PyQt5 – 当鼠标悬停时为不可编辑的组合框添加边框

在这篇文章中，我们将看到如何在不可编辑的组合框上添加边框，并将鼠标悬停在它上面。默认情况下，组合框是有边框的，尽管我们可以改变边框，带有自定义边框的组合框只有在不可编辑和光标在它上面时才会出现。

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::!editable: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 non-editable
        # and when mouse hover over it
        self.combo_box.setStyleSheet("QComboBox::! editable: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())