add flashlight and camera switch

cake-tech · Jul 17, 2024 · 5c105f1 · 5c105f1
1 parent 13be92f
commit 5c105f1
Showing 1 changed file with 102 additions and 1 deletion.
diff --git a/lib/entities/qr_scanner.dart b/lib/entities/qr_scanner.dart
@@ -49,18 +49,119 @@ class _BarcodeScannerSimpleState extends State<BarcodeScannerSimple> {
     }
   }
 
+  final MobileScannerController ctrl = MobileScannerController();
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text('Scan')),
+      appBar: AppBar(
+        title: const Text('Scan'),
+        actions: [
+          SwitchCameraButton(controller: ctrl),
+          ToggleFlashlightButton(controller: ctrl),
+        ],
+      ),
       backgroundColor: Colors.black,
       body: Stack(
         children: [
           MobileScanner(
             onDetect: _handleBarcode,
+            controller: ctrl,
           ),
         ],
       ),
     );
   }
 }
+
+
+class ToggleFlashlightButton extends StatelessWidget {
+  const ToggleFlashlightButton({required this.controller, super.key});
+
+  final MobileScannerController controller;
+
+  @override
+  Widget build(BuildContext context) {
+    return ValueListenableBuilder(
+      valueListenable: controller,
+      builder: (context, state, child) {
+        if (!state.isInitialized || !state.isRunning) {
+          return const SizedBox.shrink();
+        }
+
+        switch (state.torchState) {
+          case TorchState.auto:
+            return IconButton(
+              iconSize: 32.0,
+              icon: const Icon(Icons.flash_auto),
+              onPressed: () async {
+                await controller.toggleTorch();
+              },
+            );
+          case TorchState.off:
+            return IconButton(
+              iconSize: 32.0,
+              icon: const Icon(Icons.flash_off),
+              onPressed: () async {
+                await controller.toggleTorch();
+              },
+            );
+          case TorchState.on:
+            return IconButton(
+              iconSize: 32.0,
+              icon: const Icon(Icons.flash_on),
+              onPressed: () async {
+                await controller.toggleTorch();
+              },
+            );
+          case TorchState.unavailable:
+            return const Icon(
+              Icons.no_flash,
+              color: Colors.grey,
+            );
+        }
+      },
+    );
+  }
+}
+
+class SwitchCameraButton extends StatelessWidget {
+  const SwitchCameraButton({required this.controller, super.key});
+
+  final MobileScannerController controller;
+
+  @override
+  Widget build(BuildContext context) {
+    return ValueListenableBuilder(
+      valueListenable: controller,
+      builder: (context, state, child) {
+        if (!state.isInitialized || !state.isRunning) {
+          return const SizedBox.shrink();
+        }
+
+        final int? availableCameras = state.availableCameras;
+
+        if (availableCameras != null && availableCameras < 2) {
+          return const SizedBox.shrink();
+        }
+
+        final Widget icon;
+
+        switch (state.cameraDirection) {
+          case CameraFacing.front:
+            icon = const Icon(Icons.camera_front);
+          case CameraFacing.back:
+            icon = const Icon(Icons.camera_rear);
+        }
+
+        return IconButton(
+          iconSize: 32.0,
+          icon: icon,
+          onPressed: () async {
+            await controller.switchCamera();
+          },
+        );
+      },
+    );
+  }
+}