758 lines
26 KiB
Dart
758 lines
26 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_test/flutter_test.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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class TestState extends State<StatefulWidget> {
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@override
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Widget build(BuildContext context) => null;
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}
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@optionalTypeArgs
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class _MyGlobalObjectKey<T extends State<StatefulWidget>> extends GlobalObjectKey<T> {
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const _MyGlobalObjectKey(Object value) : super(value);
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}
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void main() {
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testWidgets('UniqueKey control test', (WidgetTester tester) async {
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final Key key = UniqueKey();
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expect(key, hasOneLineDescription);
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expect(key, isNot(equals(UniqueKey())));
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});
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testWidgets('ObjectKey control test', (WidgetTester tester) async {
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final Object a = Object();
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final Object b = Object();
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final Key keyA = ObjectKey(a);
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final Key keyA2 = ObjectKey(a);
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final Key keyB = ObjectKey(b);
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expect(keyA, hasOneLineDescription);
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expect(keyA, equals(keyA2));
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expect(keyA.hashCode, equals(keyA2.hashCode));
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expect(keyA, isNot(equals(keyB)));
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});
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testWidgets('GlobalObjectKey toString test', (WidgetTester tester) async {
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const GlobalObjectKey one = GlobalObjectKey(1);
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const GlobalObjectKey<TestState> two = GlobalObjectKey<TestState>(2);
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const GlobalObjectKey three = _MyGlobalObjectKey(3);
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const GlobalObjectKey<TestState> four = _MyGlobalObjectKey<TestState>(4);
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expect(one.toString(), equals('[GlobalObjectKey ${describeIdentity(1)}]'));
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expect(two.toString(), equals('[GlobalObjectKey<TestState> ${describeIdentity(2)}]'));
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expect(three.toString(), equals('[_MyGlobalObjectKey ${describeIdentity(3)}]'));
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expect(four.toString(), equals('[_MyGlobalObjectKey<TestState> ${describeIdentity(4)}]'));
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});
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testWidgets('GlobalObjectKey control test', (WidgetTester tester) async {
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final Object a = Object();
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final Object b = Object();
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final Key keyA = GlobalObjectKey(a);
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final Key keyA2 = GlobalObjectKey(a);
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final Key keyB = GlobalObjectKey(b);
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expect(keyA, hasOneLineDescription);
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expect(keyA, equals(keyA2));
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expect(keyA.hashCode, equals(keyA2.hashCode));
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expect(keyA, isNot(equals(keyB)));
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});
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testWidgets('GlobalKey duplication 1 - double appearance', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(
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key: const ValueKey<int>(1),
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child: SizedBox(key: key),
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),
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Container(
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key: const ValueKey<int>(2),
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child: Placeholder(key: key),
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),
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],
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));
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final dynamic exception = tester.takeException();
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expect(exception, isFlutterError);
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expect(
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exception.toString(),
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equalsIgnoringHashCodes(
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'Multiple widgets used the same GlobalKey.\n'
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'The key [GlobalKey#00000 problematic] was used by multiple widgets. The parents of those widgets were:\n'
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'- Container-[<1>]\n'
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'- Container-[<2>]\n'
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'A GlobalKey can only be specified on one widget at a time in the widget tree.'
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),
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);
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});
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testWidgets('GlobalKey duplication 2 - splitting and changing type', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(
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key: const ValueKey<int>(1),
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),
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Container(
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key: const ValueKey<int>(2),
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),
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Container(
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key: key
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),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(
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key: const ValueKey<int>(1),
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child: SizedBox(key: key),
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),
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Container(
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key: const ValueKey<int>(2),
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child: Placeholder(key: key),
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),
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],
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));
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final dynamic exception = tester.takeException();
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expect(exception, isFlutterError);
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expect(
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exception.toString(),
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equalsIgnoringHashCodes(
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'Multiple widgets used the same GlobalKey.\n'
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'The key [GlobalKey#00000 problematic] was used by multiple widgets. The parents of those widgets were:\n'
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'- Container-[<1>]\n'
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'- Container-[<2>]\n'
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'A GlobalKey can only be specified on one widget at a time in the widget tree.'
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),
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);
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});
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testWidgets('GlobalKey duplication 3 - splitting and changing type', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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SizedBox(key: key),
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Placeholder(key: key),
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],
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));
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final dynamic exception = tester.takeException();
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expect(exception, isFlutterError);
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expect(
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exception.toString(),
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equalsIgnoringHashCodes(
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'Multiple widgets used the same GlobalKey.\n'
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'The key [GlobalKey#00000 problematic] was used by 2 widgets:\n'
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' SizedBox-[GlobalKey#00000 problematic]\n'
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' Placeholder-[GlobalKey#00000 problematic]\n'
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'A GlobalKey can only be specified on one widget at a time in the widget tree.'
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),
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);
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});
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testWidgets('GlobalKey duplication 4 - splitting and half changing type', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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Placeholder(key: key),
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],
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));
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final dynamic exception = tester.takeException();
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expect(exception, isFlutterError);
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expect(
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exception.toString(),
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equalsIgnoringHashCodes(
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'Multiple widgets used the same GlobalKey.\n'
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'The key [GlobalKey#00000 problematic] was used by 2 widgets:\n'
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' Container-[GlobalKey#00000 problematic]\n'
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' Placeholder-[GlobalKey#00000 problematic]\n'
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'A GlobalKey can only be specified on one widget at a time in the widget tree.'
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),
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);
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});
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testWidgets('GlobalKey duplication 5 - splitting and half changing type', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Placeholder(key: key),
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Container(key: key),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 6 - splitting and not changing type', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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Container(key: key),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 7 - appearing later', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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Container(key: const ValueKey<int>(2)),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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Container(key: const ValueKey<int>(2), child: Container(key: key)),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 8 - appearing earlier', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(1)),
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Container(key: const ValueKey<int>(2), child: Container(key: key)),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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Container(key: const ValueKey<int>(2), child: Container(key: key)),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 9 - moving and appearing later', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(0), child: Container(key: key)),
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Container(key: const ValueKey<int>(1)),
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Container(key: const ValueKey<int>(2)),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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Container(key: const ValueKey<int>(2), child: Container(key: key)),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 10 - moving and appearing earlier', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(1)),
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Container(key: const ValueKey<int>(2)),
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Container(key: const ValueKey<int>(3), child: Container(key: key)),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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Container(key: const ValueKey<int>(2), child: Container(key: key)),
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Container(key: const ValueKey<int>(3)),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 11 - double sibling appearance', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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Container(key: key),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 12 - all kinds of badness at once', (WidgetTester tester) async {
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final Key key1 = GlobalKey(debugLabel: 'problematic');
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final Key key2 = GlobalKey(debugLabel: 'problematic'); // intentionally the same label
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final Key key3 = GlobalKey(debugLabel: 'also problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key1),
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Container(key: key1),
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Container(key: key2),
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Container(key: key1),
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Container(key: key1),
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Container(key: key2),
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Container(key: key1),
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Container(key: key1),
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Row(
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children: <Widget>[
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Container(key: key1),
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Container(key: key1),
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Container(key: key2),
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Container(key: key2),
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Container(key: key2),
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Container(key: key3),
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Container(key: key2),
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],
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),
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Row(
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children: <Widget>[
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Container(key: key1),
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Container(key: key1),
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Container(key: key3),
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],
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),
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Container(key: key3),
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],
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));
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final dynamic exception = tester.takeException();
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expect(exception, isFlutterError);
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expect(
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exception.toString(),
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equalsIgnoringHashCodes(
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'Duplicate keys found.\n'
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'If multiple keyed nodes exist as children of another node, they must have unique keys.\n'
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'Stack(alignment: AlignmentDirectional.topStart, textDirection: ltr, fit: loose, overflow: clip) has multiple children with key [GlobalKey#00000 problematic].'
