Mercurial > piecrust2

annotate piecrust/data/paginator.py @ 1143:1c324407bd1f

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internal: Cleanup in the paginator's code.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 05 Jun 2018 21:59:41 -0700
parents 492b66482f12
children
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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4 from piecrust.sources.base import ContentSource
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6
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7 logger = logging.getLogger(__name__)
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8
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9
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10 class Paginator(object):
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11 debug_render = [
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12 'has_more', 'items', 'has_items', 'items_per_page',
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13 'items_this_page', 'prev_page_number', 'this_page_number',
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14 'next_page_number', 'prev_page', 'next_page',
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15 'total_item_count', 'total_page_count',
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16 'next_item', 'prev_item']
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17 debug_render_invoke = [
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18 '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, source, current_page, sub_num, *,
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25 pgn_filter=None, items_per_page=-1):
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26 self._source = source
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27 self._page = current_page
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28 self._sub_num = sub_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._items_per_page = items_per_page
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32 self._pgn_set_on_ctx = False
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33 self._is_content_source = isinstance(source, ContentSource)
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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.items_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
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91 if self._page is not None:
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92 ipp = self._page.config.get('items_per_page')
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93 if ipp is not None:
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94 return ipp
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95
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96 if self._is_content_source:
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97 ipp = self._source.config.get('items_per_page')
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98 if ipp is not None:
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99 return ipp
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100
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101 raise Exception("No way to figure out how many items to display "
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102 "per page.")
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103
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104 @property
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105 def items_this_page(self):
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106 self._load()
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107 return len(self._iterator)
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108
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109 @property
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110 def prev_page_number(self):
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111 if self._sub_num > 1:
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112 return self._sub_num - 1
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113 return None
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114
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115 @property
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116 def this_page_number(self):
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117 return self._sub_num
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118
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119 @property
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120 def next_page_number(self):
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121 self._load()
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122 if self._iterator._has_more:
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123 return self._sub_num + 1
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124 return None
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125
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126 @property
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127 def prev_page(self):
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128 num = self.prev_page_number
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129 if num is not None:
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130 return self._getPageUri(num)
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131 return None
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132
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133 @property
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134 def this_page(self):
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135 return self._getPageUri(self._sub_num)
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136
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137 @property
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138 def next_page(self):
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139 num = self.next_page_number
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140 if num is not None:
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141 return self._getPageUri(num)
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142 return None
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143
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144 @property
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145 def total_item_count(self):
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146 self._load()
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147 return self._iterator.total_count
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148
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149 @property
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150 def total_page_count(self):
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151 total_count = self.total_item_count
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152 per_page = self.items_per_page
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153 return int(math.ceil(total_count / per_page))
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154
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155 @property
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156 def next_item(self):
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157 self._load()
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158 return self._iterator.prev_page
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159
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160 @property
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161 def prev_item(self):
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162 self._load()
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163 return self._iterator.next_page
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164
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165 def all_page_numbers(self, radius=-1):
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166 total_page_count = self.total_page_count
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167 if total_page_count == 0:
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168 return []
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169
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170 if radius <= 0 or total_page_count < (2 * radius + 1):
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171 return list(range(1, total_page_count + 1))
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172
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173 first_num = self._sub_num - radius
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174 last_num = self._sub_num + radius
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175 if first_num <= 0:
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176 last_num += 1 - first_num
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177 first_num = 1
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178 elif last_num > total_page_count:
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179 first_num -= (last_num - total_page_count)
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180 last_num = total_page_count
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181 first_num = max(1, first_num)
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182 last_num = min(total_page_count, last_num)
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183 return list(range(first_num, last_num + 1))
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184
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185 def page(self, index):
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186 return self._getPageUri(index)
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187
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188 def _load(self):
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189 if self._iterator is not None:
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190 return
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191
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192 from piecrust.data.filters import PaginationFilter
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193 from piecrust.dataproviders.pageiterator import (
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194 PageIterator, HardCodedFilterIterator)
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195
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196 self._iterator = PageIterator(
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197 self._source,
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198 current_page=self._page)
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199
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200 if self._pgn_filter is not None:
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201 pag_fil = PaginationFilter()
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202 pag_fil.addClause(self._pgn_filter.root_clause)
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203 self._iterator._simpleNonSortedWrap(
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204 HardCodedFilterIterator, pag_fil)
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205
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206 offset = (self._sub_num - 1) * self.items_per_page
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207 limit = self.items_per_page
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208 self._iterator.slice(offset, limit)
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209
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210 if self._is_content_source:
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211 self._iterator._iter_event += self._onIteration
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212
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213 self._iterator._lockIterator()
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214
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215 def _getPageUri(self, index):
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216 return self._page.getUri(index)
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217
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218 def _onIteration(self, it):
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219 if not self._pgn_set_on_ctx:
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220 rcs = self._source.app.env.render_ctx_stack
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221 if rcs.current_ctx is not None:
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222 rcs.current_ctx.setPagination(self)
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223 self._pgn_set_on_ctx = True
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224