def number_of_file_previews(self):
"""The number of previews generated for a file."""
context = aq_inner(self.context)
if context.portal_type != 'File':
return
try:
docconv = IDocconv(self.context)
except TypeError: # TODO: prevent this form happening in tests
return
if docconv.has_previews():
return docconv.get_number_of_pages()
def get_docconv_thumbs_urls(self, attachment):
"""
If we have a IDocconv adapted object,
we ask docconv for thumbs urls
"""
docconv = IDocconv(attachment, None)
if not docconv:
return []
base_url = "%s/docconv_image_thumb.jpg?page=" % (docconv.context.absolute_url())
pages = docconv.get_number_of_pages()
if pages <= 0: # we have no previews when pages is 0 or -1
return []
else:
return [(base_url + str(i + 1)) for i in range(pages)]
