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@ -4,8 +4,10 @@ import 'dart:math';
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import 'package:camera/camera.dart'; |
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import 'package:flutter/material.dart'; |
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import 'package:image_picker/image_picker.dart'; |
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import '../../flutter_zxing.dart'; |
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import 'scan_mode_dropdown.dart'; |
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/// Widget to scan a code from the camera stream |
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class ReaderWidget extends StatefulWidget { |
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@ -16,13 +18,18 @@ class ReaderWidget extends StatefulWidget {
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this.onMultiScan, |
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this.onMultiScanFailure, |
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this.onControllerCreated, |
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this.onMultiScanModeChanged, |
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this.isMultiScan = false, |
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this.codeFormat = Format.any, |
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this.tryHarder = false, |
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this.tryInverted = false, |
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this.showScannerOverlay = true, |
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this.scannerOverlay, |
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this.actionButtonsAlignment = Alignment.topCenter, |
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this.actionButtonsPadding = const EdgeInsets.all(10), |
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this.showFlashlight = true, |
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this.showToggleCamera = true, |
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this.showGallery = true, |
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this.allowPinchZoom = true, |
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this.scanDelay = const Duration(milliseconds: 1000), |
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this.scanDelaySuccess = const Duration(milliseconds: 1000), |
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@ -47,6 +54,9 @@ class ReaderWidget extends StatefulWidget {
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/// Called when the camera controller is created |
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final Function(CameraController?)? onControllerCreated; |
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/// Called when the multi scan mode is changed |
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final Function(bool)? onMultiScanModeChanged; |
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/// Allow multiple scans |
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final bool isMultiScan; |
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@ -65,9 +75,21 @@ class ReaderWidget extends StatefulWidget {
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/// Custom scanner overlay |
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final ScannerOverlay? scannerOverlay; |
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/// Align for action buttons |
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final AlignmentGeometry actionButtonsAlignment; |
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/// Padding for action buttons |
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final EdgeInsetsGeometry actionButtonsPadding; |
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/// Show flashlight button |
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final bool showFlashlight; |
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/// Show toggle camera |
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final bool showGallery; |
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/// Show toggle camera |
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final bool showToggleCamera; |
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/// Allow pinch zoom |
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final bool allowPinchZoom; |
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@ -93,6 +115,7 @@ class ReaderWidget extends StatefulWidget {
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class _ReaderWidgetState extends State<ReaderWidget> |
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with TickerProviderStateMixin, WidgetsBindingObserver { |
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List<CameraDescription> cameras = <CameraDescription>[]; |
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CameraDescription? selectedCamera; |
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CameraController? controller; |
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bool _cameraOn = false; |
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@ -106,12 +129,15 @@ class _ReaderWidgetState extends State<ReaderWidget>
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// true when code detecting is ongoing |
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bool _isProcessing = false; |
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Codes results = Codes(<Code>[], 0); |
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bool isMultiScan = false; |
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Codes results = Codes(); |
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@override |
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void initState() { |
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super.initState(); |
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WidgetsBinding.instance.addObserver(this); |
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isMultiScan = widget.isMultiScan; |
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initStateAsync(); |
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} |
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@ -123,7 +149,8 @@ class _ReaderWidgetState extends State<ReaderWidget>
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setState(() { |
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this.cameras = cameras; |
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if (cameras.isNotEmpty) { |
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onNewCameraSelected(cameras.first); |
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selectedCamera = cameras.first; |
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onNewCameraSelected(selectedCamera); |
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} |
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}); |
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}); |
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@ -171,7 +198,10 @@ class _ReaderWidgetState extends State<ReaderWidget>
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} |
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} |
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Future<void> onNewCameraSelected(CameraDescription cameraDescription) async { |
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Future<void> onNewCameraSelected(CameraDescription? cameraDescription) async { |
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if (cameraDescription == null) { |
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return; |
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} |
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final CameraController? oldController = controller; |
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if (oldController != null) { |
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// controller?.removeListener(rebuildOnMount); |
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@ -235,7 +265,7 @@ class _ReaderWidgetState extends State<ReaderWidget>
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await Future<void>.delayed(widget.scanDelaySuccess); |
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} |
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} else { |
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results = Codes(<Code>[], 0); |
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results = Codes(); |
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widget.onMultiScanFailure?.call(result); |
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} |
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} else { |
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@ -327,12 +357,58 @@ class _ReaderWidgetState extends State<ReaderWidget>
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controller?.setZoomLevel(_scaleFactor); |
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}, |
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), |
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Align( |
