PyQt5 QScrollBar – 滑块移动信号

在本文中，我们将了解如何获取 QScrollBar 的滑块移动信号。 QScrollBar 是一个控件，它使用户能够访问大于用于显示它的小部件的文档部分。 Slider 是栏内的可滚动对象。当sliderDown 为真并且滑块移动时发出此信号。这通常发生在用户拖动滑块时。该值是新的滑块位置。即使在跟踪关闭时也会发出此信号。

In order to do this we will use sliderMoved method with the scroll bar object.
Syntax : scroll.sliderMoved.connect(method)
Argument : It takes method as argument
Return : It returns None

编程需要懂一点英语

下面是实现

Python3

# 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, 500, 400)
 
        # calling method
        self.UiComponents()
 
        # showing all the widgets
        self.show()
 
 
 
    # method for components
    def UiComponents(self):
 
        scroll = QScrollBar(self)
 
        # setting geometry of the scroll bar
        scroll.setGeometry(100, 50, 30, 200)
 
        # making its background color to green
        scroll.setStyleSheet("background : lightgrey;")
 
        # creating a label
        label = QLabel("GeesforGeeks", self)
 
        # setting geometry to the label
        label.setGeometry(200, 100, 300, 80)
 
        # making label multi line
        label.setWordWrap(True)
 
        # getting slider moved signal
        scroll.sliderMoved.connect(lambda: do_action())
 
        # method called when signal is emitted
        def do_action():
 
            # setting text to the label
            label.setText("Slider Moved Signal Emitted")
 
 
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())

输出：