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Filling extra space
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import 'dart:async'; | |
import 'package:flutter/material.dart'; | |
import 'package:flutter_test/flutter_test.dart'; | |
class MyWidget extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return Row( | |
children: [ | |
BlueBox(), | |
BlueBox(), | |
BlueBox(), | |
], | |
); | |
} | |
} | |
class BlueBox extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return Container( | |
width: 50, | |
height: 50, | |
decoration: BoxDecoration( | |
color: Colors.blue, | |
border: Border.all(), | |
), | |
); | |
} | |
} |
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class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return Directionality( | |
textDirection: TextDirection.ltr, | |
child: Container( | |
color: Color(0xffeeeeee), | |
child: Center( | |
child: Container( | |
child: MyWidget(), | |
color: Color(0xffcccccc), | |
), | |
), | |
), | |
); | |
} | |
} | |
Future<void> main() async { | |
final completer = Completer<void>(); | |
runApp(MyApp()); | |
WidgetsFlutterBinding.ensureInitialized() | |
.addPostFrameCallback((timestamp) async { | |
completer.complete(); | |
}); | |
await completer.future; | |
final controller = LiveWidgetController(WidgetsBinding.instance); | |
final rows = controller.widgetList(find.byType(Row)); | |
if (rows.length == 0) { | |
_result(false, ['Couldn\'t find a Row!']); | |
return; | |
} | |
if (rows.length > 1) { | |
_result(false, ['Found ${rows.length} Rows, rather than just one.']); | |
return; | |
} | |
final row = rows.first as Row; | |
if (row.children.length != 3) { | |
_result(false, ['The Row should have three children, all BlueBox widgets.']); | |
return; | |
} | |
if (row.children[0] is! BlueBox) { | |
_result(false, ['The Row\'s first child should be a BlueBox widget.']); | |
return; | |
} | |
if (row.children[1] is! Expanded) { | |
_result(false, ['Notice how Row contains extra space on its main axis. Wrap the second BlueBox widget in an Expanded widget.']); | |
return; | |
} | |
if (row.children[2] is! BlueBox) { | |
_result(false, ['The Row\'s third child should be a Flexible widget.']); | |
return; | |
} | |
_result(true, ['Expanded forces second BlueBox widget to fill the extra space.']); | |
} |
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