CWA-209 | applied new design to receive page

lib/src/screens/receive/widgets/qr_image.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+import 'package:qr/qr.dart';
+import 'package:cake_wallet/src/screens/receive/widgets/qr_painter.dart';
+
+class QrImage extends StatelessWidget {
+  QrImage({
+    @required String data,
+    this.size = 100.0,
+    this.backgroundColor,
+    Color foregroundColor = Colors.black,
+    int version = 7,
+    int errorCorrectionLevel = QrErrorCorrectLevel.L,
+  }) : _painter = QrPainter(data, foregroundColor, version, errorCorrectionLevel);
+
+  final QrPainter _painter;
+  final Color backgroundColor;
+  final double size;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      width: size,
+      height: size,
+      color: backgroundColor,
+      child: CustomPaint(
+        painter: _painter,
+      ),
+    );
+  }
+}

lib/src/screens/receive/widgets/qr_painter.dart

@@ -0,0 +1,48 @@
+import 'package:flutter/material.dart';
+import 'package:qr/qr.dart';
+
+class QrPainter extends CustomPainter {
+  QrPainter(
+    String data,
+    this.color,
+    this.version,
+    this.errorCorrectionLevel,
+  ) : this._qr = QrCode(version, errorCorrectionLevel) {
+    _p.color = this.color;
+
+    _qr.addData(data);
+    _qr.make();
+  }
+
+  final int version;
+  final int errorCorrectionLevel;
+  final Color color;
+
+  final QrCode _qr;
+  final _p = Paint()..style = PaintingStyle.fill;
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    final squareSize = size.shortestSide / _qr.moduleCount;
+    for (int x = 0; x < _qr.moduleCount; x++) {
+      for (int y = 0; y < _qr.moduleCount; y++) {
+        if (_qr.isDark(y, x)) {
+          final squareRect = Rect.fromLTWH(
+              x * squareSize, y * squareSize, squareSize, squareSize);
+          canvas.drawRect(squareRect, _p);
+        }
+      }
+    }
+  }
+
+  @override
+  bool shouldRepaint(CustomPainter oldDelegate) {
+    if (oldDelegate is QrPainter) {
+      return this.color != oldDelegate.color ||
+          this.errorCorrectionLevel != oldDelegate.errorCorrectionLevel ||
+          this.version != oldDelegate.version;
+    }
+    
+    return false;
+  }
+}