1 """
2 Usage:
3 query = User.gql('order by lastname')
4 pager = Paginator(query,url="/userlist/",pagesize=5)
5 results,pager = pager.fetch(offset)
6
7 """
8 class Paginator(object):
9 def __init__(self,query=None,pagesize=5,url=None):
10 self.query = query
11 self.pagesize = pagesize
12 if not url.endswith('/'):
13 self.url = url + '/'
14 else:
15 self.url = url
16
17 def fetch(self,offset):
18 results =self.query.fetch(100,offset)
19 output = self.create_links(offset,len(results))
20 return (results[:self.pagesize],output)
21
22 def create_links(self,offset,count):
23 num_links = 5
24 if count % self.pagesize ==0 :
25 num_pages = count/self.pagesize -1
26 else:
27 num_pages = count/self.pagesize
28
29 cur_page = offset/self.pagesize + 1
30 start_page = 1
31 end_page = cur_page + num_links
32
33 if cur_page - num_links >0:
34 start_page = cur_page - num_links + 1
35 if num_pages < num_links:
36 end_page = cur_page + num_pages
37
38 if end_page==1:
39 return ''
40 links = []
41
42 for i in range(start_page,end_page+1):
43 links_item = {}
44 links_item['index'] = i
45 links_item['offset'] = (i-1) * self.pagesize
46 links.append(links_item)
47
48 pagelinks = {}
49 pagelinks['item'] = links
50 pagelinks['cur_page'] = cur_page
51 if cur_page>1:
52 pagelinks['prev'] = offset - self.pagesize
53 else:
54 pagelinks['prev'] = None
55
56 if cur_page < end_page:
57 pagelinks['next'] = offset + self.pagesize
58 else:
59 pagelinks['next'] = None
60
61 output = '';
62 if pagelinks['prev'] is not None:
63 output += '<a href="%s%s">上一页</a> ' % (self.url,pagelinks['prev'])
64 for i in pagelinks['item']:
65 if i['index'] != pagelinks['cur_page']:
66 output += '<a href="%s%s">%s</a> ' % (self.url,i['offset'],i['index'])
67 else:
68 output += ' %s ' % (i['index'])
69 if pagelinks['next'] is not None:
70 output += '<a href="%s%s">下一页</a> ' % (self.url,pagelinks['next'])
71 return output
