Dart 在构建函数之外使用 BuildContext

我有一个函数，可以构建一个小部件来重用它，我想在这个函数中设置文本主题.我的问题是，要做到这一点，我需要访问BuildContext.我能想到的唯一方法是在每次函数调用中将其作为参数传递，但感觉必须有一个更简单的方法.还是这是最好的方法？

以下是当前代码:

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

import 'package:snapping_page_scroll/snapping_page_scroll.dart';

void main() => runApp(MaterialApp(
      theme: ThemeData(
        backgroundColor: Color(0xff121217),
         textTheme: TextTheme(
           headline: TextStyle(fontSize: 40)
         )
      ),
      home: SplashScreen(),
    ));

class SplashScreen extends StatefulWidget {
  @override
  _SplashScreenState createState() => _SplashScreenState();
}

class _SplashScreenState extends State<SplashScreen> {
  @override
  void initState() {
    super.initState();
    loadData();
  }

  //Simulates loading of data
  Future<Timer> loadData() async {
    return new Timer(Duration(seconds: 1), onDoneLoading);
  }

  onDoneLoading() async {
    Navigator.of(context).push(MaterialPageRoute(builder: (context) => Home()));
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Color(0xff121217),
      child: Padding(
        padding: const EdgeInsets.all(20),
        child: Image.asset('assets/logo.png'),
      ),
    );
  }
}

class Home extends StatelessWidget {

  Widget page(text, color, context){
    return Container(
      color: color,
      child: Align(
        alignment: Alignment(0, 0.5),
        child: Text(text, style: Theme.of(context).textTheme.headline,),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(),
        body: SnappingPageScroll(
          children: <Widget>[
            page('Page 1', Colors.orange, context),
            page('Page 2', Colors.green, context),
          ],
        ),
      ),
    );
  }
}