Convert the document version list view to item view mode.

Add document version preview and thumbnail widgets.
Update the new version upload event have the version
as the target and the document as the action object.

Backported from the development branch.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/documents/views/document_version_views.py

@@ -7,8 +7,12 @@ from django.shortcuts import get_object_or_404
 from django.utils.translation import ugettext_lazy as _
 
 from acls.models import AccessControlList
-from common.generics import ConfirmView, SingleObjectListView
+from common.generics import (
+    ConfirmView, SingleObjectDetailView, SingleObjectListView
+)
 
+from ..events import event_document_view
+from ..forms import DocumentVersionPreviewForm
 from ..models import Document, DocumentVersion
 from ..permissions import (
     permission_document_download, permission_document_version_revert,
@@ -38,7 +42,8 @@ class DocumentVersionListView(SingleObjectListView):
 
     def get_extra_context(self):
         return {
-            'hide_object': True, 'object': self.get_document(),
+            'list_as_items': True,
+            'object': self.get_document(),
             'title': _('Versions of document: %s') % self.get_document(),
         }
 
@@ -96,3 +101,29 @@ class DocumentVersionDownloadFormView(DocumentDownloadFormView):
 class DocumentVersionDownloadView(DocumentDownloadView):
     model = DocumentVersion
     object_permission = permission_document_download
+
+
+class DocumentVersionView(SingleObjectDetailView):
+    form_class = DocumentVersionPreviewForm
+    model = DocumentVersion
+    object_permission = permission_document_version_view
+
+    def dispatch(self, request, *args, **kwargs):
+        result = super(
+            DocumentVersionView, self
+        ).dispatch(request, *args, **kwargs)
+        self.get_object().document.add_as_recent_document_for_user(
+            request.user
+        )
+        event_document_view.commit(
+            actor=request.user, target=self.get_object().document
+        )
+
+        return result
+
+    def get_extra_context(self):
+        return {
+            'hide_labels': True,
+            'object': self.get_object(),
+            'title': _('Preview of document version: %s') % self.get_object(),
+        }