Работа кнопок, стрелки вместо линий, обработка ошибок в основном классе,

README.md

@@ -1,4 +1,7 @@
 CMD — реализация с коммандным интерфейсом
 
 
-FLUTTER — реализация с помощью Flutter
+FLUTTER — реализация с помощью Flutter
+
+
+Currently in work: Flutter. 

cmd/README.md

@@ -1 +1 @@
-Application to store graph data.
+Dart app to store string data in graph

cmd/outTest.txt

@@ -2,7 +2,7 @@
 НеОриентированный
 Взвешенный
 1: 1|10 2|11 3|10 4|10 
-2: 1|11 3|20 
+2: 1|11 
-3: 1|10 2|20 
+3: 
 4: 1|10 
 END

flutter/lib/curve_painter.dart

@@ -1,3 +1,4 @@
+import 'package:arrow_path/arrow_path.dart';
 import 'package:graphs/src/graph.dart';
 import 'package:flutter/material.dart';
 import 'dart:math';
@@ -22,17 +23,25 @@ class CurvePainter extends CustomPainter {
   void drawLine(Canvas canvas, Offset p1, Offset p2) {
     Paint p = Paint();
     p.color = col;
-    p.strokeWidth = width;
+    p.strokeWidth = width - 2;
     canvas.drawLine(p1, p2, p);
   }
 
   void drawDot(Canvas canvas, Offset p1) {
     var p = Paint();
     p.color = col;
-    p.strokeWidth = width + 1;
+    p.strokeWidth = width;
     canvas.drawCircle(p1, rad, p);
   }
 
+  void drawSelfConnect(Canvas canvas, Offset p1) {
+    var p = Paint();
+    p.color = col;
+    p.strokeWidth = width - 2;
+    p.style = PaintingStyle.stroke;
+    canvas.drawCircle(Offset(p1.dx + rad + 20, p1.dy), rad + 20, p);
+  }
+
   TextSpan _getTextSpan(String s) => TextSpan(text: s, style: textStyle);
   TextPainter _getTextPainter(String s) => TextPainter(
       text: _getTextSpan(s),
@@ -71,12 +80,37 @@ class CurvePainter extends CustomPainter {
     return off;
   }
 
+  void drawArrow(Canvas canvas, Offset from, Offset to,
+      [bool doubleSided = false]) {
+    Path path;
+
+    // The arrows usually looks better with rounded caps.
+    Paint paint = Paint()
+      ..color = Colors.black
+      ..style = PaintingStyle.stroke
+      ..strokeCap = StrokeCap.round
+      ..strokeJoin = StrokeJoin.round
+      ..strokeWidth = width - 1;
+
+    /// Draw a single arrow.
+  path = Path();
+    path.moveTo(from.dx, from.dy);
+    path.relativeCubicTo(0, 0, 0, 0, to.dx - from.dx, to.dy - from.dy);
+    path =
+        ArrowPath.make(path: path, isDoubleSided: doubleSided, tipLength: 13);
+    canvas.drawPath(path, paint);
+  }
+
   void drawConnections(Canvas canvas, List<Dot> dots, Map<int, Offset> off) {
     for (var i in dots) {
       var list = i.getL();
       var beg = off[i.num];
       for (var d in list.keys) {
-        drawLine(canvas, beg!, off[d]!);
+        if (d == i.num) {
+          drawSelfConnect(canvas, off[d]!);
+        } else {
+          drawArrow(canvas, beg!, off[d]!, !gr.getDoubleSidedBool());
+        }
       }
     }
   }
@@ -88,7 +122,7 @@ class CurvePainter extends CustomPainter {
     } else {
       circleRad = size.width / 3;
     }
-    var paint = Paint();
+    //var paint = Paint();
     //drawLine(canvas, Offset(0, size.height / 2),
     //Offset(size.width, size.height / 2));
 
