qt - How to implement a tree-based QComboBox -

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how can implement qcombobox allows choose tree structure, akin qtreeview?

i came following class (treecombobox) using two-part recipe @ developer.nokia.com (part 1, part 2):

from pyqt5.qtcore import * pyqt5.qtwidgets import * pyqt5.qtgui import *   class treecombobox(qcombobox):     def __init__(self, *args):         super().__init__(*args)          self.__skip_next_hide = false          tree_view = qtreeview(self)         tree_view.setframeshape(qframe.noframe)         tree_view.setedittriggers(tree_view.noedittriggers)         tree_view.setalternatingrowcolors(true)         tree_view.setselectionbehavior(tree_view.selectrows)         tree_view.setwordwrap(true)         tree_view.setallcolumnsshowfocus(true)         self.setview(tree_view)          self.view().viewport().installeventfilter(self)      def showpopup(self):         self.setrootmodelindex(qmodelindex())         super().showpopup()      def hidepopup(self):         self.setrootmodelindex(self.view().currentindex().parent())         self.setcurrentindex(self.view().currentindex().row())         if self.__skip_next_hide:             self.__skip_next_hide = false         else:             super().hidepopup()      def selectindex(self, index):         self.setrootmodelindex(index.parent())         self.setcurrentindex(index.row())      def eventfilter(self, object, event):         if event.type() == qevent.mousebuttonpress , object self.view().viewport():             index = self.view().indexat(event.pos())             self.__skip_next_hide = not self.view().visualrect(index).contains(event.pos())         return false   app = qapplication([])  combo = treecombobox() combo.resize(200, 30)  parent_item = qstandarditem('item 1') parent_item.appendrow([qstandarditem('child'), qstandarditem('yesterday')]) model = qstandarditemmodel() model.appendrow([parent_item, qstandarditem('today')]) model.appendrow([qstandarditem('item 2'), qstandarditem('today')]) model.setheaderdata(0, qt.horizontal, 'name', qt.displayrole) model.setheaderdata(1, qt.horizontal, 'date', qt.displayrole) combo.setmodel(model)  combo.show() app.exec_()

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