PyQt5组合框 当鼠标悬停在关闭状态时，不同的边框大小

在这篇文章中，我们将看到当组合框处于关闭状态时，当鼠标悬停在它上面时，我们如何为组合框设置不同的边框宽度，当我们为组合框设置边框时，虽然我们可以分别改变每边的宽度，但所有边框的宽度都是一样的，只有当组合框处于关闭状态且光标在组合框上时，才会出现不同宽度的边框，否则将显示正常的边框。关闭状态是指项目视图没有打开时。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

代码1

QComboBox::!off:hover
{
border : solid black;
border-width-top : 1px;
border-width-right : 5px;
border-width-bottom : 2px;
border-width-left : 10px;
}

代码2

QComboBox::!on:hover
{
border : solid black;
border-width : 1px 5px 2px 10px;
}

这两段代码执行类似的任务，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 different width border when it is OFF and mouse hover over it
        self.combo_box.setStyleSheet("QComboBox"
                                     "{"
                                     "border : 5px solid black;"
                                     "}"
                                     "QComboBox::! on:hover"
                                     "{"
                                     "border : solid black;"
                                     "border-width : 1px 5px 2px 10px;;"                                    
                                     "}")


# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

window.show()

# start the app
sys.exit(App.exec())