[Feature request] onScaleChanged callback

[ljukas]

Great library! Really like the "simple" approach to pdf rendering.

Id like put in an idea for a feature. Which is a callback for when the scale factor of the pdf changes.

Usages would be to darken area around the pdf on zoom for example to highlight the pdf as the focus of the screen.

[douglasjunior]

Hi @ljukas thank you for the suggestion, I think his is simple to add.

PRs are welcome.

Sorry for the delay, I completely missed this notification.