dart formatting

CHANGELOG.md

@@ -1,3 +1,18 @@
+## 0.0.9
+
+- Drastically improved usability and performance with flutter web and canvaskit renderer, especially on mobile
+- Using streams to more accurately call `widget.onValidCardDetails` when the card details are valid and completed
+- Added `cursorColor` customization
+- Reworked widget life cycle so that hot reloads work as expected (resizing, focus, etc.).
+
+## 0.0.8
+
+- Updated dart sdk constraints again... oops (>=3.0.0)
+
+## 0.0.7
+
+- Changed pubspec versioning to allow lower SDK constraints (>=2.12.0)
+
 ## 0.0.6
 
 - Improved assertion and error messaging when missing stripe implements

example/pubspec.lock

@@ -45,10 +45,10 @@ packages:
     dependency: transitive
     description:
       name: collection
-      sha256: f092b211a4319e98e5ff58223576de6c2803db36221657b46c82574721240687
+      sha256: ee67cb0715911d28db6bf4af1026078bd6f0128b07a5f66fb2ed94ec6783c09a
       url: "https://pub.dev"
     source: hosted
-    version: "1.17.2"
+    version: "1.18.0"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -135,10 +135,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: "3c74dbf8763d36539f114c799d8a2d87343b5067e9d796ca22b5eb8437090ee3"
+      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
       url: "https://pub.dev"
     source: hosted
-    version: "1.9.1"
+    version: "1.10.0"
   path:
     dependency: transitive
     description:
@@ -180,18 +180,18 @@ packages:
     dependency: transitive
     description:
       name: stack_trace
-      sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5
+      sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
       url: "https://pub.dev"
     source: hosted
-    version: "1.11.0"
+    version: "1.11.1"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8"
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.2"
   string_scanner:
     dependency: transitive
     description:
@@ -206,7 +206,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.0.5"
+    version: "0.0.9"
   term_glyph:
     dependency: transitive
     description:
@@ -219,10 +219,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "75760ffd7786fffdfb9597c35c5b27eaeec82be8edfb6d71d32651128ed7aab8"
+      sha256: "5c2f730018264d276c20e4f1503fd1308dfbbae39ec8ee63c5236311ac06954b"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.0"
+    version: "0.6.1"
   typed_data:
     dependency: transitive
     description:
@@ -267,10 +267,10 @@ packages:
     dependency: transitive
     description:
       name: web
-      sha256: dc8ccd225a2005c1be616fe02951e2e342092edf968cf0844220383757ef8f10
+      sha256: afe077240a270dcfd2aafe77602b4113645af95d0ad31128cc02bce5ac5d5152
       url: "https://pub.dev"
     source: hosted
-    version: "0.1.4-beta"
+    version: "0.3.0"
   xml:
     dependency: transitive
     description:
@@ -280,5 +280,5 @@ packages:
     source: hosted
     version: "6.3.0"
 sdks:
-  dart: ">=3.1.3 <4.0.0"
+  dart: ">=3.2.0-194.0.dev <4.0.0"
   flutter: ">=3.7.0-0"

example/pubspec.yaml

@@ -4,7 +4,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: '>=3.1.3 <4.0.0'
+  sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
   flutter:

lib/card_details.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/foundation.dart';
 
 /// Class encapsulating the card's data
@@ -39,6 +41,7 @@ class CardDetails {
   CardDetailsValidState _validState = CardDetailsValidState.blank;
   int _lastCheckHash = 0;
   CardProvider? provider;
+  StreamController<CardDetails> onCompleteController = StreamController();
 
   set overrideValidState(CardDetailsValidState state) => _validState = state;
 
@@ -51,7 +54,6 @@ class CardDetails {
   String get expMonth => isComplete ? expirationString!.split('/').first : '';
   String get expYear => isComplete ? expirationString!.split('/').last : '';
 
-  // TODO rename to be more clear
   /// Returns true if `_cardNumber` is null, or
   /// if the _cardNumber matches the detected `provider`'s
   /// card lenght, defaulting to 16.
@@ -66,6 +68,14 @@ class CardDetails {
     return _complete;
   }
 
+  /// Detects if the card is complete, then broadcasts
+  /// card details to `onCompleteController`
+  void broadcastStatus() {
+    if (isComplete) {
+      onCompleteController.add(this);
+    }
+  }
+
   /// The maximum length of the INN (identifier)
   /// of a card provider.
   int get maxINNLength => 4;
@@ -82,12 +92,12 @@ class CardDetails {
         return;
       }
 
