pyqt pass focus to delegate editor - delegates

Question

My QStyledItemDelegate uses a QDialog (Qt.Popup) to display a QLineEdit and a QListWidget. I'm failing to have the focus set properly on the QLineEdit. The focus seems to remain on the QTreeView from which the editing began.
I've tried,
-setFocus() and setFocusPolicy(Qt.StrongFocus) on the QDialog editor and the QLineEdit within
-activateWindow() on the editor (although the pop is already on top)
my QDialog and QLineEdit subclasses:
class ValidatedLineEdit(QLineEdit):
def __init__(self, list_widget, parent=None):
QLineEdit.__init__(self, parent)
self._listW = list_widget
self._parent = parent
self.setFocusPolicy(Qt.StrongFocus)
self.setFocus()
self.activateWindow()
validator = QRegExpValidator(QRegExp("[\w\*]*"), self)
self.setValidator(validator)
def keyReleaseEvent(self, event):
'''
#param event QKeyEvent
'''
self._listW.clear()
text = self.text()
reg_exp = QRegExp(text.replace('*', '.*'))
self._listW.addItems(QStringList([a for a in self._parent._elementList if reg_exp.exactMatch(a)]))
return super(ValidatedLineEdit, self).keyReleaseEvent(event)
class ValidatedFilterListDialog(QDialog):
def __init__(self, element_list=[], window_flag=Qt.Popup, parent=None):
QDialog.__init__(self, parent, window_flag)
self._elementList = element_list
layout = QVBoxLayout(self)
self._listW = QListWidget(self)
self._lineE = ValidatedLineEdit(self._listW, parent=self)
self._lineE.setFocus()
self._listW.addItems(QStringList(sorted(self._elementList)))
layout.addWidget(self._lineE)
layout.addWidget(self._listW)
#property
def value(self):
return self._lineE.text()
#property
def line_edit(self):
return self._lineE
#property
def list_widget(self):
return self._listW
My delegate class,
class AddValidatedFilterDelegate(QStyledItemDelegate):
'''
A custom validator for the include/exclude items.
'''
def __init__(self, parent=None):
QStyledItemDelegate.__init__(self, parent)
self._parent = parent
def createEditor(self, parent, option, index):
'''
#param parent QWidget
#param option QStyleOptionViewItem
#param index QModelIndex
'''
if not index.isValid():
return 0
if index.column() == 0: #only on the cells in the first column
editor = generic.ValidatedFilterListDialog(element_list=sorted(index.model()._parent._elementList), parent=parent)
editor.setFocusPolicy(Qt.StrongFocus)
editor.activateWindow()
editor.line_edit.setFocus()
return editor
return super(AddValidatedFilterDelegate, self).createEditor(parent, option, index)
def sizeHint(self, option, index):
text = index.model().data(index)
document = QTextDocument()
document.setDefaultFont(option.font)
document.setHtml(text)
return QSize(document.idealWidth() + 5,
option.fontMetrics.height())
def setEditorData(self, editor, index):
value = index.model().data(index, Qt.DisplayRole)
editor.line_edit.setText(value)
editor.line_edit.setFocus()
def setModelData(self, editor, model, index):
model.setData(index, QVariant(editor.value))
def updateEditorGeometry(self, editor, option, index):
top_left = self._parent.mapToGlobal(self._parent.rect().topLeft())
x = top_left.x()
y = top_left.y() + editor.rect().y()
w = self._parent.width()
editor.setGeometry(x, y, w, 400)
Anything stick out??