PyQt5 QComboBox - 检查鼠标跟踪是否被激活

在本文中，我们将看到如何检查组合框的鼠标跟踪是否被激活，组合框在按下任何按钮时接收关于鼠标的信号，但是在鼠标跟踪之后它会接收到关于鼠标的所有信号，即使没有按下任何按钮。默认情况下，此属性为 False，尽管我们可以借助setMouseTracking方法激活鼠标跟踪。

为此，我们使用hasMouseTracking方法

Syntax : combo_box.hasMouseTracking()

Argument : It takes no argument

Return : It returns bool

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, 100, 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)
  
        # setting mouse tracking
        self.combo_box.setMouseTracking(True)
  
        # setting stylesheet of the combo box
        self.combo_box.setStyleSheet("border : 1px solid red;")
  
        # creating label
        label = QLabel(self)
  
        # setting geometry to the label
        label.setGeometry(200, 200, 200, 40)
  
        # getting mouse tracking
        tracking = self.combo_box.hasMouseTracking()
  
        # setting text to the label
        label.setText("Mouse tracking enabled ? : " + str(tracking))
  
          
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：