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pagination.py
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Mon, Jul 8, 07:41

pagination.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2013 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
Invenio pagination helper class.
"""
from math import ceil
class Pagination(object):
"""Helps with rendering pagination list."""
def __init__(self, page, per_page, total_count):
self.page = page
self.per_page = per_page
self.total_count = total_count
@property
def pages(self):
"""Returns number of pages."""
return int(ceil(self.total_count / float(self.per_page)))
@property
def has_prev(self):
"""Returns true if it has previous page."""
return self.page > 1
@property
def has_next(self):
"""Returns true if it has next page."""
return self.page < self.pages
def iter_pages(self, left_edge=1, left_current=1,
right_current=3, right_edge=1):
last = 0
for num in xrange(1, self.pages + 1):
if num <= left_edge or \
(num > self.page - left_current - 1 and
num < self.page + right_current) or \
num > self.pages - right_edge:
if last + 1 != num:
yield None
yield num
last = num

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