Mercurial > piecrust2

annotate piecrust/data/paginator.py @ 352:498a917cd2d4

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pagination: Make pagination use routes to generate proper URLs. This fixes incorrect URLs when using custom sub-page suffixes, for instance. Add tests.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 17 Apr 2015 16:09:30 -0700
parents eb958151c8dc
children 4b1019bb2533
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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 = [
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14 'has_more', 'items', 'has_items', 'items_per_page',
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15 'items_this_page', 'prev_page_number', 'this_page_number',
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16 'next_page_number', 'prev_page', 'next_page',
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17 'total_item_count', 'total_page_count',
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18 'next_item', 'prev_item']
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19 debug_render_invoke = [
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20 'has_more', 'items', 'has_items', 'items_per_page',
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21 'items_this_page', 'prev_page_number', 'this_page_number',
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22 'next_page_number', 'prev_page', 'next_page',
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23 'total_item_count', 'total_page_count',
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24 'next_item', 'prev_item']
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25
352
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26 def __init__(self, page, source, page_num=1, pgn_filter=None,
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27 items_per_page=-1):
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28 self._parent_page = page
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29 self._source = source
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30 self._page_num = page_num
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31 self._route = None
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32 self._iterator = None
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33 self._pgn_filter = pgn_filter
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34 self._items_per_page = items_per_page
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35 self._pgn_set_on_ctx = False
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36
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37 @property
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38 def is_loaded(self):
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39 return self._iterator is not None
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40
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41 @property
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42 def has_more(self):
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43 return self.next_page_number is not None
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44
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45 @property
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46 def unload(self):
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47 self._iterator = None
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48
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49 # Backward compatibility with PieCrust 1.0 {{{
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50 @property
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51 def posts(self):
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52 return self.items
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53
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54 @property
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55 def has_posts(self):
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56 return self.has_items
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57
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58 @property
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59 def posts_per_page(self):
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60 return self.items_per_page
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61
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62 @property
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63 def posts_this_page(self):
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64 return self.items_this_page
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65
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66 @property
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67 def total_post_count(self):
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68 return self.total_item_count
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69
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70 @property
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71 def next_post(self):
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72 return self.next_item
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73
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74 @property
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75 def prev_post(self):
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76 return self.prev_item
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77 # }}}
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78
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79 @property
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80 def items(self):
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81 self._load()
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82 return self._iterator
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83
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84 @property
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85 def has_items(self):
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86 return self.posts_this_page > 0
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87
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88 @cached_property
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89 def items_per_page(self):
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90 if self._items_per_page > 0:
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91 return self._items_per_page
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92 if self._parent_page:
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93 ipp = self._parent_page.config.get('items_per_page')
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94 if ipp is not None:
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95 return ipp
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96 if isinstance(self._source, IPaginationSource):
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97 return self._source.getItemsPerPage()
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98 raise Exception("No way to figure out how many items to display "
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99 "per page.")
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100
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101 @property
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102 def items_this_page(self):
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103 self._load()
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104 return len(self._iterator)
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105
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106 @property
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107 def prev_page_number(self):
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108 if self._page_num > 1:
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109 return self._page_num - 1
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110 return None
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111
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112 @property
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113 def this_page_number(self):
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114 return self._page_num
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115
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116 @property
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117 def next_page_number(self):
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118 self._load()
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119 if self._iterator._has_more:
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120 return self._page_num + 1
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121 return None
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122
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123 @property
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124 def prev_page(self):
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125 num = self.prev_page_number
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126 if num is not None:
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127 return self._getPageUri(num)
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128 return None
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129
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130 @property
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131 def this_page(self):
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132 return self._getPageUri(self._page_num)
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133
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134 @property
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135 def next_page(self):
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136 num = self.next_page_number
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137 if num is not None:
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138 return self._getPageUri(num)
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139 return None
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140
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141 @property
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142 def total_item_count(self):
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143 self._load()
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144 return self._iterator.total_count
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145
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146 @property
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147 def total_page_count(self):
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148 total_count = self.total_item_count
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149 per_page = self.items_per_page
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150 return int(math.ceil(total_count / per_page))
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151
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152 @property
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153 def next_item(self):
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154 self._load()
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155 return self._iterator.prev_page
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156
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157 @property
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158 def prev_item(self):
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159 self._load()
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160 return self._iterator.next_page
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161
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162 def all_page_numbers(self, radius=-1):
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163 total_page_count = self.total_page_count
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164 if total_page_count == 0:
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165 return []
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166
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167 if radius <= 0 or total_page_count < (2 * radius + 1):
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168 return list(range(1, total_page_count + 1))
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169
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170 first_num = self._page_num - radius
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171 last_num = self._page_num + radius
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172 if first_num <= 0:
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173 last_num += 1 - first_num
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174 first_num = 1
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175 elif last_num > total_page_count:
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176 first_num -= (last_num - total_page_count)
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177 last_num = total_page_count
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178 first_num = max(1, first_num)
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179 last_num = min(total_page_count, last_num)
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180 return list(range(first_num, last_num + 1))
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181
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182 def page(self, index):
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183 return self._getPageUri(index)
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184
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185 def _load(self):
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186 if self._iterator is not None:
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187 return
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188
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189 if self._source is None:
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190 raise Exception("Can't load pagination data: no source has "
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191 "been defined.")
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192
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193 pag_filter = self._getPaginationFilter()
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194 offset = (self._page_num - 1) * self.items_per_page
352
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195 self._iterator = PageIterator(
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196 self._source,
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197 current_page=self._parent_page,
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198 pagination_filter=pag_filter,
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199 offset=offset, limit=self.items_per_page,
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200 locked=True)
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201 self._iterator._iter_event += self._onIteration
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202
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203 def _getPaginationFilter(self):
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204 f = PaginationFilter(value_accessor=page_value_accessor)
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205
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206 if self._pgn_filter is not None:
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207 f.addClause(self._pgn_filter.root_clause)
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208
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209 if isinstance(self._source, IPaginationSource):
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210 sf = self._source.getPaginationFilter(self._parent_page)
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211 if sf is not None:
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212 f.addClause(sf.root_clause)
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213
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214 return f
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215
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216 def _getPageUri(self, index):
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217 if self._route is None:
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218 app = self._source.app
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219 self._route = app.getRoute(self._parent_page.source.name,
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220 self._parent_page.source_metadata)
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221 if self._route is None:
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222 raise Exception("Can't get route for page: %s" %
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223 self._parent_page.path)
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224
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225 return self._route.getUri(self._parent_page.source_metadata,
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226 provider=self._parent_page,
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227 sub_num=index)
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228
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229 def _onIteration(self):
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230 if self._parent_page is not None and not self._pgn_set_on_ctx:
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231 eis = self._parent_page.app.env.exec_info_stack
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232 eis.current_page_info.render_ctx.setPagination(self)
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233 self._pgn_set_on_ctx = True
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234