Quick function to make a QComboBox into a searchable list

searchable_combo_box.py

__author__ = "[email protected]"
__created__ = "2022-09-03"

"""
This is mostly a recreation of this stack overflow answer: https://stackoverflow.com/a/65408354
With some changes to make it callable after initialization.
"""

from PySide2 import QtCore, QtWidgets

def make_combo_box_searchable(combo_box):
    combo_box.setFocusPolicy(QtCore.Qt.StrongFocus)
    combo_box.setEditable(True)
    combo_box.setInsertPolicy(QtWidgets.QComboBox.NoInsert)

    filter_model = QtCore.QSortFilterProxyModel(combo_box)
    filter_model.setFilterCaseSensitivity(QtCore.Qt.CaseInsensitive)
    filter_model.setSourceModel(combo_box.model())

    completer = QtWidgets.QCompleter(filter_model, combo_box)
    completer.setCompletionMode(QtWidgets.QCompleter.UnfilteredPopupCompletion)
    combo_box.setCompleter(completer)
    combo_box.lineEdit().textEdited.connect(filter_model.setFilterFixedString)


# example/test window
if __name__ == "__main__":
    import sys
    import random
    app = QtWidgets.QApplication(sys.argv)
    
    example_texts = ["Pose_{}".format(i) for i in range(100)]
    for special_text in ["important item", "other important item", "very important item", "not that important", "something", "another thing in a list", "the most important"]:
        example_texts.insert(random.randint(0, len(example_texts)), special_text)

    example_combo_box = QtWidgets.QComboBox()
    example_combo_box.addItems(example_texts)
    
    make_combo_box_searchable(example_combo_box)
    
    window = QtWidgets.QWidget()
    window_layout = QtWidgets.QVBoxLayout()
    window_layout.addWidget(example_combo_box)
    window.setLayout(window_layout)
    window.show()

    app.exec_()