Connect double-click event of QListView with method in PyQt4

Question

I’ve got a PyQt QListView object, and I want a method to run when it is double-clicked. This should be trivial, but it doesn't seem to work. My code is as follows:

class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        lb = QListView()
        self.connect(lb, SIGNAL('doubleClicked()'), self.someMethod)

        grid = QGridLayout()
        grid.addWidget(lb, 0, 0)
        centralWidget.setLayout(grid)

    def someMethod(self):
        print "It happened!"

I’ve tried clicked() and entered() methods too, but they do not work either. These events are all listed in the documentation here.

Solution 1

It seems to work if:

self.connect(lb, SIGNAL('doubleClicked()'), self.someMethod)

Is replaced with the new syntax of:

lb.doubleClicked.connect(self.someMethod)

The latter is much more elegant too. I still do not know why the original syntax did not work, however.

Solution 2

It will also work if you use:

self.connect(lb,QtCore.SIGNAL("itemDoubleClicked (QListWidgetItem *)"),self.someMethod)

check the pyqt reference, then copy and paste the signal as is.

I know you already solved it. but I think knowing more than one method will be better.

Solution 3

itemDoubleClicked is a signal emitted by QListWidget and not QListView. I tested Moayyad Yaghi's suggestion and it did not work for me at least on Qt 4 with python 2.5

Though, lb.doubleClicked.connect(self.someMethod) works perfectly fine.

Comments

[Momo]

That doesn’t seem to work for me in pyqt4. I also tried self.connect(lb, SIGNAL('itemSelectionChanged()'), self.someMethod), but that doesn’t work either. It’s annoying, as I now want to use a keypressed signal, which doesn't seem to be available via lb.keyPressed.

[grego]

Looks like it comes from QAbstractItemView: doc.qt.io/qt-5/qabstractitemview.html#doubleClicked