""" code1: Using signal and slot 
import sys
from PySide6.QtWidgets import QApplication, QToolButton, QLineEdit

app = QApplication([])
lineEdit = QLineEdit()
button = QToolButton()
button.clicked.connect(lineEdit.clear)
lineEdit.show()
button.show()
app.exec()
"""

""" code2: DIY slot
import sys
from PySide6.QtWidgets import QApplication, QPushButton
from PySide6.QtCore import Slot

@Slot()
def function():
    print("The 'function' has been called!")

app = QApplication([])
button = QPushButton("Call function")
button.clicked.connect(function)
button.show()
sys.exit(app.exec())
"""

#""" code3: DIY signal and slot
import sys
from PySide6.QtWidgets import QApplication, QPushButton
from PySide6.QtCore import QObject, Signal, Slot

class Communicate(QObject):
    # create two new signals on the fly: one will handle
    # int type, the other will handle strings
    speak = Signal((float,), (int,), (str,))

    def __init__(self, parent=None):
        super().__init__(parent)

        self.speak[float].connect(self.say_something)
        self.speak[int].connect(self.say_something)
        self.speak[str].connect(self.say_something)

    # define a new slot that receives a C 'int' or a 'str'
    # and has 'say_something' as its name
    @Slot(float)
    @Slot(int)
    @Slot(str)
    def say_something(self, arg):
        if isinstance(arg, float):
            print("This is a float:", arg)
        elif isinstance(arg, int):
            print("This is a number:", arg)
        elif isinstance(arg, str):
            print("This is a string:", arg)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    someone = Communicate()

    # emit 'speak' signal with diff argments.
    # we have to specify the str as int is the default
    someone.speak[float].emit(10.2)
    someone.speak[int].emit(10.2)
    someone.speak[str].emit("Hello everyone!")
#"""