fis_lib_report/lib/main.dart

import 'dart:convert';

import 'package:fis_lib_report/pages/block_element_page.dart';
import 'package:fis_lib_report/report/interfaces/block_element.dart';
import 'package:fis_lib_report/report/report_template_document.dart';
import 'package:fis_lib_report/report/rt_thickness.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

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

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  ReportTemplateDocument _reportTemplate = ReportTemplateDocument();
  double _height = 0;
  double _width = 0;
  List<IBlockElement> _blocks = [];
  List<IBlockElement> _header = [];
  List<IBlockElement> _footer = [];
  double _baseFontSize = 9.0;
  double _footerDistance = 34.0;
  double _footerHeight = 0;
  EdgeInsetsGeometry _padding = const EdgeInsets.all(56.83);
  @override
  initState() {
    _intitTemplate();

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        decoration: _buildDecoration(),
        padding: _padding,
        height: _height * 2,
        width: _width * 1.5,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          mainAxisAlignment: MainAxisAlignment.start,
          children: [
            ..._header.map((head) {
              return BlockElementPage(element: head);
            }),
            ..._blocks.map((block) {
              return BlockElementPage(element: block);
            }),
            const SizedBox(height: 10),
            ..._footer.map((footer) {
              return BlockElementPage(element: footer);
            }),
          ],
        ),
      ),
    );
  }

  BoxDecoration _buildDecoration() {
    return BoxDecoration(
        border: Border.all(
          width: 0.5,
          color: const Color.fromARGB(255, 83, 83, 83),
        ),
        color: Colors.grey[200]);
  }

  void _intitTemplate() {
    rootBundle.loadString('assets/default.json').then((jsonStr) {
      final reportMap = jsonDecode(jsonStr);
      final template = ReportTemplateDocument.fromJson(reportMap);
      _reportTemplate = template;
      setState(() {
        _initPage();
      });
    });
  }

  void _initPage() {
    try {
      _height = _reportTemplate.pageSize!.height ?? 841;
      _width = _reportTemplate.pageSize!.width ?? 595;
      _baseFontSize = _reportTemplate.baseFontSize ?? 14;
      _footerDistance = _reportTemplate.footerDistance ?? 0;
      _footerHeight = _reportTemplate.footerHeight ?? 0;
      final pagePadding =
          _reportTemplate.pagePadding ?? RTThickness.uniform(56);
      _padding = EdgeInsets.only(
        left: pagePadding.left ?? 0,
        right: pagePadding.right ?? 0,
        top: pagePadding.top ?? 0,
        bottom: pagePadding.bottom ?? 0,
      );
      _footer = _reportTemplate.footer ?? [];
      _blocks = _reportTemplate.blocks ?? [];
      _header = _reportTemplate.header ?? [];
    } catch (e) {
      _height = 841.8897637795275;
      _width = 595.275590551181;
    }
  }
}