[FIXED] PySide: How to overload classes with static functions

Issue

I want to overload QInputDialog because I want to replace its QCombobox with my own QCombobox derivative. I checked the source-code of QInputDialog and tried to overload its ensureCombobox(). However, when I try something like:

class AutoCompleteInputDialog(QtGui.QInputDialog):

    def __init__(self, *args, **kwargs):
        self.ensureComboBox()
        super(AutoCompleteInputDialog, self).__init__(*args, **kwargs)


    def ensureComboBox(self):
        print "ensureComboBox"
        self.comboBox = AutoCompleteComboBox(self)
        self.comboBox.hide()

        self.comboBox.editTextChanged.connect(self.textChanged)
        self.comboBox.currentIndexChanged.connect(self.textChanged)

AutoCompleteInputDialog.getItems(None, "test title", "test label", ["albatross 12", "tiger 12", "item 2", "item 3"])

ensureCombobox is never called.

I tried also to define a static method that creates a QInputDialog and sets its combobox. But it does not work either.

    @staticmethod
    def getItem(*args, **kwargs):
        dialog = QtGui.QInputDialog()
        dialog.comboBox = AutoCompleteComboBox(dialog)
        return dialog.getItem(*args, **kwargs)

For completeness, the code of AutoCompleteCombobox

class AutoCompleteComboBox(QtGui.QComboBox):
    def __init__(self, *args, **kwargs):
        super(AutoCompleteComboBox, self).__init__(*args, **kwargs)

        self.setEditable(True)
        self.setInsertPolicy(self.NoInsert)

        # self.comp = QtGui.QCompleter([""], self)
        self.comp = CustomQCompleter([""], self)
        self.comp.setCompletionMode(QtGui.QCompleter.PopupCompletion)
        self.comp.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
        self.setCompleter(self.comp)#
        self.setModel(["hallo babe", "world", "we", "are babe"])

    def setModel(self, strList):
        # self.comp.model().setStringList(strList)
        self.clear()
        self.insertItems(0, strList)
        self.comp.setModel(self.model())

    def focusInEvent(self, event):
        self.clearEditText()
        super(AutoCompleteComboBox, self).focusInEvent(event)

class CustomQCompleter(QtGui.QCompleter):
    """
    copied from: http://stackoverflow.com/a/7767999/2156909
    """
    def __init__(self, *args):#parent=None):
        super(CustomQCompleter, self).__init__(*args)
        self.local_completion_prefix = ""
        self.source_model = None

    def setModel(self, model):
        self.source_model = model
        super(CustomQCompleter, self).setModel(self.source_model)

    def updateModel(self):
        local_completion_prefix = self.local_completion_prefix
        class InnerProxyModel(QtGui.QSortFilterProxyModel):
            def filterAcceptsRow(self, sourceRow, sourceParent):
                index0 = self.sourceModel().index(sourceRow, 0, sourceParent)
                return local_completion_prefix.lower() in self.sourceModel().data(index0).lower()
        proxy_model = InnerProxyModel()
        proxy_model.setSourceModel(self.source_model)
        super(CustomQCompleter, self).setModel(proxy_model)

    def splitPath(self, path):
        self.local_completion_prefix = path
        self.updateModel()
        return ""

Solution

OK, so the problem is that when you call QInputDialog, it sets up the sub-widgets in C++-land (or so it appears to me), so you cannot directly substitute in your favourite flavour. Therefore you need to go down the more typical route as shown:

class AutoCompleteInputDialog(QtGui.QDialog):

    def __init__(self, *args, **kwargs):
        super(AutoCompleteInputDialog, self).__init__(*args, **kwargs)
        self.comboBox = AutoCompleteComboBox(self)
        self.va = QtGui.QVBoxLayout(self)
        self.va.addWidget(self.comboBox)
        self.box = QtGui.QWidget(self)
        self.ha = QtGui.QHBoxLayout(self)
        self.va.addWidget(self.box)
        self.box.setLayout(self.ha)
        self.OK = QtGui.QPushButton("OK",self)
        self.OK.setDefault(True)
        self.cancel = QtGui.QPushButton("Cancel",self)
        self.ha.addWidget(self.OK)
        self.ha.addWidget(self.cancel)
        self.OK.clicked.connect(self.accept)
        self.cancel.clicked.connect(self.reject)

The resultant value is stored in acid.comboBox.currentText().

Answered By - mdurant