+      _complete = false;
       _lastCheckHash = currentHash;
       if (_cardNumber == null &&
           expirationString == null &&
           securityCode == null &&
           postalCode == null) {
-        _complete = false;
         _validState = CardDetailsValidState.blank;
         return;
       }
@@ -99,63 +109,52 @@ class CardDetails {
           )
           .toList();
       if (!_luhnAlgorithmCheck(nums)) {
-        _complete = false;
         _validState = CardDetailsValidState.invalidCard;
         return;
       }
       if (_cardNumber == null || !cardNumberFilled) {
-        _complete = false;
         _validState = CardDetailsValidState.missingCard;
         return;
       }
       if (expirationString == null) {
-        _complete = false;
         _validState = CardDetailsValidState.missingDate;
         return;
       }
       final expSplits = expirationString!.split('/');
       if (expSplits.length != 2 || expSplits.last == '') {
-        _complete = false;
         _validState = CardDetailsValidState.missingDate;
         return;
       }
       final month = int.parse(
           expSplits.first[0] == '0' ? expSplits.first[1] : expSplits.first);
       if (month < 1 || month > 12) {
-        _complete = false;
         _validState = CardDetailsValidState.invalidMonth;
         return;
       }
       final year = 2000 + int.parse(expSplits.last);
       final date = DateTime(year, month);
       if (date.isBefore(DateTime.now())) {
-        _complete = false;
         _validState = CardDetailsValidState.dateTooEarly;
         return;
       } else if (date
           .isAfter(DateTime.now().add(const Duration(days: 365 * 50)))) {
-        _complete = false;
         _validState = CardDetailsValidState.dateTooLate;
         return;
       }
       expirationDate = date;
       if (securityCode == null) {
-        _complete = false;
         _validState = CardDetailsValidState.missingCVC;
         return;
       }
       if (provider != null && securityCode!.length != provider!.cvcLength) {
-        _complete = false;
         _validState = CardDetailsValidState.invalidCVC;
         return;
       }
       if (postalCode == null) {
-        _complete = false;
         _validState = CardDetailsValidState.missingZip;
         return;
       }
       if (!RegExp(r'^\d{5}(-\d{4})?$').hasMatch(postalCode!)) {
-        _complete = false;
         _validState = CardDetailsValidState.invalidZip;
         return;
       }

lib/stripe_native_card_field.dart

@@ -42,19 +42,22 @@ class CardTextField extends StatefulWidget {
     Key? key,
     required this.width,
     this.onStripeResponse,
+    this.onCallToStripe,
     this.onValidCardDetails,
+    this.onSubmitted,
     this.stripePublishableKey,
     this.height,
     this.textStyle,
     this.hintTextStyle,
     this.errorTextStyle,
+    this.cursorColor,
     this.boxDecoration,
     this.errorBoxDecoration,
     this.loadingWidget,
     this.loadingWidgetLocation = LoadingLocation.below,
+    this.autoFetchStripektoken = true,
     this.showInternalLoadingWidget = true,
     this.delayToShowLoading = const Duration(milliseconds: 0),
-    this.onCallToStripe,
     this.overrideValidState,
     this.errorText,
     this.cardFieldWidth,
@@ -130,12 +133,18 @@ class CardTextField extends StatefulWidget {
   /// If null, inherits from the `textStyle`.
   final TextStyle? errorTextStyle;
 
+  /// Color used for the cursor, if null, inherits the primary color of the Theme
+  final Color? cursorColor;
+
   /// Time to wait until showing the loading indicator when retrieving Stripe token, defaults to 0 milliseconds.
   final Duration delayToShowLoading;
 
   /// Whether to show the internal loading widget on calls to Stripe
   final bool showInternalLoadingWidget;
 
+  /// Whether to automatically call `getStripeResponse` when the `_cardDetails` are valid.
+  final bool autoFetchStripektoken;
+
   /// Stripe publishable key, starts with 'pk_'
   final String? stripePublishableKey;
 
@@ -143,11 +152,15 @@ class CardTextField extends StatefulWidget {
   final void Function()? onCallToStripe;
 
   /// Callback that returns the stripe token for the card
-  final void Function(Map<String, dynamic>)? onStripeResponse;
+  final void Function(Map<String, dynamic>?)? onStripeResponse;
 
   /// Callback that returns the completed CardDetails object
   final void Function(CardDetails)? onValidCardDetails;
 
+  /// Callback when the user hits enter or done in the postal code field
+  /// Optionally returns the `CardDetails` object if it is valid
+  final void Function(CardDetails?)? onSubmitted;
+
   /// Can manually override the ValidState to surface errors returned from Stripe
   final CardDetailsValidState? overrideValidState;
 
@@ -159,20 +172,8 @@ class CardTextField extends StatefulWidget {
 
   // CardTextFieldState? get state => _key.currentState;
 
-  /// Validates the current fields and makes an http request to get the stripe
-  /// token for the `CardDetails` provided. Will return null if the data is not
-  /// complete or does not validate properly.
-  // Future<Map<String, dynamic>?> fetchStripeResponse() async {
-  //   if (kDebugMode && _key.currentState == null) print('Could not fetch Stripe Response, currentState == null');
-  //   return _key.currentState?.getStripeResponse();
-  // }
-
   @override
   State<CardTextField> createState() => CardTextFieldState();
-  // {
-  //   _state = CardTextFieldState();
-  //   return _state;
-  // }
 }
 
