Barcode Scanning Updates (#448)

* Add new setting for controlling manual barcode scan

* Adds ability to pause and resume scanning with button

- Camera is still "live" during this

* Add UI elements

* Change scan setting

- "Continuous" scanning
- Enabled by default

* Update release notes

* Scanner updates

- Use "hold to pause" in continuous scan
- Use "tap to pause" in single scan

* Improve barcode scanning options

- Allow tap-to-pause or hold-to-pause
- More obvious user interactions

* Ensure consistent icon placement

* Remove separate setting for barcode pause mode

assets/release_notes.md

@@ -2,8 +2,11 @@
 ---
 
 - Adds support for Sales Orders
+- Adds option to pause and resume barcode scanning with camera
+- Adds option for "single shot" barcode scanning with camera
 - Fixes bug when removing entire quantity of a stock item
 
+
 ### 0.13.0 - October 2023
 ---
 

lib/barcode/camera_controller.dart

@@ -1,5 +1,8 @@
 import "dart:io";
 import "package:flutter/material.dart";
+import "package:font_awesome_flutter/font_awesome_flutter.dart";
+import "package:inventree/app_colors.dart";
+import "package:inventree/preferences.dart";
 
 import "package:qr_code_scanner/qr_code_scanner.dart";
 
@@ -13,30 +16,54 @@ import "package:inventree/barcode/controller.dart";
  * Under the hood it uses the qr_code_scanner package.
  */
 class CameraBarcodeController extends InvenTreeBarcodeController {
-
-  const CameraBarcodeController(BarcodeHandler handler, {Key? key}) : super(handler, key: key);
+  const CameraBarcodeController(BarcodeHandler handler, {Key? key})
+      : super(handler, key: key);
 
   @override
   State<StatefulWidget> createState() => _CameraBarcodeControllerState();
-
 }
 
-
 class _CameraBarcodeControllerState extends InvenTreeBarcodeControllerState {
-
   _CameraBarcodeControllerState() : super();
 
   QRViewController? _controller;
 
   bool flash_status = false;
 
+  bool single_scanning = false;
+  bool scanning_paused = false;
+
+  Future<void> _loadSettings() async {
+    bool _single = await InvenTreeSettingsManager()
+        .getBool(INV_BARCODE_SCAN_SINGLE, false);
+
+    if (mounted) {
+      setState(() {
+        single_scanning = _single;
+        scanning_paused = false;
+      });
+    }
+  }
+
   /* Callback function when the Barcode scanner view is initially created */
   void _onViewCreated(BuildContext context, QRViewController controller) {
     _controller = controller;
 
     controller.scannedDataStream.listen((barcode) {
-      handleBarcodeData(barcode.code);
+      if (!scanning_paused) {
+        handleBarcodeData(barcode.code).then((value) => {
+              // If in single-scanning mode, pause after successful scan
+              if (single_scanning && mounted)
+                {
+                  setState(() {
+                    scanning_paused = true;
+                  })
+                }
+            });
+      }
     });
+
+    _loadSettings();
   }
 
   // In order to get hot reload to work we need to pause the camera if the platform
@@ -71,7 +98,6 @@ class _CameraBarcodeControllerState extends InvenTreeBarcodeControllerState {
 
   @override
   Future<void> resumeScan() async {
-
     // Do not attempt to resume if the widget is not mounted
     if (!mounted) {
       return;
@@ -97,17 +123,25 @@ class _CameraBarcodeControllerState extends InvenTreeBarcodeControllerState {
 
   @override
   Widget build(BuildContext context) {
+    Widget actionIcon =
+        FaIcon(FontAwesomeIcons.circlePause, color: COLOR_WARNING, size: 64);
+
+    if (scanning_paused) {
+      actionIcon =
+          FaIcon(FontAwesomeIcons.circlePlay, color: COLOR_ACTION, size: 64);
+    }
+
+    String info_text = scanning_paused ? L10().barcodeScanPaused : L10().barcodeScanPause;
 
