How to set default size of macos app in flutter?

问题

I am trying to build a macOS desktop app with flutter. I want the app to be full-width, edge-to-edge. However, when I run the app via the simulator, or after the build, it always launches the app with size 800x600.

I have set the height and width of the root container to double.infinity. In fact, even if I set the height and width to 10.0, it always launches the app with 800x600. I am new to flutter, so probably missing some fundamentals. Most tutorials I have come across talk about building a mobile app where this is never a problem because the app always launches to its full width.

Here is my entire test app code:

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(color: Colors.white),
      height: double.infinity,
      width: double.infinity,
      child: Center(
        child: Text(
          'Hello World',
          textDirection: TextDirection.ltr,
          style: TextStyle(
              fontSize: 32, fontWeight: FontWeight.bold, color: Colors.black),
        ),
      ),
    );
  }
}

回答1:

Currently the only way to control the initial size is in native code (follow these issues: 1 and 2 to find out when that changes). You'd most likely want to set it in macos/Runner/MainFlutterWindow.swift.

It's not clear from your description whether you want to launch into full-screen mode, or just have a standard window the size of the client area of the screen; the code involved would be different depending on which you are trying to accomplish.

回答2:

There's now a plugin to do this, which is not a permanent thing as it is described as preliminary functionality before eventually being folded into the core libraries.

Using the plugin for now is still likely to be better than hard-coding directly modifying the native code, especially if you have multiple platforms you want to work on.

First add to the pubspec.yaml something like:

dependencies:
  ...
  window_size:
    git:
      url: git://github.com/google/flutter-desktop-embedding.git
      path: plugins/window_size
      ref: 955da3da17a0dfcf32ae00bd65fadd7af294cb86

Using the specific Git reference to include this, as shown above, will give you good control over when you choose to pull updated code and make any changes this might entail.

You can then access various functions to set min/max window sizes, or frame, or get the current values, e.g.:

...
import 'dart:io'
import 'package:window_size/window_size.dart';
...
void main() {
  WidgetsFlutterBinding.ensureInitialized();
  if (Platform.isWindows || Platform.isLinux || Platform.isMacOS) {
    setWindowTitle("My Desktop App");
    setWindowMinSize(Size(375, 750));
    setWindowMaxSize(Size(600, 1000));
  }
  runApp(MyApp());
}

I hope this helps someone. I'll try and update this post when the real answer comes out. It seems likely that the interface will approximate what is presented in this library, but the feature set is likely to undergo some change.

来源：https://stackoverflow.com/questions/61451163/how-to-set-default-size-of-macos-app-in-flutter

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