How to add signals to a QLabel in PyQt5?

Question

I have the code below for a interactive label in PyQt4 that can be clicked, right clicked and scrolled. I am converting the code for PyQt5 and lots of things in my code are right now based on this element.

class ExtendedQLabel(QLabel):
    def __init(self, parent):
        super().__init__(parent)

    def mousePressEvent(self, ev):
        if ev.button() == QtCore.Qt.RightButton:
            self.emit(SIGNAL('rightClicked()'))
        else:
            self.emit(SIGNAL('clicked()'))

    def wheelEvent(self, ev):
        self.emit(SIGNAL('scroll(int)'), ev.delta())

How do I make this PyQt5 compatible?

Answer 1

Ok, after a lot of things I understood what I was doing wrong:

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

class ExtendedQLabel(QLabel):
    def __init(self, parent):
        super().__init__(parent)

    clicked = pyqtSignal()
    rightClicked = pyqtSignal()

    def mousePressEvent(self, ev):
        if ev.button() == Qt.RightButton:
            self.rightClicked.emit()
        else:
            self.clicked.emit()

if __name__ == '__main__':
    app = QApplication([])
    eql = ExtendedQLabel()
    eql.clicked.connect(lambda: print('clicked'))
    eql.rightClicked.connect(lambda: print('rightClicked'))
    eql.show()
    app.exec_()

In the line with the text clicked = pyqtSignal() and rightClicked = pyqtSignal()what ties those signals to that class that makes the code above work? Well the answer is the correct indentation, correct indentation will nest the variable to the class instead of randomly creating a variable that has no use. It took me a lot of time to perceive this, so thought lefting this here could be useful if someone google this.