Add Barcode and QRCode Widgets

 # Changelog
 
+## 1.3.28
+
+- Add Barcode Widget
+- Add QrCode Widget
+
 ## 1.3.27
 
 - Add Roll Paper support

@@ -22,9 +22,12 @@ import 'dart:typed_data';
 
 import 'package:meta/meta.dart';
 import 'package:pdf/pdf.dart';
+import 'package:qr/qr.dart';
+import 'package:barcode/barcode.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 part 'widgets/annotations.dart';
+part 'widgets/barcode.dart';
 part 'widgets/basic.dart';
 part 'widgets/clip.dart';
 part 'widgets/container.dart';
@@ -40,6 +43,7 @@ part 'widgets/page.dart';
 part 'widgets/page_theme.dart';
 part 'widgets/placeholders.dart';
 part 'widgets/progress.dart';
+part 'widgets/qrcode.dart';
 part 'widgets/stack.dart';
 part 'widgets/table.dart';
 part 'widgets/text.dart';

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// ignore_for_file: omit_local_variable_types
+
+part of widget;
+
+class _BarcodeWidget extends Widget {
+  _BarcodeWidget({
+    @required this.data,
+    this.barcode,
+    this.color = PdfColors.black,
+  });
+
+  /// the barcode data
+  final String data;
+
+  final Barcode barcode;
+
+  final PdfColor color;
+
+  @override
+  void layout(Context context, BoxConstraints constraints,
+      {bool parentUsesSize = false}) {
+    box = PdfRect.fromPoints(PdfPoint.zero, constraints.biggest);
+  }
+
+  @override
+  void paint(Context context) {
+    super.paint(context);
+
+    final BarcodeDraw draw = barcode.draw;
+    if (draw is _BarcodeDraw) {
+      draw
+        ..canvas = context.canvas
+        ..left = box.left
+        ..top = box.top;
+    }
+
+    context.canvas.setFillColor(color);
+    barcode.make(data, box.width, box.height);
+    context.canvas.fillPath();
+  }
+}
+
+class _BarcodeDraw extends BarcodeDraw {
+  PdfGraphics canvas;
+  double left;
+  double top;
+
+  @override
+  void fillRect(
+      double left, double top, double width, double height, bool black) {
+    if (black) {
+      canvas.drawRect(this.left + left, this.top + top - height, width, height);
+    }
+  }
+}
+
+class BarcodeWidget extends StatelessWidget {
+  BarcodeWidget({
+    @required this.data,
+    this.type = BarcodeType.Code39,
+    this.color = PdfColors.black,
+    this.backgroundColor,
+    this.decoration,
+    this.margin,
+    this.padding,
+    this.width,
+    this.height,
+    this.drawText = true,
+    this.textStyle,
+  });
+
+  /// the barcode data
+  final String data;
+
+  final BarcodeType type;
+
+  final PdfColor color;
+
+  final PdfColor backgroundColor;
+
+  final EdgeInsets padding;
+
+  final EdgeInsets margin;
+
+  final double width;
+
+  final double height;
+
+  final bool drawText;
+
+  final TextStyle textStyle;
+
+  final BoxDecoration decoration;
+
+  @override
+  Widget build(Context context) {
+    final TextStyle _textStyle = textStyle ?? TextStyle(font: Font.courier());
+
+    Widget barcode = _BarcodeWidget(
+      data: data,
+      color: color,
+      barcode: Barcode.fromType(
+        type: type,
+        draw: _BarcodeDraw(),
+      ),
+    );
+
+    if (drawText) {
+      barcode = Column(
+        children: <Widget>[
+          Flexible(child: barcode),
+          Text(
+            data,
+            style: _textStyle,
+            textAlign: TextAlign.center,
+            softWrap: false,
+          ),
+        ],
+      );
+    }
+
+    if (padding != null) {
+      barcode = Padding(padding: padding, child: barcode);
+    }
+
+    if (decoration != null) {
+      barcode = DecoratedBox(
+        decoration: decoration,
+        child: barcode,
+      );
+    } else if (backgroundColor != null) {
+      barcode = DecoratedBox(
+        decoration: BoxDecoration(color: backgroundColor),
+        child: barcode,
+      );
+    }
+
+    if (width != null || height != null) {
+      barcode = SizedBox(width: width, height: height, child: barcode);
+    }
+
+    if (margin != null) {
+      barcode = Padding(padding: margin, child: barcode);
+    }
+
+    return barcode;
+  }