 /// State Widget for CardTextField
@@ -180,51 +181,53 @@ class CardTextField extends StatefulWidget {
 /// create a GlobalKey for directly accessing
 /// the `getStripeResponse` function
 class CardTextFieldState extends State<CardTextField> {
-  late TextEditingController _cardNumberController;
-  late TextEditingController _expirationController;
-  late TextEditingController _securityCodeController;
-  late TextEditingController _postalCodeController;
+  late final TextEditingController _cardNumberController;
+  late final TextEditingController _expirationController;
+  late final TextEditingController _securityCodeController;
+  late final TextEditingController _postalCodeController;
+  final List<TextEditingController> _controllers = [];
 
   // Not made private for access in widget tests
-  late FocusNode cardNumberFocusNode;
-  late FocusNode expirationFocusNode;
-  late FocusNode securityCodeFocusNode;
-  late FocusNode postalCodeFocusNode;
+  late final FocusNode cardNumberFocusNode;
+  late final FocusNode expirationFocusNode;
+  late final FocusNode securityCodeFocusNode;
+  late final FocusNode postalCodeFocusNode;
 
   // Not made private for access in widget tests
-  late final bool isWideFormat;
+  late bool isWideFormat;
 
   // Widget configurable styles
-  late final BoxDecoration _normalBoxDecoration;
-  late final BoxDecoration _errorBoxDecoration;
-  late final TextStyle _errorTextStyle;
-  late final TextStyle _normalTextStyle;
-  late final TextStyle _hintTextSyle;
+  late BoxDecoration _normalBoxDecoration;
+  late BoxDecoration _errorBoxDecoration;
+  late TextStyle _errorTextStyle;
+  late TextStyle _normalTextStyle;
+  late TextStyle _hintTextSyle;
+  late Color _cursorColor;
 
   /// Width of the card number text field
-  late final double _cardFieldWidth;
+  late double _cardFieldWidth;
 
   /// Width of the expiration text field
-  late final double _expirationFieldWidth;
+  late double _expirationFieldWidth;
 
   /// Width of the security code text field
-  late final double _securityFieldWidth;
+  late double _securityFieldWidth;
 
   /// Width of the postal code text field
-  late final double _postalFieldWidth;
+  late double _postalFieldWidth;
 
   /// Width of the internal scrollable field, is potentially larger than the provided `widget.width`
-  late final double _internalFieldWidth;
+  late double _internalFieldWidth;
 
   /// Width of the gap between card number and expiration text fields when expanded
-  late final double _expanderWidthExpanded;
+  late double _expanderWidthExpanded;
 
   /// Width of the gap between card number and expiration text fields when collapsed
-  late final double _expanderWidthCollapsed;
+  late double _expanderWidthCollapsed;
 
   String? _validationErrorText;
   bool _showBorderError = false;
-  final _isMobile = kIsWeb ? false : Platform.isAndroid || Platform.isIOS;
+  late bool _isMobile;
 
   /// If a request to Stripe is being made
   bool _loading = false;
@@ -239,10 +242,7 @@ class CardTextFieldState extends State<CardTextField> {
 
   @override
   void initState() {
-    _cardFieldWidth = widget.cardFieldWidth ?? 180.0;
-    _expirationFieldWidth = widget.expFieldWidth ?? 70.0;
-    _securityFieldWidth = widget.securityFieldWidth ?? 40.0;
-    _postalFieldWidth = widget.postalFieldWidth ?? 95.0;
+    _calculateProperties();
 
     // No way to get backspace events on soft keyboards, so add invisible character to detect delete
     _cardNumberController = TextEditingController();
@@ -253,92 +253,38 @@ class CardTextFieldState extends State<CardTextField> {
     _postalCodeController =
         TextEditingController(text: _isMobile ? '\u200b' : '');
 
-    // Otherwise, use `RawKeyboard` listener
-    if (!_isMobile) {
-      RawKeyboard.instance.addListener(_backspaceTransitionListener);
-    }
+    _controllers.addAll([
+      _cardNumberController,
+      _expirationController,
+      _securityCodeController,
+      _postalCodeController,
+    ]);
 
     cardNumberFocusNode = FocusNode();
     expirationFocusNode = FocusNode();
     securityCodeFocusNode = FocusNode();
     postalCodeFocusNode = FocusNode();
 
