id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,distribution,status_field
3413,Read: number of pages in epub books can change,godiard,godiard,"The epub files do not have information aboout pages, because the information is stored in files by chapters, and as a continuum html text. 

The epub backend in the Read activity use a webkit widget to load the html file, and execute a javascript to calulate the document height, and based on this value, calculate the number of pages. The problem we have is, running this javascript code return different values at times. We use this value to calculate the position needed to scroll to position the document when the activity start at the same position the reader left the last session. Also based inthe scroll position, we update the toolbar widget with the page number, and show the bookmarks related to the page.

I researched how other book readers calculate the pages, and there are not a uniform solution.

* readers using the Adobe code to display calculate the number of pages based in the size of the chapter file. [1] and [2]

* fbreader use the library ZLibrary to calculate the number of pages [3] but this number are not related with the size in the webview, then are not useful for us without change a lot our code.

* Other epub readers use css and javascript to paginate the text,
but this does not resolve for us how to update the information in our toolbar. [4] [5]

I have tried modifying the javascript code, but the returned values continue being different


[1] http://bookclubs.barnesandnoble.com/t5/NOOK-Book-Discussion/EPUBs-and-page-numbering/td-p/691602

[2] http://www.mobileread.com/forums/archive/index.php/t-166173.html

[3] http://stackoverflow.com/questions/6027477/how-the-fbreader-do-the-pagination-of-html-files-in-epub

[4] http://stackoverflow.com/questions/2808652/how-to-implement-page-break-in-epub-reader

[5] http://stackoverflow.com/questions/3636052/html-book-like-pagination?tab=active#tab-top",defect,closed,Unspecified by Maintainer,0.96,Read,Unspecified,Unspecified,fixed,"12.1.0, olpc-test-passed",,Unspecified,Unconfirmed