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Add ButtonGroupM3E component with overflow handling and update API to use actions

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Emily Pauli 2025-11-12 12:51:29 +01:00
commit 582af894f3
14 changed files with 1463 additions and 255 deletions
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packages/button_group_m3e/test/button_group_m3e_overflow_test.dart Normal file
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import 'package:button_group_m3e/button_group_m3e.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('does not overflow horizontally under bounded width by scrolling',
(tester) async {
final actions = List<ButtonGroupM3EAction>.generate(
8,
(i) => ButtonGroupM3EAction(
label: SizedBox(width: 120, height: 40, child: Text('A$i')),
onPressed: () {},
),
);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
width:
240, // force bounded width smaller than total children width
child: ButtonGroupM3E(
actions: actions,
// wrap=false by default
overflow: ButtonGroupM3EOverflow.scroll,
),
),
),
),
),
);
await tester.pumpAndSettle();
expect(tester.takeException(), isNull, reason: 'Should not overflow');
expect(find.byType(SingleChildScrollView), findsOneWidget);
});
testWidgets('wrap=true uses Wrap and avoids overflow without scroll',
(tester) async {
final actions = List<ButtonGroupM3EAction>.generate(
8,
(i) => ButtonGroupM3EAction(
label: SizedBox(width: 120, height: 40, child: Text('B$i')),
onPressed: () {},
),
);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
width: 240,
child: ButtonGroupM3E(
wrap: true,
runSpacing: 4,
spacing: 4,
actions: actions,
),
),
),
),
),
);
await tester.pumpAndSettle();
expect(tester.takeException(), isNull,
reason: 'Wrap should avoid overflow');
expect(find.byType(Wrap), findsOneWidget);
expect(find.byType(SingleChildScrollView), findsNothing);
});
testWidgets('vertical direction scrolls when height is bounded',
(tester) async {
final actions = List<ButtonGroupM3EAction>.generate(
8,
(i) => ButtonGroupM3EAction(
label: SizedBox(width: 100, height: 60, child: Text('C$i')),
onPressed: () {},
),
);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
height:
160, // bounded height smaller than sum of children heights
child: ButtonGroupM3E(
direction: Axis.vertical,
actions: actions,
overflow: ButtonGroupM3EOverflow.scroll,
),
),
),
),
),
);
await tester.pumpAndSettle();
expect(tester.takeException(), isNull);
expect(find.byType(SingleChildScrollView), findsOneWidget);
});
testWidgets('scroll overflow prevents RenderFlex overflow', (tester) async {
final actions = List<ButtonGroupM3EAction>.generate(
8,
(i) => ButtonGroupM3EAction(
label: SizedBox(width: 120, height: 40, child: Text('D$i')),
onPressed: () {},
),
);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
width: 240,
child: ButtonGroupM3E(
actions: actions,
overflow: ButtonGroupM3EOverflow.scroll,
),
),
),
),
),
);
await tester.pumpAndSettle();
expect(tester.takeException(), isNull);
expect(find.byType(SingleChildScrollView), findsOneWidget);
});
testWidgets('wrap=true uses Wrap and avoids scroll', (tester) async {
final actions = List<ButtonGroupM3EAction>.generate(
8,
(i) => ButtonGroupM3EAction(
label: SizedBox(width: 120, height: 40, child: Text('E$i')),
onPressed: () {},
),
);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
width: 240,
child: ButtonGroupM3E(
wrap: true,
runSpacing: 4,
spacing: 4,
actions: actions,
),
),
),
),
),
);
await tester.pumpAndSettle();
expect(tester.takeException(), isNull);
expect(find.byType(Wrap), findsOneWidget);
expect(find.byType(SingleChildScrollView), findsNothing);
});
testWidgets(
'menu overflow shows trigger and opens sheet with remaining children',
(tester) async {
final actions = List<ButtonGroupM3EAction>.generate(
6,
(i) => ButtonGroupM3EAction(
label: SizedBox(width: 100, height: 40, child: Text('M$i')),
onPressed: () {},
),
);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
width: 250, // Should not fit all 6 at ~100 each
child: ButtonGroupM3E(
actions: actions,
overflow: ButtonGroupM3EOverflow.menu,
),
),
),
),
),
);
await tester.pump();
// Overflow trigger should appear (IconButton default Icons.more_horiz)
expect(find.byIcon(Icons.more_horiz), findsOneWidget);
// Tap overflow trigger
await tester.tap(find.byIcon(Icons.more_horiz));
await tester.pumpAndSettle();
// Bottom sheet should appear
expect(find.byType(BottomSheet), findsOneWidget);
// All items should be accessible either inline or in sheet (texts M0..M5)
for (var i = 0; i < actions.length; i++) {
expect(find.text('M$i'), findsWidgets);
}
});
testWidgets('menu overflow does not appear if all children fit',
(tester) async {
final actions = List<ButtonGroupM3EAction>.generate(
3,
(i) => ButtonGroupM3EAction(
label: SizedBox(width: 60, height: 40, child: Text('F$i')),
onPressed: () {},
),
);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
width: 400, // Enough for all
child: ButtonGroupM3E(
actions: actions,
overflow: ButtonGroupM3EOverflow.menu,
),
),
),
),
),
);
await tester.pump();
expect(find.byIcon(Icons.more_horiz), findsNothing);
});
}