PyQt5 – ComboBox 处于 ON 状态时的背景颜色

在本文中，我们将了解如何在组合框处于开启状态时为其设置背景颜色。默认情况下，组合框是灰色的，尽管我们可以改变它的颜色。此背景颜色仅在组合框小部件处于开启状态时出现。组合框的开启状态基本上是下拉菜单打开时。

为此，我们必须更改组合框的样式表代码，下面是样式表代码

QComboBox::on
{
background-color : lightgreen;
}

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)
  
        # 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)
  
        # adding background color to the combo box when it is in ON state
        self.combo_box.setStyleSheet("QComboBox::on"
                                     "{"
                                     "background-color: lightgreen;"
                                     "}")
  
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：

当我们打开下拉菜单时