PyQt5 – 鼠标悬停时为不可编辑组合框的 lineedit 部分添加边框

在本文中，我们将看到当鼠标悬停在不可编辑组合框的行编辑部分时，如何设置边框。行编辑部分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。

注意：当我们将行编辑对象添加到组合框时，它使组合框可编辑，因此需要使行编辑对象不可编辑。

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. Make line edit object non editable
5. Set border to the QLineEdit object when mouse hover over it
6. 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()

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

# setting border to the line edit when mouse hover over it
line_edit.setStyleSheet("QLineEdit::hover"
                        "{"
                        "border : 2px solid green;"
                        "}")

# 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 combo box widget
        self.combo_box = QComboBox(self)
  
  
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 150, 30)
  
        # 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()
  
        # making line edit non editable
        line_edit.setReadOnly(True)
  
        # setting border to the line edit when mouse hover over it
        line_edit.setStyleSheet("QLineEdit::hover"
                                "{"
                                "border : 2px solid green;"
                                "}")
  
        # 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：