SqlBrowser/SqlConnectionWidget.py

Sat, 05 Jul 2014 11:41:14 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sat, 05 Jul 2014 11:41:14 +0200
changeset 3669
ac84ac3c0f05
parent 3656
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child 4021
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permissions
-rw-r--r--

Continued renaming eric5 for PyQt5 to eric6.

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1 # -*- coding: utf-8 -*-
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2
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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 widget showing the SQL connections.
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8 """
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9
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10 from __future__ import unicode_literals
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11
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12 from PyQt5.QtCore import pyqtSignal, Qt, qVersion
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13 from PyQt5.QtWidgets import QWidget, QHeaderView, QTreeWidget, QVBoxLayout, \
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14 QTreeWidgetItem, QAction
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15 from PyQt5.QtSql import QSqlDatabase
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16
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17
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18 class SqlConnectionWidget(QWidget):
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19 """
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20 Class implementing a widget showing the SQL connections.
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21
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22 @signal tableActivated(str) emitted after the entry for a table has been
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23 activated
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24 @signal schemaRequested(str) emitted when the schema display is requested
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25 @signal cleared() emitted after the connection tree has been cleared
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26 """
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27 tableActivated = pyqtSignal(str)
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28 schemaRequested = pyqtSignal(str)
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29 cleared = pyqtSignal()
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30
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31 def __init__(self, parent=None):
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32 """
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33 Constructor
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34
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35 @param parent reference to the parent widget (QWidget)
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36 """
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37 super(SqlConnectionWidget, self).__init__(parent)
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38
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39 layout = QVBoxLayout(self)
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40 layout.setContentsMargins(0, 0, 0, 0)
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41
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42 self.__connectionTree = QTreeWidget(self)
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43 self.__connectionTree.setObjectName("connectionTree")
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44 self.__connectionTree.setHeaderLabels([self.tr("Database")])
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45 if qVersion() >= "5.0.0":
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46 self.__connectionTree.header().setSectionResizeMode(
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47 QHeaderView.Stretch)
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48 else:
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49 self.__connectionTree.header().setResizeMode(QHeaderView.Stretch)
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50 refreshAction = QAction(self.tr("Refresh"), self.__connectionTree)
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51 self.__schemaAction = QAction(
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52 self.tr("Show Schema"), self.__connectionTree)
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53
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54 refreshAction.triggered.connect(self.refresh)
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55 self.__schemaAction.triggered.connect(self.showSchema)
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56
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57 self.__connectionTree.addAction(refreshAction)
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58 self.__connectionTree.addAction(self.__schemaAction)
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59 self.__connectionTree.setContextMenuPolicy(Qt.ActionsContextMenu)
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60
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61 layout.addWidget(self.__connectionTree)
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62
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63 self.__activating = False
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64
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65 self.__connectionTree.itemActivated.connect(self.__itemActivated)
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66 self.__connectionTree.currentItemChanged.connect(
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67 self.__currentItemChanged)
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68
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69 self.__activeDb = ""
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70
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71 def refresh(self):
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72 """
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73 Public slot to refresh the connection tree.
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74 """
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75 self.__connectionTree.clear()
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76 self.cleared.emit()
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77
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78 connectionNames = QSqlDatabase.connectionNames()
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79
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80 foundActiveDb = False
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81 for name in connectionNames:
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82 root = QTreeWidgetItem(self.__connectionTree)
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83 db = QSqlDatabase.database(name, False)
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84 root.setText(0, self.__dbCaption(db))
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85 if name == self.__activeDb:
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86 foundActiveDb = True
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87 self.__setActive(root)
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88 if db.isOpen():
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89 tables = db.tables()
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90 for table in tables:
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91 itm = QTreeWidgetItem(root)
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92 itm.setText(0, table)
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93
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94 if not foundActiveDb and connectionNames:
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95 self.__activeDb = connectionNames[0]
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96 self.__setActive(self.__connectionTree.topLevelItem(0))
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97
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98 def showSchema(self):
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99 """
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100 Public slot to show schema data of a database.
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101 """
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102 cItm = self.__connectionTree.currentItem()
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103 if cItm is None or cItm.parent() is None:
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104 return
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105 self.__setActive(cItm.parent())
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106 self.schemaRequested.emit(cItm.text(0))
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107
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108 def __itemActivated(self, itm, column):
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109 """
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110 Private slot handling the activation of an item.
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111
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112 @param itm reference to the item (QTreeWidgetItem)
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113 @param column column that was activated (integer)
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114 """
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115 if itm is None:
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116 return
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117
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118 if not self.__activating:
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119 self.__activating = True
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120 if itm.parent() is None:
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121 self.__setActive(itm)
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122 else:
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123 self.__setActive(itm.parent())
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124 self.tableActivated.emit(itm.text(0))
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125 self.__activating = False
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126
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127 def __currentItemChanged(self, current, previous):
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128 """
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129 Private slot handling a change of the current item.
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130
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131 @param current reference to the new current item (QTreeWidgetItem)
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132 @param previous reference to the previous current item
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133 (QTreeWidgetItem)
0
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134 """
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135 self.__schemaAction.setEnabled(
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136 current is not None and current.parent() is not None)
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137
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138 def __dbCaption(self, db):
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139 """
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140 Private method to assemble a string for the caption.
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141
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142 @param db reference to the database object (QSqlDatabase)
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143 @return caption string (string)
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144 """
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145 nm = db.driverName()
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146 nm += ":"
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147 if db.userName():
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148 nm += db.userName()
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149 nm += "@"
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150 nm += db.databaseName()
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151 return nm
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152
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153 def __setBold(self, itm, bold):
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154 """
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155 Private slot to set the font to bold.
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156
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157 @param itm reference to the item to be changed (QTreeWidgetItem)
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158 @param bold flag indicating bold (boolean)
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159 """
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160 font = itm.font(0)
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161 font.setBold(bold)
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162 itm.setFont(0, font)
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163
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164 def currentDatabase(self):
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165 """
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166 Public method to get the current database.
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167
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168 @return reference to the current database (QSqlDatabase)
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169 """
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170 return QSqlDatabase.database(self.__activeDb)
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171
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172 def __setActive(self, itm):
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173 """
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174 Private slot to set an item to active.
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175
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176 @param itm reference to the item to set as the active item
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177 (QTreeWidgetItem)
0
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178 """
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179 for index in range(self.__connectionTree.topLevelItemCount()):
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180 if self.__connectionTree.topLevelItem(index).font(0).bold():
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181 self.__setBold(
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182 self.__connectionTree.topLevelItem(index), False)
0
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183
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184 if itm is None:
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185 return
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186
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187 self.__setBold(itm, True)
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188 self.__activeDb = QSqlDatabase.connectionNames()[
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189 self.__connectionTree.indexOfTopLevelItem(itm)]

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