model/view QCompleter in a QLineEdit - model-view-controller

Question

ubuntu 10.04, KDE 4.4.5
python 2.6.4
qt 4.6.2
pyqt 4.6.2
I'm trying to create a QCompleter, which works fine if I just build the QLineEdit.
However if I drop the QLineEdit into a QMainWindow, the QCompleter no longer works.
Here is the LineEdit class
# LineEdit class
import sys
from PyQt4 import QtCore, QtGui
class LineEdit(QtGui.QLineEdit):
def __init__(self, parent=None):
super(LineEdit, self).__init__(parent)
self.setFocusPolicy(QtCore.Qt.StrongFocus)
self.completer = QtGui.QCompleter(self)
self.completer.setCompletionMode(QtGui.QCompleter.UnfilteredPopupCompletion)
self.pFilterModel = QtGui.QSortFilterProxyModel(self)
self.pFilterModel.setFilterCaseSensitivity(QtCore.Qt.CaseInsensitive)
self.completer.setPopup(self.view())
self.setCompleter(self.completer)
self.textEdited[unicode].connect(self.pFilterModel.setFilterFixedString)
def setModel(self, model):
self.pFilterModel.setSourceModel(model)
self.completer.setModel(self.pFilterModel)
def setModelColumn( self, column ):
self.completer.setCompletionColumn(column)
self.pFilterModel.setFilterKeyColumn(column)
def view(self):
return self.completer.popup()
def index( self ):
return self.currentIndex()
The QCompleter works if I build LinEdit this way
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
model = QtGui.QStandardItemModel()
for i,word in enumerate(['test', 'blah', 'heh', 'yep']):
item = QtGui.QStandardItem(word)
model.setItem(i, 0, item)
lineEdit = LineEdit()
lineEdit.setModel(model)
lineEdit.setModelColumn(0)
lineEdit.show()
sys.exit(app.exec_())
This compiles fine, but no longer shows the QCompleter
if __name__ == '__main__':
class Example(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.centralWidget = QtGui.QWidget(self)
self.layout = QtGui.QVBoxLayout(self.centralWidget)
# can I push this inside the LineEdit class instead?
model = QtGui.QStandardItemModel()
for i, word in enumerate(['test', 'blah', 'heh', 'yep', 'hello', 'hi']):
item = QtGui.QStandardItem(word)
model.setItem(i, 0, item)
# Make a LineEdit instance
self.lineEdit = LineEdit(parent=self.centralWidget)
self.lineEdit.setModel(model)
self.lineEdit.setModelColumn(0)
self.layout.addWidget(self.lineEdit)
self.setCentralWidget(self.centralWidget)
app = QtGui.QApplication(sys.argv)
QtWin = Example()
QtWin.show()
sys.exit(app.exec_())

Answer 1

turned out to be quite simple really, hopefully this will help anyone else using PyQt's QCompleter for auto-completion
import sys
from PyQt4 import QtCore, QtGui
class LineEdit(QtGui.QLineEdit):
def __init__(self, parent, completerContents):
super(LineEdit, self).__init__(parent)
self.completerList = QtCore.QStringList()
for content in completerContents:
self.completerList.append(QtCore.QString(content))
self.completer = QtGui.QCompleter(self.completerList, self)
self.completer.setCompletionMode(QtGui.QCompleter.PopupCompletion)
self.completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
self.setCompleter(self.completer)
if __name__ == '__main__':
class Example(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.centralWidget = QtGui.QWidget(self)
self.layout = QtGui.QVBoxLayout(self.centralWidget)
# Example LineEdit Call
self.lineEdit = LineEdit(parent=self.centralWidget, completerContents=('test', 'blah', 'heh', 'yep', 'hello', 'hi'))
self.layout.addWidget(self.lineEdit)
self.setCentralWidget(self.centralWidget)
app = QtGui.QApplication(sys.argv)
QtWin = Example()
QtWin.show()
sys.exit(app.exec_())

Answer 2

There is possible 2 reasons of such a behavior in the second case:
Your completer has no completion model in the second case
Your LineEdit has set other completer
Don't know if U can to debug this and set breakpoint on QLineEdit::setCompleter in python.