onViewFinderTap method
Implementation
void onViewFinderTap(TapDownDetails details, BoxConstraints constraints) {
if (widget.photoController == null) {
return;
}
final CameraController cameraController = widget.photoController!;
final Offset offset = Offset(
details.localPosition.dx / constraints.maxWidth,
details.localPosition.dy / constraints.maxHeight,
);
cameraController.setExposurePoint(offset);
cameraController.setFocusPoint(offset);
}