Dark theme in Windows 10 has a light title bar

[fdennis]

Steps to Reproduce

1. Change Windows theme to Dark Mode.
2. Create a new Flutter project.
3. Use the demo app but change one line to use Dark Mode: theme: ThemeData.dark(),
4. Start the demo app and notice that the title bar is light:

Shouldn't the title bar also be dark, since the Windows theme is in dark mode? Microsoft has written about this here https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/apply-windows-themes#enable-a-dark-mode-title-bar-for-win32-applications but I am wondering if this is something Flutter can do?

Expected results: Title bar is expected to be dark.

Actual results: Title bar is light.

Code sample

```dart import 'package:flutter/material.dart'; void main() { runApp(const MyApp()); } class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData.dark(), home: const MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { const MyHomePage({Key? key, required this.title}) : super(key: key); // This widget is the home page of your application. It is stateful, meaning // that it has a State object (defined below) that contains fields that affect // how it looks. // This class is the configuration for the state. It holds the values (in this // case the title) provided by the parent (in this case the App widget) and // used by the build method of the State. Fields in a Widget subclass are // always marked "final". final String title; @override State createState() => _MyHomePageState(); } class _MyHomePageState extends State { int _counter = 0; void _incrementCounter() { setState(() { // This call to setState tells the Flutter framework that something has // changed in this State, which causes it to rerun the build method below // so that the display can reflect the updated values. If we changed // _counter without calling setState(), then the build method would not be // called again, and so nothing would appear to happen. _counter++; }); } @override Widget build(BuildContext context) { // This method is rerun every time setState is called, for instance as done // by the _incrementCounter method above. // // The Flutter framework has been optimized to make rerunning build methods // fast, so that you can just rebuild anything that needs updating rather // than having to individually change instances of widgets. return Scaffold( appBar: AppBar( // Here we take the value from the MyHomePage object that was created by // the App.build method, and use it to set our appbar title. title: Text(widget.title), ), body: Center( // Center is a layout widget. It takes a single child and positions it // in the middle of the parent. child: Column( // Column is also a layout widget. It takes a list of children and // arranges them vertically. By default, it sizes itself to fit its // children horizontally, and tries to be as tall as its parent. // // Invoke "debug painting" (press "p" in the console, choose the // "Toggle Debug Paint" action from the Flutter Inspector in Android // Studio, or the "Toggle Debug Paint" command in Visual Studio Code) // to see the wireframe for each widget. // // Column has various properties to control how it sizes itself and // how it positions its children. Here we use mainAxisAlignment to // center the children vertically; the main axis here is the vertical // axis because Columns are vertical (the cross axis would be // horizontal). mainAxisAlignment: MainAxisAlignment.center, children: [ const Text( 'You have pushed the button this many times:', ), Text( '$_counter', style: Theme.of(context).textTheme.headline4, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: _incrementCounter, tooltip: 'Increment', child: const Icon(Icons.add), ), // This trailing comma makes auto-formatting nicer for build methods. ); } } ```

Logs

``` ``` ``` ``` ``` ```

[timsneath]

Great catch, easy fix. @loic-sharma

[robiness]

I just started to dig into this and managed to set the title bar color to black from the flutter side.

While working on this a few questions regarding the expected behaviour came to my mind:

1. Who is responsible for the title bars color? The OS or the Application? If both, whats the priority?

   • If it's only windows, it is possible to override the title bar color of all windows via Settings -> Personalization -> Colors -> Show accent color on the following surfaces -> Title bars and window borders

2. Via DwmSetWindowAttribute only plain black is possible. More colors are possible but windows settings do not support that, so that somehow has to be defined in flutter

[jmagman]

https://github.com/flutter/flutter/pull/110890 was reverted.

[github-actions[bot]]

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