FL:Del dot working

GR:DelDot return error string

flutter/lib/pages/drawing_page.dart

@@ -27,12 +27,12 @@ class _DrawingPageState extends State<DrawingPage> {
   Graphs data = getGraph();
 
   final _textNameController = TextEditingController();
-  final _textInptController = TextEditingController();
+  final _textNumbController = TextEditingController();
   final _textDistController = TextEditingController();
   final _textLnthController = TextEditingController();
   void clearTextControllers() {
     _textDistController.clear();
-    _textInptController.clear();
+    _textNumbController.clear();
     _textLnthController.clear();
     _textNameController.clear();
   }
@@ -51,14 +51,14 @@ class _DrawingPageState extends State<DrawingPage> {
             child: Column(children: <Widget>[
               const SizedBox(height: 5),
               Row(children: [
-                addSpaceW(screenSize / 8 - 20),
+                addSpaceW(screenSize / 8),
                 createButton("\nAdd dot\n", addDotPushed),
                 createInputBox("Dot name", screenSize / 4 - 25, Icons.label,
                     _textNameController),
                 addSpaceW(20),
                 createButton("\nDel dot \n", delDotPushed),
                 createInputBox("Dot number", screenSize / 4 - 25,
-                    Icons.fiber_manual_record, _textInptController),
+                    Icons.fiber_manual_record, _textNumbController),
               ]),
               addSpaceH(3),
               Row(children: [
@@ -69,27 +69,27 @@ class _DrawingPageState extends State<DrawingPage> {
                 createInputBox("Input length", screenSize / 4 - 5,
                     Icons.arrow_right_alt_outlined, _textLnthController),
               ]),
-              //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: () => flushData(),
+              onPressed: flushData,
               icon: const Icon(Icons.delete_sweep),
               iconSize: 60,
             ),
           ]),
       body: CustomPaint(
         painter: CurvePainter(gr: data),
-        child: const Center(),
+        child: Align(
+          alignment: Alignment.topRight,
+          child: ButtonBar(
+            mainAxisSize: MainAxisSize.min,
+            children: <Widget>[
+              createButton("Hello", () {}),
+              createButton("Hi", () {}),
+            ],
+          ),
+        ),
       ),
     ));
   }
@@ -97,9 +97,6 @@ class _DrawingPageState extends State<DrawingPage> {
   // 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(
@@ -156,12 +153,17 @@ class _DrawingPageState extends State<DrawingPage> {
   }
 
   void delDotPushed() {
-    if (_textNameController.text == "") {
-      showPopUp("Error", "No name in \"Dot name\" box");
+    if (_textNumbController.text == "") {
+      showPopUp("Error", "No number in \"Dot number\" box");
     } else {
-      String? res = data.addIsolated(_textNameController.text);
-      if (res != null) {
-        showPopUp("Error", res);
+      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();
@@ -170,7 +172,7 @@ class _DrawingPageState extends State<DrawingPage> {
   void addLenPushed() {
     //data.delDot()
     print(
-        "${_textInptController.text} -> ${_textDistController.text} = ${_textLnthController.text}");
+        "${_textNumbController.text} -> ${_textDistController.text} = ${_textLnthController.text}");
     clearTextControllers();
   }
 

flutter/lib/src/graph.dart

@@ -157,7 +157,10 @@ class Graphs {
     return true;
   }
 
-  bool delDot(int inn) {
+  String? delDot(int inn) {
+    if (inn > _amount || inn < 1) {
+      return "Index out of range. Allowed 1..$_amount";
+    }
     List<int> toDel = <int>[];
     for (int i in _dots[inn - 1].getL().keys) {
       toDel.add(i);
@@ -169,7 +172,7 @@ class Graphs {
     _syncNum();
     _syncNameTable();
     _fixAfterDel(inn);
-    return true;
+    return null;
   }
   //*********Delete*********