Preventing QComboboxView from autocollapsing when clicking on QTreeView item

Question

I'm using python3 + PyQt5. In my program I have QCombobox and a QTreeView inside that combobox. The QCOmbobox default behavior is to hide the dropdown list when an item is clicked. However, in my case there is not a simple list inside it, but a TreeView. So when I'm clicking an Expand Arrow in it, QCombobox hides the view so I can not select an item

I have no any specific code here, just widget initialization. I know that there are signals and slots so my guess here is that combobox catches the item click event and wraps it in its own behavior. So I think I need to override some method but I'm not sure which exactly.

According to the image you show, you only want the popup to close if you click on the item child2, or rather those items that do not have children. I am right? — eyllanesc, Apr 25 '18 at 10:31
@eyllanesc that's right. but the popup closes automatically even if I click just arrow — Sergey Maslov, Apr 25 '18 at 10:32

score 1 · Accepted Answer · answered Apr 25 '18 at 11:06

You must disable the item being selectable to the items that you do not want to be set in the QComboBox, for example:

import sys

from PyQt5 import QtWidgets, QtGui


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = QtWidgets.QComboBox()
    model = QtGui.QStandardItemModel()
    for i in range(3):
        parent = model
        for j in range(3):
            it = QtGui.QStandardItem("parent {}-{}".format(i, j))
            if j != 2:
                it.setSelectable(False)
            parent.appendRow(it)
            parent = it
    w.setModel(model)

    view = QtWidgets.QTreeView()
    w.setView(view)
    w.show()
    sys.exit(app.exec_())

A more elegant solution is to overwrite the flags of the model:

import sys

from PyQt5 import QtWidgets, QtGui, QtCore

class StandardItemModel(QtGui.QStandardItemModel):
    def flags(self, index):
        fl = QtGui.QStandardItemModel.flags(self, index)
        if self.hasChildren(index):
            fl &= ~QtCore.Qt.ItemIsSelectable
        return fl

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = QtWidgets.QComboBox()
    model = StandardItemModel()
    for i in range(3):
        parent = model
        for j in range(3):
            it = QtGui.QStandardItem("parent {}-{}".format(i, j))
            parent.appendRow(it)
            parent = it
    w.setModel(model)
    view = QtWidgets.QTreeView()
    w.setView(view)
    w.show()
    sys.exit(app.exec_())

your solution is great, but it does not allow to choose parent items. I want to be able to choose parent items, my problem is that when I click an arrow to expand a parent it gets selected — Sergey Maslov, Apr 25 '18 at 12:28
@SergeyMaslov You have to be clear, so I ask you the question and point out that if you wanted the items that do not have children are only selectable and you said yes. — eyllanesc, Apr 25 '18 at 12:30
I'm sorry for this misunderstanding. I got your question wrong — Sergey Maslov, Apr 25 '18 at 12:32
@SergeyMaslov you should indicate that it is not selectable only when the arrow is pressed. — eyllanesc, Apr 25 '18 at 12:34
yes. I need to be able to select both parent and child but not when I click the arrow. And the tricky thing here is to override arrow clicking method — Sergey Maslov, Apr 25 '18 at 12:36

Preventing QComboboxView from autocollapsing when clicking on QTreeView item

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