PyQt5 组合框 - 按下时处于关闭状态时的边框大小不同

在本文中，我们将看到如何在组合框处于关闭状态并被按下时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，它的所有边的宽度相同，尽管我们可以更改每边的宽度，只有当组合框处于关闭状态并按下组合框时才会出现不同宽度的边框，否则将显示正常边框。关闭状态是指项目视图未打开时。

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:pressed
{
border : solid black;
border-width-top : 1px;
border-width-right : 5px;
border-width-bottom : 2px;
border-width-left : 10px;
}

代码 2

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

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 different width border when it is OFF and it get pressed
        self.combo_box.setStyleSheet("QComboBox"
                                     "{"
                                     "border : 5px solid black;"
                                     "}"
                                     "QComboBox::! on:pressed"
                                     "{"
                                     "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())

输出 ：