Text changed on listeners (#4)

lib/Home.dart

@@ -1,4 +1,5 @@
 import 'package:easy_cc_flutter/MainViewModel.dart';
+import 'package:easy_cc_flutter/Utils/SelectionType.dart';
 import 'package:easy_cc_flutter/views/DropDownBox.dart';
 import 'package:easy_cc_flutter/views/EditText.dart';
 import 'package:flutter/cupertino.dart';
@@ -16,6 +17,9 @@ class HomePage extends BaseStatelessWidget<MainViewModel> {
   @override
   Widget displayWidget(
       BuildContext context, MainViewModel model, Widget? child) {
+    TextEditingController controller1 = TextEditingController();
+    TextEditingController controller2 = TextEditingController();
+
     return Column(
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
@@ -24,7 +28,9 @@ class HomePage extends BaseStatelessWidget<MainViewModel> {
           child: Column(
             children: [
               DropDownBox(model.data, (selected) {}),
-              EditText("Enter conversion from", model.top, (selection) => {})
+              ConverterEditText("Enter conversion from", controller1, (input) => {
+                controller2.text = model.convertInput(input, SelectionType.conversionFrom)
+              })
             ],
           ),
         ),
@@ -33,7 +39,9 @@ class HomePage extends BaseStatelessWidget<MainViewModel> {
           child: Column(
             children: [
               DropDownBox(model.data, (selected) {}),
-              EditText("Enter conversion from", model.bottom, (selection) => {})
+              ConverterEditText("Enter conversion from", controller2, (input) => {
+                controller1.text = model.convertInput(input, SelectionType.conversionTo)
+              })
             ],
           ),
         ),

lib/MainViewModel.dart

@@ -1,9 +1,9 @@
 import 'package:easy_cc_flutter/BaseViewModel.dart';
+import 'package:easy_cc_flutter/Utils/SelectionType.dart';
 
 class MainViewModel extends BaseViewmodel {
 
-  String? top;
-  String? bottom;
+  double conversionRate = 1.4;
 
   final List<String> data = <String>['ALL - Albanian Lek',
     'AFN - Afghan Afghani',
@@ -160,4 +160,18 @@ class MainViewModel extends BaseViewmodel {
     'XOF - West African CFA Franc',
     'YER - Yemeni Rial',
     'ZMW - Zambian Kwacha'];
+
+  String convertInput(String? input, SelectionType type) {
+    if (input == null || input.isEmpty) {
+      return "";
+    }
+    double convertedInput = double.parse(input);
+
+    switch (type) {
+      case SelectionType.conversionFrom:
+        return (convertedInput * conversionRate).toStringAsFixed(2);
+      case SelectionType.conversionTo:
+        return (convertedInput / conversionRate).toStringAsFixed(2);
+    }
+  }
 }

lib/Utils/SelectionType.dart

@@ -0,0 +1,4 @@
+enum SelectionType {
+  conversionFrom,
+  conversionTo
+}

lib/views/EditText.dart

@@ -1,22 +1,21 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 
 import '../Utils/Constants.dart';
 
-class EditText extends StatelessWidget {
+class ConverterEditText extends StatelessWidget {
   final String _hintText;
-  final String? _input;
   final Function(String?) _onChanged;
+  final TextEditingController _controller;
 
-  const EditText(this._hintText, this._input, this._onChanged, {super.key});
+  const ConverterEditText(this._hintText, this._controller, this._onChanged, {super.key});
 
   @override
   Widget build(BuildContext context) {
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 2, horizontal: 4),
       child: TextField(
-        controller: TextEditingController(
-          text: _input
-        ),
+        controller: _controller,
         decoration: InputDecoration(
           contentPadding: const EdgeInsets.all(14),
           border: const OutlineInputBorder(
@@ -28,7 +27,10 @@ class EditText extends StatelessWidget {
           hintText: _hintText,
         ),
         onChanged: _onChanged,
-
+        keyboardType: const TextInputType.numberWithOptions(decimal: true),
+        inputFormatters: <TextInputFormatter>[
+          FilteringTextInputFormatter.allow(RegExp("[0-9]")),
+        ],
       ),
     );
   }