Pay Anything RC Fixes (#2511)

* feat: Swap flow for Pay Anything. [WIP]

* feat: Pay Anything Swap Flow [WIP]

* feat: Pay anything swap flow [WIP]
- Add fiat values for send and receive amounts to swap details confirmation bottomsheet

* feat: Pay anything swap flow [WIP]
- Switch exchangeviewmodel back to factory
- Expand address box to fill width

* Handle second swipe to swap cta

* Add fiat for receive amount

* Scope Observers for bottomsheets and add validator

* fix: Repeated instances issue for exchangeVM

* fix: Estimated fee and balance not correctly updating after wallet switching occurs

* fix: Available balance not updating properly after wallet switching

* fix: Available balance and fee rate not displaying after wallet is switched in pay anything flow

* fixes: Pay anything related RC fixes
- Recieve fiat amount showing as 0.0
- ID overlapping when there's enough space
- receive amount changing even in fixed rate mode
- Invalid double error for setReceiveFiatAmount

lib/src/widgets/bottom_sheet/swap_confirmation_bottom_sheet.dart

@@ -180,6 +180,7 @@ class SwapConfirmationContentState extends State<SwapConfirmationContent> {
               hintText: 'Amount (${detectedCurrencyName})',
               focusNode: _amountFocus,
               controller: _amountController,
+              keyboardType: TextInputType.numberWithOptions(decimal: true),
               validator: (value) {
                 return AmountValidator(
                   isAutovalidate: true,
@@ -252,6 +253,7 @@ class SwapConfirmationContentState extends State<SwapConfirmationContent> {
               hintText: 'Amount (${widget.exchangeViewModel.fiat.title})',
               focusNode: _amountFiatFocus,
               controller: _amountFiatController,
+              keyboardType: TextInputType.numberWithOptions(decimal: true),
             ),
             const SizedBox(height: 8),
             SwapConfirmationTextfield(
@@ -418,6 +420,7 @@ class SwapConfirmationTextfield extends StatelessWidget {
     this.isAddress = false,
     this.maxLines = 1,
     this.validator,
+    this.keyboardType,
   });
 
   final FocusNode focusNode;
@@ -427,6 +430,8 @@ class SwapConfirmationTextfield extends StatelessWidget {
   final bool isAddress;
   final int maxLines;
   final String? Function(String?)? validator;
+  final TextInputType? keyboardType;
+
   @override
   Widget build(BuildContext context) {
     return Container(
@@ -470,6 +475,7 @@ class SwapConfirmationTextfield extends StatelessWidget {
                   controller: controller,
                   maxLines: maxLines,
                   validator: validator,
+                  keyboardType: keyboardType,
                 ),
         ],
       ),

lib/src/widgets/bottom_sheet/swap_details_bottom_sheet.dart

@@ -10,7 +10,6 @@ import 'package:cake_wallet/src/widgets/standard_slide_button_widget.dart';
 import 'package:cake_wallet/themes/core/material_base_theme.dart';
 import 'package:cake_wallet/core/execution_state.dart';
 import 'package:cake_wallet/view_model/send/send_view_model_state.dart';
-import 'package:cake_wallet/src/widgets/bottom_sheet/confirm_sending_bottom_sheet_widget.dart';
 import 'package:cake_wallet/src/widgets/bottom_sheet/info_bottom_sheet_widget.dart';
 import 'package:cake_wallet/src/widgets/alert_with_one_action.dart';
 import 'package:cake_wallet/utils/show_pop_up.dart';
@@ -19,7 +18,6 @@ import 'package:cw_core/utils/print_verbose.dart';
 import 'package:flutter/services.dart';
 import 'package:mobx/mobx.dart';
 import 'package:flutter_mobx/flutter_mobx.dart';
-import 'package:cake_wallet/reactions/wallet_connect.dart';
 
