PyQt5 - 检查鼠标是否在组合框上

在本文中，我们将了解如何知道鼠标/光标是否在组合框上，为此我们使用underMouse方法，每次调用此函数时，它都会检查鼠标的位置并检查是否它的位置是否在组合框上。

为了做到这一点，我们使用underMouse方法。

Syntax : combo_box.underMouse()

Argument : It takes no argument

Return : It returns bool

实施步骤：

1.创建一个组合框
2.创建一个标签来显示结果
3. 创建一个定时器对象，每隔 100 毫秒调用一次函数
4.在定时器函数中检查组合框是否在鼠标下
5.通过标签显示结果

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 stylesheet of the combo box
        self.combo_box.setStyleSheet("border : 1px solid red;")
  
        # creating label to show label
        self.label = QLabel(self)
  
        # setting geometry to the label
        self.label.setGeometry(200, 200, 200, 30)
  
        # creating a timer object
        timer = QTimer(self)
  
        # adding action to the timer
        timer.timeout.connect(self.do_something)
  
        # starting timer
        timer.start(100)
  
    # action called by the timer
    def do_something(self):
  
        # checking if the combo box is under mouse
        under = self.combo_box.underMouse()
  
        # setting text to the label
        self.label.setText("Under Mouse ? : " + str(under))
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：