PyQt5 – 当鼠标悬停时为关闭状态的组合框添加边框

在这篇文章中，我们将看到如何在组合框处于关闭状态和鼠标悬停时给它添加边框。关闭状态基本上是指组合框列表视图没有打开时。这个自定义的边框只在组合框处于关闭状态和鼠标悬停在它上面时出现。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 : 3px solid blue;
}

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)
 
        # editing style sheet code of combo box
        # adding border to the combo box when it is in off state
        # and mouse hover over it
        self.combo_box.setStyleSheet("QComboBox::! on:hover"
                                     "{"
                                     "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())