except NameError:
from sets import Set as set
-def paginate(context, window=4):
- paginator = context['paginator']
- page_obj = context['page_obj']
- page_range = paginator.page_range
- first = set(page_range[:window])
- last_start = len(page_range)-window
- if last_start < 0:
- last_start = 0
- last = set(page_range[last_start:])
- current_start = page_obj.number-1-window
- if current_start < 0:
- current_start = 0
- current = set(page_range[current_start:page_obj.number-1+window])
- pages = []
- if len(first.intersection(current)) == 0:
- pages.extend(list(first))
- pages.append(None)
- pages.extend(list(current))
- else:
- pages.extend(first.union(current))
- if len(current.intersection(last)) == 0:
- pages.append(None)
- pages.extend(list(last))
- else:
- pages.extend(list(last.difference(current)))
- return {
- 'pages': pages,
- 'page_obj': page_obj,
- 'paginator': paginator,
- }
\ No newline at end of file
+from django import template
+from django.http import Http404
+from django.core.paginator import Paginator, InvalidPage
+from django.conf import settings
+
+register = template.Library()
+
+DEFAULT_PAGINATION = getattr(settings, 'PAGINATION_DEFAULT_PAGINATION', 20)
+DEFAULT_WINDOW = getattr(settings, 'PAGINATION_DEFAULT_WINDOW', 4)
+DEFAULT_ORPHANS = getattr(settings, 'PAGINATION_DEFAULT_ORPHANS', 0)
+INVALID_PAGE_RAISES_404 = getattr(settings,
+ 'PAGINATION_INVALID_PAGE_RAISES_404', False)
+
+def do_autopaginate(parser, token):
+ """
+ Splits the arguments to the autopaginate tag and formats them correctly.
+
+ Syntax is:
+
+ autopaginate SOMETHING [PAGINATE_BY] [ORPHANS] [as NAME]
+ """
+ i = iter(token.split_contents())
+ paginate_by = None
+ queryset_var = None
+ context_var = None
+ orphans = None
+ word = None
+ try:
+ word = i.next()
+ assert word == "autopaginate"
+ queryset_var = i.next()
+ word = i.next()
+ if word != "as":
+ paginate_by = word
+ try:
+ paginate_by = int(paginate_by)
+ except ValueError:
+ pass
+ word = i.next()
+ if word != "as":
+ orphans = word
+ try:
+ orphans = int(orphans)
+ except ValueError:
+ pass
+ word = i.next()
+ assert word == "as"
+ context_var = i.next()
+ except StopIteration:
+ pass
+ if queryset_var is None:
+ raise template.TemplateSyntaxError(
+ "Invalid syntax. Proper usage of this tag is: "
+ "{%% autopaginate QUERYSET [PAGINATE_BY] [ORPHANS]"
+ " [as CONTEXT_VAR_NAME] %%}"
+ )
+ return AutoPaginateNode(queryset_var, paginate_by, orphans, context_var)
+
+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, and using
+ that object, it emits 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 available pages, or else the application may seem to be buggy.
+ """
+ def __init__(self, queryset_var, paginate_by=None,
+ orphans=None, context_var=None):
+ if paginate_by is None:
+ paginate_by = DEFAULT_PAGINATION
+ if orphans is None:
+ orphans = DEFAULT_ORPHANS
+ self.queryset_var = template.Variable(queryset_var)
+ if isinstance(paginate_by, int):
+ self.paginate_by = paginate_by
+ else:
+ self.paginate_by = template.Variable(paginate_by)
+ if isinstance(orphans, int):
+ self.orphans = orphans
+ else:
+ self.orphans = template.Variable(orphans)
+ self.context_var = context_var
+
+ def render(self, context):
+ key = self.queryset_var.var
+ value = self.queryset_var.resolve(context)
+ if isinstance(self.paginate_by, int):
+ paginate_by = self.paginate_by
+ else:
+ paginate_by = self.paginate_by.resolve(context)
+ if isinstance(self.orphans, int):
+ orphans = self.orphans
+ else:
+ orphans = self.orphans.resolve(context)
+ paginator = Paginator(value, paginate_by, orphans)
+ try:
+ page_obj = paginator.page(context['request'].page)
+ except InvalidPage:
+ if INVALID_PAGE_RAISES_404:
+ raise Http404('Invalid page requested. If DEBUG were set to ' +
+ 'False, an HTTP 404 page would have been shown instead.')
+ context[key] = []
+ context['invalid_page'] = True
+ return u''
+ if self.context_var is not None:
+ context[self.context_var] = page_obj.object_list
+ else:
+ context[key] = page_obj.object_list
+ context['paginator'] = paginator
+ context['page_obj'] = page_obj
+ return u''
+
+
+def paginate(context, window=DEFAULT_WINDOW, hashtag=''):
+ """
+ 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
+ # Calculate the record range in the current page for display.
+ records = {'first': 1 + (page_obj.number - 1) * paginator.per_page}
+ records['last'] = records['first'] + paginator.per_page - 1
+ if records['last'] + paginator.orphans >= paginator.count:
+ records['last'] = paginator.count
+ # 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 = list(first)
+ first_list.sort()
+ second_list = list(current)
+ second_list.sort()
+ 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:
+ unioned = list(first.union(current))
+ unioned.sort()
+ pages.extend(unioned)
+ # 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 = list(last)
+ second_list.sort()
+ 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:
+ differenced = list(last.difference(current))
+ differenced.sort()
+ pages.extend(differenced)
+ to_return = {
+ 'MEDIA_URL': settings.MEDIA_URL,
+ 'pages': pages,
+ 'records': records,
+ 'page_obj': page_obj,
+ 'paginator': paginator,
+ 'hashtag': hashtag,
+ '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, AttributeError:
+ return {}
+
+register.inclusion_tag('pagination/pagination.html', takes_context=True)(
+ paginate)
+register.tag('autopaginate', do_autopaginate)
fnp / django-pagination.git / blobdiff