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),
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);
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});
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testWidgets('GlobalKey duplication 13 - all kinds of badness at once', (WidgetTester tester) async {
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final Key key1 = GlobalKey(debugLabel: 'problematic');
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final Key key2 = GlobalKey(debugLabel: 'problematic'); // intentionally the same label
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final Key key3 = GlobalKey(debugLabel: 'also problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key1),
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Container(key: key2),
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Container(key: key3),
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]),
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);
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key1),
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Container(key: key1),
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Container(key: key2),
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Container(key: key1),
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Container(key: key1),
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Container(key: key2),
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Container(key: key1),
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Container(key: key1),
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Row(
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children: <Widget>[
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Container(key: key1),
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Container(key: key1),
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Container(key: key2),
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Container(key: key2),
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Container(key: key2),
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Container(key: key3),
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Container(key: key2),
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],
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),
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Row(
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children: <Widget>[
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Container(key: key1),
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Container(key: key1),
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Container(key: key3),
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],
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),
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Container(key: key3),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 14 - moving during build - before', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1)),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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],
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));
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});
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testWidgets('GlobalKey duplication 15 - duplicating during build - before', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1)),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: key),
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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],
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));
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expect(tester.takeException(), isFlutterError);
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});
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testWidgets('GlobalKey duplication 16 - moving during build - after', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1)),
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Container(key: key),
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],
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));
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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],
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));
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});
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testWidgets('GlobalKey duplication 17 - duplicating during build - after', (WidgetTester tester) async {
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final Key key = GlobalKey(debugLabel: 'problematic');
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1)),
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Container(key: key),
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],
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));
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int count = 0;
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final FlutterExceptionHandler oldHandler = FlutterError.onError;
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FlutterError.onError = (FlutterErrorDetails details) {
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expect(details.exception, isFlutterError);
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count += 1;
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};
