PyQt5 QScrollBar – 滑块释放信号
在这篇文章中,我们将看到如何获得QScrollBar的滑块释放信号。QScrollBar是一个控件,它使用户能够访问文档中比用来显示它的小部件更大的部分。滑块是条内的可滚动对象。当用户用鼠标释放滑块时,或者以编程方式调用setSliderDown(false)时,就会发出这个信号。
为了做到这一点,我们将使用滚动条对象的sliderReleased方法。
语法: roll.sliderReleased.connect(method)
参数: 它以方法为参数
返回: 它返回无
例子: 下面是一个实现
# 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, 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)
# getting slider released signal
scroll.sliderReleased.connect(lambda: do_action())
# method called when signal is emitted
def do_action():
# setting text to the label
label.setText("Slider Released Signal Emitted")
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())