PyQt5 – 当组合框被按下时，其背景颜色为关闭状态

在这篇文章中，我们将看到如何设置组合框在关闭状态下被按下时的背景颜色。默认情况下，组合框是灰色的，尽管我们可以改变它的颜色。这种背景颜色只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指下拉菜单没有打开时。为了做到这一点，我们必须改变组合框的样式表代码，下面是样式表代码—-。

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

以下是实施情况

# 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())