PyQt5 Combo Box – 在关闭状态和鼠标悬停时不同的边框颜色

在本文中，我们将看到如何在组合框处于关闭状态并将鼠标悬停在它上时为组合框设置不同的边框颜色，当我们为组合框设置边框时，尽管我们可以更改它的所有边的颜色相同分别为每一面的颜色。彩色边框只会出现组合框处于关闭状态且光标位于组合框上。

为了做到这一点，我们必须更改与组合框关联的样式表，下面是样式表代码
代码 1

QComboBox::!on:hover
{
border : 5px solid;
border-color-top : red;
border-color-right : green;
border-color-bottom : blue;
border-color-left : yellow;
}

代码 2

QComboBox::!on:hover
{
border : 5px solid;
border-color : red green blue yellow
}

两个代码都执行类似的任务，只是代码 1 是代码 2 的扩展版本。

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 a check-able combo box object
        self.combo_box = QComboBox(self)
  
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 150, 80)
  
        # 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
        # adding border to combo box
        # adding colorful border when it is OFF and mouse hover over it
        self.combo_box.setStyleSheet("QComboBox"
                                     "{"
                                     "border : 5px solid black;"
                                     "}"
                                     "QComboBox::! on:hover"
                                     "{"
                                     "border : 5px solid;"
                                     "border-color : red green blue yellow;"                                     
                                     "}")
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
window.show()
  
# start the app
sys.exit(App.exec())

输出 ：