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flutter_zxing
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added more validations in encoding codes

pull/76/head
Khoren Markosyan 2 years ago
parent
fae705a1de
commit
6b722ca7fd
3 changed files with 103 additions and 23 deletions
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  1. 2
      lib/src/logic/zxing.dart
  2. 75
      lib/src/models/format.dart
  3. 49
      lib/src/ui/writer_widget.dart

2
lib/src/logic/zxing.dart
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@ -29,7 +29,7 @@ void setZxingLogEnabled(bool enabled) =>
bindings.setLogEnabled(enabled ? 1 : 0);
/// Returns a readable barcode format name
String zxingBarcodeFormatName(int format) => formatNames[format] ?? 'Unknown';
String zxingBarcodeFormatName(int format) => barcodeNames[format] ?? 'Unknown';
extension Uint8ListBlobConversion on Uint8List {
/// Allocates a pointer filled with the Uint8List data.

75
lib/src/models/format.dart
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@ -35,22 +35,24 @@ abstract class Format {
static const int any = oneDCodes | twoDCodes;
}
extension EccSupportedExtension on int {
extension CodeFormat on int {
String get name => barcodeNames[this] ?? 'Unknown';
// The width divided by the height of the barcode
double get ratio => barcodeRatios[this] ?? 1.0;
String get demoText => barcodeDemoText[this] ?? '';
int get maxTextLength => barcodeMaxTextLengths[this] ?? 0;
bool get isSupportedEccLevel => eccSupported.contains(this);
static final List<int> eccSupported = <int>[
Format.qrCode,
];
}
extension CodeFormat on Format {
String get name => formatNames[this] ?? 'Unknown';
static final List<int> writerFormats = <int>[
static final List<int> supportedEncodeFormats = <int>[
Format.qrCode,
Format.dataMatrix,
Format.aztec,
Format.pdf417,
// Format.pdf417,
Format.codabar,
Format.code39,
Format.code93,
@ -66,7 +68,7 @@ extension CodeFormat on Format {
];
}
final Map<int, String> formatNames = <int, String>{
final Map<int, String> barcodeNames = <int, String>{
Format.none: 'None',
Format.aztec: 'Aztec',
Format.codabar: 'CodaBar',
@ -88,3 +90,60 @@ final Map<int, String> formatNames = <int, String>{
Format.twoDCodes: 'TwoD',
Format.any: 'Any',
};
final Map<int, double> barcodeRatios = <int, double>{
Format.aztec: 3.0 / 3.0, // recommended ratio: 3:3 (square)
Format.codabar: 3.0 / 1.0, // recommended ratio: 3:1
Format.code39: 3.0 / 1.0, // recommended ratio: 3:1
Format.code93: 3.0 / 1.0, // recommended ratio: 3:1
Format.code128: 2.0 / 1.0, // recommended ratio: 2:1
Format.dataBar: 3.0 / 1.0, // recommended ratio: 3:1
Format.dataBarExpanded: 1.0 / 1.0, // recommended ratio: 1:1 (square)
Format.dataMatrix: 3.0 / 3.0, // recommended ratio: 3:3 (square)
Format.ean8: 3.0 / 1.0, // recommended ratio: 3:1
Format.ean13: 3.0 / 1.0, // recommended ratio: 3:1
Format.itf: 3.0 / 1.0, // recommended ratio: 3:1
Format.maxiCode: 3.0 / 3.0, // recommended ratio: 3:3 (square)
Format.pdf417: 3.0 / 1.0, // recommended ratio: 3:1
Format.qrCode: 3.0 / 3.0, // recommended ratio: 3:3 (square)
Format.upca: 3.0 / 1.0, // recommended ratio: 3:1
Format.upce: 1.0 / 1.0, // recommended ratio: 1:1 (square)
};
final Map<int, String> barcodeDemoText = <int, String>{
Format.aztec: 'This is an Aztec Code',
Format.codabar: 'A123456789B',
Format.code39: 'ABC-1234',
Format.code93: 'ABC-1234-/+',
Format.code128: 'ABC-abc-1234',
Format.dataBar: '0123456789012',
Format.dataBarExpanded: '011234567890123-ABCabc',
Format.dataMatrix: 'This is a Data Matrix',
Format.ean8: '9031101',
Format.ean13: '978020137962',
Format.itf: '00012345600012',
Format.maxiCode: 'This is a MaxiCode',
Format.pdf417: 'This is a PDF417',
Format.qrCode: 'This is a QR Code',
Format.upca: '72527273070',
Format.upce: '0123456',
};
final Map<int, int> barcodeMaxTextLengths = <int, int>{
Format.aztec: 3832,
Format.codabar: 20,
Format.code39: 43,
Format.code93: 47,
Format.code128: 2046,
Format.dataBar: 74,
Format.dataBarExpanded: 4107,
Format.dataMatrix: 2335,
Format.ean8: 8,
Format.ean13: 13,
Format.itf: 20,
Format.maxiCode: 30,
Format.pdf417: 2953,
Format.qrCode: 4296,
Format.upca: 12,
Format.upce: 8,
};

