📜  PyQt5 - QScrollBar

📅  最后修改于: 2022-05-13 01:54:47.761000             🧑  作者: Mango

PyQt5 - QScrollBar

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。它提供了用户在文档中的当前位置和可见文档数量的视觉指示。滚动条通常配备其他控件,可以实现更准确的导航。 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,我们将在其中创建一个 QScrollBar 和 QLabel 小部件,每次滚动条的值发生变化时,它都会显示在标签中
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)
 
        # 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())


输出 :