PyQt5 QComboBox 当它处于关闭状态且鼠标悬停在它上面时，改变边框样式

在这篇文章中，我们将看到如何改变组合框在关闭状态和鼠标悬停在它上面时的边框样式，边框样式可以是虚线、虚线等。当我们给组合框设置边框时，它是连续的，尽管我们可以改变它。只有当组合框处于关闭状态并且光标在组合框上时，样式化的边框才是可见的，否则正常的边框将是可见的。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::!off:hover
{
border : 4px black;
border-style : dotted;
}

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 check-able combo box object
        self.combo_box = QComboBox(self)
 
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 100, 40)
 
        # making combo box editable
        # self.combo_box.setEditable(True)
 
        # 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 stylesheet of the combo box
        # set the border style wen it is in off state
        # and mouse hover over it
        self.combo_box.setStyleSheet("QComboBox"
                                     "{"
                                     "border : 4px solid black"
                                     "}"
                                     "QComboBox::! off:hover"
                                     "{"
                                     "border : 4px black;"
                                     "border-style : dotted;"
                                     "}")
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())