PyQt5 QComboBox - 更改 lineedit 部分的边框样式以实现不可编辑状态和鼠标悬停

在本文中，我们将看到当鼠标悬停在不可编辑的组合框上时，如何将边框样式更改为不可编辑组合框的行编辑部分，行编辑是组合框显示所选项目的部分，它本质上是可编辑的.为了设置和访问行编辑对象，我们分别使用setLineEdit和lineEdit方法。反悬停状态是鼠标不在组合框上时。

注意：当我们创建行编辑对象时，它使组合框可编辑，因此需要停止行编辑以接收输入。

In order to do this we have to do the following :

1. Create a combo box
2. Add item to the combo box
3. Create a QLineEdit object
4. Set border to QLineEdit object
5. Add border style to it when mouse hover over it
6. Make it read only
7. Add QLineEdit object to the combo box

编程需要懂一点英语

句法：

# creating line edit object
line_edit = QLineEdit()

# setting border to the line edit part
# set border style
line_edit.setStyleSheet("QLineEdit::hover"
                        "{"
                        "border : 4px black;"
                        "border-style : dotted;"
                        "}")

# making line edit non editable
line_edit.setReadOnly(True)

# adding line edit object to the combo box
self.combo_box.setLineEdit(line_edit)

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)
  
        # creating line edit object
        line_edit = QLineEdit()
  
        # setting border to the line edit part
        # set border style when mouse hover over it 
        line_edit.setStyleSheet("QLineEdit"
                                "{"
                                "border : 4px solid black;"
                                "}"
                                "QLineEdit::hover"
                                "{"
                                "border-style : dashed;"
                                "}")
  
        # making line edit non editable
        line_edit.setReadOnly(True)
  
  
        # adding line edit object to the combo box
        self.combo_box.setLineEdit(line_edit)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：