PyQt5 - 获取 ComboBox 的根模型索引

在本文中，我们将了解如何获取组合框的根模型索引。根模型索引可以在setRootModelIndex方法的帮助下设置/更改，这将为组合框的项目设置根模型索引，为了获得根模型索引，我们使用rootModelIndex方法。

Syntax : combo_box.rootModelIndex()

Argument : It takes no argument

Return : It returns QModelIndex object

下面是实现——

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
  
        # creating a combo box widget
        self.combo_box = QComboBox(self)
  
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 150, 30)
        # creating a model
        model = QtGui.QStandardItemModel(0, 1)
  
        # creating a item
        item = QtGui.QStandardItem("New model")
  
        # adding item to the model
        model.appendRow(item)
  
        # setting model to the combo box
        self.combo_box.setModel(model)
  
        # geek list
        geek_list = ["Sayian", "Super Saiyan", "Super Sayian 2",
                                               "Super Sayian B"]
  
        # making it editable
        self.combo_box.setEditable(True)
  
        # adding list of items to combo box
        self.combo_box.addItems(geek_list)
  
        # getting root model index
        root_index = self.combo_box.rootModelIndex()
  
        # creating label to show root model index
        label = QLabel("R.M.I = " + str(root_index), self)
  
        # setting geometry to the label
        label.setGeometry(200, 100, 300, 30)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：