PyQt5 QSpinBox – 在鼠标悬停时为向下按钮添加边框

在本文中，我们将看到当鼠标悬停在旋转框的向下按钮上时如何为它添加边框。旋转框由上下两个按钮组成，向下按钮用于减小值，虽然我们可以更改它，但它有自己的默认边框。当鼠标悬停在其上时，自定义边框将出现在向下按钮上。

为此，我们必须更改与旋转框关联的样式表代码，下面是样式表代码

QSpinBox::down-button:hover
{
border : 4px 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 spin box
        self.spin = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)
  
        # setting prefix to spin
        self.spin.setPrefix("Prefix ")
  
        # setting suffix to spin
        self.spin.setSuffix(" Suffix")
  
        # setting style sheet to the spin box
        # adding border to the down button of spin box
        # and when mouse hover over it
        self.spin.setStyleSheet("QSpinBox::down-button:hover"
                                "{"
                                "border : 4px 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 ：