49
lib/src/ui/writer_widget.dart
Unescape View File

@ -9,10 +9,9 @@ import '../../flutter_zxing.dart';
class WriterWidget extends StatefulWidget {
const WriterWidget({
super.key,
this.text = '',
this.text,
this.format = Format.qrCode,
this.width = 120,
this.height = 120,
this.height = 120, // Width is calculated from height and format ratio
this.margin = 0,
this.eccLevel = EccLevel.low,
this.messages = const Messages(),
@ -20,9 +19,8 @@ class WriterWidget extends StatefulWidget {
this.onError,
});
final String text;
final String? text;
final int format;
final int width;
final int height;
final int margin;
final EccLevel eccLevel;
@ -44,8 +42,7 @@ class _WriterWidgetState extends State<WriterWidget>
bool isAndroid() => Theme.of(context).platform == TargetPlatform.android;
final int _maxTextLength = 2000;
final List<int> _supportedFormats = CodeFormat.writerFormats;
final List<int> _supportedFormats = CodeFormat.supportedEncodeFormats;
int _codeFormat = Format.qrCode;
EccLevel _eccLevel = EccLevel.low;
@ -60,12 +57,13 @@ class _WriterWidgetState extends State<WriterWidget>
@override
void initState() {
_textController.text = widget.text;
_widthController.text = widget.width.toString();
_codeFormat = widget.format;
_eccLevel = widget.eccLevel;
_textController.text = widget.text ?? _codeFormat.demoText;
_widthController.text =
(widget.height * _codeFormat.ratio).round().toString();
_heightController.text = widget.height.toString();
_marginController.text = widget.margin.toString();
_eccLevel = widget.eccLevel;
_codeFormat = widget.format;
super.initState();
}
@ -95,7 +93,7 @@ class _WriterWidgetState extends State<WriterWidget>
controller: _textController,
keyboardType: TextInputType.multiline,
maxLines: null,
maxLength: _maxTextLength,
maxLength: _codeFormat.maxTextLength,
onChanged: (String value) {
setState(() {});
},
@ -104,7 +102,7 @@ class _WriterWidgetState extends State<WriterWidget>
filled: true,
labelText: messages.textLabel,
counterText:
'${_textController.value.text.length} / $_maxTextLength',
'${_textController.value.text.length} / ${_codeFormat.maxTextLength}',
),
validator: (String? value) {
if (value?.isEmpty ?? false) {
@ -134,6 +132,12 @@ class _WriterWidgetState extends State<WriterWidget>
onChanged: (int? format) {
setState(() {
_codeFormat = format ?? Format.qrCode;
_textController.text = _codeFormat.demoText;
_heightController.text = widget.height.toString();
_widthController.text =
(widget.height * _codeFormat.ratio)
.round()
.toString();
});
},
),
@ -182,6 +186,15 @@ class _WriterWidgetState extends State<WriterWidget>
}
return null;
},
onChanged: (String value) {
// use format ratio to calculate height
final int? width = int.tryParse(value);
if (width != null) {
final int height =
(width / _codeFormat.ratio).round();
_heightController.text = height.toString();
}
},
),
),
// const SizedBox(width: 8),
@ -199,6 +212,15 @@ class _WriterWidgetState extends State<WriterWidget>
}
return null;
},
onChanged: (String value) {
// use format ratio to calculate width
final int? height = int.tryParse(value);
if (height != null) {
final int width =
(height * _codeFormat.ratio).round();
_widthController.text = width.toString();
}
},
),
),
Flexible(
@ -219,7 +241,6 @@ class _WriterWidgetState extends State<WriterWidget>
),
],
),
const SizedBox(height: 20),
// Write button
ElevatedButton(

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