CODEWITHSUNDEEP
pythonuser-interfacepyqt4
PYPL
PYPL

Reputation: 1859

PyQT: Calling my own method when list item is changed

I'm trying to make list2 to clear whatever it holds in it and assign to it a new value, but I'm getting an error when trying to use my own method fillListView instead of built in functions like self.list2.clear. How can I avoid it and make it work as expected?

class Ui(object):
    def setupUi(self, Ui):
        self.List1= QtGui.QListWidget(self.ProjectNavigator)
        self.List1.setGeometry(QtCore.QRect(10, 50, 141, 241))
        self.List1.setObjectName(_fromUtf8("List1"))
        self.List2 = QtGui.QListWidget(self.ProjectNavigator)
        self.List2.setGeometry(QtCore.QRect(170, 50, 141, 241))
        self.List2.setObjectName(_fromUtf8("List2"))

        ### QtCore.QObject.connect(self.ProjectType, QtCore.SIGNAL(_fromUtf8("itemSelectionChanged()")), self.List2.clear) This one works but it's only clear the list
        QtCore.QObject.connect(self.ProjectType, QtCore.SIGNAL(_fromUtf8("itemSelectionChanged()")), self.fillListView())

and here is my method:

def fillListView(self):
   self.List2.clear,
   self.List2.addItem("TEST1")
   self.List2.addItem("TEST2")

traceback:

TypeError: arguments did not match any overloaded call:
  QObject.connect(QObject, SIGNAL(), QObject, SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'NoneType'
  QObject.connect(QObject, SIGNAL(), callable, Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'NoneType'
  QObject.connect(QObject, SIGNAL(), SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 2 has unexpected type 'str'

Upvotes: 0

Views: 370

Answers (1)

derricw
derricw

Reputation: 7036

Your problem is that when you connect your signal with:

QtCore.QObject.connect(self.ProjectType, QtCore.SIGNAL(_fromUtf8("itemSelectionChanged()")), self.fillListView())

You are passing the return value of self.fillListView(), which is None, instead of the function itself.

Try:

QtCore.QObject.connect(self.ProjectType, QtCore.SIGNAL(_fromUtf8("itemSelectionChanged()")), self.fillListView)

Also, in your fillListView() method, you might want to actually run the clear method with:

self.list2.clear()  # note the parethesis

Also, as the other commentor said, you should decide if you want to call it self.list2 or self.List2. I would suggest lower case.

Upvotes: 1

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