+++ /dev/null
-try:
- set
-except NameError:
- from sets import Set as set
-from django import template
-from django.db.models.query import QuerySet
-from django.core.paginator import Paginator, QuerySetPaginator, InvalidPage
-
-register = template.Library()
-
-DEFAULT_PAGINATION = 20
-DEFAULT_WINDOW = 4
-DEFAULT_ORPHANS = 0
-
-def do_autopaginate(parser, token):
- """
- Splits the arguments to the autopaginate tag and formats them correctly.
- """
- split = token.split_contents()
- if len(split) == 2:
- return AutoPaginateNode(split[1])
- elif len(split) == 3:
- try:
- paginate_by = int(split[2])
- except ValueError:
- raise template.TemplateSyntaxError(u'Got %s, but expected integer.' % split[2])
- return AutoPaginateNode(split[1], paginate_by=paginate_by)
- elif len(split) == 4:
- try:
- paginate_by = int(split[2])
- except ValueError:
- raise template.TemplateSyntaxError(u'Got %s, but expected integer.' % split[2])
- try:
- orphans = int(split[3])
- except ValueError:
- raise template.TemplateSyntaxError(u'Got %s, but expected integer.' % split[3])
- return AutoPaginateNode(split[1], paginate_by=paginate_by, orphans=orphans)
- else:
- raise template.TemplateSyntaxError('%r tag takes one required argument and one optional argument' % split[0])
-
-class AutoPaginateNode(template.Node):
- """
- Emits the required objects to allow for Digg-style pagination.
-
- First, it looks in the current context for the variable specified. This
- should be either a QuerySet or a list.
-
- 1. If it is a QuerySet, this ``AutoPaginateNode`` will emit a
- ``QuerySetPaginator`` and the current page object into the context names
- ``paginator`` and ``page_obj``, respectively.
-
- 2. If it is a list, this ``AutoPaginateNode`` will emit a simple
- ``Paginator`` and the current page object into the context names
- ``paginator`` and ``page_obj``, respectively.
-
- It will then replace the variable specified with only the objects for the
- current page.
-
- .. note::
-
- It is recommended to use *{% paginate %}* after using the autopaginate
- tag. If you choose not to use *{% paginate %}*, make sure to display the
- list of availabale pages, or else the application may seem to be buggy.
- """
- def __init__(self, queryset_var, paginate_by=DEFAULT_PAGINATION, orphans=DEFAULT_ORPHANS):
- self.queryset_var = template.Variable(queryset_var)
- self.paginate_by = paginate_by
- self.orphans = orphans
-
- def render(self, context):
- key = self.queryset_var.var
- value = self.queryset_var.resolve(context)
- if issubclass(value.__class__, QuerySet):
- model = value.model
- paginator_class = QuerySetPaginator
- else:
- value = list(value)
- try:
- model = value[0].__class__
- except IndexError:
- return u''
- paginator_class = Paginator
- paginator = paginator_class(value, self.paginate_by, self.orphans)
- try:
- page_obj = paginator.page(context['request'].page)
- except InvalidPage:
- # context[key] = []
- # context['invalid_page'] = True
- # return u''
- from django.http import Http404
- raise Http404
- context[key] = page_obj.object_list
- context['paginator'] = paginator
- context['page_obj'] = page_obj
- return u''
-
-def paginate(context, window=DEFAULT_WINDOW):
- """
- Renders the ``pagination/pagination.html`` template, resulting in a
- Digg-like display of the available pages, given the current page. If there
- are too many pages to be displayed before and after the current page, then
- elipses will be used to indicate the undisplayed gap between page numbers.
-
- Requires one argument, ``context``, which should be a dictionary-like data
- structure and must contain the following keys:
-
- ``paginator``
- A ``Paginator`` or ``QuerySetPaginator`` object.
-
- ``page_obj``
- This should be the result of calling the page method on the
- aforementioned ``Paginator`` or ``QuerySetPaginator`` object, given
- the current page.
-
- This same ``context`` dictionary-like data structure may also include:
-
- ``getvars``
- A dictionary of all of the **GET** parameters in the current request.
- This is useful to maintain certain types of state, even when requesting
- a different page.
- """
- try:
- paginator = context['paginator']
- page_obj = context['page_obj']
- page_range = paginator.page_range
- # First and last are simply the first *n* pages and the last *n* pages,
- # where *n* is the current window size.
- first = set(page_range[:window])
- last = set(page_range[-window:])
- # Now we look around our current page, making sure that we don't wrap
- # around.
- current_start = page_obj.number-1-window
- if current_start < 0:
- current_start = 0
- current_end = page_obj.number-1+window
- if current_end < 0:
- current_end = 0
- current = set(page_range[current_start:current_end])
- pages = []
- # If there's no overlap between the first set of pages and the current
- # set of pages, then there's a possible need for elusion.
- if len(first.intersection(current)) == 0:
- first_list = sorted(list(first))
- second_list = sorted(list(current))
- pages.extend(first_list)
- diff = second_list[0] - first_list[-1]
- # If there is a gap of two, between the last page of the first
- # set and the first page of the current set, then we're missing a
- # page.
- if diff == 2:
- pages.append(second_list[0] - 1)
- # If the difference is just one, then there's nothing to be done,
- # as the pages need no elusion and are correct.
- elif diff == 1:
- pass
- # Otherwise, there's a bigger gap which needs to be signaled for
- # elusion, by pushing a None value to the page list.
- else:
- pages.append(None)
- pages.extend(second_list)
- else:
- pages.extend(sorted(list(first.union(current))))
- # If there's no overlap between the current set of pages and the last
- # set of pages, then there's a possible need for elusion.
- if len(current.intersection(last)) == 0:
- second_list = sorted(list(last))
- diff = second_list[0] - pages[-1]
- # If there is a gap of two, between the last page of the current
- # set and the first page of the last set, then we're missing a
- # page.
- if diff == 2:
- pages.append(second_list[0] - 1)
- # If the difference is just one, then there's nothing to be done,
- # as the pages need no elusion and are correct.
- elif diff == 1:
- pass
- # Otherwise, there's a bigger gap which needs to be signaled for
- # elusion, by pushing a None value to the page list.
- else:
- pages.append(None)
- pages.extend(second_list)
- else:
- pages.extend(sorted(list(last.difference(current))))
- to_return = {
- 'pages': pages,
- 'page_obj': page_obj,
- 'paginator': paginator,
- 'is_paginated': paginator.count > paginator.per_page,
- }
- if 'request' in context:
- getvars = context['request'].GET.copy()
- if 'page' in getvars:
- del getvars['page']
- if len(getvars.keys()) > 0:
- to_return['getvars'] = "&%s" % getvars.urlencode()
- else:
- to_return['getvars'] = ''
- return to_return
- except KeyError:
- return {}
-register.inclusion_tag('pagination/pagination.html', takes_context=True)(paginate)
-register.tag('autopaginate', do_autopaginate)
\ No newline at end of file
fnp / wolnelektury.git / blobdiff