[material/dropdown_menu.dart] Dropdown body render object accesses this.constraints from computeDryLayout #176501
Description
Steps to reproduce
- Run example
Expected results
Does not throw
Actual results
Throws "Bad state: A RenderObject does not have any constraints before it has been laid out."
Code sample
Code sample
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
void main(List<String> args) {
runApp(
const MaterialApp(
home: Scaffold(
body: Center(
child: _TestDryLayout(
child: DropdownMenu<int>(
dropdownMenuEntries: <DropdownMenuEntry<int>>[
DropdownMenuEntry<int>(value: 1, label: 'One'),
DropdownMenuEntry<int>(value: 2, label: 'Two'),
],
),
),
),
),
),
);
}
class _TestDryLayout extends SingleChildRenderObjectWidget {
const _TestDryLayout({super.child});
@override
RenderObject createRenderObject(BuildContext context) {
return _RenderTestDryLayout();
}
}
class _RenderTestDryLayout extends RenderProxyBox {
@override
void performLayout() {
if (child == null) {
size = constraints.smallest;
return;
}
child!.getDryLayout(constraints);
child!.layout(constraints, parentUsesSize: true);
size = child!.size;
}
}
Screenshots or Video
Screenshots / Video demonstration
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Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
[✓] Flutter (Channel master, 3.37.0-1.0.pre-400, on macOS 15.5 24F74 darwin-arm64, locale
en-US) [2.0s]
• Flutter version 3.37.0-1.0.pre-400 on channel master at
/Users/davidhicks/fvm/versions/master
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 5c0c9e9e9a (10 hours ago), 2025-10-03 11:49:25 -0400
• Engine revision dca709fbbf
• Dart version 3.10.0 (build 3.10.0-278.0.dev)
• DevTools version 2.50.0
• Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop,
enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-native-assets,
omit-legacy-version-file, enable-lldb-debugging
[!] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [3.0s]
• Android SDK at /Users/davidhicks/Library/Android/sdk
• Emulator version 35.4.9.0 (build_id 13025442) (CL:N/A)
• Platform android-36, build-tools 35.0.0
• ANDROID_HOME = /Users/davidhicks/Library/Android/sdk
• Java binary at: /Library/Java/JavaVirtualMachines/jdk-17.0.2.jdk/Contents/Home/bin/java
This JDK is specified in your Flutter configuration.
To change the current JDK, run: `flutter config --jdk-dir="path/to/jdk"`.
• Java version Java(TM) SE Runtime Environment (build 17.0.2+8-LTS-86)
! Some Android licenses not accepted. To resolve this, run: flutter doctor
--android-licenses
[✓] Xcode - develop for iOS and macOS (Xcode 16.4) [1,590ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16F6
• CocoaPods version 1.16.2
[✓] Chrome - develop for the web [9ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Connected device (2 available) [6.6s]
• macOS (desktop) • macos • darwin-arm64 • macOS 15.5 24F74 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 140.0.7339.214
! Error: Browsing on the local area network for David’s iPhone. Ensure the device is
unlocked and attached with a cable or associated with the same local area network as this
Mac.
The device must be opted into Developer Mode to connect wirelessly. (code -27)
[✓] Network resources [251ms]
• All expected network resources are available.
! Doctor found issues in 1 category.