PyQt5 – 按下时为关闭状态组合框添加边框

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组合框添加边框。关闭状态基本上是组合框列表视图未打开时。此自定义边框仅在组合框处于关闭状态并被按下时才会出现。

为此，我们必须更改与组合框关联的样式表，下面是样式表代码

QComboBox::!on:pressed
{
border : 3px solid blue;
}

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)
  
        # editing style sheet code of combo box
        # adding border to the combo box when it is in off state
        # and when it get pressed
        self.combo_box.setStyleSheet("QComboBox::! on:pressed"
                                     "{"
                                     "border : 3px solid blue;"
                                     "}")
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：