Mercurial > piecrust2

annotate piecrust/data/paginator.py @ 298:b7ab1b503510

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data: Fix incorrect next/previous page URLs in pagination data. Consolidate splitting an URL between its first URL and its sub page number. Be careful about the index page's URL not losing its slash.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 11 Mar 2015 23:46:42 -0700
parents 9b75b49a4084
children eb958151c8dc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
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1 import math
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2 import logging
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3 from werkzeug.utils import cached_property
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8c0c53a315ae data: Correctly build pagination filters when we know items are pages.
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4 from piecrust.data.filters import PaginationFilter, page_value_accessor
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5 from piecrust.data.iterators import PageIterator
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f130365568ff internal: Code reorganization to put less stuff in `sources.base`.
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6 from piecrust.sources.interfaces import IPaginationSource
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7
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8
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9 logger = logging.getLogger(__name__)
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10
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11
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12 class Paginator(object):
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13 debug_render = ['has_more', 'items', 'has_items', 'items_per_page',
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14 'items_this_page', 'prev_page_number', 'this_page_number',
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15 'next_page_number', 'prev_page', 'next_page',
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16 'total_item_count', 'total_page_count',
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17 'next_item', 'prev_item']
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18 debug_render_invoke = ['has_more', 'items', 'has_items', 'items_per_page',
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19 'items_this_page', 'prev_page_number', 'this_page_number',
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20 'next_page_number', 'prev_page', 'next_page',
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21 'total_item_count', 'total_page_count',
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22 'next_item', 'prev_item']
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23
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24 def __init__(self, page, source, uri, page_num=1, pgn_filter=None,
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25 items_per_page=-1):
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26 self._parent_page = page
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27 self._source = source
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28 self._uri = uri
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29 self._page_num = page_num
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30 self._iterator = None
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31 self._pgn_filter = pgn_filter
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32 self._items_per_page = items_per_page
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33 self._pgn_set_on_ctx = False
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34
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35 @property
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36 def is_loaded(self):
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37 return self._iterator is not None
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38
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39 @property
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40 def has_more(self):
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41 return self.next_page_number is not None
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42
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43 @property
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44 def unload(self):
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45 self._iterator = None
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46
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47 # Backward compatibility with PieCrust 1.0 {{{
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48 @property
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49 def posts(self):
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50 return self.items
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51
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52 @property
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53 def has_posts(self):
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54 return self.has_items
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55
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56 @property
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57 def posts_per_page(self):
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58 return self.items_per_page
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59
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60 @property
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61 def posts_this_page(self):
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62 return self.items_this_page
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63
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64 @property
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65 def total_post_count(self):
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66 return self.total_item_count
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67
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68 @property
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69 def next_post(self):
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70 return self.next_item
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71
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72 @property
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73 def prev_post(self):
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74 return self.prev_item
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75 # }}}
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76
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77 @property
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78 def items(self):
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79 self._load()
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80 return self._iterator
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81
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82 @property
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83 def has_items(self):
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84 return self.posts_this_page > 0
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85
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86 @cached_property
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87 def items_per_page(self):
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88 if self._items_per_page > 0:
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89 return self._items_per_page
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90 if self._parent_page:
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91 ipp = self._parent_page.config.get('items_per_page')
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92 if ipp is not None:
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93 return ipp
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94 if isinstance(self._source, IPaginationSource):
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95 return self._source.getItemsPerPage()
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96 raise Exception("No way to figure out how many items to display "
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97 "per page.")
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98
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99 @property
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100 def items_this_page(self):
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101 self._load()
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102 return len(self._iterator)
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103
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104 @property
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105 def prev_page_number(self):
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106 if self._page_num > 1:
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107 return self._page_num - 1
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108 return None
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109
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110 @property
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111 def this_page_number(self):
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112 return self._page_num
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113
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114 @property
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115 def next_page_number(self):
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116 self._load()
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117 if self._iterator._has_more:
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118 return self._page_num + 1
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119 return None
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120
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121 @property
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122 def prev_page(self):
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123 num = self.prev_page_number
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124 if num is not None:
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125 return self._getPageUri(num)
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126 return None
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127
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128 @property
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129 def this_page(self):
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130 return self._getPageUri(self._page_num)
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131
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132 @property
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133 def next_page(self):
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134 num = self.next_page_number
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135 if num is not None:
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136 return self._getPageUri(num)
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137 return None
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138
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139 @property
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140 def total_item_count(self):
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141 self._load()
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142 return self._iterator.total_count
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143
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144 @property
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145 def total_page_count(self):
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146 total_count = self.total_item_count
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147 per_page = self.items_per_page
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148 return int(math.ceil(total_count / per_page))
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149
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150 @property
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151 def next_item(self):
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152 self._load()
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153 return self._iterator.prev_page
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154
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155 @property
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156 def prev_item(self):
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157 self._load()
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158 return self._iterator.next_page
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159
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160 def all_page_numbers(self, radius=-1):
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161 total_page_count = self.total_page_count
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162 if total_page_count == 0:
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163 return []
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164
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165 if radius <= 0 or total_page_count < (2 * radius + 1):
6
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166 return list(range(1, total_page_count + 1))
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167
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168 first_num = self._page_num - radius
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169 last_num = self._page_num + radius
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170 if first_num <= 0:
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171 last_num += 1 - first_num
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172 first_num = 1
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173 elif last_num > total_page_count:
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174 first_num -= (last_num - total_page_count)
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175 last_num = total_page_count
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176 first_num = max(1, first_num)
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177 last_num = min(total_page_count, last_num)
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178 return list(range(first_num, last_num + 1))
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179
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180 def page(self, index):
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181 return self._getPageUri(index)
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182
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183 def _load(self):
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184 if self._iterator is not None:
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185 return
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186
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187 if self._source is None:
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188 raise Exception("Can't load pagination data: no source has been defined.")
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189
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190 pag_filter = self._getPaginationFilter()
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191 offset = (self._page_num - 1) * self.items_per_page
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192 self._iterator = PageIterator(self._source,
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193 current_page=self._parent_page,
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194 pagination_filter=pag_filter,
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195 offset=offset, limit=self.items_per_page,
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196 locked=True)
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197 self._iterator._iter_event += self._onIteration
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198
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199 def _getPaginationFilter(self):
280
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200 f = PaginationFilter(value_accessor=page_value_accessor)
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201
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202 if self._pgn_filter is not None:
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203 f.addClause(self._pgn_filter.root_clause)
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204
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205 if isinstance(self._source, IPaginationSource):
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206 sf = self._source.getPaginationFilter(self._parent_page)
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207 if sf is not None:
289
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208 f.addClause(sf.root_clause)
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209
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210 return f
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211
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212 def _getPageUri(self, index):
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213 uri = self._uri
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214 if index > 1:
298
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diff changeset
215 if not uri.endswith('/'):
3
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216 uri += '/'
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217 uri += str(index)
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218 return uri
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219
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220 def _onIteration(self):
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221 if self._parent_page is not None and not self._pgn_set_on_ctx:
3
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222 eis = self._parent_page.app.env.exec_info_stack
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223 eis.current_page_info.render_ctx.setPagination(self)
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224 self._pgn_set_on_ctx = True
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225