是否可以仅基于flex创建像这样的菜单栏布局？

问题描述

这是菜单栏的基本布局。

这是html：

import 'dart:math' as math;

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',theme: ThemeData(
        primarySwatch: Colors.blue,),home: Scaffold(
        body: SafeArea(
          child: MyHomePage(),);
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  ScrollController controller = ScrollController();
  @override
  Widget build(BuildContext context) {
    return CustomScrollView(
      physics: ClampingScrollPhysics(),controller: controller,slivers: [
        SliverAppBar(
          expandedHeight: 220.0,floating: true,pinned: true,snap: true,elevation: 50,backgroundColor: Colors.pink,leading: IconButton(
            icon: Icon(Icons.filter_1),onPressed: () {},flexibleSpace: _MyAppSpace(),SliverList(
          delegate: SliverChildListDelegate(
            List.generate(
              200,(index) => Card(
                child: Padding(
                  padding: EdgeInsets.all(10),child: Text('text $index'),)
      ],);
  }
}

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

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context,c) {
        final settings = context
            .dependOnInheritedWidgetOfExactType<FlexibleSpaceBarSettings>();
        final deltaExtent = settings.maxExtent - settings.minExtent;
        final t =
            (1.0 - (settings.currentExtent - settings.minExtent) / deltaExtent)
                .clamp(0.0,1.0) as double;
        final fadeStart = math.max(0.0,1.0 - kToolbarHeight / deltaExtent);
        const fadeEnd = 1.0;
        final opacity = 1.0 - Interval(fadeStart,fadeEnd).transform(t);

        return Opacity(
          opacity: opacity,child: Column(
            children: [
              Flexible(
                child: Container(
                  width: double.infinity,child: Image.network(
                    'https://images.pexels.com/photos/443356/pexels-photo-443356.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940',fit: BoxFit.cover,Padding(
                padding: const EdgeInsets.all(8.0),child: Text(
                  'Title',style: TextStyle(
                    color: Colors.white,fontSize: 26.0,fontWeight: FontWeight.bold,],);
      },);
  }
}

元素1将放置在最左侧，而元素2将放置在中间。目前，我使用flex和position来实现这种布局。但是我想知道是否可以在不使用position或grid的情况下创建这种布局。

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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flexbox layout