v5.0.0-beta.1

BREAKING CHANGES:

• The width and height of BarcodeCapture have been removed, in favor of size.
• The raw attribute is now Object? instead of dynamic, so that it participates in type promotion.
• The MobileScannerArguments class has been removed from the public API, as it is an internal type.
• The cameraFacingOverride named argument for the start() method has been renamed to cameraDirection.
• The analyzeImage function now correctly returns a BarcodeCapture? instead of a boolean.
• The formats attribute of the MobileScannerController is now non-null.
• The MobileScannerState enum has been renamed to MobileScannerAuthorizationState.
• The various ValueNotifiers for the camera state have been removed. Use the value of the MobileScannerController instead.
• The hasTorch getter has been removed. Instead, use the torch state of the controller's value.
  The TorchState enum now provides a new value for unavailable flashlights.
• The autoStart attribute has been removed from the MobileScannerController. The controller should be manually started on-demand.
• A controller is now required for the MobileScanner widget.
• The onPermissionSet, onStart and onScannerStarted methods have been removed from the MobileScanner widget. Instead, await MobileScannerController.start().
• The startDelay has been removed from the MobileScanner widget. Instead, use a delay between manual starts of one or more controllers.
• The onDetect method has been removed from the MobileScanner widget. Instead, listen to MobileScannerController.barcodes directly.
• The overlay widget of the MobileScanner has been replaced by a new property, overlayBuilder, which provides the constraints for the overlay.
• The torch can no longer be toggled on the web, as this is only available for image tracks and not video tracks. As a result the torch state for the web will always be TorchState.unavailable.
• The zoom scale can no longer be modified on the web, as this is only available for image tracks and not video tracks. As a result, the zoom scale will always be 1.0.

Improvements:

• The MobileScannerController is now a ChangeNotifier, with MobileScannerState as its model.
• The web implementation now supports alternate URLs for loading the barcode library.