@@ -100,13 +134,8 @@ class CurvePainter extends CustomPainter {
           canvas, off[i + 1]!, "${gr.getDots()[i].getName()}:[${i + 1}]");
     }
     drawConnections(canvas, gr.getDots(), off);
-
+    //drawArrow(canvas, Offset(size.width / 2, size.height / 2),
-    paint.color = Colors.blue;
+    //   Offset(size.width / 2 + 50, size.height / 2 + 200));
-    paint.style = PaintingStyle.stroke;
-    //drawDot(canvas, Offset(size.width / 2, size.height / 2));
-    //drawAboveText(canvas, size, "sssssssssssss");
-    //_drawTextAt("Assss", Offset(size.width / 2, size.height / 2), canvas);
-    paint.color = Colors.green;
   }
 
   @override

flutter/lib/pages/drawing_page.dart

@@ -11,7 +11,7 @@ Graphs getGraph() {
   d.add(Dot.fromTwoLists("3", [1, 2], [1, 1]));
   d.add(Dot.fromTwoLists("Name1", [], []));
   d.add(Dot.fromTwoLists("Name2", [], []));
-  return Graphs.fromList("1", d, false, false);
+  return Graphs.fromList("1", d, false, true);
 }
 
 class DrawingPage extends StatefulWidget {
@@ -29,6 +29,7 @@ class _DrawingPageState extends State<DrawingPage> {
   final _textNumbController = TextEditingController();
   final _textDestController = TextEditingController();
   final _textLnthController = TextEditingController();
+  final _textGrNmController = TextEditingController();
 
   void clearTextControllers() {
     _textDestController.clear();
@@ -40,29 +41,37 @@ class _DrawingPageState extends State<DrawingPage> {
   @override
   Widget build(BuildContext context) {
     screenSize = MediaQuery.of(context).size.width;
+    _textGrNmController.text = data.getName();
     return MaterialApp(
         home: Scaffold(
       appBar: AppBar(
-          title: const Text("Graph",
+          title: const Align(
-              style: TextStyle(fontSize: 30, color: Colors.white)),
+              alignment: Alignment.topLeft,
-          toolbarHeight: 110, // Set this height
+              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),
+                addSpaceW(screenSize / 8 + 21),
                 createButton("\nAdd dot\n", addDotPushed),
                 createInputBox("Dot name", screenSize / 4 - 25, Icons.label,
                     _textNameController),
-                addSpaceW(20),
+                addSpaceW(18),
                 createButton("\nDel dot \n", delDotPushed),
                 createInputBox("Dot number", screenSize / 4 - 25,
                     Icons.fiber_manual_record, _textNumbController),
               ]),
               addSpaceH(3),
               Row(children: [
-                addSpaceW(screenSize / 8 - 4),
+                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),
@@ -87,7 +96,12 @@ class _DrawingPageState extends State<DrawingPage> {
           child: ButtonBar(
             mainAxisSize: MainAxisSize.min,
             children: <Widget>[
-              createButton("Save to file", () {}),
+              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),
             ],
           ),
@@ -109,8 +123,29 @@ class _DrawingPageState extends State<DrawingPage> {
     );
   }
 
-  Container createInputBox(String text, double wid, IconData icon,
+  Container createInputBox(String text, double wid, IconData? icon,
-      TextEditingController controller) {
+      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,
@@ -142,56 +177,46 @@ class _DrawingPageState extends State<DrawingPage> {
   void addDotPushed() {
     //showPopUp("Test", "Test message");
     //var inp = int.tryParse(_textNameController.text);
-    if (_textNameController.text == "") {
+    setState(() {
-      showPopUp("Error", "No name in \"Dot name\" box");
+      if (_textNameController.text == "") {
-    } else {
+        showPopUp("Error", "No name in \"Dot name\" box");
-      String? res = data.addIsolated(_textNameController.text);
-      if (res != null) {
-        showPopUp("Error", res);
-      }
-    }
-    clearTextControllers();
-  }
-
-  void addPathPushed() {
-    if (_textDestController.text == "") {
-      showPopUp("Error", "No name in \"Dot name\" box");
-    } else {
-      String? res = data.addIsolated(_textNameController.text);
-      if (res != null) {
-        showPopUp("Error", res);
-      }
-    }
-    clearTextControllers();
-  }
-
-  void delPathPushed() {
-    if (_textDestController.text == "") {
-      showPopUp("Error", "No name in \"Dot name\" box");
-    } else {
-      String? res = data.addIsolated(_textNameController.text);
-      if (res != null) {
-        showPopUp("Error", res);
-      }
-    }
-    clearTextControllers();
-  }
-
-  void delDotPushed() {
-    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);
+        String? res = data.addIsolated(_textNameController.text);
         if (res != null) {
           showPopUp("Error", res);
         }
       }
-    }
+      clearTextControllers();
-    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() {
@@ -201,6 +226,62 @@ class _DrawingPageState extends State<DrawingPage> {
     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(
@@ -216,14 +297,34 @@ class _DrawingPageState extends State<DrawingPage> {
       );
 
