Capture the current page's width in page change evt ?

[gn00979905]

Hi everyone, I would like to know how to capture the current page's width in page change event?
For some page will be very big size of paper, I need to detect it.
Thank you very much!

[gn00979905]

I figured out. In 'page change' event:
var pageview=PDFViewerApplication.pdfviewer.getPageView(evt.pageNumber-1).pdfPage.getViewport(1);
var pagewidth = pageview.width;