),
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),
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SliverToBoxAdapter(
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child: SizedBox(key: childKey2, height: 100),
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),
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],
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),
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),
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);
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final RenderBox renderChild1 = tester.renderObject(find.byKey(childKey1));
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final RenderBox renderChild2 = tester.renderObject(find.byKey(childKey2));
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// Test with scrollController.scrollOffset = 0.
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expect(
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renderChild1.localToGlobal(const Offset(100, 100)),
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const Offset(100, 300.0 + 100),
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);
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expect(
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renderChild2.localToGlobal(const Offset(100, 100)),
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const Offset(100, 300.0 + 200 + 100),
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);
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scrollController.jumpTo(100);
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await tester.pump();
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expect(
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renderChild1.localToGlobal(const Offset(100, 100)),
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// -100 because the scroll offset is now 100.
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const Offset(100, 300.0 + 100 - 100),
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);
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expect(
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renderChild2.localToGlobal(const Offset(100, 100)),
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// -100 because the scroll offset is now 100.
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const Offset(100, 300.0 + 100 + 200 - 100),
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);
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});
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testWidgets('hitTest works within SliverLayoutBuilder', (WidgetTester tester) async {
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final ScrollController scrollController = ScrollController();
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List<int> hitCounts = <int> [0, 0, 0];
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: Padding(
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padding: const EdgeInsets.all(50),
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child: CustomScrollView(
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controller: scrollController,
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slivers: <Widget>[
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SliverToBoxAdapter(
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child: SizedBox(
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height: 200,
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child: GestureDetector(onTap: () => hitCounts[0]++),
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),
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),
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SliverLayoutBuilder(
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builder: (BuildContext context, SliverConstraints constraint) => SliverToBoxAdapter(
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child: SizedBox(
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height: 200,
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child: GestureDetector(onTap: () => hitCounts[1]++),
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),
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),
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),
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SliverToBoxAdapter(
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child: SizedBox(
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height: 200,
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child: GestureDetector(onTap: () => hitCounts[2]++),
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),
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),
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],
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),
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),
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),
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);
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// Tap item 1.
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await tester.tapAt(const Offset(300, 50.0 + 100));
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await tester.pump();
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expect(hitCounts, const <int> [1, 0, 0]);
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// Tap item 2.
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await tester.tapAt(const Offset(300, 50.0 + 100 + 200));
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await tester.pump();
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expect(hitCounts, const <int> [1, 1, 0]);
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// Tap item 3. Shift the touch point up to ensure the touch lands within the viewport.
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await tester.tapAt(const Offset(300, 50.0 + 200 + 200 + 10));
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await tester.pump();
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expect(hitCounts, const <int> [1, 1, 1]);
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// Scrolling doesn't break it.
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hitCounts = <int> [0, 0, 0];
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scrollController.jumpTo(100);
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await tester.pump();
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// Tap item 1.
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await tester.tapAt(const Offset(300, 50.0 + 100 - 100));
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await tester.pump();
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expect(hitCounts, const <int> [1, 0, 0]);
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// Tap item 2.
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await tester.tapAt(const Offset(300, 50.0 + 100 + 200 - 100));
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await tester.pump();
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expect(hitCounts, const <int> [1, 1, 0]);
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// Tap item 3.
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await tester.tapAt(const Offset(300, 50.0 + 100 + 200 + 200 - 100));
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await tester.pump();
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expect(hitCounts, const <int> [1, 1, 1]);
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|
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// Tapping outside of the viewport shouldn't do anything.
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|
await tester.tapAt(const Offset(300, 1));
|
|
await tester.pump();
|
|
expect(hitCounts, const <int> [1, 1, 1]);
|
|
|
|
await tester.tapAt(const Offset(300, 599));
|
|
await tester.pump();
|
|
expect(hitCounts, const <int> [1, 1, 1]);
|
|
|
|
await tester.tapAt(const Offset(1, 100));
|
|
await tester.pump();
|
|
expect(hitCounts, const <int> [1, 1, 1]);
|
|
|
|
await tester.tapAt(const Offset(799, 100));
|
|
await tester.pump();
|
|
expect(hitCounts, const <int> [1, 1, 1]);
|
|
|
|
// Tap the no-content area in the viewport shouldn't do anything
|
|
hitCounts = <int> [0, 0, 0];
|
|
await tester.pumpWidget(
|
|
Directionality(
|
|
textDirection: TextDirection.ltr,
|
|
child: CustomScrollView(
|
|
controller: scrollController,
|
|
slivers: <Widget>[
|
|
SliverToBoxAdapter(
|
|
child: SizedBox(
|
|
height: 100,
|
|
child: GestureDetector(onTap: () => hitCounts[0]++),
|
|
),
|
|
),
|
|
SliverLayoutBuilder(
|
|
builder: (BuildContext context, SliverConstraints constraint) => SliverToBoxAdapter(
|
|
child: SizedBox(
|
|
height: 100,
|
|
child: GestureDetector(onTap: () => hitCounts[1]++),
|
|
),
|
|
),
|
|
),
|
|
SliverToBoxAdapter(
|
|
child: SizedBox(
|
|
height: 100,
|
|
child: GestureDetector(onTap: () => hitCounts[2]++),
|
|
),
|
|
),
|
|
],
|
|
),
|
|
),
|
|
);
|
|
|
|
await tester.tapAt(const Offset(300, 301));
|
|
await tester.pump();
|
|
expect(hitCounts, const <int> [0, 0, 0]);
|
|
});
|
|
|
|
testWidgets('LayoutBuilder does not call builder when layout happens but layout constraints do not change', (WidgetTester tester) async {
|
|
int builderInvocationCount = 0;
|
|
|
|
Future<void> pumpTestWidget(Size size) async {
|
|
await tester.pumpWidget(
|
|
// Center is used to give the SizedBox the power to determine constraints for LayoutBuilder
|
|
Center(
|
|
child: SizedBox.fromSize(
|
|
size: size,
|
|
child: LayoutBuilder(builder: (BuildContext context, BoxConstraints constraints) {
|
|
builderInvocationCount += 1;
|
|
return const _LayoutSpy();
|
|
}),
|
|
),
|
|
),
|
|
);
|
|
}
|
|
|
|
await pumpTestWidget(const Size(10, 10));
|
|
|
|
final _RenderLayoutSpy spy = tester.renderObject(find.byType(_LayoutSpy));
|
|
|
|
// The child is laid out once the first time.