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await tester.pumpWidget(Stack(
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textDirection: TextDirection.ltr,
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children: <Widget>[
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Container(key: const ValueKey<int>(0)),
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Container(key: const ValueKey<int>(1), child: Container(key: key)),
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Container(key: key),
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],
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));
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FlutterError.onError = oldHandler;
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expect(count, 2);
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});
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testWidgets('GlobalKey - dettach and re-attach child to different parents', (WidgetTester tester) async {
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await tester.pumpWidget(Directionality(
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textDirection: TextDirection.ltr,
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child: Center(
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child: Container(
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height: 100,
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child: CustomScrollView(
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controller: ScrollController(),
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slivers: <Widget>[
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SliverList(
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delegate: SliverChildListDelegate(<Widget>[
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Text('child', key: GlobalKey()),
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]),
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),
|
|
],
|
|
),
|
|
),
|
|
),
|
|
));
|
|
final SliverMultiBoxAdaptorElement element = tester.element(find.byType(SliverList));
|
|
Element childElement;
|
|
// Removing and recreating child with same Global Key should not trigger
|
|
// duplicate key error.
|
|
element.visitChildren((Element e) {
|
|
childElement = e;
|
|
});
|
|
element.removeChild(childElement.renderObject as RenderBox);
|
|
element.createChild(0, after: null);
|
|
element.visitChildren((Element e) {
|
|
childElement = e;
|
|
});
|
|
element.removeChild(childElement.renderObject as RenderBox);
|
|
element.createChild(0, after: null);
|
|
});
|
|
|
|
testWidgets('Defunct setState throws exception', (WidgetTester tester) async {
|
|
StateSetter setState;
|
|
|
|
await tester.pumpWidget(StatefulBuilder(
|
|
builder: (BuildContext context, StateSetter setter) {
|
|
setState = setter;
|
|
return Container();
|
|
},
|
|
));
|
|
|
|
// Control check that setState doesn't throw an exception.
|
|
setState(() { });
|
|
|
|
await tester.pumpWidget(Container());
|
|
|
|
expect(() { setState(() { }); }, throwsFlutterError);
|
|
});
|
|
|
|
testWidgets('State toString', (WidgetTester tester) async {
|
|
final TestState state = TestState();
|
|
expect(state.toString(), contains('no widget'));
|
|
});
|
|
|
|
testWidgets('debugPrintGlobalKeyedWidgetLifecycle control test', (WidgetTester tester) async {
|
|
expect(debugPrintGlobalKeyedWidgetLifecycle, isFalse);
|
|
|
|
final DebugPrintCallback oldCallback = debugPrint;
|
|
debugPrintGlobalKeyedWidgetLifecycle = true;
|
|
|
|
final List<String> log = <String>[];
|
|
debugPrint = (String message, { int wrapWidth }) {
|
|
log.add(message);
|
|
};
|
|
|
|
final GlobalKey key = GlobalKey();
|
|
await tester.pumpWidget(Container(key: key));
|
|
expect(log, isEmpty);
|
|
await tester.pumpWidget(const Placeholder());
|
|
debugPrint = oldCallback;
|
|
debugPrintGlobalKeyedWidgetLifecycle = false;
|
|
|
|
expect(log.length, equals(2));
|
|
expect(log[0], matches('Deactivated'));
|
|
expect(log[1], matches('Discarding .+ from inactive elements list.'));
|
|
});
|
|
|
|
testWidgets('MultiChildRenderObjectElement.children', (WidgetTester tester) async {
|
|
GlobalKey key0, key1, key2;
|
|
await tester.pumpWidget(Column(
|
|
key: key0 = GlobalKey(),
|
|
children: <Widget>[
|
|
Container(),
|
|
Container(key: key1 = GlobalKey()),
|
|
Container(child: Container()),
|
|
Container(key: key2 = GlobalKey()),
|
|
Container(),
|
|
],
|
|
));
|
|
final MultiChildRenderObjectElement element = key0.currentContext as MultiChildRenderObjectElement;
|
|
expect(
|
|
element.children.map((Element element) => element.widget.key),
|
|
<Key>[null, key1, null, key2, null],
|
|
);
|
|
});
|
|
|
|
testWidgets('Element diagnostics', (WidgetTester tester) async {
|
|
GlobalKey key0;
|
|
await tester.pumpWidget(Column(
|
|
key: key0 = GlobalKey(),
|
|
children: <Widget>[
|
|
Container(),
|
|
Container(key: GlobalKey()),
|
|
Container(child: Container()),
|
|
Container(key: GlobalKey()),
|
|
Container(),
|
|
],
|
|
));
|
|
final MultiChildRenderObjectElement element = key0.currentContext as MultiChildRenderObjectElement;
|
|
|
|
expect(element, hasAGoodToStringDeep);
|
|
expect(
|
|
element.toStringDeep(),
|
|
equalsIgnoringHashCodes(
|
|
'Column-[GlobalKey#00000](direction: vertical, mainAxisAlignment: start, crossAxisAlignment: center, renderObject: RenderFlex#00000)\n'
|