-    _errorTextStyle =
-        const TextStyle(color: Colors.red, fontSize: 14, inherit: true)
-            .merge(widget.errorTextStyle ?? widget.textStyle);
-    _normalTextStyle =
-        const TextStyle(color: Colors.black87, fontSize: 14, inherit: true)
-            .merge(widget.textStyle);
-    _hintTextSyle =
-        const TextStyle(color: Colors.black54, fontSize: 14, inherit: true)
-            .merge(widget.hintTextStyle ?? widget.textStyle);
-
-    _normalBoxDecoration = BoxDecoration(
-      color: const Color(0xfff6f9fc),
-      border: Border.all(
-        color: const Color(0xffdde0e3),
-        width: 2.0,
-      ),
-      borderRadius: BorderRadius.circular(8.0),
-    ).copyWith(
-      backgroundBlendMode: widget.boxDecoration?.backgroundBlendMode,
-      border: widget.boxDecoration?.border,
-      borderRadius: widget.boxDecoration?.borderRadius,
-      boxShadow: widget.boxDecoration?.boxShadow,
-      color: widget.boxDecoration?.color,
-      gradient: widget.boxDecoration?.gradient,
-      image: widget.boxDecoration?.image,
-      shape: widget.boxDecoration?.shape,
-    );
-
-    _errorBoxDecoration = BoxDecoration(
-      color: const Color(0xfff6f9fc),
-      border: Border.all(
-        color: Colors.red,
-        width: 2.0,
-      ),
-      borderRadius: BorderRadius.circular(8.0),
-    ).copyWith(
-      backgroundBlendMode: widget.errorBoxDecoration?.backgroundBlendMode,
-      border: widget.errorBoxDecoration?.border,
-      borderRadius: widget.errorBoxDecoration?.borderRadius,
-      boxShadow: widget.errorBoxDecoration?.boxShadow,
-      color: widget.errorBoxDecoration?.color,
-      gradient: widget.errorBoxDecoration?.gradient,
-      image: widget.errorBoxDecoration?.image,
-      shape: widget.errorBoxDecoration?.shape,
-    );
+    // Add backspace transition listener for non mobile clients
+    if (!_isMobile) {
+      RawKeyboard.instance.addListener(_backspaceTransitionListener);
+    }
 
+    // Add listener to change focus and whatnot between fields
     _currentCardEntryStepController.stream.listen(
       _onStepChange,
     );
 
-    isWideFormat = widget.width >=
-        _cardFieldWidth +
-            _expirationFieldWidth +
-            _securityFieldWidth +
-            _postalFieldWidth +
-            60.0;
-    if (isWideFormat) {
-      _internalFieldWidth = widget.width + _postalFieldWidth + 35;
-      _expanderWidthExpanded = widget.width -
-          _cardFieldWidth -
-          _expirationFieldWidth -
-          _securityFieldWidth -
-          35;
-      _expanderWidthCollapsed = widget.width -
-          _cardFieldWidth -
-          _expirationFieldWidth -
-          _securityFieldWidth -
-          _postalFieldWidth -
-          70;
-    } else {
-      _internalFieldWidth = _cardFieldWidth +
-          _expirationFieldWidth +
-          _securityFieldWidth +
-          _postalFieldWidth +
-          80;
+    // Add listeners to know when card details are completed
+    _cardDetails.onCompleteController.stream.listen((card) async {
+      if (widget.stripePublishableKey != null &&
+          widget.onStripeResponse != null &&
+          widget.autoFetchStripektoken) {
+        final res = await getStripeResponse();
+        widget.onStripeResponse!(res);
       }
+      if (widget.onValidCardDetails != null) widget.onValidCardDetails!(card);
+    });
 
     super.initState();
   }
@@ -348,10 +294,12 @@ class CardTextFieldState extends State<CardTextField> {
     _cardNumberController.dispose();
     _expirationController.dispose();
     _securityCodeController.dispose();
+    _postalCodeController.dispose();
 
     cardNumberFocusNode.dispose();
     expirationFocusNode.dispose();
     securityCodeFocusNode.dispose();
+    postalCodeFocusNode.dispose();
 
     if (!_isMobile) {
       RawKeyboard.instance.removeListener(_backspaceTransitionListener);
@@ -362,13 +310,10 @@ class CardTextFieldState extends State<CardTextField> {
 
   @override
   Widget build(BuildContext context) {
-    if ((widget.errorText != null || widget.overrideValidState != null) &&
-        Object.hashAll([widget.errorText, widget.overrideValidState]) !=
-            _prevErrorOverrideHash) {
-      _prevErrorOverrideHash =
-          Object.hashAll([widget.errorText, widget.overrideValidState]);
-      _validateFields();
-    }
+    _calculateProperties();
+    _initStyles();
+    _checkErrorOverride();
+
     return Column(
       mainAxisAlignment: MainAxisAlignment.center,
       crossAxisAlignment: CrossAxisAlignment.start,
@@ -478,7 +423,8 @@ class CardTextFieldState extends State<CardTextField> {
                                       if (content == null || content.isEmpty) {
                                         return null;
                                       }
-                                      _cardDetails.cardNumber = content;
+                                      // setState(() => _cardDetails.cardNumber = content);
+
                                       if (_cardDetails.validState ==
                                           CardDetailsValidState.invalidCard) {
                                         _setValidationState(
@@ -491,9 +437,9 @@ class CardTextFieldState extends State<CardTextField> {
                                       return null;
                                     },
                                     onChanged: (str) {
+                                      _onTextFieldChanged(
+                                          str, CardEntryStep.number);
                                       final numbers = str.replaceAll(' ', '');
-                                      setState(() =>
-                                          _cardDetails.cardNumber = numbers);
                                       if (str.length <=
                                           _cardDetails.maxINNLength) {
                                         _cardDetails.detectCardProvider();
@@ -512,6 +458,7 @@ class CardTextFieldState extends State<CardTextField> {
                                           RegExp('[0-9 ]')),
                                       CardNumberInputFormatter(),
                                     ],
+                                    cursorColor: _cursorColor,
                                     decoration: InputDecoration(
                                       hintText: 'Card number',
                                       contentPadding: EdgeInsets.zero,
@@ -551,7 +498,7 @@ class CardTextFieldState extends State<CardTextField> {
                                       if (_isMobile &&
                                           _expirationController.text ==
                                               '\u200b')
-                                        Text('MM/YY', style: _hintTextSyle),
+                                        Text('MM/YYY', style: _hintTextSyle),
                                       TextFormField(
                                         key: const Key('expiration_field'),
                                         focusNode: expirationFocusNode,
@@ -573,15 +520,12 @@ class CardTextFieldState extends State<CardTextField> {
                                             return null;
                                           }
 
