flutter-plugins [desktop_multi_window] Sometimes a sub window does not display content

like this:

main.dart


void main(List<String> args) async {
  WidgetsFlutterBinding.ensureInitialized();

  if (args.firstOrNull == 'multi_window') {
    runApp(const MySubWindow());
  } else {
    // WidgetsFlutterBinding.ensureInitialized();

    await windowManager.ensureInitialized();

    windowManager.waitUntilReadyToShow().then((_) async {
      await windowManager.setTitle('我的第一个桌面应用');
      await windowManager.setSize(const Size(800, 600));
      await windowManager.setMinimumSize(const Size(800, 600));
      await windowManager.center();
      await windowManager.show();
      // await windowManager.setSkipTaskbar(false);
    });

    runApp(const MyApp());
  }
}

page code


import 'dart:convert';

import 'package:desktop_multi_window/desktop_multi_window.dart';
import 'package:flutter/material.dart';

class MultiWindowPage extends StatefulWidget {
  const MultiWindowPage({Key? key}) : super(key: key);

  @override
  State<MultiWindowPage> createState() => _MultiWindowPageState();
}

class _MultiWindowPageState extends State<MultiWindowPage> {
  void _addWindow() async {
    final window = await DesktopMultiWindow.createWindow(jsonEncode({}));
    window
      ..setFrame(const Offset(0, 0) & const Size(600, 450))
      ..center()
      ..setTitle('标题在这里')
      ..show();
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          ElevatedButton(
            onPressed: _addWindow,
            child: const Text('创建新窗口'),
          ),
        ],
      ),
    );
  }
}

sub window


import 'package:flutter/material.dart';

class MySubWindow extends StatelessWidget {
  const MySubWindow({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
        fontFamily: 'Microsoft YaHei',
      ),
      home: const Scaffold(
        body: Center(
          child: Text(
            '0101, 这里是07😎',
            style: TextStyle(fontSize: 24),
          ),
        ),
      ),
    );
  }
}

Mar 18 '22 09:03 ilgnefz

I test flow code with Flutter 2.13.0-0.0.pre.110 (master channel) on Windows 11, But it seems to work fine.

Which flutter are you using ?

After the child window is blank, will the screen appear automatically after a while?

example code

import 'dart:convert';

import 'package:collection/collection.dart';
import 'package:desktop_multi_window/desktop_multi_window.dart';
import 'package:flutter/material.dart';
import 'package:window_manager/window_manager.dart';

void main(List<String> args) async {
  WidgetsFlutterBinding.ensureInitialized();

  if (args.firstOrNull == 'multi_window') {
    runApp(const MySubWindow());
  } else {
    // WidgetsFlutterBinding.ensureInitialized();

    await windowManager.ensureInitialized();

    windowManager.waitUntilReadyToShow().then((_) async {
      await windowManager.setTitle('我的第一个桌面应用');
      await windowManager.setSize(const Size(800, 600));
      await windowManager.setMinimumSize(const Size(800, 600));
      await windowManager.center();
      await windowManager.show();
      // await windowManager.setSkipTaskbar(false);
    });

    runApp(const MaterialApp(home: MultiWindowPage()));
  }
}

class MultiWindowPage extends StatefulWidget {
  const MultiWindowPage({Key? key}) : super(key: key);

  @override
  State<MultiWindowPage> createState() => _MultiWindowPageState();
}

class _MultiWindowPageState extends State<MultiWindowPage> {
  void _addWindow() async {
    final window = await DesktopMultiWindow.createWindow(jsonEncode({}));
    window
      ..setFrame(const Offset(0, 0) & const Size(600, 450))
      ..center()
      ..setTitle('标题在这里')
      ..show();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: _addWindow,
              child: const Text('创建新窗口'),
            ),
          ],
        ),
      ),
    );
  }
}

class MySubWindow extends StatelessWidget {
  const MySubWindow({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
        fontFamily: 'Microsoft YaHei',
      ),
      home: const Scaffold(
        body: Center(
          child: Text(
            '0101, 这里是07😎',
            style: TextStyle(fontSize: 24),
          ),
        ),
      ),
    );
  }
}

Mar 21 '22 07:03 boyan01

I test flow code with Flutter 2.13.0-0.0.pre.110 (master channel) on Windows 11, But it seems to work fine.