     return Scaffold(
         appBar: AppBar(
           title: Text(L10().scanBarcode),
           actions: [
             IconButton(
-              icon: Icon(Icons.flip_camera_android),
-              onPressed: () {
-                _controller?.flipCamera();
-              }
-            ),
+                icon: Icon(Icons.flip_camera_android),
+                onPressed: () {
+                  _controller?.flipCamera();
+                }),
             IconButton(
               icon: flash_status ? Icon(Icons.flash_off) : Icon(Icons.flash_on),
               onPressed: () {
@@ -117,44 +151,71 @@ class _CameraBarcodeControllerState extends InvenTreeBarcodeControllerState {
             )
           ],
         ),
-        body: Stack(
-          children: <Widget>[
-            Column(
-              children: [
-                Expanded(
-                  child: QRView(
+        body: GestureDetector(
+            onTapDown: (details) async {
+              setState(() {
+                scanning_paused = !scanning_paused;
+              });
+            },
+            onLongPressEnd: (details) async {
+              if (mounted) {
+                setState(() {
+                  scanning_paused = false;
+                });
+              }
+            },
+            child: Stack(
+              children: <Widget>[
+                Column(children: [
+                  Expanded(
+                      child: QRView(
                     key: barcodeControllerKey,
                     onQRViewCreated: (QRViewController controller) {
                       _onViewCreated(context, controller);
                     },
                     overlay: QrScannerOverlayShape(
-                      borderColor: Colors.red,
+                      borderColor:
+                          scanning_paused ? COLOR_WARNING : COLOR_ACTION,
                       borderRadius: 10,
                       borderLength: 30,
                       borderWidth: 10,
                       cutOutSize: 300,
                     ),
-                  )
-                )
-              ]
-            ),
-            Center(
-                child: Column(
-                    children: [
-                      Spacer(),
-                      Padding(
-                        child: Text(widget.handler.getOverlayText(context),
-                          style: TextStyle(
-                              fontWeight: FontWeight.bold,
-                              color: Colors.white),
-                        ),
-                        padding: EdgeInsets.all(20),
+                  ))
+                ]),
+                Center(
+                    child: Column(children: [
+                  Padding(
+                      child: Text(
+                        widget.handler.getOverlayText(context),
+                        style: TextStyle(
+                          fontSize: 16,
+                            fontWeight: FontWeight.bold, color: Colors.white),
                       ),
-                    ]
-                )
-            )
-          ],
-        )
-    );
+                      padding: EdgeInsets.all(25)),
+                  Padding(
+                    child: CircularProgressIndicator(
+                        value: scanning_paused ? 0 : null),
+                    padding: EdgeInsets.all(40),
+                  ),
+                  Spacer(),
+                  SizedBox(
+                    child: Center(
+                      child: actionIcon,
+                    ),
+                    width: 100,
+                    height: 150,
+                  ),
+                  Padding(
+                    child: Text(info_text,
+                        textAlign: TextAlign.center,
+                        style: TextStyle(
+                          color: Colors.white,
+                        )),
+                    padding: EdgeInsets.all(25),
+                  ),
+                ]))
+              ],
+            )));
   }
 }

lib/l10n/app_en.arb

@@ -115,6 +115,12 @@
   "barcodeReceivePart": "Scan barcode to receive part",
   "@barcodeReceivePart": {},
 
+  "barcodeScanPaused": "Barcode scanning paused",
+  "@barodeScanPaused": {},
+
+  "barcodeScanPause": "Tap or hold to pause scanning",
+  "@barcodeScanPause": {},
+
   "barcodeScanAssign": "Scan to assign barcode",
   "@barcodeScanAssign": {},
 
@@ -139,6 +145,12 @@
   "barcodeScanLocation": "Scan stock location",
   "@barcodeScanLocation": {},
 
+  "barcodeScanSingle": "Single Scan Mode",
+  "@barcodeScanSingle": {},
+
+  "barcodeScanSingleDetail": "Pause barcode scanner after each scan",
+  "@barcodeScanSingleDetail": {},
+
   "barcodeScanIntoLocationSuccess": "Scanned into location",
   "@barcodeScanIntoLocationSuccess": {},
 

lib/preferences.dart

@@ -42,6 +42,7 @@ const String INV_STRICT_HTTPS = "strictHttps";
 // Barcode settings
 const String INV_BARCODE_SCAN_DELAY = "barcodeScanDelay";
 const String INV_BARCODE_SCAN_TYPE = "barcodeScanType";
+const String INV_BARCODE_SCAN_SINGLE = "barcodeScanSingle";
 
 // Barcode scanner types
 const int BARCODE_CONTROLLER_CAMERA = 0;

lib/settings/barcode_settings.dart

@@ -18,6 +18,7 @@ class _InvenTreeBarcodeSettingsState extends State<InvenTreeBarcodeSettingsWidge
 
  int barcodeScanDelay = 500;
  int barcodeScanType = BARCODE_CONTROLLER_CAMERA;
+ bool barcodeScanSingle = false;
 
  final TextEditingController _barcodeScanDelayController = TextEditingController();
 
@@ -30,6 +31,7 @@ class _InvenTreeBarcodeSettingsState extends State<InvenTreeBarcodeSettingsWidge
   Future<void> loadSettings() async {
     barcodeScanDelay = await InvenTreeSettingsManager().getValue(INV_BARCODE_SCAN_DELAY, 500) as int;
     barcodeScanType = await InvenTreeSettingsManager().getValue(INV_BARCODE_SCAN_TYPE, BARCODE_CONTROLLER_CAMERA) as int;
+    barcodeScanSingle = await InvenTreeSettingsManager().getBool(INV_BARCODE_SCAN_SINGLE, false);
 
     if (mounted) {
       setState(() {
@@ -153,6 +155,20 @@ class _InvenTreeBarcodeSettingsState extends State<InvenTreeBarcodeSettingsWidge
                 },
               ),
             ),
+            ListTile(
+              title: Text(L10().barcodeScanSingle),
+              subtitle: Text(L10().barcodeScanSingleDetail),
+              leading: Icon(Icons.barcode_reader),
+              trailing: Switch(
+                value: barcodeScanSingle,
+                onChanged: (bool v) {
+                  InvenTreeSettingsManager().setValue(INV_BARCODE_SCAN_SINGLE, v);
+                  setState(() {
+                    barcodeScanSingle = v;
+                  });
+                },
+              ),
+            )
           ],
         )
       )

pubspec.yaml

@@ -1,7 +1,7 @@
 name: inventree
 description: InvenTree stock management
 
-version: 0.13.0+76
+version: 0.14.0+77
 
 environment:
   sdk: ">=2.19.5 <3.13.0"