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alignment: widget.actionButtonsAlignment, |
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child: Padding( |
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padding: widget.actionButtonsPadding, |
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child: ClipRRect( |
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borderRadius: BorderRadius.circular(10), |
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child: Container( |
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color: Colors.black.withOpacity(0.5), |
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child: Row( |
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mainAxisSize: MainAxisSize.min, |
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children: <Widget>[ |
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if (widget.showFlashlight && isCameraReady) |
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Positioned( |
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bottom: 20, |
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left: 20, |
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child: FloatingActionButton( |
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onPressed: () { |
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IconButton( |
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onPressed: _onFlashButtonTapped, |
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color: Colors.white, |
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icon: Icon( |
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_flashIcon( |
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controller?.value.flashMode ?? FlashMode.off), |
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), |
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), |
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if (widget.showGallery && isCameraReady) |
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IconButton( |
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onPressed: _onGalleryButtonTapped, |
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color: Colors.white, |
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icon: const Icon(Icons.photo_library), |
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), |
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if (widget.showToggleCamera && isCameraReady) |
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IconButton( |
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onPressed: _onCameraButtonTapped, |
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color: Colors.white, |
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icon: const Icon(Icons.switch_camera), |
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), |
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], |
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), |
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), |
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), |
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), |
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), |
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ScanModeDropdown( |
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isMultiScan: isMultiScan, |
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onChanged: (bool value) { |
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setState(() { |
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isMultiScan = value; |
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}); |
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widget.onMultiScanModeChanged?.call(value); |
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}, |
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), |
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], |
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); |
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} |
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void _onFlashButtonTapped() { |
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FlashMode mode = controller!.value.flashMode; |
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if (mode == FlashMode.torch) { |
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mode = FlashMode.off; |
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@ -341,31 +417,46 @@ class _ReaderWidgetState extends State<ReaderWidget>
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} |
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controller?.setFlashMode(mode); |
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setState(() {}); |
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}, |
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backgroundColor: Colors.black26, |
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child: _FlashIcon( |
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flashMode: controller?.value.flashMode ?? FlashMode.off)), |
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} |
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Future<void> _onGalleryButtonTapped() async { |
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final XFile? file = |
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await ImagePicker().pickImage(source: ImageSource.gallery); |
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if (file != null) { |
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final Code result = await zx.readBarcodeImagePath( |
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file, |
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params: DecodeParams( |
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format: widget.codeFormat, |
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tryHarder: widget.tryHarder, |
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tryInverted: widget.tryInverted, |
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isMultiScan: widget.isMultiScan, |
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), |
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], |
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); |
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if (result.isValid) { |
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widget.onScan?.call(result); |
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} else { |
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widget.onScanFailure?.call(result); |
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} |
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} |
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} |
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class _FlashIcon extends StatelessWidget { |
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const _FlashIcon({required this.flashMode}); |
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final FlashMode flashMode; |
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void _onCameraButtonTapped() { |
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final int cameraIndex = cameras.indexOf(controller!.description); |
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final int nextCameraIndex = (cameraIndex + 1) % cameras.length; |
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selectedCamera = cameras[nextCameraIndex]; |
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onNewCameraSelected(selectedCamera); |
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} |
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@override |
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Widget build(BuildContext context) { |
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switch (flashMode) { |
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IconData _flashIcon(FlashMode mode) { |
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switch (mode) { |
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case FlashMode.torch: |
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return const Icon(Icons.flash_on); |
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return Icons.flash_on; |
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case FlashMode.off: |
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return const Icon(Icons.flash_off); |
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return Icons.flash_off; |
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case FlashMode.always: |
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return const Icon(Icons.flash_on); |
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return Icons.flash_on; |
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case FlashMode.auto: |
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return const Icon(Icons.flash_auto); |
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return Icons.flash_auto; |
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} |
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} |
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} |
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Khoren Markosyan
2 years ago