Ticket #6860: 0005-Improve-the-new-paginator.diff

django/core/paginator.py

@@ +1 @@
+from django.utils.translation import ugettext as _
+from django.utils.safestring import mark_safe
+from django.http import Http404
+
 class InvalidPage(Exception):
     pass
 
+class PageList(object):
+    def __init__(self, paginator):
+        self.curpage = paginator.page(paginator.curpage)
+        self.adjacent_count = paginator.adjacent_count
+
+    def __repr__(self):
+        return '<PageList current: %d - total:%d>' % \
+            (self.curpage.paginator.curpage, self.curpage.paginator.num_pages)
+
+    def _add_range_as_element(self, open, close, start, end):
+        markup = ''
+        for i in range(start, end + 1):
+            page = self.curpage.paginator.page(i)
+            if self.curpage.number == i:
+                markup += '%s<a class="curpage">%d</a>%s' % \
+                    (open, i, close)
+            else:
+                markup += '%s<a href="%s">%d</a>%s' % \
+                    (open, page.url(), i, close)
+        return markup
+
+    def _as_html(self, el, subel_open, subel_close):
+        markup = '<%s class="pagelist">' % el
+        if self.curpage.has_previous() or self.curpage.has_next():
+            markup += '%s<%s class="prev-next">' % (subel_open, el)
+            if self.curpage.has_previous():
+                markup += '%s<a href="%s">&laquo; %s</a>%s' % \
+                        (subel_open, self.curpage.previous_page_url(),
+                         _('Previous'), subel_close)
+            if self.curpage.has_next():
+                markup += '%s<a href="%s">%s &raquo;</a>%s' % \
+                        (subel_open, self.curpage.next_page_url(),
+                        _('Next'), subel_close)
+            markup += '</%s>%s' % (el, subel_close)
+        else:
+            return u''
+
+        markup += '%s<%s class="start">' % (subel_open, el)
+        end = self.adjacent_count + 1
+        if end > self.curpage.paginator.num_pages:
+            end = self.curpage.paginator.num_pages
+        if end == self.curpage.number:
+            end -= 1
+        markup += self._add_range_as_element(subel_open, subel_close, 1, end)
+        markup += '</%s>%s' % (el, subel_close)
+
+        if self.curpage.number > self.adjacent_count:
+            midstart = self.curpage.number - self.adjacent_count
+            if midstart <= self.adjacent_count:
+                midstart = self.adjacent_count + 1
+            midend = self.curpage.number + self.adjacent_count
+            if midend > self.curpage.paginator.num_pages:
+                midend = self.curpage.paginator.num_pages
+            markup += '%s<%s class="middle">' % (subel_open, el)
+            markup += self._add_range_as_element(subel_open, subel_close,
+                    midstart, midend)
+            markup += '</%s>%s' % (el, subel_close)
+
+
+        start = self.curpage.paginator.num_pages - self.adjacent_count
+        if start > self.adjacent_count and start > self.curpage.number + self.adjacent_count:
+            markup += '%s<%s class="end">' % (subel_open, el)
+            markup += self._add_range_as_element(subel_open, subel_close,
+                    start, self.curpage.paginator.num_pages)
+            markup += '</%s>%s' % (el, subel_close)
+        markup += '</%s>' % el
+
+        return mark_safe(markup)
+
+    def as_ul(self):
+        return self._as_html('ul', '<li>', '</li>')
+
+    def as_div(self):
+        return self._as_html('div', '', '')
+
+
 class Paginator(object):
-    def __init__(self, object_list, per_page, orphans=0, allow_empty_first_page=True):
+    def __init__(self, object_list, per_page, orphans=0, allow_empty_first_page=True, base_url=None, adjacent_count=2, current=None):
         self.object_list = object_list
         self.per_page = per_page
         self.orphans = orphans
         self.allow_empty_first_page = allow_empty_first_page
+        self.base_url = base_url
+        self.curpage = current
+        self.adjacent_count = adjacent_count
         self._num_pages = self._count = None
 
     def validate_number(self, number):
@@ -31 +114 @@
         top = bottom + self.per_page
         if top + self.orphans >= self.count:
             top = self.count
+        if self.curpage is None:
+            self.curpage = number
         return Page(self.object_list[bottom:top], number, self)
 
+    def page_or_404(self, number):
+        try:
+            return self.page(number)
+        except InvalidPage:
+            raise Http404(_('Invalid page'))
+
     def _get_count(self):
         "Returns the total number of objects, across all pages."
         if self._count is None:
@@ -61 +152 @@
         return range(1, self.num_pages + 1)
     page_range = property(_get_page_range)
 
+    def _get_page_list(self):
+        return PageList(self)
+    page_list = property(_get_page_list)
+
 class QuerySetPaginator(Paginator):
     """
     Like Paginator, but works on QuerySets.
@@ -95 +190 @@
     def previous_page_number(self):
         return self.number - 1
 
+    def next_page_url(self):
+        return self.paginator.base_url % self.next_page_number()
+
+    def previous_page_url(self):
+        return self.paginator.base_url % self.previous_page_number()
+
+    def url(self):
+        return self.paginator.base_url % self.number
+
     def start_index(self):
         """
         Returns the 1-based index of the first object on this page,