zoom
The content's current zoom as a fraction of its min and max allowed zoom factors.
Return
A value between 0 and 1, where 0 indicates that the content is fully zoomed out, 1 indicates that the content is fully zoomed in, and null indicates that an initial zoom value hasn't been calculated yet and the content is hidden. A null value could be safely treated the same as 0, but Modifier.zoomable leaves that decision up to you.