-                                          if (_isMobile) {
-                                            setState(() =>
-                                                _cardDetails.expirationString =
-                                                    content.replaceAll(
-                                                        '\u200b', ''));
-                                          } else {
-                                            setState(() => _cardDetails
-                                                .expirationString = content);
-                                          }
+                                          // if (_isMobile) {
+                                          //   setState(
+                                          //       () => _cardDetails.expirationString = content.replaceAll('\u200b', ''));
+                                          // } else {
+                                          //   setState(() => _cardDetails.expirationString = content);
+                                          // }
 
                                           if (_cardDetails.validState ==
                                               CardDetailsValidState
@@ -607,17 +551,8 @@ class CardTextFieldState extends State<CardTextField> {
                                           return null;
                                         },
                                         onChanged: (str) {
-                                          if (_isMobile) {
-                                            if (str.isEmpty) {
-                                              _backspacePressed();
-                                            }
-                                            setState(() => _cardDetails
-                                                    .expirationString =
-                                                str.replaceAll('\u200b', ''));
-                                          } else {
-                                            setState(() => _cardDetails
-                                                .expirationString = str);
-                                          }
+                                          _onTextFieldChanged(
+                                              str, CardEntryStep.exp);
                                           if (str.length == 5) {
                                             _currentCardEntryStepController
                                                 .add(CardEntryStep.cvc);
@@ -632,6 +567,7 @@ class CardTextFieldState extends State<CardTextField> {
                                               RegExp('[0-9/]')),
                                           CardExpirationFormatter(),
                                         ],
+                                        cursorColor: _cursorColor,
                                         decoration: InputDecoration(
                                           contentPadding: EdgeInsets.zero,
                                           hintText: _isMobile ? '' : 'MM/YY',
@@ -674,15 +610,12 @@ class CardTextFieldState extends State<CardTextField> {
                                             return null;
                                           }
 
-                                          if (_isMobile) {
-                                            setState(() =>
-                                                _cardDetails.securityCode =
-                                                    content.replaceAll(
-                                                        '\u200b', ''));
-                                          } else {
-                                            setState(() => _cardDetails
-                                                .securityCode = content);
-                                          }
+                                          // if (_isMobile) {
+                                          //   setState(
+                                          //       () => _cardDetails.securityCode = content.replaceAll('\u200b', ''));
+                                          // } else {
+                                          //   setState(() => _cardDetails.securityCode = content);
+                                          // }
 
                                           if (_cardDetails.validState ==
                                               CardDetailsValidState
@@ -701,17 +634,8 @@ class CardTextFieldState extends State<CardTextField> {
                                             _currentCardEntryStepController
                                                 .add(CardEntryStep.postal),
                                         onChanged: (str) {
-                                          if (_isMobile) {
-                                            if (str.isEmpty) {
-                                              _backspacePressed();
-                                            }
-                                            setState(() => _cardDetails
-                                                    .expirationString =
-                                                str.replaceAll('\u200b', ''));
-                                          } else {
-                                            setState(() => _cardDetails
-                                                .expirationString = str);
-                                          }
+                                          _onTextFieldChanged(
+                                              str, CardEntryStep.cvc);
 
                                           if (str.length ==
                                               _cardDetails
@@ -729,6 +653,7 @@ class CardTextFieldState extends State<CardTextField> {
                                           FilteringTextInputFormatter.allow(
                                               RegExp('[0-9]')),
                                         ],
+                                        cursorColor: _cursorColor,
                                         decoration: InputDecoration(
                                           contentPadding: EdgeInsets.zero,
                                           hintText: _isMobile ? '' : 'CVC',
@@ -771,15 +696,11 @@ class CardTextFieldState extends State<CardTextField> {
                                             return null;
                                           }
 
-                                          if (_isMobile) {
-                                            setState(() =>
-                                                _cardDetails.postalCode =
-                                                    content.replaceAll(
-                                                        '\u200b', ''));
-                                          } else {
-                                            setState(() => _cardDetails
-                                                .postalCode = content);
-                                          }
+                                          // if (_isMobile) {
+                                          //   setState(() => _cardDetails.postalCode = content.replaceAll('\u200b', ''));
+                                          // } else {
+                                          //   setState(() => _cardDetails.postalCode = content);
+                                          // }
 
