Helpviewer/History/HistoryCompleter.py

Wed, 01 Jan 2014 14:40:41 +0100

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Wed, 01 Jan 2014 14:40:41 +0100
branch
5_3_x
changeset 3163
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parent 2302
f29e9405c851
permissions
-rw-r--r--

Updated copyright for 2014.

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1 # -*- coding: utf-8 -*-
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2
3163
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3 # Copyright (c) 2009 - 2014 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing a special completer for the history.
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8 """
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9
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10 from PyQt4.QtCore import Qt, QRegExp, QTimer
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11 from PyQt4.QtGui import QTableView, QAbstractItemView, QSortFilterProxyModel, \
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12 QCompleter
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13
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14 from .HistoryModel import HistoryModel
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15 from .HistoryFilterModel import HistoryFilterModel
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16
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17
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18 class HistoryCompletionView(QTableView):
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19 """
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20 Class implementing a special completer view for history based completions.
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21 """
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22 def __init__(self, parent=None):
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23 """
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24 Constructor
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25
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26 @param parent reference to the parent widget (QWidget)
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27 """
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28 super().__init__(parent)
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29
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30 self.horizontalHeader().hide()
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31 self.verticalHeader().hide()
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32
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33 self.setShowGrid(False)
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34
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35 self.setSelectionBehavior(QAbstractItemView.SelectRows)
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36 self.setSelectionMode(QAbstractItemView.SingleSelection)
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37 self.setTextElideMode(Qt.ElideRight)
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38
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39 metrics = self.fontMetrics()
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40 self.verticalHeader().setDefaultSectionSize(metrics.height())
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41
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42 def resizeEvent(self, evt):
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43 """
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44 Protected method handling resize events.
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45
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46 @param evt reference to the resize event (QResizeEvent)
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47 """
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48 self.horizontalHeader().resizeSection(0, 0.65 * self.width())
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49 self.horizontalHeader().setStretchLastSection(True)
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50
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51 super().resizeEvent(evt)
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52
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53 def sizeHintForRow(self, row):
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54 """
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55 Public method to give a size hint for rows.
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56
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57 @param row row number (integer)
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58 """
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59 metrics = self.fontMetrics()
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60 return metrics.height()
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61
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62
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63 class HistoryCompletionModel(QSortFilterProxyModel):
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64 """
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65 Class implementing a special model for history based completions.
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66 """
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67 HistoryCompletionRole = HistoryFilterModel.MaxRole + 1
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68
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69 def __init__(self, parent=None):
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70 """
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71 Constructor
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72
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73 @param parent reference to the parent object (QObject)
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74 """
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75 super().__init__(parent)
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76
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77 self.__searchString = ""
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78 self.__searchMatcher = QRegExp("", Qt.CaseInsensitive, QRegExp.FixedString)
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79 self.__wordMatcher = QRegExp("", Qt.CaseInsensitive)
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80 self.__isValid = False
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81
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82 self.setDynamicSortFilter(True)
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83
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84 def data(self, index, role=Qt.DisplayRole):
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85 """
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86 Public method to get data from the model.
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87
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88 @param index index of history entry to get data for (QModelIndex)
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89 @param role data role (integer)
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90 @return history entry data
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91 """
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92 # If the model is valid, tell QCompleter that everything we have filtered
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93 # matches what the user typed; if not, nothing matches
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94 if role == self.HistoryCompletionRole and index.isValid():
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95 if self.isValid():
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96 return "t"
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97 else:
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98 return "f"
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99
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100 if role == Qt.DisplayRole:
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101 if index.column() == 0:
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102 role = HistoryModel.UrlStringRole
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103 else:
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104 role = HistoryModel.TitleRole
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105
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106 return QSortFilterProxyModel.data(self, index, role)
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107
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108 def searchString(self):
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109 """
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110 Public method to get the current search string.
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111
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112 @return current search string (string)
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113 """
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114 return self.__searchString
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115
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116 def setSearchString(self, string):
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117 """
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118 Public method to set the current search string.
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119
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120 @param string new search string (string)
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121 """
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122 if string == self.__searchString:
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123 return
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124
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125 self.__searchString = string
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126 self.__searchMatcher.setPattern(self.__searchString)
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127 self.__wordMatcher.setPattern("\\b" + QRegExp.escape(self.__searchString))
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128 self.invalidateFilter()
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129
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130 def isValid(self):
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131 """
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132 Public method to check the model for validity.
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diff changeset
133
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134 @param flag indicating a valid status (boolean)
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135 """
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parents:
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136 return self.__isValid
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137
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138 def setValid(self, valid):
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139 """
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parents:
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140 Public method to set the model's validity.
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141
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142 @param valid flag indicating the new valid status (boolean)
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143 """
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144 if valid == self.__isValid:
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145 return
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146
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147 self.__isValid = valid
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148
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149 # tell the history completer that the model has changed
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150 self.dataChanged.emit(self.index(0, 0), self.index(0, self.rowCount() - 1))
0
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151
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152 def filterAcceptsRow(self, sourceRow, sourceParent):
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153 """
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154 Protected method to determine, if the row is acceptable.
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155
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156 @param sourceRow row number in the source model (integer)
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157 @param sourceParent index of the source item (QModelIndex)
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158 @return flag indicating acceptance (boolean)
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159 """
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160 # Do a case-insensitive substring match against both the url and title.
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161 # It's already ensured, that the user doesn't accidentally use regexp
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162 # metacharacters (s. setSearchString()).
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163 idx = self.sourceModel().index(sourceRow, 0, sourceParent)
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164
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165 url = self.sourceModel().data(idx, HistoryModel.UrlStringRole)
0
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166 if self.__searchMatcher.indexIn(url) != -1:
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167 return True
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168
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169 title = self.sourceModel().data(idx, HistoryModel.TitleRole)
0
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170 if self.__searchMatcher.indexIn(title) != -1:
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171 return True
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172
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173 return False
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174
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175 def lessThan(self, left, right):
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176 """
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177 Protected method used to sort the displayed items.
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178
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179 It implements a special sorting function based on the history entry's
0
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180 frequency giving a bonus to hits that match on a word boundary so that
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181 e.g. "dot.python-projects.org" is a better result for typing "dot" than
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182 "slashdot.org". However, it only looks for the string in the host name,
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183 not the entire URL, since while it makes sense to e.g. give
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184 "www.phoronix.com" a bonus for "ph", it does NOT make sense to give
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185 "www.yadda.com/foo.php" the bonus.
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186
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187 @param left index of left item (QModelIndex)
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188 @param right index of right item (QModelIndex)
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189 @return true, if left is less than right (boolean)
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190 """
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191 frequency_L = \
7
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192 self.sourceModel().data(left, HistoryFilterModel.FrequencyRole)
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193 url_L = self.sourceModel().data(left, HistoryModel.UrlRole).host()
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194 title_L = self.sourceModel().data(left, HistoryModel.TitleRole)
0
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195
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196 if self.__wordMatcher.indexIn(url_L) != -1 or \
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197 self.__wordMatcher.indexIn(title_L) != -1:
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198 frequency_L *= 2
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199
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200 frequency_R = \
7
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diff changeset
201 self.sourceModel().data(right, HistoryFilterModel.FrequencyRole)
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diff changeset
202 url_R = self.sourceModel().data(right, HistoryModel.UrlRole).host()
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parents: 0
diff changeset
203 title_R = self.sourceModel().data(right, HistoryModel.TitleRole)
0
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204
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diff changeset
205 if self.__wordMatcher.indexIn(url_R) != -1 or \
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diff changeset
206 self.__wordMatcher.indexIn(title_R) != -1:
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diff changeset
207 frequency_R *= 2
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208
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diff changeset
209 # Sort results in descending frequency-derived score.
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diff changeset
210 return frequency_R < frequency_L
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diff changeset
211
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parents: 791
diff changeset
212
0
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diff changeset
213 class HistoryCompleter(QCompleter):
945
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214 def __init__(self, model, parent=None):
0
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215 """
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parents:
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216 Constructor
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217
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218 @param model reference to the model (QAbstractItemModel)
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219 @param parent reference to the parent object (QObject)
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220 """
1131
7781e396c903 Changed the code to use super() to access the superclass.
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diff changeset
221 super().__init__(model, parent)
0
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222
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223 self.setPopup(HistoryCompletionView())
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parents:
diff changeset
224
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diff changeset
225 # Completion should be against the faked role.
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parents:
diff changeset
226 self.setCompletionRole(HistoryCompletionModel.HistoryCompletionRole)
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227
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diff changeset
228 # Since the completion role is faked, advantage of the sorted-model
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diff changeset
229 # optimizations in QCompleter can be taken.
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diff changeset
230 self.setCaseSensitivity(Qt.CaseSensitive)
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parents:
diff changeset
231 self.setModelSorting(QCompleter.CaseSensitivelySortedModel)
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232
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diff changeset
233 self.__searchString = ""
323
75182cd9b2c5 Some small tweaks.
Detlev Offenbach <detlev@die-offenbachs.de>
parents: 13
diff changeset
234 self.__filterTimer = QTimer(self)
0
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diff changeset
235 self.__filterTimer.setSingleShot(True)
488
4174c2707dba Continued porting signal/slot usage to the new API.
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diff changeset
236 self.__filterTimer.timeout.connect(self.__updateFilter)
0
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237
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238 def pathFromIndex(self, idx):
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239 """
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240 Public method to get a path for a given index.
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241
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diff changeset
242 @param idx reference to the index (QModelIndex)
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243 @return the actual URL from the history (string)
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244 """
7
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245 return self.model().data(idx, HistoryModel.UrlStringRole)
0
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246
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247 def splitPath(self, path):
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248 """
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diff changeset
249 Public method to split the given path into strings, that are used to match
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parents:
diff changeset
250 at each level in the model.
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diff changeset
251
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diff changeset
252 @param path path to be split (string)
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diff changeset
253 @return list of path elements (list of strings)
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254 """
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parents:
diff changeset
255 if path == self.__searchString:
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parents:
diff changeset
256 return ["t"]
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257
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diff changeset
258 # Queue an update to the search string. Wait a bit, so that if the user
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diff changeset
259 # is quickly typing, the completer doesn't try to complete until they pause.
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diff changeset
260 if self.__filterTimer.isActive():
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diff changeset
261 self.__filterTimer.stop()
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262 self.__filterTimer.start(150)
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263
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264 # If the previous search results are not a superset of the current
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265 # search results, tell the model that it is not valid yet.
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266 if not path.startswith(self.__searchString):
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267 self.model().setValid(False)
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268
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269 self.__searchString = path
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270
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271 # The actual filtering is done by the HistoryCompletionModel. Just
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272 # return a short dummy here so that QCompleter thinks everything matched.
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273 return ["t"]
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274
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275 def __updateFilter(self):
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276 """
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277 Private slot to update the search string.
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278 """
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279 completionModel = self.model()
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280
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281 # Tell the HistoryCompletionModel about the new search string.
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282 completionModel.setSearchString(self.__searchString)
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283
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284 # Sort the model.
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285 completionModel.sort(0)
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286
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287 # Mark it valid.
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288 completionModel.setValid(True)
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289
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290 # Now update the QCompleter widget, but only if the user is still typing a URL.
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291 if self.widget() is not None and self.widget().hasFocus():
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292 self.complete()

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