Mercurial > piecrust2

annotate piecrust/data/paginator.py @ 867:757fba54bfd3

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refactor: Improve pagination and iterators to work with other sources. This makes the assets work as a pagination source again.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 12 Jun 2017 22:20:58 -0700
parents 08e02c2a2a1a
children dcdec4b951a1
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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
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5
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6 logger = logging.getLogger(__name__)
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7
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8
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9 class Paginator(object):
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10 debug_render = [
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11 'has_more', 'items', 'has_items', 'items_per_page',
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12 'items_this_page', 'prev_page_number', 'this_page_number',
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13 'next_page_number', 'prev_page', 'next_page',
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14 'total_item_count', 'total_page_count',
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15 'next_item', 'prev_item']
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16 debug_render_invoke = [
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17 'has_more', 'items', 'has_items', 'items_per_page',
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18 'items_this_page', 'prev_page_number', 'this_page_number',
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19 'next_page_number', 'prev_page', 'next_page',
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20 'total_item_count', 'total_page_count',
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21 'next_item', 'prev_item']
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22
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23 def __init__(self, source, current_page, sub_num, *,
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24 pgn_filter=None, items_per_page=-1):
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25 self._source = source
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26 self._page = current_page
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27 self._sub_num = sub_num
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28 self._iterator = None
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29 self._pgn_filter = pgn_filter
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30 self._items_per_page = items_per_page
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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._items_per_page > 0:
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87 return self._items_per_page
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88
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89 ipp = self._page.config.get('items_per_page')
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90 if ipp is not None:
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91 return ipp
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92
867
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93 from piecrust.sources.base import ContentSource
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94 if isinstance(self._source, ContentSource):
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95 ipp = self._source.config.get('items_per_page')
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96 if ipp is not None:
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97 return ipp
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98
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99 raise Exception("No way to figure out how many items to display "
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100 "per page.")
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101
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102 @property
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103 def items_this_page(self):
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104 self._load()
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105 return len(self._iterator)
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106
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107 @property
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108 def prev_page_number(self):
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109 if self._sub_num > 1:
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110 return self._sub_num - 1
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111 return None
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112
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113 @property
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114 def this_page_number(self):
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115 return self._sub_num
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116
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117 @property
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118 def next_page_number(self):
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119 self._load()
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120 if self._iterator._has_more:
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121 return self._sub_num + 1
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122 return None
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123
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124 @property
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125 def prev_page(self):
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126 num = self.prev_page_number
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127 if num is not None:
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128 return self._getPageUri(num)
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129 return None
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130
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131 @property
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132 def this_page(self):
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133 return self._getPageUri(self._sub_num)
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134
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135 @property
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136 def next_page(self):
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137 num = self.next_page_number
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138 if num is not None:
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139 return self._getPageUri(num)
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140 return None
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141
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142 @property
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143 def total_item_count(self):
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144 self._load()
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145 return self._iterator.total_count
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146
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147 @property
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148 def total_page_count(self):
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149 total_count = self.total_item_count
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150 per_page = self.items_per_page
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151 return int(math.ceil(total_count / per_page))
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152
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153 @property
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154 def next_item(self):
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155 self._load()
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156 return self._iterator.prev_page
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157
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158 @property
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159 def prev_item(self):
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160 self._load()
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161 return self._iterator.next_page
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162
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163 def all_page_numbers(self, radius=-1):
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164 total_page_count = self.total_page_count
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165 if total_page_count == 0:
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166 return []
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167
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168 if radius <= 0 or total_page_count < (2 * radius + 1):
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169 return list(range(1, total_page_count + 1))
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170
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171 first_num = self._sub_num - radius
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172 last_num = self._sub_num + radius
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173 if first_num <= 0:
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174 last_num += 1 - first_num
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175 first_num = 1
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176 elif last_num > total_page_count:
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177 first_num -= (last_num - total_page_count)
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178 last_num = total_page_count
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179 first_num = max(1, first_num)
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180 last_num = min(total_page_count, last_num)
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181 return list(range(first_num, last_num + 1))
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182
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183 def page(self, index):
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184 return self._getPageUri(index)
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185
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186 def _load(self):
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187 if self._iterator is not None:
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188 return
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189
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190 from piecrust.data.filters import PaginationFilter
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191 from piecrust.dataproviders.pageiterator import (
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192 PageIterator, HardCodedFilterIterator)
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193 from piecrust.sources.base import ContentSource
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194
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195 self._iterator = PageIterator(
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196 self._source,
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197 current_page=self._page)
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198
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199 if self._pgn_filter is not None:
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200 pag_fil = PaginationFilter()
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201 pag_fil.addClause(self._pgn_filter.root_clause)
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202 self._iterator._simpleNonSortedWrap(
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203 HardCodedFilterIterator, pag_fil)
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204
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205 offset = (self._sub_num - 1) * self.items_per_page
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206 limit = self.items_per_page
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207 self._iterator.slice(offset, limit)
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208
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209 self._iterator._lockIterator()
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210
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211 if isinstance(self._source, ContentSource):
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212 self._onIteration(self._iterator)
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213
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214 def _getPageUri(self, index):
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215 return self._page.getUri(index)
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216
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217 def _onIteration(self, it):
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218 if not self._pgn_set_on_ctx:
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219 rcs = self._page.app.env.render_ctx_stack
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220 rcs.current_ctx.setPagination(self)
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221 self._pgn_set_on_ctx = True
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222