|
'├Container\n'
|
|
'│└LimitedBox(maxWidth: 0.0, maxHeight: 0.0, renderObject: RenderLimitedBox#00000 relayoutBoundary=up1)\n'
|
|
'│ └ConstrainedBox(BoxConstraints(biggest), renderObject: RenderConstrainedBox#00000 relayoutBoundary=up2)\n'
|
|
'├Container-[GlobalKey#00000]\n'
|
|
'│└LimitedBox(maxWidth: 0.0, maxHeight: 0.0, renderObject: RenderLimitedBox#00000 relayoutBoundary=up1)\n'
|
|
'│ └ConstrainedBox(BoxConstraints(biggest), renderObject: RenderConstrainedBox#00000 relayoutBoundary=up2)\n'
|
|
'├Container\n'
|
|
'│└Container\n'
|
|
'│ └LimitedBox(maxWidth: 0.0, maxHeight: 0.0, renderObject: RenderLimitedBox#00000 relayoutBoundary=up1)\n'
|
|
'│ └ConstrainedBox(BoxConstraints(biggest), renderObject: RenderConstrainedBox#00000 relayoutBoundary=up2)\n'
|
|
'├Container-[GlobalKey#00000]\n'
|
|
'│└LimitedBox(maxWidth: 0.0, maxHeight: 0.0, renderObject: RenderLimitedBox#00000 relayoutBoundary=up1)\n'
|
|
'│ └ConstrainedBox(BoxConstraints(biggest), renderObject: RenderConstrainedBox#00000 relayoutBoundary=up2)\n'
|
|
'└Container\n'
|
|
' └LimitedBox(maxWidth: 0.0, maxHeight: 0.0, renderObject: RenderLimitedBox#00000 relayoutBoundary=up1)\n'
|
|
' └ConstrainedBox(BoxConstraints(biggest), renderObject: RenderConstrainedBox#00000 relayoutBoundary=up2)\n',
|
|
),
|
|
);
|
|
});
|
|
|
|
testWidgets('Element diagnostics with null child', (WidgetTester tester) async {
|
|
await tester.pumpWidget(const NullChildTest());
|
|
final NullChildElement test = tester.element<NullChildElement>(find.byType(NullChildTest));
|
|
test.includeChild = true;
|
|
expect(
|
|
tester.binding.renderViewElement.toStringDeep(),
|
|
equalsIgnoringHashCodes(
|
|
'[root](renderObject: RenderView#4a0f0)\n'
|
|
'└NullChildTest(dirty)\n'
|
|
' └<null child>\n',
|
|
),
|
|
);
|
|
test.includeChild = false;
|
|
});
|
|
|
|
testWidgets('scheduleBuild while debugBuildingDirtyElements is true', (WidgetTester tester) async {
|
|
/// ignore here is required for testing purpose because changing the flag properly is hard
|
|
// ignore: invalid_use_of_protected_member
|
|
tester.binding.debugBuildingDirtyElements = true;
|
|
FlutterError error;
|
|
try {
|
|
tester.binding.buildOwner.scheduleBuildFor(
|
|
DirtyElementWithCustomBuildOwner(tester.binding.buildOwner, Container()));
|
|
} on FlutterError catch (e) {
|
|
error = e;
|
|
} finally {
|
|
expect(error, isNotNull);
|
|
expect(error.diagnostics.length, 3);
|
|
expect(error.diagnostics.last.level, DiagnosticLevel.hint);
|
|
expect(
|
|
error.diagnostics.last.toStringDeep(),
|
|
equalsIgnoringHashCodes(
|
|
'This might be because setState() was called from a layout or\n'
|
|
'paint callback. If a change is needed to the widget tree, it\n'
|
|
'should be applied as the tree is being built. Scheduling a change\n'
|
|
'for the subsequent frame instead results in an interface that\n'
|
|
'lags behind by one frame. If this was done to make your build\n'
|
|
'dependent on a size measured at layout time, consider using a\n'
|
|
'LayoutBuilder, CustomSingleChildLayout, or\n'
|
|
'CustomMultiChildLayout. If, on the other hand, the one frame\n'
|
|
'delay is the desired effect, for example because this is an\n'
|
|
'animation, consider scheduling the frame in a post-frame callback\n'
|
|
'using SchedulerBinding.addPostFrameCallback or using an\n'
|
|
'AnimationController to trigger the animation.\n',
|
|
),
|
|
);
|
|
expect(
|
|
error.toStringDeep(),
|
|
'FlutterError\n'
|
|
' Build scheduled during frame.\n'
|
|
' While the widget tree was being built, laid out, and painted, a\n'
|
|
' new frame was scheduled to rebuild the widget tree.\n'
|
|
' This might be because setState() was called from a layout or\n'
|
|
' paint callback. If a change is needed to the widget tree, it\n'
|
|
' should be applied as the tree is being built. Scheduling a change\n'
|
|
' for the subsequent frame instead results in an interface that\n'
|
|
' lags behind by one frame. If this was done to make your build\n'
|
|
' dependent on a size measured at layout time, consider using a\n'
|
|
' LayoutBuilder, CustomSingleChildLayout, or\n'
|
|
' CustomMultiChildLayout. If, on the other hand, the one frame\n'
|
|
' delay is the desired effect, for example because this is an\n'
|
|
' animation, consider scheduling the frame in a post-frame callback\n'
|
|
' using SchedulerBinding.addPostFrameCallback or using an\n'
|
|
' AnimationController to trigger the animation.\n',
|
|
);
|
|
}
|
|
});
|
|
}
|
|
|
|
class NullChildTest extends Widget {
|
|
const NullChildTest({ Key key }) : super(key: key);
|
|
@override
|
|
Element createElement() => NullChildElement(this);
|
|
}
|
|
|
|
class NullChildElement extends Element {
|
|
NullChildElement(Widget widget) : super(widget);
|
|
|
|
bool includeChild = false;
|
|
|
|
@override
|
|
void visitChildren(ElementVisitor visitor) {
|
|
if (includeChild)
|
|
visitor(null);
|
|
}
|
|
|
|
@override
|
|
void forgetChild(Element child) { }
|
|
|
|
@override
|
|
void performRebuild() { }
|
|
}
|
|
|
|
|
|
class DirtyElementWithCustomBuildOwner extends Element {
|
|
DirtyElementWithCustomBuildOwner(BuildOwner buildOwner, Widget widget)
|
|
: _owner = buildOwner, super(widget);
|
|
|
|
final BuildOwner _owner;
|
|
|
|
@override
|
|
void forgetChild(Element child) {}
|
|
|
|
@override
|
|
void performRebuild() {}
|
|
|
|
@override
|
|
BuildOwner get owner => _owner;
|
|
|
|
@override
|
|
bool get dirty => true;
|
|
}
|