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[WIP][material_ui] add DropdownButton.builder constructor for lazy item loading by Mairramer · Pull Request #13124 · flutter/packages · GitHub
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[WIP][material_ui] add DropdownButton.builder constructor for lazy item loading #13124

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[WIP][material_ui] add DropdownButton.builder constructor for lazy item loading #13124

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75488a2
feat: add DropdownButton.builder constructor for lazy item loading
Mairramer Oct 4, 2026
536f5bf
refactor: remove value parameter from lazy DropdownButton constructor…
Mairramer Oct 4, 2026
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feat: add DropdownButton.builder constructor for lazy item loading
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@Mairramer
Mairramer committed Oct 4, 2026
commit 75488a23a53cb155a6a1cd8dd732c7e88c957e32
57 changes: 57 additions & 0 deletions packages/material_ui/example/lib/dropdown/dropdown_button.builder.0.dart
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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// #region body
import 'package:material_ui/material_ui.dart';

/// Flutter code sample for [DropdownButton.builder].

void main() => runApp(const DropdownButtonBuilderApp());

class DropdownButtonBuilderApp extends StatelessWidget {
const DropdownButtonBuilderApp({super.key});

@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('DropdownButton.builder Sample')),
body: const Center(child: DropdownButtonBuilderExample()),
),
);
}
}

class DropdownButtonBuilderExample extends StatefulWidget {
const DropdownButtonBuilderExample({super.key});

@override
State<DropdownButtonBuilderExample> createState() => _DropdownButtonBuilderExampleState();
}

class _DropdownButtonBuilderExampleState extends State<DropdownButtonBuilderExample> {
int? dropdownValue = 0;

@override
Widget build(BuildContext context) {
return DropdownButton<int>.builder(
value: dropdownValue,
selectedItemIndex: 100,
itemCount: 10000,
itemBuilder: (BuildContext context, int index) {
return DropdownMenuItem<int>(value: index, child: Text('Item $index'));
},
customSelectedItemBuilder: (BuildContext context, int? value) {
return Text('Selected Lazy Item $value');
},
onChanged: (int? value) {
// This is called when the user selects an item.
setState(() {
dropdownValue = value;
});
},
);
}
}
// #endregion body
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