Merge pull request #1272 from navaronbracke/placeholder_child

fix: remove unused child argument

Author: navaronbracke

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 * The `updateScanWindow` method is now private. Instead, update the scan window in the `MobileScanner` widget directly.
 * The deprecated `EncryptionType.none` constant has been removed. Use `EncryptionType.unknown` instead.
+* The `errorBuilder` and `placeholderBuilder` of the `MobileScanner` widget no longer take a Widget argument, as it was unused.
+* The `MobileScannerErrorBuilder` typedef has been removed.
 
 Bugs fixed:
 * [Apple] Fixed an issue which caused the scanWindow to always be present, even when reset to no value.

example/lib/barcode_scanner_controller.dart

@@ -55,7 +55,7 @@ class _BarcodeScannerWithControllerState
         children: [
           MobileScanner(
             controller: controller,
-            errorBuilder: (context, error, child) {
+            errorBuilder: (context, error) {
               return ScannerErrorWidget(error: error);
             },
             fit: BoxFit.contain,
@@ -65,7 +65,7 @@ class _BarcodeScannerWithControllerState
             child: Container(
               alignment: Alignment.bottomCenter,
               height: 100,
-              color: Colors.black.withOpacity(0.4),
+              color: const Color.fromRGBO(0, 0, 0, 0.4),
               child: Row(
                 mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                 children: [

example/lib/barcode_scanner_pageview.dart

@@ -69,7 +69,7 @@ class _BarcodeScannerPage extends StatelessWidget {
         MobileScanner(
           controller: controller,
           fit: BoxFit.contain,
-          errorBuilder: (context, error, child) {
+          errorBuilder: (context, error) {
             return ScannerErrorWidget(error: error);
           },
         ),
@@ -78,7 +78,7 @@ class _BarcodeScannerPage extends StatelessWidget {
           child: Container(
             alignment: Alignment.bottomCenter,
             height: 100,
-            color: Colors.black.withOpacity(0.4),
+            color: const Color.fromRGBO(0, 0, 0, 0.4),
             child: Center(
               child: ScannedBarcodeLabel(barcodes: controller.barcodes),
             ),

example/lib/barcode_scanner_returning_image.dart

@@ -87,7 +87,7 @@ class _BarcodeScannerReturningImageState
                   children: [
                     MobileScanner(
                       controller: controller,
-                      errorBuilder: (context, error, child) {
+                      errorBuilder: (context, error) {
                         return ScannerErrorWidget(error: error);
                       },
                       fit: BoxFit.contain,
@@ -97,7 +97,7 @@ class _BarcodeScannerReturningImageState
                       child: Container(
                         alignment: Alignment.bottomCenter,
                         height: 100,
-                        color: Colors.black.withOpacity(0.4),
+                        color: const Color.fromRGBO(0, 0, 0, 0.4),
                         child: Row(
                           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                           children: [

example/lib/barcode_scanner_simple.dart

@@ -50,7 +50,7 @@ class _BarcodeScannerSimpleState extends State<BarcodeScannerSimple> {
             child: Container(
               alignment: Alignment.bottomCenter,
               height: 100,
-              color: Colors.black.withOpacity(0.4),
+              color: const Color.fromRGBO(0, 0, 0, 0.4),
               child: Row(
                 mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                 children: [

example/lib/barcode_scanner_window.dart

@@ -39,7 +39,7 @@ class _BarcodeScannerWithScanWindowState
             fit: boxFit,
             scanWindow: scanWindow,
             controller: controller,
-            errorBuilder: (context, error, child) {
+            errorBuilder: (context, error) {
               return ScannerErrorWidget(error: error);
             },
           ),
@@ -54,7 +54,7 @@ class _BarcodeScannerWithScanWindowState
               alignment: Alignment.center,
               padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
               height: 100,
-              color: Colors.black.withOpacity(0.4),
+              color: const Color.fromRGBO(0, 0, 0, 0.4),
               child: ScannedBarcodeLabel(barcodes: controller.barcodes),
             ),
           ),

