Features/Evince Introspection Bindings

Summary

The pygtk bindings used until F14 to use the evince backend in Read activity, are no longer present in F16. We need use the new gi based bindings

Owner

• Gonzalo Odiard

Current status

• Targeted release: 0.96
• Last updated: 31 Jan 2012
• Percentage of completion: 90%

Initial information

• This feature depends on evince 3.4 (shipped in F17)

• The bindings are already fixed and packaged in Fedora Rawhide

Implementation plan

The first step is port this simple demo to gtk3:

e = evince.View()
docmodel = evince.DocumentModel()
doc = evince.document_factory_get_document('file:///path/to/file/example.pdf')
docmodel.set_document(doc)
e.set_model(model)

With gtk 3 is:

from gi.repository import Gtk, Gio
from gi.repository import EvinceDocument
from gi.repository import EvinceView

class HelloWorldApp(Gtk.Application):
   def __init__(self):
       Gtk.Application.__init__(self, application_id="apps.test.helloevince",
                                flags=Gio.ApplicationFlags.FLAGS_NONE)
       self.connect("activate", self.on_activate)
       
   def on_activate(self, data=None):
       window = Gtk.Window(type=Gtk.WindowType.TOPLEVEL)
       window.set_title("Evince Gtk3 Python Example")
       window.set_border_width(24)

       scroll = Gtk.ScrolledWindow()
       window.add(scroll)

       EvinceDocument.init()
       doc = EvinceDocument.Document.factory_get_document('file:///home/gonzalo/Desktop/AjedrezyLeyendas-Postmortem.pdf')
       view = EvinceView.View()
       model = EvinceView.DocumentModel()
       model.set_document(doc)
       view.set_model(model)
       scroll.add(view)

       window.show_all()
       self.add_window(window)
   
if __name__ == "__main__":
   app = HelloWorldApp()
   app.run(None)

More information

Not directly related. Evince developers have a request to support epub format [1].

We are implementing our own epub reader displaying it with webkit. If implemented in evince, we can simplify our code a lot.

Benefit to Sugar

What is the benefit to the platform? If this is a major capability update, what has changed? If this is a new feature, what capabilities does it bring? Why will Sugar become a better platform or project because of this feature?

Make sure to note here as well if this feature has been requested by a specific deployment, or if it has emerged from a bug report.

Scope

What work do the developers have to accomplish to complete the feature in time for release? Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?

UI Design

Does the feature have a direct impact on the work flow, or does it need a UI? Link here mockups, or add detailed descriptions.

User Experience

If this feature is noticeable by its target audience, how will their experiences change as a result? Describe what they will see or notice.

Contingency Plan

If you cannot complete your feature by the final development freeze, what is the backup plan? This might be as simple as "None necessary, revert to previous release behaviour." Or it might not. If your feature is not completed in time, we want to assure others that other parts of Sugar will not be in jeopardy.

Documentation

Is there upstream documentation on this feature, or notes you have written yourself? Has this topic been discussed in the mailing list or during a meeting? Link to that material here so other interested developers can get involved.

Release Notes

The Sugar Release Notes inform end-users about what is new in the release. An Example is 0.84/Notes. The release notes also help users know how to deal with platform changes such as ABIs/APIs, configuration or data file formats, or upgrade concerns. If there are any such changes involved in this feature, indicate them here. You can also link to upstream documentation if it satisfies this need. This information forms the basis of the release notes edited by the release team and shipped with the release.

Comments and Discussion

• See discussion tab for this feature