ubuntu-touch-coreapps team mailing list archive

[Stefano Verzegnassi <stefano92.100@xxxxxxxxx>]

Hi everybody,

I totally missed this project for a long time, but now that there's a 
renewed interest it would be nice to complete this app in time for the 
official release of Ubuntu (Touch).

I recently took some time on its code, and I found some parts in the PDF 
viewer that could be improved as well. Before proposing an MP, I'd like 
to discuss about this.

1) The current revision of the code loads all the PDF pages at the 
start-up: with a large PDF file, it results somehow slow and takes much 
RAM to store pages.

I've tried to use a QML ListView with the cacheBuffer property set to 0, 
so pages are loaded only when requested.

2) I've made some modification to Poppler QML Plugin[1], adding a 
QAbstractListModel and exposing the size of each PDF page.

By doing this, it becomes possible to predict the size of the ListView 
delegate, even when the PDF page image is not loaded yet from the Image 
Provider.

3) I've also tried to expose some relevant information from the PDF 
Document[2], that could be useful when filling the details page.

4) At the time it could be of help to have poppler-qml-plugin in the 
app's source tree too, so the development of both backend and frontend 
will be more "synergistic". (I'm refering to the latest thread on 
docviewer[3] - I'm writing this here because I don't get email 
notification for that thread, since I joined the mailing-list later).

If it can help somehow the project workflow, it would be a pleasure for 
me to join the Document Viewer team.

Thanks in advice,
Stefano


[1]: https://launchpad.net/poppler-qml-plugin
[2]: 
http://people.freedesktop.org/~aacid/docs/qt5/classPoppler_1_1Document.html#a00c581e1103955cc3cf00908fac5ce53
[3]: https://lists.launchpad.net/ubuntu-touch-coreapps/msg00798.html