def parent(self, index):
'''Return parent of *index*.'''
if not index.isValid():
return QtCore.QModelIndex()
item = index.internalPointer()
if not item:
return QtCore.QModelIndex()
parent = item.parent
if not parent or parent == self.root:
return QtCore.QModelIndex()
return self.createIndex(parent.row, 0, parent)
def index(self, row, column, parent=None):
'''Return index for *row* and *column* under *parent*.'''
if parent is None:
parent = QtCore.QModelIndex()
if not self.hasIndex(row, column, parent):
return QtCore.QModelIndex()
if not parent.isValid():
item = self.root
else:
item = parent.internalPointer()
try:
child = item.children[row]
except IndexError:
return QtCore.QModelIndex()
else:
return self.createIndex(row, column, child)
def setLocationFromIndex(self, index):
'''Set location to *index*.'''
if index is None:
index = QtCore.QModelIndex()
currentIndex = self.view.rootIndex()
if index == currentIndex:
return
self.view.setRootIndex(index)
self._updateNavigationBar()
selectionModel = self.view.selectionModel()
selectionModel.clearSelection()
self.locationChanged.emit()
