PyQT: How to set Combobox Read-Only

Question

I know there is .setEnabled(bool) method available for Combobox widget. But aside from making it unavailable this method grays this widget out. What I need is to set Combobox so it appears an active but yet remains read only. Any ideas?

Answer 1

One way to do this would be to clobber the appropriate event handlers. This could be done with either a subclass:

class ComboBox(QtGui.QComboBox):
    def __init__(self, parent):
        QtGui.QComboBox.__init__(self, parent)
        self.readonly = False

    def mousePressEvent(self, event):
        if not self.readonly:
            QtGui.QComboBox.mousePressEvent(self, event)

    def keyPressEvent(self, event):
        if not self.readonly:
            QtGui.QComboBox.keyPressEvent(self, event)

    def wheelEvent(self, event):
        if not self.readonly():
            QtGui.QComboBox.wheelEvent(self, event)

or with an event-filter:

class Window(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self)  
        self.combo = QtGui.QComboBox(self)
        self.combo.readonly = False
        self.combo.installEventFilter(self)
        ...

    def eventFilter(self, source, event):
        if (source is self.combo and self.combo.readonly and (
            event.type() == QtCore.QEvent.MouseButtonPress or
            event.type() == QtCore.QEvent.KeyPress or
            event.type() == QtCore.QEvent.Wheel)):
            return True
        return QtGui.QWidget.eventFilter(self, source, event)

Personally, though, I would prefer to either disable the combo box, or perhaps reset its list of items so there was only one choice.