revamp UI

lib/android/qr_scanner/qr_scanner_overlay_view.dart

@@ -0,0 +1,111 @@
+import 'package:flutter/material.dart';
+
+import 'qr_scanner_scan_status.dart';
+import 'qr_scanner_util.dart';
+
+/// Return the rounded rect which represents the scanner area for the background
+/// overlay and the stroke
+RRect _getScannerAreaRRect(Size size) {
+  double scannerAreaWidth = getScannerAreaWidth(size);
+  var scannerAreaRect = Rect.fromCenter(
+      center: Offset(size.width / 2, size.height / 2),
+      width: scannerAreaWidth,
+      height: scannerAreaWidth);
+
+  return RRect.fromRectAndRadius(
+      scannerAreaRect, const Radius.circular(scannerAreaRadius));
+}
+
+// CustomPainter which strokes the scannerArea
+class _ScannerAreaStrokePainter extends CustomPainter {
+  final Color _strokeColor;
+
+  _ScannerAreaStrokePainter(this._strokeColor) : super();
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    Paint paint = Paint()
+      ..color = _strokeColor
+      ..style = PaintingStyle.stroke
+      ..strokeWidth = 3.0;
+
+    Path path = Path()..addRRect(_getScannerAreaRRect(size));
+    canvas.drawPath(path, paint);
+  }
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
+}
+
+/// clips the scanner area rounded rect of specific Size
+class _ScannerAreaClipper extends CustomClipper<Path> {
+  @override
+  Path getClip(Size size) {
+    return Path()
+      ..addRect(Rect.fromLTWH(0, 0, size.width, size.height))
+      ..addRRect(_getScannerAreaRRect(size))
+      ..fillType = PathFillType.evenOdd;
+  }
+
+  @override
+  bool shouldReclip(covariant CustomClipper<Path> oldClipper) => true;
+}
+
+class QRScannerOverlay extends StatelessWidget {
+  final ScanStatus status;
+  final Size screenSize;
+
+  const QRScannerOverlay({
+    super.key,
+    required this.status,
+    required this.screenSize,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    var size = screenSize;
+
+    return Stack(children: [
+      /// clip scanner area "hole" into a darkened background
+      ClipPath(
+          clipper: _ScannerAreaClipper(),
+          child: Opacity(
+              opacity: 0.6,
+              child: ColoredBox(
+                  color: Colors.black,
+                  child: Column(
+                    mainAxisSize: MainAxisSize.max,
+                    mainAxisAlignment: MainAxisAlignment.center,
+                    crossAxisAlignment: CrossAxisAlignment.stretch,
+                    children: const [Spacer()],
+                  )))),
+
+      /// draw a stroke around the scanner area
+      Column(
+        mainAxisSize: MainAxisSize.max,
+        mainAxisAlignment: MainAxisAlignment.center,
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          CustomPaint(
+            painter: _ScannerAreaStrokePainter(status == ScanStatus.error
+                ? Colors.red.shade400
+                : Colors.green.shade400),
+          ),
+        ],
+      ),
+
+      /// extra icon when successful scan occurred
+      if (status == ScanStatus.success)
+        Positioned.fromRect(
+            rect: Rect.fromCenter(
+                center: Offset(size.width / 2, size.height / 2),
+                width: size.width,
+                height: size.height),
+            child: Icon(
+              Icons.check_circle,
+              size: 200,
+              color: Colors.green.shade400,
+            )),
+    ]);
+  }
+}

lib/android/qr_scanner/qr_scanner_scan_status.dart

@@ -0,0 +1,5 @@
+/// Status of the scanning process
+/// scanning - showing preview and scanning it for finding credential QR code
+/// error - a QR code has been found but is not a credential
+/// success - a QR code has been found and is a usable credential
+enum ScanStatus { scanning, error, success }

lib/android/qr_scanner/qr_scanner_ui_view.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+
+import 'qr_scanner_scan_status.dart';
+import 'qr_scanner_util.dart';
+
+class QRScannerUI extends StatelessWidget {
+  final ScanStatus status;
+  final Size screenSize;
+
+  const QRScannerUI({
+    super.key,
+    required this.status,
+    required this.screenSize,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    var scannerAreaWidth = getScannerAreaWidth(screenSize);
+
+    return Stack(children: [
+      /// instruction text under the scanner area
+      Positioned.fromRect(
+        rect: Rect.fromCenter(
+            center: Offset(screenSize.width / 2,
+                screenSize.height + scannerAreaWidth / 2.0 + 8.0),
+            width: screenSize.width,
+            height: screenSize.height),
+        child: Text(
+          status != ScanStatus.error
+              ? 'Point your camera at a QR code to scan it'
+              : 'Invalid QR code',
+          style: const TextStyle(color: Colors.white),
+          textAlign: TextAlign.center,
+        ),
+      ),
+
+      /// button for manual entry
+      Positioned.fromRect(
+        rect: Rect.fromCenter(
+            center: Offset(screenSize.width / 2,
+                screenSize.height + scannerAreaWidth / 2.0 + 80.0),
+            width: screenSize.width,
+            height: screenSize.height),
+        child: Column(
+          children: [
+            const Text(
+              'No QR code?',
+              textScaleFactor: 0.7,
+              style: TextStyle(color: Colors.white),
+            ),
+            OutlinedButton(
+                onPressed: () {
+                  Navigator.of(context).pop();
+                },
+                child: const Text('Enter manually',
+                    style: TextStyle(color: Colors.white))),
+          ],
+        ),
+      ),
+    ]);
+  }
+}

lib/android/qr_scanner/qr_scanner_util.dart

@@ -0,0 +1,5 @@
+import 'dart:ui';
+
+const double scannerAreaRadius = 40.0;
+
+double getScannerAreaWidth(Size size) => size.width - scannerAreaRadius;

lib/android/qr_scanner/qr_scanner_view.dart

@@ -1,93 +1,14 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:qrscanner_zxing/qrscanner_zxing_view.dart';
 
 import '../../oath/models.dart';
+import 'qr_scanner_overlay_view.dart';
+import 'qr_scanner_scan_status.dart';
+import 'qr_scanner_ui_view.dart';
 
-/// Status of view state
-enum _ScanStatus { looking, error, success }
-
-class OverlayClipper extends CustomClipper<Path> {
-  /// helper method to calculate position of the rect
-  Rect _getOverlayRect(Size size, double width) => Rect.fromCenter(
-      center: Offset(size.width / 2, size.height / 2),
-      width: width,
-      height: width);
-
-  @override
-  Path getClip(Size size) {
-    const r = 40.0;
-    var w = size.width - 40;
-    return Path()
-      ..addRect(Rect.fromLTWH(0, 0, size.width, size.height))
-      ..addRRect(RRect.fromRectXY(_getOverlayRect(size, w), r, r))
-      ..fillType = PathFillType.evenOdd;
-  }
-
-  @override
-  bool shouldReclip(covariant CustomClipper<Path> oldClipper) => true;
-}
-
-class _MobileScannerWrapper extends StatelessWidget {
-  final Function(String) onDetect;
-  final _ScanStatus status;
-
-  const _MobileScannerWrapper({
-    required this.onDetect,
-    required this.status,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    var backgroundColor = status == _ScanStatus.looking
-        ? Colors.white
-        : status == _ScanStatus.error
-            ? Colors.red.shade900
-            : Colors.green.shade900;
-
-    var size = MediaQuery.of(context).size;
-    var positionRect = Rect.fromCenter(
-        center: Offset(size.width / 2, size.height / 2 - 51),
-        width: size.width - 38,
-        height: size.width - 38);
-
-    return Stack(children: [
-      QRScannerZxingView(
-          marginPct: 20,
-          onDetect: (barCode) {
-            onDetect.call(barCode);
-          }),
-      ClipPath(
-          clipper: OverlayClipper(),
-          child: Opacity(
-              opacity: 0.3,
-              child: ColoredBox(
-                  color: backgroundColor,
-                  child: Column(
-                    mainAxisSize: MainAxisSize.max,
-                    mainAxisAlignment: MainAxisAlignment.center,
-                    crossAxisAlignment: CrossAxisAlignment.stretch,
-                    children: const [Spacer()],
-                  )))),
-      if (status == _ScanStatus.success)
-        Positioned.fromRect(
-            rect: positionRect,
-            child: Icon(
-              Icons.check_circle,
-              size: 200,
-              color: Colors.green.shade400,
-            )),
-      if (status == _ScanStatus.error)
-        Positioned.fromRect(
-            rect: positionRect,
-            child: Icon(
-              Icons.error,
-              size: 200,
-              color: Colors.red.shade400,
-            )),
-    ]);
-  }
-}
-
+/// Shows Camera preview, overlay and UI
+/// Handles user interactions
 class QrScannerView extends StatefulWidget {
   const QrScannerView({super.key});
 