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// ignore_for_file: omit_local_variable_types
+
+part of widget;
+
+typedef QrError = void Function(dynamic error);
+
+class _QrCodeWidget extends Widget {
+  _QrCodeWidget({
+    @required String data,
+    this.version,
+    this.errorCorrectionLevel,
+    this.color,
+    this.onError,
+    this.gapless = false,
+  })  : assert(data != null),
+        _qr = version == null
+            ? QrCode.fromData(
+                data: data,
+                errorCorrectLevel: errorCorrectionLevel,
+              )
+            : QrCode(
+                version,
+                errorCorrectionLevel,
+              ) {
+    // configure and make the QR code data
+    try {
+      if (version != null) {
+        _qr.addData(data);
+      }
+      _qr.make();
+    } catch (ex) {
+      if (onError != null) {
+        _hasError = true;
+        onError(ex);
+      }
+    }
+  }
+
+  @override
+  void layout(Context context, BoxConstraints constraints,
+      {bool parentUsesSize = false}) {
+    box = PdfRect.fromPoints(PdfPoint.zero, constraints.biggest);
+  }
+
+  /// the qr code version
+  final int version;
+
+  /// the qr code error correction level
+  final int errorCorrectionLevel;
+
+  /// the color of the dark squares
+  final PdfColor color;
+
+  final QrError onError;
+
+  final bool gapless;
+
+  // our qr code data
+  final QrCode _qr;
+
+  bool _hasError = false;
+
+  @override
+  void paint(Context context) {
+    super.paint(context);
+
+    if (_hasError) {
+      return;
+    }
+
+    final double shortestSide = box.width < box.height ? box.width : box.height;
+    assert(shortestSide > 0);
+
+    context.canvas.setFillColor(color);
+    final double squareSize = shortestSide / _qr.moduleCount.toDouble();
+    final int pxAdjustValue = gapless ? 1 : 0;
+    for (int x = 0; x < _qr.moduleCount; x++) {
+      for (int y = 0; y < _qr.moduleCount; y++) {
+        if (_qr.isDark(y, x)) {
+          context.canvas.drawRect(
+            box.left + x * squareSize,
+            box.top - (y + 1) * squareSize,
+            squareSize + pxAdjustValue,
+            squareSize + pxAdjustValue,
+          );
+        }
+      }
+    }
+
+    context.canvas.fillPath();
+  }
+}
+
+class QrCodeWidget extends StatelessWidget {
+  QrCodeWidget({
+    @required this.data,
+    this.version,
+    this.errorCorrectionLevel = QrErrorCorrectLevel.L,
+    this.color = PdfColors.black,
+    this.backgroundColor,
+    this.decoration,
+    this.margin,
+    this.onError,
+    this.gapless = false,
+    this.size,
+    this.padding,
+  });
+
+  /// the qr code data
+  final String data;
+
+  /// the qr code version
+  final int version;
+
+  /// the qr code error correction level
+  final int errorCorrectionLevel;
+
+  /// the color of the dark squares
+  final PdfColor color;
+
+  final PdfColor backgroundColor;
+
+  final EdgeInsets margin;
+
+  final QrError onError;
+
+  final bool gapless;
+
+  final double size;
+
+  final EdgeInsets padding;
+
+  final BoxDecoration decoration;
+
+  @override
+  Widget build(Context context) {
+    Widget qrcode = AspectRatio(
+        aspectRatio: 1.0,
+        child: _QrCodeWidget(
+          data: data,
+          version: version,
+          errorCorrectionLevel: errorCorrectionLevel,
+          color: color,
+          onError: onError,
+          gapless: gapless,
+        ));
+
+    if (padding != null) {
+      qrcode = Padding(padding: padding, child: qrcode);
+    }
+
+    if (decoration != null) {
+      qrcode = DecoratedBox(
+        decoration: decoration,
+        child: qrcode,
+      );
+    } else if (backgroundColor != null) {
+      qrcode = DecoratedBox(
+        decoration: BoxDecoration(color: backgroundColor),
+        child: qrcode,
+      );
+    }
+
+    if (size != null) {
+      qrcode = SizedBox(width: size, height: size, child: qrcode);
+    }
+
+    if (margin != null) {
+      qrcode = Padding(padding: margin, child: qrcode);
+    }
+
+    return qrcode;
+  }
+}

