PyQt5 - 如果按下 ComboBox OFF 状态的背景颜色

在本文中，我们将看到如何在组合框处于关闭状态并被按下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关闭状态并被按下时出现。组合框的关闭状态基本上是下拉菜单未打开时。

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:pressed
{
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 OFF state
        # and when it get pressed
        self.combo_box.setStyleSheet("QComboBox::! on:pressed"
                                     "{"
                                     "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 ：