Which flutter are you using ?

After the child window is blank, will the screen appear automatically after a while?

example code

import 'dart:convert';

import 'package:collection/collection.dart';
import 'package:desktop_multi_window/desktop_multi_window.dart';
import 'package:flutter/material.dart';
import 'package:window_manager/window_manager.dart';

void main(List<String> args) async {
  WidgetsFlutterBinding.ensureInitialized();

  if (args.firstOrNull == 'multi_window') {
    runApp(const MySubWindow());
  } else {
    // WidgetsFlutterBinding.ensureInitialized();

    await windowManager.ensureInitialized();

    windowManager.waitUntilReadyToShow().then((_) async {
      await windowManager.setTitle('我的第一个桌面应用');
      await windowManager.setSize(const Size(800, 600));
      await windowManager.setMinimumSize(const Size(800, 600));
      await windowManager.center();
      await windowManager.show();
      // await windowManager.setSkipTaskbar(false);
    });

    runApp(const MaterialApp(home: MultiWindowPage()));
  }
}

class MultiWindowPage extends StatefulWidget {
  const MultiWindowPage({Key? key}) : super(key: key);

  @override
  State<MultiWindowPage> createState() => _MultiWindowPageState();
}

class _MultiWindowPageState extends State<MultiWindowPage> {
  void _addWindow() async {
    final window = await DesktopMultiWindow.createWindow(jsonEncode({}));
    window
      ..setFrame(const Offset(0, 0) & const Size(600, 450))
      ..center()
      ..setTitle('标题在这里')
      ..show();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: _addWindow,
              child: const Text('创建新窗口'),
            ),
          ],
        ),
      ),
    );
  }
}

class MySubWindow extends StatelessWidget {
  const MySubWindow({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
        fontFamily: 'Microsoft YaHei',
      ),
      home: const Scaffold(
        body: Center(
          child: Text(
            '0101, 这里是07😎',
            style: TextStyle(fontSize: 24),
          ),
        ),
      ),
    );
  }
}

Flutter 2.10.3 • channel stable • https://github.com/flutter/flutter.git Framework • revision 7e9793dee1 (3 weeks ago) • 2022-03-02 11:23:12 -0600 Engine • revision bd539267b4 Tools • Dart 2.16.1 • DevTools 2.9.2

Windows10 Professional 21H2

Mar 21 '22 07:03 ilgnefz

I tried to reproduce it, and the debug mode almost never happened, but the profile/release would have a white screen or no response.

Thanks for your feedback.

Mar 21 '22 10:03 boyan01

Sorry to bother, is there any solution for this bug?

Dec 05 '22 11:12 Lililili-m

not have @Lililili-m

Dec 05 '22 12:12 ilgnefz

not have @Lililili-m

Can we know the cause of the problem?

Dec 06 '22 01:12 Lililili-m

@Lililili-m Sorry, I don't know

Dec 06 '22 01:12 ilgnefz

@Lililili-m Sorry, I don't know

It's a shame, I'm in a similar situation, when I create a sub window, occasionally the window goes white.

Dec 06 '22 01:12 Lililili-m

Hello, I'm having a similar issue, is there any solution or do you know the cause of this bug? @boyan01

Dec 06 '22 06:12 Lililili-m

is there any solution or do you know the cause of this bug?

Sorry, I don' known what happened in this case too.

It would be nice if someone could give some extra attention.

Dec 06 '22 11:12 boyan01

is there any solution or do you know the cause of this bug?

Sorry, I don' known what happened in this case too.

It would be nice if someone could give some extra attention.

Well, I tried using 'Future.delayed' before show sub window and it seems to work at first, but I found sometimes the window may have been white always and won't appear to normal even after a while. I don't know if it's the same cause, hope my description helps.

Dec 07 '22 03:12 Lililili-m