Controller for custom logics?

[lzzy12]

Hi, my use-case requires to get the page number the user currently is on and the total number of pages. Is this possible to get with the EpubScreen.fromFile constructor or is there any other way to do this? I am looking for something like a controller class for the reader.

[jmgeffroy]

Hi @lzzy12, In fact, the ReaderContext does provide a currentLocationStream, which seems to be what you need if I understand correctly. To see an example in action, you can have a look at this code in the ReaderToolbar class. If access to this stream is what you ned, I'll think about a clean way to provide access to it.

[lzzy12]

Yes it will be helpful if this could be available through an API outside the package.

[jmgeffroy]

@lzzy12 I have added a paginationCallback parameter to the EpubScreen API, and adapted the reader widget example to showcase it:

        EpubScreen.fromPath(
          filePath: widget.dirPath,
          location: '{"cfi":" ","idref":"file_12.html"}',
          paginationCallback: (paginationInfo) {
            Fimber.d("--- paginationInfo: $paginationInfo");
          },
        )

The PaginationInfo class contains a lot of information about the position.

Does it match your requirements ?

[lzzy12]

Hi, thanks for your quick responses. While this does give me the current page number, I could not figure out which one of the attributes stores the total number of pages in the epub file. Could you please point me to it?

[jmgeffroy]

Hello @lzzy12, in fact PaginationInfo contains a page method, which is defined as follows (pagination_info.dart):

  int get page =>
      linkPagination.firstPageNumber +
      percent * (linkPagination.pagesCount - 1) ~/ 100;

[lzzy12]

Hi @jmgeffroy Currently this page method just gives me the current page number user is on. How do I get the total number of pages present in the epub file?

[lzzy12]

Also the perccent seems to be giving wrong information. It seems inconsistent with what is currently on the UI

I get this when I log the percent field [log] percent: 23 [log] percent: 23

My code:

EpubScreen.fromPath(
                        filePath: controller.bookPath!,
                        paginationCallback: (data) {
                          controller.ePubPageCount.value =
                              data.linkPagination.pagesCount;
                          controller.ePubPage.value =
                              data.percent ~/ data.linkPagination.pagesCount;
                          log("percent: ${data.percent.toString()}");
                        },
                      )

[jmgeffroy]

Hi @lzzy12, That's a good point; thank you for your feedback. Based on your observations, I have to look into this more. Obviously, page counts in reflowable epubs are approximations, but not as bad as what you are experiencing. Today I'm busy, but I'll look at it asap.

[lzzy12]

Hi @jmgeffroy, did you get a chance to look at this issue?