PyQt5 - 在状态 ComboBox 上为不可编辑添加边框

在本文中，我们将了解如何在不可编辑组合框处于开启状态时为其添加边框。 ON 状态基本上是组合框列表视图打开时。此自定义边框仅在组合框处于开启状态且不可编辑时出现。

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::!editable:on
{
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 non-editable
        # and is in ON state
        self.combo_box.setStyleSheet("QComboBox::! editable:on"
                                     "{"
                                     "border : 3px solid red;"
                                     "}")
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：

按下组合框后