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POHow to optimize PyQt QSortFilterProxyModel filter reimplementation?
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copied!<p>I have a reimplemented QSortFilterProxyModel acceptRows to achieve custom behavior, i want it to not filter out items which have a valid child.</p> <pre><code>class KSortFilterProxyModel(QSortFilterProxyModel): #FIXME: Funciona pero es endemoniadamente lento def __init__(self, parent=None): super(KSortFilterProxyModel, self).__init__(parent) self.__showAllChildren = False def showAllChildren(self): return self.__showAllChildren; def setShowAllChildren(self, showAllChildren): if showAllChildren == self.__showAllChildren: return self.__showAllChildren = showAllChildren self.invalidateFilter() def filterAcceptsRow (self, source_row, source_parent ): if self.filterRegExp() == "" : return True #Shortcut for common case if super(KSortFilterProxyModel, self).filterAcceptsRow( source_row, source_parent) : return True #one of our children might be accepted, so accept this row if one of our children are accepted. source_index = self.sourceModel().index(source_row, 0, source_parent) for i in range( self.sourceModel().rowCount(source_index)): if self.filterAcceptsRow(i, source_index): return True return False </code></pre> <p>However this aproach doesn't seems to be efficient because with 300 items it takes almost 3 seconds to update the view, i want to know if theres a better way of doing it.</p> <p>PD: This class is basically a translation of a KSysGuard one i found in <a href="http://websvn.kde.org/trunk/KDE/kdebase/workspace/ksysguard/gui/ksortfilterproxymodel.h?view=log" rel="nofollow noreferrer">KDE websvn</a></p>

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