Graphs_dart/flutter/lib/pages/drawing_page.dart

import 'dart:io';
import 'dart:math';

import 'package:graphs/curve_painter.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:graphs/src/graph.dart';

class DrawingPage extends StatefulWidget {
  const DrawingPage({Key? key}) : super(key: key);

  @override
  State<StatefulWidget> createState() => _DrawingPageState();
}

class _DrawingPageState extends State<DrawingPage> {
  double screenSize = 0;
  Graphs data = Graphs("Data");

  final _textDot1Controller = TextEditingController();
  final _textDot2Controller = TextEditingController();
  final _textLenController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    screenSize = MediaQuery.of(context).size.width;
    return MaterialApp(
        home: Scaffold(
      appBar: AppBar(
          title: const Text("Graph",
              style: TextStyle(fontSize: 35, color: Colors.white)),
          toolbarHeight: 110, // Set this height
          flexibleSpace: Container(
            color: Colors.blue,
            child: Column(children: <Widget>[
              const SizedBox(height: 5),
              Row(children: [
                addSpaceW(screenSize / 4 - 20),
                createInputBox("Input dot1 number", screenSize / 4 - 5,
                    Icons.fiber_manual_record, _textDot1Controller),
                //addSpaceW(4),
                createInputBox("Input dot2 number", screenSize / 4 - 5,
                    Icons.fiber_manual_record, _textDot2Controller),
              ]),
              addSpaceH(3),
              createInputBox("Input path length", screenSize / 3 + 30,
                  Icons.arrow_right_alt_outlined, _textLenController),
            ]),
          ),
          actions: [
            Column(
              children: [
                addSpaceH(10),
                createButton("\nAdd dot\n", addDotPushed),
                addSpaceH(3),
                createButton("\nDel dot \n", addLenPushed),
              ],
            ),
            IconButton(
              onPressed: () => closeApp(),
              icon: const Icon(Icons.close),
              iconSize: 50,
            ),
          ]),
      body: CustomPaint(
        painter: CurvePainter(Graphs()),
        child: const Center(),
      ),
    ));
  }

  // ignore: avoid_types_as_parameter_names, non_constant_identifier_names, use_function_type_syntax_for_parameters
  ElevatedButton createButton(String txt, void onPressing()) {
    return ElevatedButton(
      /*style: TextButton.styleFrom(
        primary: Colors.blue,
      ),*/
      onPressed: onPressing,
      child: Text(txt,
          style: const TextStyle(
            fontSize: 15,
            color: Colors.white,
            height: 1,
          )),
    );
  }

  Container createInputBox(String text, double wid, IconData icon,
      TextEditingController controller) {
    return Container(
        width: wid,
        height: 40,
        margin: const EdgeInsets.symmetric(horizontal: 20, vertical: 5),
        child: TextField(
          controller: controller,
          textAlign: TextAlign.center,
          decoration: InputDecoration(
              contentPadding:
                  const EdgeInsets.symmetric(vertical: 10, horizontal: 10),
              filled: true,
              fillColor: Colors.white,
              prefixIcon: Icon(icon, color: Colors.black),
              border: const OutlineInputBorder(
                  borderRadius: BorderRadius.all(Radius.circular(40))),
              hintStyle: const TextStyle(color: Colors.black38),
              hintText: text),
        ));
  }

  SizedBox addSpaceH(double h) {
    return SizedBox(height: h);
  }

  SizedBox addSpaceW(double w) {
    return SizedBox(width: w);
  }

  void addDotPushed() {
    showPopUp("Test", "Test message");
    print(_textDot1Controller.text);
    _textDot1Controller.clear();
  }

  void addLenPushed() {
    print(
        "${_textDot1Controller.text} -> ${_textDot2Controller.text} = ${_textLenController.text}");
    _textDot1Controller.clear();
    _textDot2Controller.clear();
    _textLenController.clear();
  }

  void showPopUp(String alertTitle, String err) => showDialog<String>(
        context: context,
        builder: (BuildContext context) => AlertDialog(
          title: Text(alertTitle),
          content: Text(err),
          actions: <Widget>[
            TextButton(
              onPressed: () => Navigator.pop(context, 'OK'),
              child: const Text('OK'),
            ),
          ],
        ),
      );

  void closeApp() {
    if (Platform.isWindows) {
      exit(0);
    }
    SystemChannels.platform.invokeMethod('SystemNavigator.pop');
  }
}