@@ -4,7 +4,7 @@ description: A pdf producer for Dart. It can create pdf files for both web or fl
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/pdf
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 1.3.27
+version: 1.3.28
 
 environment:
   sdk: ">=2.3.0 <3.0.0"
@@ -15,6 +15,8 @@ dependencies:
   utf: ^0.9.0
   crypto: ^2.0.6
   archive: ^2.0.10
+  qr: ^1.2.0
+  barcode: ^0.1.0
 
 dev_dependencies:
   test:

@@ -28,6 +28,7 @@ import 'orientation_test.dart' as orientation;
 import 'roll_paper_test.dart' as roll;
 import 'ttf_test.dart' as ttf;
 import 'type1_test.dart' as type1;
+import 'widget_barcode_test.dart' as widget_barcode;
 import 'widget_basic_test.dart' as widget_basic;
 import 'widget_clip_test.dart' as widget_clip;
 import 'widget_container_test.dart' as widget_container;
@@ -54,6 +55,7 @@ void main() {
   ttf.main();
   type1.main();
   widget_basic.main();
+  widget_barcode.main();
   widget_clip.main();
   widget_container.main();
   widget_flex.main();

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// ignore_for_file: omit_local_variable_types
+
+import 'dart:io';
+
+import 'package:pdf/pdf.dart';
+import 'package:pdf/widgets.dart';
+import 'package:test/test.dart';
+
+Document pdf;
+
+void main() {
+  setUpAll(() {
+    Document.debug = true;
+    pdf = Document();
+  });
+
+  test('Barcode Widgets Code39', () {
+    pdf.addPage(
+      Page(
+        build: (Context context) => BarcodeWidget(
+          data: 'HELLO 123',
+          width: 200,
+          height: 50,
+        ),
+      ),
+    );
+  });
+
+  test('QrCode Widgets', () {
+    pdf.addPage(
+      Page(
+        build: (Context context) => QrCodeWidget(
+          data: 'HELLO 123',
+          size: 200,
+          padding: const EdgeInsets.all(20),
+          margin: const EdgeInsets.all(20),
+          decoration: BoxDecoration(
+              borderRadius: 20,
+              color: PdfColors.white,
+              border: BoxBorder(
+                color: PdfColors.blue,
+                top: true,
+                bottom: true,
+                left: true,
+                right: true,
+              )),
+        ),
+      ),
+    );
+  });
+
+  tearDownAll(() {
+    final File file = File('widgets-barcode.pdf');
+    file.writeAsBytesSync(pdf.save());
+  });
+}

 import 'package:meta/meta.dart';
 import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart';
-import 'package:qr/qr.dart';
 
 const PdfColor green = PdfColor.fromInt(0xff9ce5d0);
 const PdfColor lightGreen = PdfColor.fromInt(0xffcdf1e7);
@@ -109,152 +108,6 @@ class Category extends StatelessWidget {
   }
 }
 
