Getting proper root index for QTreeView with QSortFilterProxyModel

[JediAce]

Hi Everyone

So I'm trying to filter a QFileSystemModel using QSortFilterProxyModel and displaying it with QTreeView. The filtering works fine, however, I'm having trouble setting the root index to the folder I want. To set the root index for QTreeView, I use:

someTreeView.setRootIndex( someFilterProxyModel.mapFromSource(indexFromSource ))

after some debugging I realized that the index outputted by

someFIlterProxyModel.mapFromSource(indexFromSource ) is invalid. Here is some sample code:

154         # Add file browser 
155         model = QFileSystemModel() 
156         testDir = QString(dir) 
157         model.setRootPath(testDir) 
158         self._fsModel = model 
159         self._treeView = QTreeView() 
160 
161         if self.selectedFileFilter == 'All Files': 
162             self._treeView.setModel(model) 
163             self._treeView.setRootIndex(model.index(testDir)) 
164         else: 
165             filteredModel = FileSystemFilter() 
166             filteredModel.setSourceModel(self._fsModel) 
167             ext = self.selectedFileFilter.split(' ')[0] 
168             pattern = '*' + ext 
169             print 'pattern: %s' % pattern 
171             filteredModel.setFilterWildcard(QString('*.spy')) 
172             filteredModel.setDynamicSortFilter(True) 
175             self._treeView.setModel(filteredModel) 
176             print 'model index is valid: %s' % model.index(testDir).isValid() 
177             print 'proxy index is valid: %s' % filteredModel.mapFromSource(model.index(testDir)).isValid() 
179             self._treeView.setRootIndex(filteredModel.mapFromSource(model.index(testDir)))

154         # Add file browser 
155         model = QFileSystemModel() 
156         testDir = QString(dir) 
157         model.setRootPath(testDir) 
158         self._fsModel = model 
159         self._treeView = QTreeView() 
160 
161         if self.selectedFileFilter == 'All Files': 
162             self._treeView.setModel(model) 
163             self._treeView.setRootIndex(model.index(testDir)) 
164         else: 
165             filteredModel = FileSystemFilter() 
166             filteredModel.setSourceModel(self._fsModel) 
167             ext = self.selectedFileFilter.split(' ')[0] 
168             pattern = '*' + ext 
169             print 'pattern: %s' % pattern 
171             filteredModel.setFilterWildcard(QString('*.spy')) 
172             filteredModel.setDynamicSortFilter(True) 
175             self._treeView.setModel(filteredModel) 
176             print 'model index is valid: %s' % model.index(testDir).isValid() 
177             print 'proxy index is valid: %s' % filteredModel.mapFromSource(model.index(testDir)).isValid() 
179             self._treeView.setRootIndex(filteredModel.mapFromSource(model.index(testDir)))

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Sorry the lines are off. I deleted some comments. Does anyone know why this is happening? Is this a known bug? Is there any other way to get the root index from my source model? Thanks.

[wysota]

QFileSystemModel initializes itself in the background so it may take a while until a specified index is valid. Instead you should just set the root path of the model to the path you expect to have as a root index of the view. Unfortunately you won't be able to go up the directory structure then. Another solution is to wait until the model gets initialized or use QDirModel.