   void fileOpener() async {
-    FilePickerResult? result = await FilePicker.platform.pickFiles();
+    FilePickerResult? result =
+        await FilePicker.platform.pickFiles(allowedExtensions: ["txt"]);
+    setState(() {
+      if (result != null) {
+        //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
+      }
+    });
+  }
 
-    if (result != null) {
+  void fileSaver() async {
-      print(result.files.single.path!);
+    String? outputFile = await FilePicker.platform.saveFile(
-      data.replaceDataFromFile(result.files.single.path!);
+        dialogTitle: 'Please select an output file:',
-    } else {
+        fileName: 'output-file.txt',
-      showPopUp("Error", "No file selected");
+        allowedExtensions: ["txt"]);
+
+    if (outputFile == null) {
+      showPopUp("Error", "Save cancelled");
       // User canceled the picker
+    } else {
+      if (!outputFile.endsWith(".txt")) {
+        outputFile += ".txt";
+      }
+      data.printToFile(outputFile);
     }
   }
 

flutter/lib/src/graph.dart

@@ -1,15 +1,15 @@
 import 'dart:io';
 
 class Separators {
-  final String dotToConnections = ": ";
+  static const String dotToConnections = ": ";
-  final String dotToLength = "|";
+  static const String dotToLength = "|";
-  final String space = " ";
+  static const String space = " ";
-  final String hasLength = "Взвешенный\n";
+  static const String hasLength = "Взвешенный";
-  final String hasNoLength = "НеВзвешенный\n";
+  static const String hasNoLength = "НеВзвешенный";
-  final String isOriented = "Ориентированный\n";
+  static const String isOriented = "Ориентированный";
-  final String isNotOriented = "НеОриентированный\n";
+  static const String isNotOriented = "НеОриентированный";
-  final String nL = "\n";
+  static const String nL = "\n";
-  final String end = "END";
+  static const String end = "END";
 
   Separators();
 }
@@ -25,6 +25,7 @@ class Dot {
   String getName() => _name;
   bool hasConnection(int n) => _ln.containsKey(n);
   Map<int, int> getL() => _ln;
+
   int getLength(int x) {
     if (hasConnection(x)) {
       return _ln[x]!;
@@ -146,15 +147,15 @@ class Graphs {
   //*********************Add************************
 
   //*********Delete*********
-  bool delPath(int from, int to) {
+  String? delPath(int from, int to) {
     if (from <= 0 || from > _amount || to <= 0 && to > _amount) {
-      return false;
+      return "Can't find specified path";
     }
     _dots[from - 1].delPath(to);
     if (!_oriented) {
       _dots[to - 1].delPath(from);
     }
-    return true;
+    return null;
   }
 
   String? delDot(int inn) {
@@ -175,7 +176,11 @@ class Graphs {
     return null;
   }
 
-  void flushData() => _dots = <Dot>[];
+  void flushData() {
+    _dots = <Dot>[];
+    _amount = 0;
+    _nameTable = <int, String>{};
+  }
   //*********Delete*********
 