-typedef QrError = void Function(dynamic error);
-
-class _QrCodeWidget extends Widget {
-  _QrCodeWidget({
-    @required String data,
-    this.version,
-    this.errorCorrectionLevel,
-    this.color,
-    this.onError,
-    this.gapless = false,
-  })  : assert(data != null),
-        _qr = version == null
-            ? QrCode.fromData(
-                data: data,
-                errorCorrectLevel: errorCorrectionLevel,
-              )
-            : QrCode(
-                version,
-                errorCorrectionLevel,
-              ) {
-    // configure and make the QR code data
-    try {
-      if (version != null) {
-        _qr.addData(data);
-      }
-      _qr.make();
-    } catch (ex) {
-      if (onError != null) {
-        _hasError = true;
-        onError(ex);
-      }
-    }
-  }
-
-  @override
-  void layout(Context context, BoxConstraints constraints,
-      {bool parentUsesSize = false}) {
-    box = PdfRect.fromPoints(PdfPoint.zero, constraints.biggest);
-  }
-
-  /// the qr code version
-  final int version;
-
-  /// the qr code error correction level
-  final int errorCorrectionLevel;
-
-  /// the color of the dark squares
-  final PdfColor color;
-
-  final QrError onError;
-
-  final bool gapless;
-
-  // our qr code data
-  final QrCode _qr;
-
-  bool _hasError = false;
-
-  @override
-  void paint(Context context) {
-    super.paint(context);
-
-    if (_hasError) {
-      return;
-    }
-
-    final double shortestSide = box.width < box.height ? box.width : box.height;
-    assert(shortestSide > 0);
-
-    context.canvas.setFillColor(color);
-    final double squareSize = shortestSide / _qr.moduleCount.toDouble();
-    final int pxAdjustValue = gapless ? 1 : 0;
-    for (int x = 0; x < _qr.moduleCount; x++) {
-      for (int y = 0; y < _qr.moduleCount; y++) {
-        if (_qr.isDark(y, x)) {
-          context.canvas.drawRect(
-            box.left + x * squareSize,
-            box.top - (y + 1) * squareSize,
-            squareSize + pxAdjustValue,
-            squareSize + pxAdjustValue,
-          );
-        }
-      }
-    }
-
-    context.canvas.fillPath();
-  }
-}
-
-class QrCodeWidget extends StatelessWidget {
-  QrCodeWidget({
-    @required this.data,
-    this.version,
-    this.errorCorrectionLevel = QrErrorCorrectLevel.L,
-    this.color = PdfColors.black,
-    this.onError,
-    this.gapless = false,
-    this.size,
-    this.padding,
-  });
-
-  /// the qr code data
-  final String data;
-
-  /// the qr code version
-  final int version;
-
-  /// the qr code error correction level
-  final int errorCorrectionLevel;
-
-  /// the color of the dark squares
-  final PdfColor color;
-
-  final QrError onError;
-
-  final bool gapless;
-
-  final double size;
-
-  final EdgeInsets padding;
-
-  @override
-  Widget build(Context context) {
-    Widget qrcode = AspectRatio(
-        aspectRatio: 1.0,
-        child: _QrCodeWidget(
-          data: data,
-          version: version,
-          errorCorrectionLevel: errorCorrectionLevel,
-          color: color,
-          onError: onError,
-          gapless: gapless,
-        ));
-
-    if (padding != null) {
-      qrcode = Padding(padding: padding, child: qrcode);
-    }
-
-    if (size != null) {
-      qrcode = SizedBox(width: size, height: size, child: qrcode);
-    }
-
-    return qrcode;
-  }
-}
-
 class Percent extends StatelessWidget {
   Percent({
     @required this.size,

@@ -13,7 +13,6 @@ dependencies:
   path_provider:
   flutter_full_pdf_viewer:
   cupertino_icons:
-  qr:
   markdown:
 
 dev_dependencies: