From d09c9ebc39adc1b04483736598b020f6cd20514f Mon Sep 17 00:00:00 2001
From: Khoren Markosyan <khoren.markosyan@gmail.com>
Date: Mon, 6 Jun 2022 13:45:13 +0400
Subject: [PATCH] added flash support

---
 example/pubspec.lock   |  2 +-
 lib/reader_widget.dart | 68 ++++++++++++++++++++++++++++++++----------
 zxscanner/pubspec.lock |  4 +--
 zxscanner/pubspec.yaml |  2 +-
 4 files changed, 57 insertions(+), 19 deletions(-)

diff --git a/example/pubspec.lock b/example/pubspec.lock
index 1cc25db..04054b6 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -141,7 +141,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.1.3"
+    version: "0.2.0"
   font_awesome_flutter:
     dependency: "direct main"
     description:
diff --git a/lib/reader_widget.dart b/lib/reader_widget.dart
index a138d07..c00433e 100644
--- a/lib/reader_widget.dart
+++ b/lib/reader_widget.dart
@@ -18,7 +18,8 @@ class ReaderWidget extends StatefulWidget {
     this.codeFormat = Format.Any,
     this.beep = true,
     this.showCroppingRect = true,
-    this.scanDelay = const Duration(milliseconds: 500), // 500ms delay
+    this.showFlashlight = true,
+    this.scanDelay = const Duration(milliseconds: 1000), // 1000ms delay
     this.cropPercent = 0.5, // 50% of the screen
     this.resolution = ResolutionPreset.high,
   }) : super(key: key);
@@ -28,6 +29,7 @@ class ReaderWidget extends StatefulWidget {
   final int codeFormat;
   final bool beep;
   final bool showCroppingRect;
+  final bool showFlashlight;
   final Duration scanDelay;
   final double cropPercent;
   final ResolutionPreset resolution;
@@ -112,6 +114,7 @@ class _ReaderWidgetState extends State<ReaderWidget>
 
     try {
       await controller?.initialize();
+      await controller?.setFlashMode(FlashMode.off);
       controller?.startImageStream(processCameraImage);
     } on CameraException catch (e) {
       debugPrint('${e.code}: ${e.description}');
@@ -202,22 +205,57 @@ class _ReaderWidgetState extends State<ReaderWidget>
               ),
             ),
           ),
-          widget.showCroppingRect
-              ? Container(
-                  decoration: ShapeDecoration(
-                    shape: ScannerOverlay(
-                      borderColor: Theme.of(context).primaryColor,
-                      overlayColor: const Color.fromRGBO(0, 0, 0, 0.5),
-                      borderRadius: 1,
-                      borderLength: 16,
-                      borderWidth: 8,
-                      cutOutSize: cropSize,
-                    ),
-                  ),
-                )
-              : Container()
+          if (widget.showCroppingRect)
+            Container(
+              decoration: ShapeDecoration(
+                shape: ScannerOverlay(
+                  borderColor: Theme.of(context).primaryColor,
+                  overlayColor: const Color.fromRGBO(0, 0, 0, 0.5),
+                  borderRadius: 1,
+                  borderLength: 16,
+                  borderWidth: 8,
+                  cutOutSize: cropSize,
+                ),
+              ),
+            ),
+          if (widget.showFlashlight)
+            Positioned(
+              top: 20,
+              left: 20,
+              child: FloatingActionButton(
+                onPressed: () {
+                  FlashMode mode = cameraController.value.flashMode;
+                  switch (mode) {
+                    case FlashMode.torch:
+                      mode = FlashMode.off;
+                      break;
+                    case FlashMode.off:
+                      mode = FlashMode.torch;
+                      break;
+                    default:
+                  }
+                  cameraController.setFlashMode(mode);
+                  setState(() {});
+                },
+                mini: true,
+                backgroundColor: Colors.black26,
+                child: Icon(_flashIcon(cameraController)),
+              ),
+            )
         ],
       );
     }
   }
+
+  IconData _flashIcon(CameraController cameraController) {
+    final FlashMode mode = cameraController.value.flashMode;
+    switch (mode) {
+      case FlashMode.torch:
+        return Icons.flash_on;
+      case FlashMode.off:
+        return Icons.flash_off;
+      default:
+        return Icons.flash_off;
+    }
+  }
 }
diff --git a/zxscanner/pubspec.lock b/zxscanner/pubspec.lock
index 4b6247c..391758a 100644
--- a/zxscanner/pubspec.lock
+++ b/zxscanner/pubspec.lock
@@ -300,7 +300,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.1.3"
+    version: "0.2.0"
   font_awesome_flutter:
     dependency: "direct main"
     description:
@@ -629,7 +629,7 @@ packages:
       name: share_plus
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.0.6"
+    version: "4.0.7"
   share_plus_linux:
     dependency: transitive
     description:
diff --git a/zxscanner/pubspec.yaml b/zxscanner/pubspec.yaml
index 0be9e7c..68e3b9c 100644
--- a/zxscanner/pubspec.yaml
+++ b/zxscanner/pubspec.yaml
@@ -27,7 +27,7 @@ dependencies:
   intl: ^0.17.0
   mobx: ^2.0.7
   path_provider: ^2.0.10
-  share_plus: ^4.0.6
+  share_plus: ^4.0.7
   shared_preferences: ^2.0.15
   url_launcher: ^6.1.2