example/lib/barcode_scanner_zoom.dart

@@ -77,7 +77,7 @@ class _BarcodeScannerWithZoomState extends State<BarcodeScannerWithZoom> {
           MobileScanner(
             controller: controller,
             fit: BoxFit.contain,
-            errorBuilder: (context, error, child) {
+            errorBuilder: (context, error) {
               return ScannerErrorWidget(error: error);
             },
           ),
@@ -86,7 +86,7 @@ class _BarcodeScannerWithZoomState extends State<BarcodeScannerWithZoom> {
             child: Container(
               alignment: Alignment.bottomCenter,
               height: 100,
-              color: Colors.black.withOpacity(0.4),
+              color: const Color.fromRGBO(0, 0, 0, 0.4),
               child: Column(
                 children: [
                   if (!kIsWeb) _buildZoomScaleSlider(),

example/lib/mobile_scanner_overlay.dart

@@ -38,7 +38,7 @@ class _BarcodeScannerWithOverlayState extends State<BarcodeScannerWithOverlay> {
               fit: BoxFit.contain,
               controller: controller,
               scanWindow: scanWindow,
-              errorBuilder: (context, error, child) {
+              errorBuilder: (context, error) {
                 return ScannerErrorWidget(error: error);
               },
               overlayBuilder: (context, constraints) {

example/lib/scanner_error_widget.dart

@@ -19,7 +19,6 @@ class ScannerErrorWidget extends StatelessWidget {
         errorMessage = 'Scanning is unsupported on this device';
       default:
         errorMessage = 'Generic Error';
-        break;
     }
 
     return ColoredBox(

lib/src/mobile_scanner.dart

@@ -8,13 +8,6 @@ import 'package:mobile_scanner/src/objects/barcode_capture.dart';
 import 'package:mobile_scanner/src/objects/mobile_scanner_state.dart';
 import 'package:mobile_scanner/src/scan_window_calculation.dart';
 
-/// The function signature for the error builder.
-typedef MobileScannerErrorBuilder = Widget Function(
-  BuildContext,
-  MobileScannerException,
-  Widget?,
-);
-
 /// This widget displays a live camera preview for the barcode scanner.
 class MobileScanner extends StatefulWidget {
   /// Create a new [MobileScanner] using the provided [controller].
@@ -50,7 +43,7 @@ class MobileScanner extends StatefulWidget {
   ///
   /// If this is null, a black [ColoredBox],
   /// with a centered white [Icons.error] icon is used as error widget.
-  final MobileScannerErrorBuilder? errorBuilder;
+  final Widget Function(BuildContext, MobileScannerException)? errorBuilder;
 
   /// The [BoxFit] for the camera preview.
   ///
@@ -73,7 +66,7 @@ class MobileScanner extends StatefulWidget {
   /// If this is null, a black [ColoredBox] is used as placeholder.
   ///
   /// The placeholder is displayed when the camera preview is being initialized.
-  final Widget Function(BuildContext, Widget?)? placeholderBuilder;
+  final WidgetBuilder? placeholderBuilder;
 
   /// The scan window rectangle for the barcode scanner.
   ///
@@ -203,12 +196,11 @@ class _MobileScannerState extends State<MobileScanner>
   Widget build(BuildContext context) {
     return ValueListenableBuilder<MobileScannerState>(
       valueListenable: controller,
-      builder: (BuildContext context, MobileScannerState value, Widget? child) {
+      builder: (BuildContext context, MobileScannerState value, _) {
         if (!value.isInitialized) {
           const Widget defaultPlaceholder = ColoredBox(color: Colors.black);
 
-          return widget.placeholderBuilder?.call(context, child) ??
-              defaultPlaceholder;
+          return widget.placeholderBuilder?.call(context) ?? defaultPlaceholder;
         }
 
         final MobileScannerException? error = value.error;
@@ -219,8 +211,7 @@ class _MobileScannerState extends State<MobileScanner>
             child: Center(child: Icon(Icons.error, color: Colors.white)),
           );
 
-          return widget.errorBuilder?.call(context, error, child) ??
-              defaultError;
+          return widget.errorBuilder?.call(context, error) ?? defaultError;
         }
 
         return LayoutBuilder(