                                           if (_cardDetails.validState ==
                                               CardDetailsValidState
@@ -795,22 +716,14 @@ class CardTextFieldState extends State<CardTextField> {
                                           return null;
                                         },
                                         onChanged: (str) {
-                                          if (_isMobile) {
-                                            if (str.isEmpty) {
-                                              _backspacePressed();
-                                            }
-                                            setState(() => _cardDetails
-                                                    .postalCode =
-                                                str.replaceAll('\u200b', ''));
-                                          } else {
-                                            setState(() =>
-                                                _cardDetails.postalCode = str);
-                                          }
+                                          _onTextFieldChanged(
+                                              str, CardEntryStep.postal);
                                         },
                                         textInputAction: TextInputAction.done,
                                         onFieldSubmitted: (_) {
                                           _postalFieldSubmitted();
                                         },
+                                        cursorColor: _cursorColor,
                                         decoration: InputDecoration(
                                           contentPadding: EdgeInsets.zero,
                                           hintText:
@@ -862,24 +775,163 @@ class CardTextFieldState extends State<CardTextField> {
     );
   }
 
+  void _onTextFieldChanged(String str, CardEntryStep step) {
+    String cleanedStr;
+    if (_isMobile) {
+      cleanedStr = str.replaceAll('\u200b', '');
+    } else {
+      cleanedStr = str;
+    }
+
+    switch (step) {
+      case CardEntryStep.number:
+        setState(
+            () => _cardDetails.cardNumber = cleanedStr.replaceAll(' ', ''));
+        break;
+      case CardEntryStep.exp:
+        setState(() => _cardDetails.expirationString = cleanedStr);
+        break;
+      case CardEntryStep.cvc:
+        setState(() => _cardDetails.securityCode = cleanedStr);
+        break;
+      case CardEntryStep.postal:
+        setState(() => _cardDetails.postalCode = cleanedStr);
+        break;
+    }
+
+    if (_isMobile && str.isEmpty) {
+      _mobileBackspaceDetected();
+    }
+
+    // Check if card is complete and broadcast
+    _cardDetails.broadcastStatus();
+  }
+
+  /// Called in `initState()` as well as `build()`, determines form factor and target device
+  void _calculateProperties() {
+    // TODO skip if not needing to recalc
+    _cardFieldWidth = widget.cardFieldWidth ?? 180.0;
+    _expirationFieldWidth = widget.expFieldWidth ?? 70.0;
+    _securityFieldWidth = widget.securityFieldWidth ?? 40.0;
+    _postalFieldWidth = widget.postalFieldWidth ?? 95.0;
+    isWideFormat = widget.width >=
+        _cardFieldWidth +
+            _expirationFieldWidth +
+            _securityFieldWidth +
+            _postalFieldWidth +
+            60.0;
+    if (isWideFormat) {
+      _internalFieldWidth = widget.width + _postalFieldWidth + 35;
+      _expanderWidthExpanded = widget.width -
+          _cardFieldWidth -
+          _expirationFieldWidth -
+          _securityFieldWidth -
+          35;
+      _expanderWidthCollapsed = widget.width -
+          _cardFieldWidth -
+          _expirationFieldWidth -
+          _securityFieldWidth -
+          _postalFieldWidth -
+          70;
+    } else {
+      _internalFieldWidth = _cardFieldWidth +
+          _expirationFieldWidth +
+          _securityFieldWidth +
+          _postalFieldWidth +
+          80;
+    }
+
+    _isMobile = kIsWeb ? !isWideFormat : Platform.isAndroid || Platform.isIOS;
+
+    // int index = 0;
+    // for (final controller in _controllers) {
+    //   if (controller.text.isNotEmpty || index == 0) continue;
+    //   controller.text = '\u200b';
+    //   index += 1;
+    // }
+  }
+
+  /// Called every `build()` invocation, combines passed in styles with the defaults
+  void _initStyles() {
+    _errorTextStyle =
+        const TextStyle(color: Colors.red, fontSize: 14, inherit: true)
+            .merge(widget.errorTextStyle ?? widget.textStyle);
+    _normalTextStyle =
+        const TextStyle(color: Colors.black87, fontSize: 14, inherit: true)
+            .merge(widget.textStyle);
+    _hintTextSyle =
+        const TextStyle(color: Colors.black54, fontSize: 14, inherit: true)
+            .merge(widget.hintTextStyle ?? widget.textStyle);
+
+    _normalBoxDecoration = BoxDecoration(
+      color: const Color(0xfff6f9fc),
+      border: Border.all(
+        color: const Color(0xffdde0e3),
+        width: 2.0,
+      ),
+      borderRadius: BorderRadius.circular(8.0),
+    ).copyWith(
+      backgroundBlendMode: widget.boxDecoration?.backgroundBlendMode,
+      border: widget.boxDecoration?.border,
+      borderRadius: widget.boxDecoration?.borderRadius,
+      boxShadow: widget.boxDecoration?.boxShadow,
+      color: widget.boxDecoration?.color,
+      gradient: widget.boxDecoration?.gradient,
+      image: widget.boxDecoration?.image,
+      shape: widget.boxDecoration?.shape,
+    );
+
+    _errorBoxDecoration = BoxDecoration(
+      color: const Color(0xfff6f9fc),
+      border: Border.all(
+        color: Colors.red,
+        width: 2.0,
+      ),
+      borderRadius: BorderRadius.circular(8.0),
+    ).copyWith(
+      backgroundBlendMode: widget.errorBoxDecoration?.backgroundBlendMode,
+      border: widget.errorBoxDecoration?.border,
+      borderRadius: widget.errorBoxDecoration?.borderRadius,
+      boxShadow: widget.errorBoxDecoration?.boxShadow,
+      color: widget.errorBoxDecoration?.color,
+      gradient: widget.errorBoxDecoration?.gradient,
+      image: widget.errorBoxDecoration?.image,
+      shape: widget.errorBoxDecoration?.shape,
+    );
+    _cursorColor = widget.cursorColor ?? Theme.of(context).primaryColor;
+  }
+
+  void _checkErrorOverride() {
+    if ((widget.errorText != null || widget.overrideValidState != null) &&
+        Object.hashAll([widget.errorText, widget.overrideValidState]) !=
+            _prevErrorOverrideHash) {
+      _prevErrorOverrideHash =
+          Object.hashAll([widget.errorText, widget.overrideValidState]);
+      _validateFields();
+    }
+  }
+
   // Makes an http call to stripe API with provided card credentials and returns the result
   Future<Map<String, dynamic>?> getStripeResponse() async {
-    _validateFields();
-
-    if (!_cardDetails.isComplete) {
-      if (kDebugMode)
-        print(
-            'Could not get stripe response, card details not complete: $_cardDetails');
-      return null;
-    }
-    if (widget.onCallToStripe != null) widget.onCallToStripe!();
     if (widget.stripePublishableKey == null) {
       if (kDebugMode)
         print(
-            '***ERROR tried calling `getStripeToken()` but no stripe key provided');
+            '***ERROR tried calling `getStripeResponse()` but no stripe key provided');
       return null;
     }
 
+    _validateFields();
+
+    if (!_cardDetails.isComplete) {
+      if (kDebugMode) {
+        print(
+            '***ERROR Could not get stripe response, card details not complete: ${_cardDetails.validState}');
+      }
+      return null;
+    }
+
+    if (widget.onCallToStripe != null) widget.onCallToStripe!();
+
     bool returned = false;
     Future.delayed(
       widget.delayToShowLoading,
@@ -908,16 +960,19 @@ class CardTextFieldState extends State<CardTextField> {
 
   Future<void> _postalFieldSubmitted() async {
     _validateFields();
+    if (widget.onSubmitted != null) {
+      widget.onSubmitted!(_cardDetails.isComplete ? _cardDetails : null);
+    }
     if (_cardDetails.isComplete) {
       if (widget.onValidCardDetails != null) {
         widget.onValidCardDetails!(_cardDetails);
-      } else if (widget.onStripeResponse != null) {
+      } else if (widget.onStripeResponse != null &&
+          !widget.autoFetchStripektoken) {
         // Callback that stripe call is being made
         if (widget.onCallToStripe != null) widget.onCallToStripe!();
         final jsonBody = await getStripeResponse();
 
-        if (jsonBody != null) widget.onStripeResponse!(jsonBody);
-        if (_loading) setState(() => _loading = false);
+        widget.onStripeResponse!(jsonBody);
       }
     }
   }
@@ -957,12 +1012,13 @@ class CardTextFieldState extends State<CardTextField> {
 
   /// Used when `_isWideFormat == false`, scrolls
   /// the `_horizontalScrollController` to a given offset
-  void _scrollRow(CardEntryStep step) {
+  void _scrollRow(CardEntryStep step) async {
+    await Future.delayed(const Duration(milliseconds: 25));
     const dur = Duration(milliseconds: 150);
     const cur = Curves.easeOut;
     switch (step) {
       case CardEntryStep.number:
-        _horizontalScrollController.animateTo(0.0, duration: dur, curve: cur);
+        _horizontalScrollController.animateTo(-20.0, duration: dur, curve: cur);
         break;
       case CardEntryStep.exp:
         _horizontalScrollController.animateTo(_cardFieldWidth / 2,
@@ -987,14 +1043,14 @@ class CardTextFieldState extends State<CardTextField> {
   /// StreamController. Manages validation and tracking of the current step
   /// as well as scrolling the text fields.
   void _onStepChange(CardEntryStep step) {
+    // Validated fields only when progressing, not when regressing in step
     if (_currentStep.index < step.index) {
       _validateFields();
     } else if (_currentStep != step) {
       _setValidationState(null);
     }
-
     // If field tapped, and has focus, dismiss focus
-    if (_currentStep == step && _hasFocus()) {
+    if (_currentStep == step && _anyHaveFocus()) {
       FocusManager.instance.primaryFocus?.unfocus();
       return;
     }
@@ -1002,7 +1058,7 @@ class CardTextFieldState extends State<CardTextField> {
     setState(() {
       _currentStep = step;
     });
-    switch (step) {
+    switch (_currentStep) {
       case CardEntryStep.number:
         cardNumberFocusNode.requestFocus();
         break;
@@ -1016,28 +1072,54 @@ class CardTextFieldState extends State<CardTextField> {
         postalCodeFocusNode.requestFocus();
         break;
     }
+
+    /// Make the selection adjustment after first frame builds
+    if (kIsWeb)
+      WidgetsBinding.instance.addPostFrameCallback((_) => _adjustSelection());
+
     if (!isWideFormat) {
       _scrollRow(step);
     }
-    // If mobile, and keyboard is closed, unfocus, to allow refocus
-    // print(MediaQuery.of(context).viewInsets.bottom);
-    // if (_isMobile && _hasFocus() && MediaQuery.of(context).viewInsets.bottom == 0.0) {
-    //     cardNumberFocusNode.unfocus();
-    //     expirationFocusNode.unfocus();
-    //     securityCodeFocusNode.unfocus();
-    //     postalCodeFocusNode.unfocus();
-    // }
   }
 