@@ -101,12 +22,12 @@ class _QrScannerViewState extends State<QrScannerView> {
   // will be used later
   // ignore: unused_field
   CredentialData? _credentialData;
-  _ScanStatus _status = _ScanStatus.looking;
+  ScanStatus _status = ScanStatus.scanning;
 
   void setError() {
     _credentialData = null;
     _scannedString = null;
-    _status = _ScanStatus.error;
+    _status = ScanStatus.error;
 
     Future.delayed(const Duration(milliseconds: 2000), () {
       resetError();
@@ -117,12 +38,12 @@ class _QrScannerViewState extends State<QrScannerView> {
     setState(() {
       _credentialData = null;
       _scannedString = null;
-      _status = _ScanStatus.looking;
+      _status = ScanStatus.scanning;
     });
   }
 
   void handleResult(String barCode) {
-    if (_status != _ScanStatus.looking) {
+    if (_status != ScanStatus.scanning) {
       // on success and error ignore reported codes
       return;
     }
@@ -132,7 +53,7 @@ class _QrScannerViewState extends State<QrScannerView> {
           var parsedCredential = CredentialData.fromUri(Uri.parse(barCode));
           _credentialData = parsedCredential;
           _scannedString = barCode;
-          _status = _ScanStatus.success;
+          _status = ScanStatus.success;
 
           final navigator = Navigator.of(context);
           Future.delayed(const Duration(milliseconds: 800), () {
@@ -152,68 +73,56 @@ class _QrScannerViewState extends State<QrScannerView> {
     });
   }
 
+  @override
+  void initState() {
+    super.initState();
+    _status = ScanStatus.scanning;
+    SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersive);
+  }
+
+  @override
+  void dispose() {
+    SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual,
+        overlays: SystemUiOverlay.values);
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return SafeArea(
         child: Scaffold(
+      resizeToAvoidBottomInset: false,
+      extendBodyBehindAppBar: true,
+      extendBody: true,
       appBar: AppBar(
-              title: const Text('Scan QR code'),
+        title: const Text(
+          'Add account',
+          style: TextStyle(color: Colors.white),
+        ),
+        backgroundColor: Colors.transparent,
+        foregroundColor: Colors.white,
+        elevation: 0,
         leading: BackButton(
           onPressed: () {
             Navigator.of(context).pop();
           },
         ),
       ),
-            body: Stack(children: [
-              _MobileScannerWrapper(
+      body: Stack(
+        children: [
+          QRScannerZxingView(
+              marginPct: 50,
+              onDetect: (scannedData) => handleResult(scannedData)),
+          QRScannerOverlay(
             status: _status,
-                onDetect: (scannedData) => handleResult(scannedData),
+            screenSize: MediaQuery.of(context).size,
           ),
-              Padding(
-                  padding:
-                      const EdgeInsets.symmetric(vertical: 32, horizontal: 32),
-                  child: Column(
-                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                    mainAxisSize: MainAxisSize.max,
-                    crossAxisAlignment: CrossAxisAlignment.stretch,
-                    children: [
-                      Column(children: [
-                        const SizedBox(
-                          height: 32,
-                        ),
-                        if (_status == _ScanStatus.looking)
-                          Text('Looking for a code...',
-                              style: Theme.of(context)
-                                  .textTheme
-                                  .titleLarge
-                                  ?.copyWith(color: Colors.black)),
-                        if (_status == _ScanStatus.success)
-                          Text('Found a valid code',
-                              style: Theme.of(context)
-                                  .textTheme
-                                  .titleLarge
-                                  ?.copyWith(color: Colors.white)),
-                        if (_status == _ScanStatus.error)
-                          Text('This code is not valid, try again.',
-                              style: Theme.of(context)
-                                  .textTheme
-                                  .titleLarge
-                                  ?.copyWith(color: Colors.white)),
-                      ]),
-                      Row(
-                        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
-                        children: [
-                          MaterialButton(
-                            color: Colors.white38,
-                            onPressed: () {
-                              Navigator.of(context).pop();
-                            },
-                            child: const Text('Add manually'),
+          QRScannerUI(
+            status: _status,
+            screenSize: MediaQuery.of(context).size,
           )
         ],
-                      )
-                    ],
-                  )),
-            ])));
+      ),
+    ));
   }
 }