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annotate piecrust/data/paginator.py @ 7:343d08ef5668

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More PieCrust 3 fixes, and a couple of miscellaneous bug fixes.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 16 Aug 2014 15:07:22 -0700
parents f5ca5c5bed85
children dc8a6ff88f37
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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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4 from piecrust.data.base import IPaginationSource
3
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5 from piecrust.data.filters import PaginationFilter
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6 from piecrust.data.iterators import PageIterator
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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 self._parent_page = page
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26 self._source = source
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27 self._uri = uri
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28 self._page_num = page_num
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29 self._iterator = None
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30 self._pgn_filter = pgn_filter
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31 self._pgn_set_on_ctx = False
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32
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33 @property
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34 def is_loaded(self):
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35 return self._iterator is not None
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36
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37 @property
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38 def has_more(self):
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39 return self.next_page_number is not None
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40
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41 @property
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42 def unload(self):
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43 self._iterator = None
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44
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45 # Backward compatibility with PieCrust 1.0 {{{
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46 @property
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47 def posts(self):
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48 return self.items
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49
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50 @property
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51 def has_posts(self):
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52 return self.has_items
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53
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54 @property
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55 def posts_per_page(self):
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56 return self.items_per_page
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57
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58 @property
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59 def posts_this_page(self):
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60 return self.items_this_page
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61
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62 @property
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63 def total_post_count(self):
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64 return self.total_item_count
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65
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66 @property
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67 def next_post(self):
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68 return self.next_item
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69
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70 @property
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71 def prev_post(self):
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72 return self.prev_item
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73 # }}}
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74
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75 @property
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76 def items(self):
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77 self._load()
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78 return self._iterator
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79
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80 @property
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81 def has_items(self):
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82 return self.posts_this_page > 0
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83
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84 @cached_property
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85 def items_per_page(self):
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86 if self._parent_page:
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87 ipp = self._parent_page.config.get('items_per_page')
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88 if ipp is not None:
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89 return ipp
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90 return self._source.getItemsPerPage()
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91
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92 @property
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93 def items_this_page(self):
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94 self._load()
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95 return len(self._iterator)
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96
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97 @property
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98 def prev_page_number(self):
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99 if self._page_num > 1:
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100 return self._page_num - 1
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101 return None
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102
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103 @property
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104 def this_page_number(self):
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105 return self._page_num
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106
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107 @property
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108 def next_page_number(self):
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109 self._load()
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110 if self._iterator._has_more:
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111 return self._page_num + 1
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112 return None
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113
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114 @property
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115 def prev_page(self):
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116 num = self.prev_page_number
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117 if num is not None:
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118 return self._getPageUri(num)
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119 return None
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120
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121 @property
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122 def this_page(self):
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123 return self._getPageUri(self._page_num)
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124
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125 @property
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126 def next_page(self):
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127 num = self.next_page_number
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128 if num is not None:
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129 return self._getPageUri(num)
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130 return None
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131
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132 @property
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133 def total_item_count(self):
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134 self._load()
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135 return self._iterator.total_count
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136
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137 @property
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138 def total_page_count(self):
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139 total_count = self.total_item_count
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140 per_page = self.items_per_page
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141 return int(math.ceil(total_count / per_page))
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142
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143 @property
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144 def next_item(self):
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145 self._load()
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146 return self._iterator.prev_page
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147
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148 @property
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149 def prev_item(self):
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150 self._load()
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151 return self._iterator.next_page
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152
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153 def all_page_numbers(self, radius=-1):
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154 total_page_count = self.total_page_count
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155 if total_page_count == 0:
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156 return []
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157
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158 if radius <= 0 or total_page_count < (2 * radius + 1):
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159 return list(range(1, total_page_count + 1))
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160
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161 first_num = self._page_num - radius
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162 last_num = self._page_num + radius
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163 if first_num <= 0:
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164 last_num += 1 - first_num
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165 first_num = 1
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166 elif last_num > total_page_count:
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167 first_num -= (last_num - total_page_count)
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168 last_num = total_page_count
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169 first_num = max(1, first_num)
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170 last_num = min(total_page_count, last_num)
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171 return list(range(first_num, last_num + 1))
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172
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173 def page(self, index):
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174 return self._getPageUri(index)
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175
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176 def _load(self):
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177 if self._iterator is not None:
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178 return
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179
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180 if self._source is None:
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181 raise Exception("Can't load pagination data: no source has been defined.")
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182
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183 pag_filter = self._getPaginationFilter()
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184 offset = (self._page_num - 1) * self.items_per_page
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185 self._iterator = PageIterator(self._source,
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186 current_page=self._parent_page,
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187 pagination_filter=pag_filter,
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188 offset=offset, limit=self.items_per_page,
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189 locked=True)
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190 self._iterator._iter_event += self._onIteration
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191
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192 def _getPaginationFilter(self):
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193 f = PaginationFilter()
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194
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195 if self._pgn_filter is not None:
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196 f.addClause(self._pgn_filter.root_clause)
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197
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198 if isinstance(self._source, IPaginationSource):
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199 sf = self._source.getPaginationFilter(self._parent_page)
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200 if sf is not None:
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201 f.addClause(sf)
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202
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203 return f
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204
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205 def _getPageUri(self, index):
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206 uri = self._uri
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207 if index > 1:
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208 if uri != '':
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209 uri += '/'
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210 uri += str(index)
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211 return uri
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212
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213 def _onIteration(self):
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214 if self._parent_page is not None and not self._pgn_set_on_ctx:
3
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215 eis = self._parent_page.app.env.exec_info_stack
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216 eis.current_page_info.render_ctx.setPagination(self)
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217 self._pgn_set_on_ctx = True
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218