   /// Returns true if any field in the `CardTextField` has focus.
-  // ignore: unused_element
-  bool _hasFocus() {
+  bool _anyHaveFocus() {
     return cardNumberFocusNode.hasFocus ||
         expirationFocusNode.hasFocus ||
         securityCodeFocusNode.hasFocus ||
         postalCodeFocusNode.hasFocus;
   }
 
+  /// On web, selection gets screwy when changing focus, workaround for placing cursor at the end of the text content only
+  void _adjustSelection() {
+    switch (_currentStep) {
+      case CardEntryStep.number:
+        final len = _cardNumberController.text.length;
+        final offset = len == 0 ? 1 : len;
+        _cardNumberController.value = _cardNumberController.value.copyWith(
+            selection: TextSelection(baseOffset: offset, extentOffset: offset));
+        break;
+      case CardEntryStep.exp:
+        final len = _expirationController.text.length;
+        final offset = len == 0 ? 0 : len;
+        _expirationController.value = _expirationController.value.copyWith(
+            selection: TextSelection(baseOffset: offset, extentOffset: offset));
+        break;
+      case CardEntryStep.cvc:
+        final len = _securityCodeController.text.length;
+        final offset = len == 0 ? 0 : len;
+        _securityCodeController.value = _securityCodeController.value.copyWith(
+            selection: TextSelection(baseOffset: offset, extentOffset: offset));
+        break;
+      case CardEntryStep.postal:
+        final len = _postalCodeController.text.length;
+        final offset = len == 0 ? 0 : len;
+        _postalCodeController.value = _postalCodeController.value.copyWith(
+            selection: TextSelection(baseOffset: offset, extentOffset: offset));
+        break;
+    }
+  }
+
   /// Function that is listening to the keyboard events.
   ///
   /// This provides the functionality of hitting backspace
@@ -1049,7 +1131,7 @@ class CardTextFieldState extends State<CardTextField> {
     }
     switch (_currentStep) {
       case CardEntryStep.number:
-        break;
+        return;
       case CardEntryStep.exp:
         if (_expirationController.text.isNotEmpty) return;
       case CardEntryStep.cvc:
@@ -1060,8 +1142,9 @@ class CardTextFieldState extends State<CardTextField> {
     _transitionStepFocus();
   }
 
-  void _backspacePressed() {
-    // Put the empty char back into the controller
+  /// Called whenever a text field is emptied and the mobile flag is set
+  void _mobileBackspaceDetected() {
+    // Put the empty char back into the controller to detect backspace on mobile
     switch (_currentStep) {
       case CardEntryStep.number:
         break;
@@ -1081,18 +1164,22 @@ class CardTextFieldState extends State<CardTextField> {
         break;
       case CardEntryStep.exp:
         _currentCardEntryStepController.add(CardEntryStep.number);
-        String numStr = _cardNumberController.text;
-        _cardNumberController.text = numStr.substring(0, numStr.length - 1);
+
+        final String numStr = _cardNumberController.text;
+        final endIndex = numStr.isEmpty ? 0 : numStr.length - 1;
+        _cardNumberController.text = numStr.substring(0, endIndex);
         break;
       case CardEntryStep.cvc:
         _currentCardEntryStepController.add(CardEntryStep.exp);
-        final expStr = _expirationController.text;
-        _expirationController.text = expStr.substring(0, expStr.length - 1);
+        final String expStr = _expirationController.text;
+        final endIndex = expStr.isEmpty ? 0 : expStr.length - 1;
+        _expirationController.text = expStr.substring(0, endIndex);
         break;
       case CardEntryStep.postal:
         _currentCardEntryStepController.add(CardEntryStep.cvc);
         final String cvcStr = _securityCodeController.text;
-        _securityCodeController.text = cvcStr.substring(0, cvcStr.length - 1);
+        final endIndex = cvcStr.isEmpty ? 0 : cvcStr.length - 1;
+        _securityCodeController.text = cvcStr.substring(0, endIndex);
         break;
     }
   }

pubspec.yaml

@@ -1,11 +1,10 @@
 name: stripe_native_card_field
 description: A native flutter implementation of the elegant Stripe Card Field.
-version: 0.0.6
+version: 0.0.9
 repository: https://git.fosscat.com/n8r/stripe_native_card_field
 
 environment:
-  sdk: '>=3.1.3 <4.0.0'
-  flutter: ">=1.17.0"
+  sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
   flutter: