PyQt5 - 带有可检查项目的组合框

在本文中，我们将看到如何制作一个具有可检查项目的组合框。默认情况下，当我们创建一个组合框时，它的项目是不可检查的，即我们可以一次选择任何一个项目，尽管我们可以通过编辑组合框类来创建这样的组合框。下面是可检查组合框的外观示意图。

为了做到这一点，我们必须创建一个新的可编辑组合框类，它继承组合框并添加可检查组合框的新功能，下面是新类的语法

class CheckableComboBox(QComboBox):
    def __init__(self, parent = None):
        super(CheckableComboBox, self).__init__(parent)
        self.view().pressed.connect(self.handleItemPressed)
        self.setModel(QStandardItemModel(self))

    def handleItemPressed(self, index):
        item = self.model().itemFromIndex(index)
        if item.checkState() == Qt.Checked:
            item.setCheckState(Qt.Unchecked)
        else:
            item.setCheckState(Qt.Checked)

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
  
# new check-able combo box
class CheckableComboBox(QComboBox):
      
    # constructor
    def __init__(self, parent = None):
        super(CheckableComboBox, self).__init__(parent)
        self.view().pressed.connect(self.handleItemPressed)
        self.setModel(QStandardItemModel(self))
  
    # when any item get pressed
    def handleItemPressed(self, index):
          
        # getting the item
        item = self.model().itemFromIndex(index)
          
        # checking if item is checked
        if item.checkState() == Qt.Checked:
              
            # making it unchecked
            item.setCheckState(Qt.Unchecked)
              
        # if not checked
        else:
            # making the item checked
            item.setCheckState(Qt.Checked)
  
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 check-able combo box object
        self.combo_box = CheckableComboBox(self)
  
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 150, 30)
  
        # geek list
        geek_list = ["Sayian", "Super Sayian",
                     "Super Sayian 2", "Super Sayian B"]
  
        # adding list of items to combo box
        self.combo_box.addItems(geek_list)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
window.show()
  
# start the app
sys.exit(App.exec())

输出 ：