Called when a new estimate for the import/export rect has been generated. This can be called multiple times.
Only the last call to this listener must be accurate.
The import/export rect is also returned by [start].
Note: In a future release, the options parameter may be required.
Called when a new estimate for the import/export rect has been generated. This can be called multiple times. Only the last call to this listener must be accurate. The import/export rect is also returned by [start].
Note: In a future release, the
optionsparameter may be required.