CAKE-20 | updated send and send template pages; added send_template_store and exchange_template_store; created base_send_widget; applied send_template_store to send_view_model; applied base_send_widget to send and send template pages; added properties to address_text_field, base_text_field and template_tile

lib/core/amount_validator.dart

@@ -13,10 +13,10 @@ class AmountValidator extends TextValidator {
   static String _pattern(WalletType type) {
     switch (type) {
       case WalletType.monero:
-        return '^([0-9]+([.][0-9]{0,12})?|[.][0-9]{1,12})\$';
+        return '^([0-9]+([.][0-9]{0,12})?|[.][0-9]{1,12}|ALL)\$';
       case WalletType.bitcoin:
         // FIXME: Incorrect pattern for bitcoin
-        return '^([0-9]+([.][0-9]{0,12})?|[.][0-9]{1,12})\$';
+        return '^([0-9]+([.][0-9]{0,12})?|[.][0-9]{1,12}|ALL)\$';
       default:
         return '';
     }

lib/core/template_validator.dart

@@ -0,0 +1,12 @@
+import 'package:cake_wallet/core/validator.dart';
+import 'package:cake_wallet/generated/i18n.dart';
+
+class TemplateValidator extends TextValidator {
+  TemplateValidator()
+      : super(
+          minLength: 0,
+          maxLength: 0,
+          pattern: '''^[^`,'"]{1,20}\$''',
+          errorMessage: S.current.error_text_template
+        );
+}

lib/core/validator.dart

@@ -27,7 +27,7 @@ class TextValidator extends Validator<String> {
   @override
   bool isValid(String value) {
     if (value == null || value.isEmpty) {
-      return true;
+      return false;
     }
 
     return value.length > (minLength ?? 0) &&
@@ -42,4 +42,4 @@ class TextValidator extends Validator<String> {
 class WalletNameValidator extends TextValidator {
   WalletNameValidator()
       : super(minLength: 1, maxLength: 15, pattern: '^[a-zA-Z0-9_]\$');
-}
+}