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This article mainly shows you the "sample analysis of decorator signals and slots in python". The content is simple and easy to understand, and the organization is clear. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn the "sample analysis of decorator signals and slots in python" article.

Decorator signal and groove

The so-called decorator signal and groove, that is, through the decorator method to define the signal and groove function, the specific use method is as follows

@PyQt5.QtCore.pyqtSlot(parameter)def on_sender object name_emission signal name (self, parameter): pass

This method works if the following function has been executed:

QMetaObject.connectSlotsByName(QObject)

In the above code,'sender object name' is the name set using setObjectName function, so the naming convention of custom slot function can also be regarded as: on+ name set using setObjectName + signal name

Here are some concrete examples.

import sysfrom PyQt5.QtWidgets import QApplication,QWidget,QHBoxLayout,QPushButtonfrom PyQt5 import QtCoreclass CustWidget(QWidget): def __init__(self,parent=None): super(CustWidget, self).__ init__(parent) #Create button, add to self window self.okButton=QPushButton ('ok ',self) #Set object name with setObjectName self.okButton.setObjectName ('okButton ') #Set its layout to horizontal, and add button controls to it layout=QHBoxLayout(self) layout.addWidget (self.okButton) #TODo First Method #self.okButton.clicked.connect (self.okButton_clicked) #def okButton_clicked( self ): # print ('ok button')#Second method QtCore.QMetaObject.connectSlotsByName(self) @QtCore.pyqtSlot() def on_okButton_clicked( self ): print ('ok button') if __name__ == '__main__': app=QApplication(sys.argv) win=CustWidget() win.show () sys.exit(app.exec_())

Run the program, display the effect as shown in the figure, click the ok button, the console prints the expected debugging information

QtCore.QMetaObject.connectSlotsByName(self)

In fact, it is the core code in PyQt5 that automatically connects to slot functions based on signal names. This line of code is used to connect certain objects of descendant objects in QObject to corresponding slot functions according to their objectName. For example, name

Assuming the code QtCore.QMetaObject.connectSlotsByName(self) has been executed, the following code

@QtCore.pyqtSlot()

def on_okButton_clicked( self ):

print ('OK button clicked ')

is automatically recognized as the following code:

def __init__(self,parent=None):

self.okButton.clicked.connect(self.okButton_clicked)

def okButton_clicked(self):

print ('OK button clicked ')

The above is "python decorator signal and groove example analysis" all the contents of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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