Reader Widget's Crop Indicator doesn't show actual cropped area

[HeftyCoder]

If the Reader Widget is placed inside another Widget and is not full screen, the indicator doesn't show the correct area to be cropped.

To recreate, put the Reader Widget between two other widgets (e.g. using Scaffold and a navigator). The result is that the area being shown isn't the actual area of the image being cropped (i.e. you won't get a good scan if you try to center through the drawn square).

Additionally, could we perhaps show the detection graphic that multi-scan has on the single scan?

[khoren93]

@HeftyCoder Thanks for the report. In non‑fullscreen layouts the preview is letterboxed, so the overlay can misalign with the actual crop. As a workaround, keep the crop centered:

ReaderWidget(
  verticalCropOffset: 0,
  horizontalCropOffset: 0,
)

I also added detection coordinates overlay for single-scan. To show it, set no cropping:

ReaderWidget(
  cropPercent: 0, // show detection graphic in single-scan
)

[JonasHeisterkamp]

I'm having a problem regarding the cropped indicator: my ReaderWidget is placed inside a SizedBox and the overlay for cropping isn't placed at the center of the ReaderWidget (default values for cropPercent and cropOffset).