   //******Helper*******
@@ -246,50 +251,115 @@ class Graphs {
 
   //*****Setters*******
   void setName(String name) => _name = name;
+  String? flipUseOrientation() {
+    if (_amount != 0) {
+      return "Can change use of orientation only in empty graph";
+    }
+    _oriented = !_oriented;
+    return null;
+  }
+
+  String? flipUseLength() {
+    if (_amount != 0) {
+      return "Can change use of length only in empty graph";
+    }
+    _useLength = !_useLength;
+    return null;
+  }
+
   String? replaceDataFromFile(String path) {
-    Separators sep = Separators();
     File file = File(path);
     List<String> lines = file.readAsLinesSync();
-    _name = lines.removeAt(0);
+    if (lines.length < 3) {
-    _oriented = lines.removeAt(0) == sep.isOriented.trim();
+      return "Not enough lines in file";
-    _useLength = lines.removeAt(0) == sep.hasLength.trim();
+    }
-    _dots = <Dot>[];
+    String name = lines.removeAt(0);
+    bool oriented;
+    switch (lines.removeAt(0)) {
+      case Separators.isOriented:
+        oriented = true;
+        break;
+      case Separators.isNotOriented:
+        oriented = false;
+        break;
+      default:
+        return "Error on parsing \"IsOriented\"";
+    }
+    bool useLength;
+    switch (lines.removeAt(0).trim()) {
+      case Separators.hasLength:
+        useLength = true;
+        break;
+      case Separators.hasNoLength:
+        useLength = false;
+        break;
+      default:
+        return "Error on parsing \"HasLength\"";
+    }
+    List<Dot> dots = <Dot>[];
     for (var l in lines) {
       l = l.trimRight();
-      if (l != sep.end) {
+      if (l != Separators.end) {
-        var spl = l.split(sep.space);
+        var spl = l.split(Separators.space);
         List<int> dot = <int>[];
         List<int> len = <int>[];
         String name = spl.removeAt(0);
         name = name.substring(0, name.length - 1);
         for (var splitted in spl) {
           if (splitted != "") {
-            var dt = splitted.split(sep.dotToLength);
+            var dt = splitted.split(Separators.dotToLength);
             if (dt.length == 2) {
-              dot.add(int.parse(dt[0]));
+              int? parsed = int.tryParse(dt[0]);
-              if (_useLength) {
+              if (parsed == null) {
-                len.add(int.parse(dt[1]));
+                return "Error while parsing file\nin parsing int in \"${dt[0]}\"";
+              }
+              dot.add(parsed);
+              if (useLength) {
+                parsed = int.tryParse(dt[1]);
+                if (parsed == null) {
+                  return "Error while parsing file\nin parsing int in \"${dt[1]}\"";
+                }
+                len.add(parsed);
               } else {
                 len.add(0);
               }
             } else if (dt.length == 1) {
-              dot.add(int.parse(splitted));
+              int? parsed = int.tryParse(splitted);
+              if (parsed == null) {
+                return "Error while parsing file\nin parsing int in \"$splitted\"";
+              }
+              dot.add(parsed);
               len.add(0);
             }
           }
         }
-        _dots.add(Dot.fromTwoLists(name, dot, len));
+        dots.add(Dot.fromTwoLists(name, dot, len));
       }
     }
+    _name = name;
+    _oriented = oriented;
+    _useLength = useLength;
+    _dots = dots;
     _syncNum();
     _syncNameTable();
     if (!_oriented) _fullFix();
+    return null;
   }
   //*****Setters*******
 
   //*****Getters*******
-  bool getDoubleSided() => _oriented;
+  bool getDoubleSidedBool() => _oriented;
-  bool getUseLength() => _useLength;
+  String getDoubleSidedStr() {
+    if (_oriented) return Separators.isOriented;
+    return Separators.isNotOriented;
+  }
+
+  bool getUseLengthBool() => _useLength;
+  String getUseLengthStr() {
+    if (_useLength) return Separators.hasLength;
+    return Separators.hasNoLength;
+  }
+
   List<Dot> getDots() => _dots;
   String getName() => _name;
   String? getNameByNum(int n) => _nameTable[n];
@@ -349,31 +419,34 @@ class Graphs {
   }
 
