CheckBox not visible inside ComboBox

Question

I need my combobox items to be checkable by user so they can select multiple items. I've seen some solution on stackoverflow. I applied it to my code. It did something, but checkbox aren't visible yet and I'm not yet able to select any item.

My code is as follows

from PySide.QtGui import *
from PySide.QtCore import * 

udims = [here goes some items]
cmb = QComboBox()
model = QStandardItemModel(len(udims), 1)
for i, udim in enumerate(udims):
    item = QStandardItem(udim)
    item.setFlags(Qt.ItemIsUserCheckable | Qt.ItemIsEnabled)
    item.setData(Qt.Checked | Qt.CheckStateRole)
    model.setItem(i, 0, item)

cmb.setModel(model)

Answer 1

I was able to get this working by creating a subclass of QItemDelegate for the checkbox, then plugging that into the item delegate for the combobox.

from PySide.QtCore import *
from PySide.QtGui import *

class CheckBoxDelegate(QItemDelegate):
    def __init__(self, parent=None):
        super(CheckBoxDelegate, self).__init__(parent)

    def createEditor(parent, op, idx):
        self.editor = QCheckBox(parent)


udims = ['1001', '1002', '1003', '1004']
cmb = QComboBox()
delegate = CheckBoxDelegate()
cmb.setItemDelegate(delegate)
model = QStandardItemModel(len(udims), 1)
for i, udim in enumerate(udims):
    item = QStandardItem(udim)
    item.setFlags(Qt.ItemIsUserCheckable | Qt.ItemIsEnabled)
    item.setData(Qt.Checked | Qt.CheckStateRole)
    model.setItem(i, 0, item)

cmb.setModel(model)