make checkbox stateless

lib/src/screens/dashboard/widgets/filter_widget.dart

@@ -103,7 +103,7 @@ class FilterWidget extends StatelessWidget {
                                                 gradientBackground: true,
                                                 borderColor: Theme.of(context).dividerColor,
                                                 iconColor: Colors.white,
-                                                onChanged: (bool val){},
+                                                onChanged: (value) => item.onChanged(),
                                               ))
                                           : GestureDetector(
                                         onTap: () async {

lib/src/screens/exchange/exchange_page.dart

@@ -40,7 +40,6 @@ class ExchangePage extends BasePage {
   final ExchangeViewModel exchangeViewModel;
   final depositKey = GlobalKey<ExchangeCardState>();
   final receiveKey = GlobalKey<ExchangeCardState>();
-  final checkBoxKey = GlobalKey<StandardCheckboxState>();
   final _formKey = GlobalKey<FormState>();
   final _depositAmountFocus = FocusNode();
   final _depositAddressFocus = FocusNode();
@@ -339,7 +338,6 @@ class ExchangePage extends BasePage {
                         mainAxisAlignment: MainAxisAlignment.start,
                         children: [
                           StandardCheckbox(
-                            key: checkBoxKey,
                             value: exchangeViewModel.isFixedRateMode,
                             caption: S.of(context).fixed_rate,
                             onChanged: (value) =>
@@ -682,12 +680,6 @@ class ExchangePage extends BasePage {
       }
     });
 
-    reaction((_) => exchangeViewModel.isFixedRateMode, (bool value) {
-      if (checkBoxKey.currentState!.value != exchangeViewModel.isFixedRateMode) {
-        checkBoxKey.currentState!.value = exchangeViewModel.isFixedRateMode;
-      }
-    });
-
     depositAddressController.addListener(
         () => exchangeViewModel.depositAddress = depositAddressController.text);
 

lib/src/widgets/standard_checkbox.dart

@@ -2,16 +2,14 @@ import 'dart:ui';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 
-class StandardCheckbox extends StatefulWidget {
+class StandardCheckbox extends StatelessWidget {
   StandardCheckbox({
-    Key? key,
     required this.value,
     this.caption = '',
     this.gradientBackground = false,
     this.borderColor,
     this.iconColor,
-    required this.onChanged})
-    : super(key: key);
+    required this.onChanged});
 
   final bool value;
   final String caption;
@@ -20,21 +18,7 @@ class StandardCheckbox extends StatefulWidget {
   final Color? iconColor;
   final Function(bool) onChanged;
 
-  @override
-  StandardCheckboxState createState() =>
-      StandardCheckboxState(value, caption, onChanged);
-}
 
-class StandardCheckboxState extends State<StandardCheckbox> {
-  StandardCheckboxState(this.value, this.caption, this.onChanged);
-
-  bool value;
-  String caption;
-  Function(bool) onChanged;
-
-  void changeValue(bool newValue) {
-    setState(() => value = newValue);
-  }
 
   @override
   Widget build(BuildContext context) {
@@ -45,7 +29,7 @@ class StandardCheckboxState extends State<StandardCheckbox> {
     ], begin: Alignment.centerLeft, end: Alignment.centerRight);
 
     final boxBorder = Border.all(
-        color: widget.borderColor ?? Theme.of(context)
+        color: borderColor ?? Theme.of(context)
             .primaryTextTheme
             .caption!
             .color!,
@@ -53,8 +37,8 @@ class StandardCheckboxState extends State<StandardCheckbox> {
 
 
     final checkedBoxDecoration = BoxDecoration(
-        gradient: widget.gradientBackground ? baseGradient : null,
-        border: widget.gradientBackground ? null : boxBorder,
+        gradient: gradientBackground ? baseGradient : null,
+        border: gradientBackground ? null : boxBorder,
         borderRadius: BorderRadius.all(
             Radius.circular(8.0)));
 
@@ -64,11 +48,7 @@ class StandardCheckboxState extends State<StandardCheckbox> {
             Radius.circular(8.0)));
 
     return GestureDetector(
-      onTap: () {
-        value = !value;
-        onChanged(value);
-        setState(() {});
-      },
+      onTap: () => onChanged(!value),
       child: Row(
         mainAxisSize: MainAxisSize.min,
         mainAxisAlignment: MainAxisAlignment.start,
@@ -80,7 +60,7 @@ class StandardCheckboxState extends State<StandardCheckbox> {
             child: value
               ? Icon(
                 Icons.check,
-                color: widget.iconColor ?? Colors.blue,
+                color: iconColor ?? Colors.blue,
                 size: 20.0,
               )
               : Offstage(),

lib/view_model/dashboard/dashboard_view_model.dart

@@ -61,15 +61,15 @@ abstract class DashboardViewModelBase with Store {
         FilterItem(
             value: transactionFilterStore.displayAll,
             caption: S.current.all_transactions,
-            onChanged: () => transactionFilterStore.toggleIAll()),
+            onChanged:  transactionFilterStore.toggleIAll),
         FilterItem(
             value: transactionFilterStore.displayIncoming,
             caption: S.current.incoming,
-            onChanged: () => transactionFilterStore.toggleIncoming()),
+            onChanged:transactionFilterStore.toggleIncoming),
         FilterItem(
             value: transactionFilterStore.displayOutgoing,
             caption: S.current.outgoing,
-            onChanged: () => transactionFilterStore.toggleOutgoing()),
+            onChanged: transactionFilterStore.toggleOutgoing),
         // FilterItem(
         //     value: () => false,
         //     caption: S.current.transactions_by_date,