PyQt5 QScrollBar – 获得倒置的控制属性
在这篇文章中,我们将看到如何获得QScrollBar的倒置控制属性。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。这个属性持有滑块是否反转其滚轮和按键事件。如果这个属性是假的,滚动鼠标滚轮 “向上 “和使用像page up这样的键会将滑块的值增加到最大。否则,按向上翻页键将使滑块的值向最小值移动。它可以在setInvertedControls方法的帮助下设置。
为了做到这一点,我们将对滚动条对象使用invertedControls方法。
语法: roll.invertedControls()
参数: 不需要参数
返回: 返回bool。
下面是实现方法
# 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;")
# setting inverted appearance
scroll.setInvertedAppearance(True)
# setting inverted control
scroll.setInvertedControls(True)
# 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 value changed signal
scroll.valueChanged.connect(lambda: do_action())
# method called when signal is emitted
def do_action():
# setting text to the label
label.setText("Current Value : " + str(scroll.value()))
# getting inverted control property
value = scroll.invertedControls()
# setting text to the label
label.setText("Inverted Controls : " + 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 :