 class SwapDetailsBottomSheet extends StatefulWidget {
   SwapDetailsBottomSheet({
@@ -289,7 +287,8 @@ class _SwapDetailsContent extends StatelessWidget {
               _SwapDetailsTile(
                 label: 'You Get',
                 value: '${trade.receiveAmount ?? '0'} ${trade.to?.title ?? ''}',
-                valueFiatFormatted: exchangeTradeViewModel.receiveAmountFiatFormatted,
+                valueFiatFormatted: exchangeTradeViewModel
+                    .getReceiveAmountFiatFormatted(trade.receiveAmount ?? '0.0'),
               ),
               const SizedBox(height: 8),
               Container(
@@ -330,6 +329,7 @@ class _SwapDetailsContent extends StatelessWidget {
                   borderRadius: BorderRadius.circular(12),
                 ),
                 child: Row(
+                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                   children: [
                     Row(
                       children: [
@@ -346,28 +346,27 @@ class _SwapDetailsContent extends StatelessWidget {
                                 fontSize: 16,
                               ),
                         ),
+                        const SizedBox(width: 8),
                       ],
                     ),
-                    Spacer(),
                     Expanded(
-                      // flex: 4,
                       child: GestureDetector(
                         onTap: () {
                           Clipboard.setData(ClipboardData(text: trade.id));
                           showBar<void>(context, S.of(context).copied_to_clipboard);
                         },
                         child: Row(
+                          mainAxisAlignment: MainAxisAlignment.end,
                           children: [
                             Text(
                               'ID: ',
                               style: Theme.of(context).textTheme.bodyMedium!.copyWith(fontSize: 18),
                             ),
-                            Expanded(
+                            Flexible(
                               child: Text(
                                 trade.id,
                                 style:
                                     Theme.of(context).textTheme.bodyMedium!.copyWith(fontSize: 18),
-                                    softWrap: true,
                               ),
                             ),
                           ],

lib/view_model/exchange/exchange_trade_view_model.dart

@@ -127,16 +127,16 @@ abstract class ExchangeTradeViewModelBase with Store {
   @computed
   bool get isFiatDisabled => feesViewModel.isFiatDisabled;
 
-  @computed
-  String get receiveAmountFiatFormatted {
+  @action
+  String getReceiveAmountFiatFormatted(String receiveAmount) {
     var amount = '0.00';
     try {
-      if (trade.receiveAmount?.isNotEmpty ?? false) {
+      if (receiveAmount.isNotEmpty) {
         if (fiatConversionStore.prices[trade.to] == null) return '';
 
         amount = calculateFiatAmount(
           price: fiatConversionStore.prices[trade.to]!,
-          cryptoAmount: trade.receiveAmount,
+          cryptoAmount: receiveAmount,
         );
       }
     } catch (_) {

lib/view_model/exchange/exchange_view_model.dart

@@ -24,7 +24,6 @@ import 'package:cake_wallet/exchange/provider/chainflip_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/changenow_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/exolix_exchange_provider.dart';
-import 'package:cake_wallet/exchange/provider/letsexchange_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/sideshift_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/stealth_ex_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/swaptrade_exchange_provider.dart';
@@ -449,8 +448,8 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
 
   @action
   void setReceiveAmountFromFiat({required String fiatAmount}) {
-    final crypto = double.parse(fiatAmount.replaceAll(',', '.')) /
-        fiatConversionStore.prices[receiveCurrency]!;
+    final _enteredAmount = double.tryParse(fiatAmount.replaceAll(',', '.')) ?? 0.0;
+    final crypto = _enteredAmount / fiatConversionStore.prices[receiveCurrency]!;
     final receiveAmountTmp = _cryptoNumberFormat.format(crypto);
     if (receiveAmount != receiveAmountTmp) {
       changeReceiveAmount(amount: receiveAmountTmp);
@@ -467,6 +466,10 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
       return;
     }
 
+    /// For fixed-rate transactions, we don't want to recalculate receive amount
+    /// as it should remain exactly what the user set
+    if (isFixedRateMode) return;
+
     final _enteredAmount = double.tryParse(amount.replaceAll(',', '.')) ?? 0;
 
     /// in case the best rate was not calculated yet
@@ -475,6 +478,7 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
 
       await calculateBestRate();
     }
+
     _cryptoNumberFormat.maximumFractionDigits = receiveMaxDigits;
 
     receiveAmount = _cryptoNumberFormat