"""

自定义分页组件的使用方法：

    pager_obj = Pagination(request.GET.get('page',1),len(HOST_LIST),request.path_info,request.GET)

    host_list = HOST_LIST[pager_obj.start:pager_obj.end]

    html = pager_obj.page_html()

    return render(request,'hosts.html',{'host_list':host_list,"page_html":html})

"""

class Pagination(object):

    """

    自定义分页

    """

    def __init__(self,current_page,total_count,base_url,params,per_page_count=10,max_pager_count=11):

        try:

            current_page = int(current_page)

        except Exception as e:

            current_page = 1

        if current_page <=0:

            current_page = 1

        self.current_page = current_page

        # 数据总条数

        self.total_count = total_count

        # 每页显示10条数据

        self.per_page_count = per_page_count

        # 页面上应该显示的最大页码

        max_page_num, div = divmod(total_count, per_page_count)

        if div:

            max_page_num += 1

        self.max_page_num = max_page_num

        # 页面上默认显示11个页面（当前页在中间）

        self.max_pager_count = max_pager_count

        self.half_max_pager_count = int((max_pager_count - 1) / 2)

        # URL前缀

        self.base_url = base_url

        # request.GET

        import copy

        params = copy.deepcopy(params)

        params._mutable = True

        # 包含当前列表页面所有的搜索条件

        # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}

        # self.params[page] = 8

        # self.params.urlencode()

        # source=2&status=2&gender=2&consultant=1&page=8

        # href="/hosts/?source=2&status=2&gender=2&consultant=1&page=8"

        # href="%s?%s" %(self.base_url,self.params.urlencode())

        self.params = params

    @property

    def start(self):

        return (self.current_page - 1) * self.per_page_count

    @property

    def end(self):

        return self.current_page * self.per_page_count

    def page_html(self):

        # 如果总页数 <= 11

        if self.max_page_num <= self.max_pager_count:

            pager_start = 1

            pager_end = self.max_page_num

        # 如果总页数 > 11

        else:

            # 如果当前页 <= 5

            if self.current_page <= self.half_max_pager_count:

                pager_start = 1

                pager_end = self.max_pager_count

            else:

                # 当前页 + 5 > 总页码

                if (self.current_page + self.half_max_pager_count) > self.max_page_num:

                    pager_end = self.max_page_num

                    pager_start = self.max_page_num - self.max_pager_count + 1

                else:

                    pager_start = self.current_page - self.half_max_pager_count

                    pager_end = self.current_page + self.half_max_pager_count

        page_html_list = []

        # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}

        self.params['page'] = 1

        first_page = '<a href="%s?%s">首页</a>' % (self.base_url,self.params.urlencode(),)

        page_html_list.append(first_page)

        # 上一页

        for i in range(pager_start, pager_end + 1):

            self.params['page'] = i

            if i == self.current_page:

                temp = '<a class="active" href="%s?%s">%s</a>' % (self.base_url,self.params.urlencode(), i,)

            else:

                temp = '<a href="%s?%s">%s</a>' % (self.base_url,self.params.urlencode(), i,)

            page_html_list.append(temp)

        # 下一页

        self.params['page'] = self.max_page_num

        last_page = '<a href="%s?%s">尾页</a>' % (self.base_url, self.params.urlencode(),)

        page_html_list.append(last_page)

        return ''.join(page_html_list)

    def bootstrap_page_html(self):

        # 如果总页数 <= 11

        if self.max_page_num <= self.max_pager_count:

            pager_start = 1

            pager_end = self.max_page_num

        # 如果总页数 > 11

        else:

            # 如果当前页 <= 5

            if self.current_page <= self.half_max_pager_count:

                pager_start = 1

                pager_end = self.max_pager_count

            else:

                # 当前页 + 5 > 总页码

                if (self.current_page + self.half_max_pager_count) > self.max_page_num:

                    pager_end = self.max_page_num

                    pager_start = self.max_page_num - self.max_pager_count + 1

                else:

                    pager_start = self.current_page - self.half_max_pager_count

                    pager_end = self.current_page + self.half_max_pager_count

        page_html_list = []

        # {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}

        self.params['page'] = 1

        first_page = '<li><a href="%s?%s">首页</a></li>' % (self.base_url,self.params.urlencode(),)

        page_html_list.append(first_page)

        # 上一页

        for i in range(pager_start, pager_end + 1):

            self.params['page'] = i

            if i == self.current_page:

                temp = '<li class="active" ><a href="%s?%s">%s</a></li>' % (self.base_url,self.params.urlencode(), i,)

            else:

                temp = '<li><a href="%s?%s">%s</a></li>' % (self.base_url,self.params.urlencode(), i,)

            page_html_list.append(temp)

        # 下一页

        self.params['page'] = self.max_page_num

        last_page = '<li><a href="%s?%s">尾页</a></li>' % (self.base_url, self.params.urlencode(),)

        page_html_list.append(last_page)

        return ''.join(page_html_list)

from utils.pager import Pagination

current_page = self.request.GET.get('page', 1)  #获取用户请的页码，如果没有默认设置为1

total_count = queryset.count()      #统计所有数据个数

page_obj = Pagination(current_page, total_count, self.request.path_info, self.request.GET, per_page_count=10)

self.page_obj = page_obj     

self.data_list = queryset[page_obj.start:page_obj.end]