|
|
expect(spy.performLayoutCount, 1);
|
|
expect(spy.performResizeCount, 1);
|
|
|
|
// The initial `pumpWidget` will trigger `performRebuild`, asking for
|
|
// builder invocation.
|
|
expect(builderInvocationCount, 1);
|
|
|
|
// Invalidate the layout without changing the constraints.
|
|
tester.renderObject(find.byType(LayoutBuilder)).markNeedsLayout();
|
|
|
|
// The second pump will not go through the `performRebuild` or `update`, and
|
|
// only judge the need for builder invocation based on constraints, which
|
|
// didn't change, so we don't expect any counters to go up.
|
|
await tester.pump();
|
|
expect(builderInvocationCount, 1);
|
|
expect(spy.performLayoutCount, 1);
|
|
expect(spy.performResizeCount, 1);
|
|
|
|
// Cause the `update` to be called (but not `performRebuild`), triggering
|
|
// builder invocation.
|
|
await pumpTestWidget(const Size(10, 10));
|
|
expect(builderInvocationCount, 2);
|
|
|
|
// The spy does not invalidate its layout on widget update, so no
|
|
// layout-related methods should be called.
|
|
expect(spy.performLayoutCount, 1);
|
|
expect(spy.performResizeCount, 1);
|
|
|
|
// Have the child request layout and verify that the child gets laid out
|
|
// despite layout constraints remaining constant.
|
|
spy.markNeedsLayout();
|
|
await tester.pump();
|
|
|
|
// Builder is not invoked. This was a layout-only pump with the same parent
|
|
// constraints.
|
|
expect(builderInvocationCount, 2);
|
|
|
|
// Expect performLayout to be called.
|
|
expect(spy.performLayoutCount, 2);
|
|
|
|
// performResize should not be called because the spy sets sizedByParent,
|
|
// and the constraints did not change.
|
|
expect(spy.performResizeCount, 1);
|
|
|
|
// Change the parent size, triggering constraint change.
|
|
await pumpTestWidget(const Size(20, 20));
|
|
|
|
// We should see everything invoked once.
|
|
expect(builderInvocationCount, 3);
|
|
expect(spy.performLayoutCount, 3);
|
|
expect(spy.performResizeCount, 2);
|
|
});
|
|
|
|
testWidgets('LayoutBuilder descendant widget can access [RenderBox.size] when rebuilding during layout', (WidgetTester tester) async {
|
|
Size? childSize;
|
|
int buildCount = 0;
|
|
|
|
Future<void> pumpTestWidget(Size size) async {
|
|
await tester.pumpWidget(
|
|
// Center is used to give the SizedBox the power to determine constraints for LayoutBuilder
|
|
Center(
|
|
child: SizedBox.fromSize(
|
|
size: size,
|
|
child: LayoutBuilder(builder: (BuildContext context, BoxConstraints constraints) {
|
|
buildCount++;
|
|
if (buildCount > 1) {
|
|
final _RenderLayoutSpy spy = tester.renderObject(find.byType(_LayoutSpy));
|
|
childSize = spy.size;
|
|
}
|
|
return const ColoredBox(
|
|
color: Color(0xffffffff),
|
|
child: _LayoutSpy(),
|
|
);
|
|
}),
|
|
),
|
|
),
|
|
);
|
|
}
|
|
|
|
await pumpTestWidget(const Size(10.0, 10.0));
|
|
expect(childSize, isNull);
|
|
await pumpTestWidget(const Size(10.0, 10.0));
|
|
expect(childSize, const Size(10.0, 10.0));
|
|
});
|
|
}
|
|
|
|
class _LayoutSpy extends LeafRenderObjectWidget {
|
|
const _LayoutSpy();
|
|
|
|
@override
|
|
LeafRenderObjectElement createElement() => _LayoutSpyElement(this);
|
|
|
|
@override
|
|
RenderObject createRenderObject(BuildContext context) => _RenderLayoutSpy();
|
|
}
|
|
|
|
class _LayoutSpyElement extends LeafRenderObjectElement {
|
|
_LayoutSpyElement(super.widget);
|
|
}
|
|
|
|
class _RenderLayoutSpy extends RenderBox {
|
|
int performLayoutCount = 0;
|
|
int performResizeCount = 0;
|
|
|
|
@override
|
|
bool get sizedByParent => true;
|
|
|
|
@override
|
|
void performResize() {
|
|
performResizeCount += 1;
|
|
size = constraints.biggest;
|
|
}
|
|
|
|
@override
|
|
Size computeDryLayout(BoxConstraints constraints) {
|
|
return constraints.biggest;
|
|
}
|
|
|
|
@override
|
|
void performLayout() {
|
|
performLayoutCount += 1;
|
|
}
|
|
}
|