PyQt5 QSpinBox – 检查信号是否被阻断
在这篇文章中,我们将看到如何检查自旋盒的信号是否被阻断,阻断信号意味着与自旋盒相连的方法将不会收到信号,例如,当我们向其添加动作时,当其值发生变化时,该动作将无法工作。被阻断时发出的信号不会被缓冲。为了阻止信号,我们使用blockSignals方法。
为了做到这一点,我们使用signalsBlocked方法。
语法: spin_box.signalsBlocked()
参数: 它不需要参数
返回: 它返回无。
以下是实现方法
# 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, 600, 400)
# calling method
self.UiComponents()
# showing all the widgets
self.show()
# method for widgets
def UiComponents(self):
# creating spin box
self.spin = QSpinBox(self)
# setting geometry to spin box
self.spin.setGeometry(100, 100, 250, 40)
# setting prefix to spin
self.spin.setPrefix("Prefix ")
# setting suffix to spin
self.spin.setSuffix(" Suffix")
# blocking signals of the spin box
self.spin.blockSignals(True)
# creating a label
self.label = QLabel("Label ", self)
# setting geometry to the label
self.label.setGeometry(100, 200, 300, 30)
# checking if signals are blocked or not
check = self.spin.signalsBlocked()
# setting text to the label
self.label.setText("Signals Blocked ? : " + str(check))
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())
输出: