PyQt5组合框 按压时的不同边框颜色

在这篇文章中，我们将看到如何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，所有的边框都是相同的颜色，尽管我们可以分别改变每边的颜色。只有当组合框被按下时，彩色的边框才会出现，否则正常的边框是可见的。

为了做到这一点，我们必须改变与组合框相关的样式表，下面是样式表代码
代码1

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

代码2

QComboBox::pressed
{
border : 5px solid;
border-color : red green blue yellow
}

这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。

下面是执行情况

# 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, 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 get pressed
        self.combo_box.setStyleSheet("QComboBox"
                                     "{"
                                     "border : 5px solid black;"
                                     "}"
                                     "QComboBox::pressed"
                                     "{"
                                     "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())