PyQt5 – 在组合框的下拉箭头上添加边框

在这篇文章中，我们将看到如何在按下组合框的下拉箭头时为其添加边框。下拉箭头基本上是一个按钮，当它被按下时就会打开列表视图。这个自定义的边框只有在按下时才会出现在下拉箭头上。为了做到这一点，我们必须改变与组合框相关的样式表，下面是样式表的代码

QComboBox::drop-arrow:pressed
{
border : 2px solid green;
}

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)
 
        # setting style sheet code of combo box
        # adding border to the drop arrow when it get pressed
        self.combo_box.setStyleSheet("QComboBox::down-arrow:pressed"
                                     "{"
                                     "border : 2px solid green;"
                                     "}")
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())