PyQt5 – QScrollBar

QScrollBar 是一个控件，它使用户能够访问比用于显示它的小部件更大的文档部分。它为用户在文档中的当前位置和文档的可见量提供了一个视觉指示。滚动条通常配备有其他控件，可以实现更精确的导航。Qt以适合每个平台的方式显示滚动条。

下面是滚动条的样子

例子

我们将创建一个窗口，在其中创建一个QScrollBar和QLabel widget，每当滚动条的值发生变化时，它就会显示在标签上
以下是实现过程

# 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("GeeksforGeeks", self)
 
        # setting geometry to the label
        label.setGeometry(200, 100, 300, 80)
 
        # making label multi line
        label.setWordWrap(True)
 
        # adding action to the scroll bar
        scroll.valueChanged.connect(lambda: do_action())
 
        # creating a action method
        def do_action():
 
            # getting current value of scroll bar
            value = scroll.value()
 
            # setting text to the label
            label.setText("Current Value : " + str(value))
 
 
 
 
 
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())