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Add tabs_utils.dart
class (#143937)
This a test utility class for `tabs_test.dart` to prepare the class for Material 3 tests updates. More info in https://github.com/flutter/flutter/issues/139076
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packages/flutter/test/material/tabs_utils.dart
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230
packages/flutter/test/material/tabs_utils.dart
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// 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/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter_test/flutter_test.dart';
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// This returns render paragraph of the Tab label text.
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RenderParagraph getTabText(WidgetTester tester, String text) {
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return tester.renderObject<RenderParagraph>(find.descendant(
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of: find.byWidgetPredicate((Widget widget) => widget.runtimeType.toString() == '_TabStyle'),
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matching: find.text(text),
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));
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}
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// This creates and returns a TabController.
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TabController createTabController({
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required int length,
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required TickerProvider vsync,
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int initialIndex = 0,
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Duration? animationDuration,
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}) {
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final TabController result = TabController(
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length: length,
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vsync: vsync,
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initialIndex: initialIndex,
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animationDuration: animationDuration,
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);
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addTearDown(result.dispose);
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return result;
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}
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// This widget is used to test widget state in the tabs_test.dart file.
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class TabStateMarker extends StatefulWidget {
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const TabStateMarker({ super.key, this.child });
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final Widget? child;
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@override
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TabStateMarkerState createState() => TabStateMarkerState();
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}
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class TabStateMarkerState extends State<TabStateMarker> {
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String? marker;
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@override
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Widget build(BuildContext context) {
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return widget.child ?? Container();
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}
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}
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// Tab controller builder for TabControllerFrame widget.
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typedef TabControllerFrameBuilder = Widget Function(BuildContext context, TabController controller);
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// This widget creates a TabController and passes it to the builder.
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class TabControllerFrame extends StatefulWidget {
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const TabControllerFrame({
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super.key,
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required this.length,
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this.initialIndex = 0,
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required this.builder,
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});
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final int length;
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final int initialIndex;
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final TabControllerFrameBuilder builder;
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@override
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TabControllerFrameState createState() => TabControllerFrameState();
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}
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class TabControllerFrameState extends State<TabControllerFrame> with SingleTickerProviderStateMixin {
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late TabController _controller;
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@override
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void initState() {
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super.initState();
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_controller = TabController(
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vsync: this,
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length: widget.length,
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initialIndex: widget.initialIndex,
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);
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}
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return widget.builder(context, _controller);
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}
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}
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// Test utility class to test tab indicator drawing.
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class TabIndicatorRecordingCanvas extends TestRecordingCanvas {
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TabIndicatorRecordingCanvas(this.indicatorColor);
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final Color indicatorColor;
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late Rect indicatorRect;
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@override
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void drawLine(Offset p1, Offset p2, Paint paint) {
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// Assuming that the indicatorWeight is 2.0, the default.
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const double indicatorWeight = 2.0;
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if (paint.color == indicatorColor) {
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indicatorRect = Rect.fromPoints(p1, p2).inflate(indicatorWeight / 2.0);
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}
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}
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}
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// This creates a Fake implementation of ScrollMetrics.
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class TabMockScrollMetrics extends Fake implements ScrollMetrics { }
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class TabBarTestScrollPhysics extends ScrollPhysics {
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const TabBarTestScrollPhysics({ super.parent });
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@override
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TabBarTestScrollPhysics applyTo(ScrollPhysics? ancestor) {
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return TabBarTestScrollPhysics(parent: buildParent(ancestor));
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}
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@override
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double applyPhysicsToUserOffset(ScrollMetrics position, double offset) {
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return offset == 10 ? 20 : offset;
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}
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static final SpringDescription _kDefaultSpring = SpringDescription.withDampingRatio(
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mass: 0.5,
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stiffness: 500.0,
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ratio: 1.1,
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);
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@override
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SpringDescription get spring => _kDefaultSpring;
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}
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// This widget is used to log the lifecycle of the TabBarView children.
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class TabBody extends StatefulWidget {
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const TabBody({
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super.key,
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required this.index,
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required this.log,
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this.marker = '',
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});
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final int index;
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final List<String> log;
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final String marker;
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@override
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State<TabBody> createState() => TabBodyState();
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}
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class TabBodyState extends State<TabBody> {
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@override
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void initState() {
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widget.log.add('init: ${widget.index}');
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super.initState();
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}
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@override
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void didUpdateWidget(TabBody oldWidget) {
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super.didUpdateWidget(oldWidget);
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// To keep the logging straight, widgets must not change their index.
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assert(oldWidget.index == widget.index);
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}
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@override
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void dispose() {
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widget.log.add('dispose: ${widget.index}');
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return Center(
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child: widget.marker.isEmpty
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? Text('${widget.index}')
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: Text('${widget.index}-${widget.marker}'),
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);
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}
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}
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// This widget is used to test the lifecycle of the TabBarView children with Ink widget.
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class TabKeepAliveInk extends StatefulWidget {
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const TabKeepAliveInk({ super.key, required this.title });
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final String title;
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@override
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State<StatefulWidget> createState() => _TabKeepAliveInkState();
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}
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class _TabKeepAliveInkState extends State<TabKeepAliveInk> with AutomaticKeepAliveClientMixin {
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@override
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bool get wantKeepAlive => true;
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@override
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Widget build(BuildContext context) {
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super.build(context);
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return Ink(
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child: Text(widget.title),
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);
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}
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}
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// This widget is used to test the lifecycle of the TabBarView children.
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class TabAlwaysKeepAliveWidget extends StatefulWidget {
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const TabAlwaysKeepAliveWidget({super.key});
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static String text = 'AlwaysKeepAlive';
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@override
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State<TabAlwaysKeepAliveWidget> createState() => _TabAlwaysKeepAliveWidgetState();
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}
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class _TabAlwaysKeepAliveWidgetState extends State<TabAlwaysKeepAliveWidget> with AutomaticKeepAliveClientMixin {
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@override
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bool get wantKeepAlive => true;
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@override
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Widget build(BuildContext context) {
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super.build(context);
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return Text(TabAlwaysKeepAliveWidget.text);
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}
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}
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