   void printToFile(String name) {
-    Separators sep = Separators();
     var file = File(name);
     file.writeAsStringSync("$_name\n");
     if (_oriented) {
-      file.writeAsStringSync(sep.isOriented, mode: FileMode.append);
+      file.writeAsStringSync("${Separators.isOriented}\n",
+          mode: FileMode.append);
     } else {
-      file.writeAsStringSync(sep.isNotOriented, mode: FileMode.append);
+      file.writeAsStringSync("${Separators.isNotOriented}\n",
+          mode: FileMode.append);
     }
     if (_useLength) {
-      file.writeAsStringSync(sep.hasLength, mode: FileMode.append);
+      file.writeAsStringSync("${Separators.hasLength}\n",
+          mode: FileMode.append);
     } else {
-      file.writeAsStringSync(sep.hasNoLength, mode: FileMode.append);
+      file.writeAsStringSync("${Separators.hasNoLength}\n",
+          mode: FileMode.append);
     }
     for (int i = 0; i < _amount; i++) {
-      file.writeAsStringSync((i + 1).toString() + sep.dotToConnections,
+      file.writeAsStringSync((i + 1).toString() + Separators.dotToConnections,
           mode: FileMode.append);
       var d = _dots[i].getL();
       for (var j in d.keys) {
         file.writeAsStringSync(
-            j.toString() + sep.dotToLength + d[j].toString() + " ",
+            j.toString() + Separators.dotToLength + d[j].toString() + " ",
             mode: FileMode.append);
       }
-      file.writeAsStringSync(sep.nL, mode: FileMode.append);
+      file.writeAsStringSync(Separators.nL, mode: FileMode.append);
     }
-    file.writeAsStringSync(sep.end, mode: FileMode.append);
+    file.writeAsStringSync(Separators.end, mode: FileMode.append);
   }
   //******Print******
 
@@ -399,22 +472,22 @@ class Graphs {
     if (!_oriented) _fullFix();
   }
   Graphs.fromFile(String path) {
-    Separators sep = Separators();
+    replaceDataFromFile(path);
-    File file = File(path);
+    /*File file = File(path);
     List<String> lines = file.readAsLinesSync();
     _name = lines.removeAt(0);
-    _oriented = lines.removeAt(0) == sep.isOriented.trim();
+    _oriented = lines.removeAt(0) == Separators.isOriented.trim();
-    _useLength = lines.removeAt(0) == sep.hasLength.trim();
+    _useLength = lines.removeAt(0) == Separators.hasLength.trim();
     _dots = <Dot>[];
     for (var l in lines) {
-      if (l != sep.end) {
+      if (l != Separators.end) {
-        var spl = l.split(sep.space);
+        var spl = l.split(Separators.space);
         List<int> dot = <int>[];
         List<int> len = <int>[];
         String name = spl.removeAt(0);
         name = name.substring(0, name.length - 1);
         for (var splitted in spl) {
-          var dt = splitted.split(sep.dotToLength);
+          var dt = splitted.split(Separators.dotToLength);
           if (dt.length == 2) {
             dot.add(int.parse(dt[0]));
             if (_useLength) {
@@ -432,7 +505,7 @@ class Graphs {
     }
     _syncNum();
     _syncNameTable();
-    if (!_oriented) _fullFix();
+    if (!_oriented) _fullFix();*/
   }
   //*******Constructor********
 
@@ -440,8 +513,8 @@ class Graphs {
   Graphs.clone(Graphs a) {
     _name = a.getName();
     _dots = a.getDots();
-    _oriented = a.getDoubleSided();
+    _oriented = a.getDoubleSidedBool();
-    _useLength = a.getUseLength();
+    _useLength = a.getUseLengthBool();
     _amount = _dots.length;
     _syncNameTable();
   }

flutter/pubspec.lock

@@ -1,6 +1,13 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  arrow_path:
+    dependency: "direct main"
+    description:
+      name: arrow_path
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   async:
     dependency: transitive
     description:

flutter/pubspec.yaml

@@ -30,6 +30,7 @@ dependencies:
   flutter:
     sdk: flutter
   file_picker: ^4.2.0
+  arrow_path: ^2.0.0 
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.