CODEWITHSUNDEEP
pythonsignalspyqt4signals-slots
student
student

Reputation: 1646

Define pyqt4 signals with a list as argument

According to

http://pyqt.sourceforge.net/Docs/PyQt4/new_style_signals_slots.html

I can define a pyqt4-signal with takes an integer argument by mysignal = pyqtSignal(int). How can I define a signal which takes an integer and a list of strings or more generally of an object called myobject as argument.

Upvotes: 16

Views: 17144

Answers (1)

Vicent
Vicent

Reputation: 5452

The following code creates a signal which takes two arguments: an integers and a list of objects. The UI contains just a button. The signal is emitted when the button is clicked.

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

class Foo(object):
    pass

class MyWidget(QWidget):
    mysignal = pyqtSignal(int, list)
    
    def __init__(self, parent=None):
        super(MyWidget, self).__init__(parent)
        self.hlayout = QHBoxLayout()
        self.setLayout(self.hlayout)
        self.b = QPushButton("Emit your signal!", self)
        self.hlayout.addWidget(self.b)
        self.b.clicked.connect(self.clickHandler)
        self.mysignal.connect(self.mySignalHandler)
    
    def clickHandler(self):
        self.mysignal.emit(5, ["a", Foo(), 6])

    def mySignalHandler(self, n, lst):
        print(n)
        print(lst)

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    w = MyWidget()
    w.show()
    sys.exit(app.exec_())

When clicking the button you should see something like:

5
['a', <__main__.Foo object at 0xb7423e0c>, 6]

on your terminal.

Upvotes: 22

Related Questions