Graphs_dart/flutter/lib/pages/drawing_page.dart

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

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

Graphs getGraph() {
  List<Dot> d = <Dot>[];
  d.add(Dot.fromTwoLists("1", [2, 3], [5, 1]));
  d.add(Dot.fromTwoLists("2", [1, 3], [1, 1]));
  d.add(Dot.fromTwoLists("3", [1, 2], [1, 2]));
  d.add(Dot.fromTwoLists("Name1", [], []));
  d.add(Dot.fromTwoLists("Name2", [], []));
  return Graphs.fromList("1", d, true, true);
}

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 = getGraph();

  final _textNameController = TextEditingController();
  final _textNumbController = TextEditingController();
  final _textDestController = TextEditingController();
  final _textLnthController = TextEditingController();
  final _textGrNmController = TextEditingController();

  void clearTextControllers() {
    _textDestController.clear();
    _textNumbController.clear();
    _textLnthController.clear();
    _textNameController.clear();
  }

  @override
  Widget build(BuildContext context) {
    screenSize = MediaQuery.of(context).size.width;
    _textGrNmController.text = data.getName();
    return MaterialApp(
        home: Scaffold(
      appBar: AppBar(
          title: const Align(
              alignment: Alignment.topLeft,
              child: Text("Graph\n\n",
                  style: TextStyle(
                    fontSize: 18,
                    color: Colors.white,
                  ))),
          toolbarHeight: 110,
          flexibleSpace: Container(
            color: Colors.blue,
            child: Column(children: <Widget>[
              const SizedBox(height: 5),
              Row(children: [
                addSpaceW(screenSize / 8 + 21),
                createButton("\nAdd dot\n", addDotPushed),
                createInputBox("Dot name", screenSize / 4 - 25, Icons.label,
                    _textNameController),
                addSpaceW(18),
                createButton("\nDel dot \n", delDotPushed),
                createInputBox("Dot number", screenSize / 4 - 25,
                    Icons.fiber_manual_record, _textNumbController),
              ]),
              addSpaceH(3),
              Row(children: [
                createInputBox(
                    "Name", screenSize / 8 - 25, null, _textGrNmController),
                //addSpaceW(screenSize / 8 - 4),
                createButton("\nAdd path\n", addPathPushed),
                createInputBox("Input length", screenSize / 4 - 25,
                    Icons.arrow_right_alt_outlined, _textLnthController),
                addSpaceW(13),
                createButton("\nDel path\n", delPathPushed),
                createInputBox("Destination number", screenSize / 4 - 25,
                    Icons.fiber_manual_record, _textDestController),
              ]),
            ]),
          ),
          actions: [
            IconButton(
              onPressed: clearScreen,
              icon: const Icon(Icons.delete_sweep),
              iconSize: 60,
            ),
          ]),
      body: CustomPaint(
        painter: CurvePainter(gr: data),
        child: Align(
          alignment: Alignment.topRight,
          child: ButtonBar(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              createButton(data.getUseLengthStr(), changeLength),
              createButton(data.getDoubleSidedStr(), changeOriented),
              /*Text(_textGrNmController.text,
                  style:
                      TextStyle(fontSize: 15, color: Colors.blueGrey.shade900)),*/
              createButton("Save to file", fileSaver),
              createButton("Load from file", fileOpener),
            ],
          ),
        ),
      ),
    ));
  }

  // ignore: avoid_types_as_parameter_names, non_constant_identifier_names, use_function_type_syntax_for_parameters
  ElevatedButton createButton(String txt, void onPressing()) {
    return ElevatedButton(
      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) {
    if (icon == null) {
      return Container(
          width: wid,
          height: 40,
          margin: const EdgeInsets.symmetric(horizontal: 20, vertical: 5),
          child: TextField(
            controller: controller,
            textAlign: TextAlign.center,
            onChanged: (name) => data.setName(name),
            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),
          ));
    }
    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");
    //var inp = int.tryParse(_textNameController.text);
    setState(() {
      if (_textNameController.text == "") {
        showPopUp("Error", "No name in \"Dot name\" box");
      } else {
        String? res = data.addIsolated(_textNameController.text);
        if (res != null) {
          showPopUp("Error", res);
        }
      }
      clearTextControllers();
    });
  }

  void addPathPushed() {
    setState(() {
      if (_textNumbController.text == "") {
        showPopUp("Error", "No number in \"Dot number\" box");
      } else if (_textDestController.text == "") {
        showPopUp("Error", "No name in \"Dot name\" box");
      } else if (_textLnthController.text == "" && data.getUseLengthBool()) {
        showPopUp("Error", "No length in \"Input length\" box");
      } else {
        int? from = int.tryParse(_textNumbController.text);
        int? to = int.tryParse(_textDestController.text);
        int? len = int.tryParse(_textLnthController.text);
        if (from == null ||
            to == null ||
            (len == null && data.getUseLengthBool())) {
          showPopUp("Error",
              "Can't parse input.\nInts only allowed in \"Dot number\", \"Destination number\" and \"Input length\"");
        } else {
          if (data.getUseLengthBool() && len == null) len = 0;
          String? res = data.addPath(from, to, len!);
          if (res != null) {
            showPopUp("Error", res);
          }
        }
      }
      clearTextControllers();
    });
  }

  void addLenPushed() {
    //data.delDot()
    print(
        "${_textNumbController.text} -> ${_textDestController.text} = ${_textLnthController.text}");
    clearTextControllers();
  }

  void changeOriented() {
    setState(() {
      String? res = data.flipUseOrientation();
      if (res != null) showPopUp("Error", res);
    });
  }

  void changeLength() {
    setState(() {
      String? res = data.flipUseLength();
      if (res != null) showPopUp("Error", res);
    });
  }

  void delPathPushed() {
    setState(() {
      if (_textNumbController.text == "") {
        showPopUp("Error", "No number in \"Dot number\" box");
      } else if (_textDestController.text == "") {
        showPopUp("Error", "No name in \"Dot name\" box");
      } else {
        int? from = int.tryParse(_textNumbController.text);
        int? to = int.tryParse(_textDestController.text);
        if (from == null || to == null) {
          showPopUp("Error",
              "Can't parse input.\nInts only allowed in \"Dot number\" and \"Destination number\"");
        } else {
          String? res = data.delPath(from, to);
          if (res != null) {
            showPopUp("Error", res);
          }
        }
      }
      clearTextControllers();
    });
  }

  void delDotPushed() {
    setState(() {
      if (_textNumbController.text == "") {
        showPopUp("Error", "No number in \"Dot number\" box");
      } else {
        int? dot = int.tryParse(_textNumbController.text);
        if (dot == null) {
          showPopUp("Error", "Can't parse input.\nInts only allowed");
        } else {
          String? res = data.delDot(dot);
          if (res != null) {
            showPopUp("Error", res);
          }
        }
      }
      clearTextControllers();
    });
  }

  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 fileOpener() async {
    FilePickerResult? result =
        await FilePicker.platform.pickFiles(allowedExtensions: ["txt"]);
    setState(() {
      if (result != null) {
        if (!result.files.single.path!.endsWith(".txt")) {
          showPopUp("Error", "Can open only \".txt\" files");
        } else {
          //print(result.files.single.path!);
          String? res = data.replaceDataFromFile(result.files.single.path!);
          if (res != null) showPopUp("Error", res);
        }
      } else {
        showPopUp("Error", "No file selected");
        // User canceled the picker
      }
    });
  }

  void fileSaver() async {
    String? outputFile = await FilePicker.platform.saveFile(
        dialogTitle: 'Please select an output file:',
        fileName: 'output-file.txt',
        allowedExtensions: ["txt"]);
    if (outputFile == null) {
      showPopUp("Error", "Save cancelled");
      // User canceled the picker
    } else {
      if (!outputFile.endsWith(".txt")) {
        outputFile += ".txt";
      }
      data.printToFile(outputFile);
    }
  }

  void clearScreen() => data.flushData();
}