flutter syntax view template

/*********************
 * main.dart
 *********************/
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import './home.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized(); 

  // don't switch to landscape
  // only portrait
  SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown]);
  runApp(MyApp());}
  
class MyApp extends StatelessWidget{
  MyApp({super.key});
  @override Widget build(BuildContext context){
    return GetMaterialApp(
      title: 'Flutter Template',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        useMaterial3: true),
        //colorSchemeSeed: Color(0x9f4376f8)),
        home: Home());}}
        
/*************
 * home.dart
 *************/
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import './screen1.dart';
import './help.dart';
import './source.dart';
import './data.dart';

class Home extends StatelessWidget{

@override Widget build(BuildContext context){
  return Scaffold(
  appBar:AppBar(title: Text('Flutter Template')),
  drawer: Drawer(child: ListView(children: [
  
    ListTile(title: Text('Screen1'),
      onTap:() {Get.to(Screen1());}),
      
    ListTile(title: Text('Help'),
      onTap:()=> Navigator.of(context).push(Help())),

    ListTile(title: Text('Source'),
      onTap:() {Get.to(Source());}), 
      
    ListTile(title: Text('Exit'),
      onTap:(){ SystemNavigator.pop(); })])),
      
  body: Center(child: Text(homeData)));}}
  
/***************
 * screen1.dart
 ***************/
import 'package:flutter/material.dart';
import 'package:get/get.dart';

class Screen1 extends StatelessWidget {
   Screen1({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(appBar:AppBar(title:Text('Screen1')),
        body: Center(child: Text('Screen1')));}}
        
/***************
 * source.dart
 ***************/
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:flutter_syntax_view/flutter_syntax_view.dart';
import 'dart:async';
import 'dart:io';
import 'dart:convert';
import './codes.dart';

// function to show source code
Widget showSource(String code, BuildContext context){
  num line = LineSplitter().convert(code).length;
  return  SizedBox(height:16.0 * line, child:SyntaxView(
      code: code,
      syntax: Syntax.DART,
      syntaxTheme: SyntaxTheme.vscodeDark(),
      withZoom:true,
      withLinesCount:true,
      expanded:true));}

class Source extends StatelessWidget{

@override Widget build(BuildContext context) {
return Scaffold(appBar:AppBar(title: Text('Source Code')),
body: SingleChildScrollView(child:Column(children:[

for (var i=0; i<codes.length; i++) Column(children:[
    showSource(codes[i], context),
    SizedBox(height:40)])])));}}
    
/****************
 * help.dart
 ****************/
import 'package:flutter/material.dart';
import './data.dart';

class Help extends MaterialPageRoute<void>{
  Help() : super(builder: (BuildContext context){
    return Scaffold(
      appBar: AppBar(title: Text('Help')),
      body: Center(child: Text(helpData)));});}
      
/***************
 * data.dart
 ***************/
 
String homeData = '''

Home Screen

This is a flutter template with
source code view, touch the drawer
on the upper left hand of the
screen for more info.

''';

String helpData = '''

Help Screen

The format for codes.dart starts with

List<String> codes = [

3 single quotes
  content of main.dart
3 single quotes comma

3 single quotes
  content home.dart
3 single quotes comma

repeat pattern for every source code  

];

''';

/*****************
 * codes.dart
 *****************/
// main.dart
// home.dart
// source.dart
// help.dart
// screen1.dart

List<String> codes = [

///////////////////////////////////
// main.dart
'''
/*********************
 * main.dart
 *********************/
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import './home.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized(); 

  // don't switch to landscape
  // only portrait
  SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown]);
  runApp(MyApp());}
  
class MyApp extends StatelessWidget{
  MyApp({super.key});
  @override Widget build(BuildContext context){
    return GetMaterialApp(
      title: 'Flutter Template',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        useMaterial3: true),
        //colorSchemeSeed: Color(0x9f4376f8)),
        home: Home());}}
''',

////////////////////////////////////////////
// home.dart
'''
/*************
 * home.dart
 *************/
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import './screen1.dart';
import './help.dart';
import './source.dart';
import './data.dart';

class Home extends StatelessWidget{

@override Widget build(BuildContext context){
  return Scaffold(
  appBar:AppBar(title: Text('Flutter Template')),
  drawer: Drawer(child: ListView(children: [
  
    ListTile(title: Text('Screen1'),
      onTap:() {Get.to(Screen1());}),
      
    ListTile(title: Text('Help'),
      onTap:()=> Navigator.of(context).push(Help())),

    ListTile(title: Text('Source'),
      onTap:() {Get.to(Source());}), 
      
    ListTile(title: Text('Exit'),
      onTap:(){ SystemNavigator.pop(); })])),
      
  body: Center(child: Text(homeData)));}}
''',

//////////////////////////////////////
// source.dart
'''
/***************
 * source.dart
 ***************/
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:flutter_syntax_view/flutter_syntax_view.dart';
import 'dart:async';
import 'dart:io';
import 'dart:convert';
import './codes.dart';

// function to show source code
Widget showSource(String code, BuildContext context){
  num line = LineSplitter().convert(code).length;
  return  SizedBox(height:16.0 * line, child:SyntaxView(
      code: code,
      syntax: Syntax.DART,
      syntaxTheme: SyntaxTheme.vscodeDark(),
      withZoom:true,
      withLinesCount:true,
      expanded:true));}

class Source extends StatelessWidget{

@override Widget build(BuildContext context) {
return Scaffold(appBar:AppBar(title: Text('Source Code')),
body: SingleChildScrollView(child:Column(children:[

for (var i=0; i<codes.length; i++) Column(children:[
    showSource(codes[i], context),
    SizedBox(height:40)])])));}}
''',

////////////////////////////////////
// help.dart

'''
/****************
 * help.dart
 ****************/
import 'package:flutter/material.dart';
import './data.dart';

class Help extends MaterialPageRoute<void>{
  Help() : super(builder: (BuildContext context){
    return Scaffold(
      appBar: AppBar(title: Text('Help')),
      body: Center(child: Text(helpData)));});}

''',

////////////////////////////
// screen1.dart
'''
mport 'package:flutter/material.dart';
import 'package:get/get.dart';

class Screen1 extends StatelessWidget {
   Screen1({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(appBar:AppBar(title:Text('Screen1')),
        body: Center(child: Text('Screen1')));}}
''',

];