| 1 | import "dart:io"; |
| 2 | |
| 3 | import "package:flutter/material.dart"; |
| 4 | import "package:flutter/services.dart"; |
| 5 | |
| 6 | class DigitInputController { |
| 7 | String _text = ""; |
| 8 | |
| 9 | String get text => _text; |
| 10 | |
| 11 | set text(String newText) { |
| 12 | _text = newText; |
| 13 | for (final listener in _listeners) { |
| 14 | listener.call(); |
| 15 | } |
| 16 | } |
| 17 | |
| 18 | final List<void Function()> _listeners = []; |
| 19 | |
| 20 | void addListener(void Function() listener) => _listeners.add(listener); |
| 21 | } |
| 22 | |
| 23 | class DigitInputPill extends StatelessWidget { |
| 24 | const DigitInputPill({required this.highlighted, super.key, this.digit}); |
| 25 | |
| 26 | final String? digit; |
| 27 | final bool highlighted; |
| 28 | |
| 29 | @override |
| 30 | Widget build(BuildContext context) => Container( |
| 31 | width: 51, |
| 32 | height: 84, |
| 33 | decoration: BoxDecoration( |
| 34 | color: Theme.of(context).colorScheme.surfaceContainerHigh, |
| 35 | borderRadius: BorderRadius.circular(16), |
| 36 | border: highlighted |
| 37 | ? Border.all(color: Theme.of(context).colorScheme.primary, width: 2) |
| 38 | : null, |
| 39 | ), |
| 40 | child: Center( |
| 41 | child: Padding( |
| 42 | padding: const EdgeInsets.symmetric(vertical: 16), |
| 43 | child: Text(digit ?? " ", style: const TextStyle(fontSize: 40)), |
| 44 | ), |
| 45 | ), |
| 46 | ); |
| 47 | } |
| 48 | |
| 49 | class DigitInput extends StatefulWidget { |
| 50 | const DigitInput({ |
| 51 | required this.controller, |
| 52 | required this.desiredLength, |
| 53 | this.breakAt = 3, |
| 54 | super.key, |
| 55 | }); |
| 56 | |
| 57 | final DigitInputController controller; |
| 58 | final int desiredLength; |
| 59 | final int breakAt; |
| 60 | |
| 61 | @override |
| 62 | State<DigitInput> createState() => _DigitInputState(); |
| 63 | } |
| 64 | |
| 65 | class _DigitInputState extends State<DigitInput> implements TextInputClient { |
| 66 | TextInputConnection? _textInputConnection; |
| 67 | |
| 68 | @override |
| 69 | void initState() { |
| 70 | super.initState(); |
| 71 | _openVirtualKeyboard(); |
| 72 | } |
| 73 | |
| 74 | void _openVirtualKeyboard() { |
| 75 | if (_textInputConnection == null || !_textInputConnection!.attached) { |
| 76 | _textInputConnection = TextInput.attach( |
| 77 | this, |
| 78 | TextInputConfiguration( |
| 79 | inputType: TextInputType.number, |
| 80 | inputAction: Platform.isIOS ? TextInputAction.done : TextInputAction.none, |
| 81 | ), |
| 82 | ); |
| 83 | } |
| 84 | |
| 85 | _textInputConnection!.setEditingState( |
| 86 | TextEditingValue( |
| 87 | text: widget.controller.text, |
| 88 | selection: TextSelection.collapsed(offset: widget.controller.text.length), |
| 89 | ), |
| 90 | ); |
| 91 | _textInputConnection!.show(); |
| 92 | } |
| 93 | |
| 94 | void _closeVirtualKeyboard() => _textInputConnection?.close(); |
| 95 | |
| 96 | @override |
| 97 | void dispose() { |
| 98 | _closeVirtualKeyboard(); |
| 99 | super.dispose(); |
| 100 | } |
| 101 | |
| 102 | @override |
| 103 | Widget build(BuildContext context) => GestureDetector( |
| 104 | onTap: _openVirtualKeyboard, |
| 105 | child: SizedBox( |
| 106 | height: 84, |
| 107 | child: ListView.separated( |
| 108 | scrollDirection: Axis.horizontal, |
| 109 | shrinkWrap: true, |
| 110 | physics: const NeverScrollableScrollPhysics(), |
| 111 | itemBuilder: (context, index) => DigitInputPill( |
| 112 | digit: widget.controller.text.length > index ? widget.controller.text[index] : null, |
| 113 | highlighted: widget.controller.text.length == index, |
| 114 | ), |
| 115 | separatorBuilder: (context, index) => |
| 116 | SizedBox(width: (index + 1) % widget.breakAt == 0 ? 16 : 4), |
| 117 | itemCount: widget.desiredLength, |
| 118 | ), |
| 119 | ), |
| 120 | ); |
| 121 | |
| 122 | @override |
| 123 | void updateEditingValue(TextEditingValue value) { |
| 124 | final RegExp numberRegExp = RegExp(r"^\d{0,6}$"); |
| 125 | |
| 126 | if (numberRegExp.hasMatch(value.text)) { |
| 127 | setState(() => widget.controller.text = value.text); |
| 128 | } else { |
| 129 | // flutter keeps the text editing state regardless of whether you actually used it or not. |
| 130 | // so, if validation fails, we gotta set it back to what it was explicitly |
| 131 | _textInputConnection?.setEditingState( |
| 132 | TextEditingValue( |
| 133 | text: widget.controller.text, |
| 134 | selection: TextSelection.collapsed(offset: widget.controller.text.length), |
| 135 | ), |
| 136 | ); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | @override |
| 141 | void performAction(TextInputAction action) {} |
| 142 | |
| 143 | @override |
| 144 | TextEditingValue? get currentTextEditingValue => TextEditingValue(text: widget.controller.text); |
| 145 | |
| 146 | @override |
| 147 | void connectionClosed() => _textInputConnection = null; |
| 148 | |
| 149 | @override |
| 150 | AutofillScope? get currentAutofillScope => null; |
| 151 | |
| 152 | @override |
| 153 | void performPrivateCommand(String action, Map<String, dynamic> data) {} |
| 154 | |
| 155 | @override |
| 156 | void showAutocorrectionPromptRect(int start, int end) {} |
| 157 | |
| 158 | @override |
| 159 | void updateFloatingCursor(RawFloatingCursorPoint point) {} |
| 160 | |
| 161 | @override |
| 162 | void insertTextPlaceholder(Size size) {} |
| 163 | |
| 164 | @override |
| 165 | void removeTextPlaceholder() {} |
| 166 | |
| 167 | @override |
| 168 | void showToolbar() {} |
| 169 | |
| 170 | @override |
| 171 | void performSelector(String selectorName) {} |
| 172 | |
| 173 | @override |
| 174 | void didChangeInputControl(TextInputControl? oldControl, TextInputControl? newControl) {} |
| 175 | |
| 176 | @override |
| 177 | void insertContent(KeyboardInsertedContent content) {} |
| 178 | } |