QLabel When Clicking, behind widget triggers too

Emrecp

Hi,
video
If you watch video, you will see when i click label; Form click event triggers too. But this not happens for QPushButton. This happens for QLabel.

Code:

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

class Window(QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        self.LBL = QLabel("hi only click me not form!", self)
        self.LBL.resize(QSize(300,50))
        self.LBL.setFont(QFont('Arial',20))
        def Clicked_Form(event):
            if event.button () !=Qt.LeftButton:
                return
            print("Clicked Form!!!!!")
        self.mousePressEvent = Clicked_Form
        def Clicked_Label(event):
            if event.button () !=Qt.LeftButton:
                return
            print("Clicked label!")
        self.LBL.mouseReleaseEvent = Clicked_Label


        self.BTN = QPushButton("hi if you click me, form will not triggered.", self)
        self.BTN.setGeometry(QRect(0,100,300,50))

        self.resize(QSize(600,480))
        self.show()


def main():

    app = QApplication(sys.argv)
    w = Window()


    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

Is any way to trigger only QLabel not behind widget(main form) of QLabel?
Thanks.

Emrecp

@SGaist and @Christian-Ehrlicher Thanks, solved!
Code:

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

class Window(QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        self.LBL = QLabel("hi only click me not form!", self)
        self.LBL.resize(QSize(300,50))
        self.LBL.setFont(QFont('Arial',20))
        def Clicked_Form(event):
            event.ignore()
            if event.button () !=Qt.LeftButton:
                return
            print("Clicked Form!!!!!")
            event.setAccepted(False)
        def Clicked_Label_Press(event):
            event.setAccepted(True)
        def Clicked_Label_Release(event):
            if event.button () !=Qt.LeftButton:
                return
            print("Clicked label! Release")

        self.LBL.mousePressEvent = Clicked_Label_Press
        self.LBL.mouseReleaseEvent = Clicked_Label_Release
        self.mousePressEvent = Clicked_Form


        self.BTN = QPushButton("hi if you click me, form will not triggered.", self)
        self.BTN.setGeometry(QRect(0,100,300,50))

        self.resize(QSize(600,480))
        self.show()


def main():
    app = QApplication(sys.argv)
    w = Window()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

Christian Ehrlicher

Accept the event.

Emrecp

@Christian-Ehrlicher

        def Clicked_Label(event):            
            if event.button () !=Qt.LeftButton:
                return
            print("Clicked label!")
            event.accept()

Not works. Because window triggers before than label.

Christian Ehrlicher

You have to check for accepted() in Clicked_Form and call the base implementation before (don't know how/if this works with pyhon). Events are propagated this way.

Emrecp

@Christian-Ehrlicher Can you write c++ code?

SGaist

Hi,

Sure @Christian-Ehrlicher can write C++ and he's pretty good at it.

You should rather properly subclass your widget rather than the monkey patching you are currently doing. As @Christian-Ehrlicher already suggested, you should also call the base class implementation to ensure proper propagation or stop it calling accept.

Emrecp

@SGaist and @Christian-Ehrlicher Thanks, solved!
Code:

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

class Window(QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        self.LBL = QLabel("hi only click me not form!", self)
        self.LBL.resize(QSize(300,50))
        self.LBL.setFont(QFont('Arial',20))
        def Clicked_Form(event):
            event.ignore()
            if event.button () !=Qt.LeftButton:
                return
            print("Clicked Form!!!!!")
            event.setAccepted(False)
        def Clicked_Label_Press(event):
            event.setAccepted(True)
        def Clicked_Label_Release(event):
            if event.button () !=Qt.LeftButton:
                return
            print("Clicked label! Release")

        self.LBL.mousePressEvent = Clicked_Label_Press
        self.LBL.mouseReleaseEvent = Clicked_Label_Release
        self.mousePressEvent = Clicked_Form


        self.BTN = QPushButton("hi if you click me, form will not triggered.", self)
        self.BTN.setGeometry(QRect(0,100,300,50))

        self.resize(QSize(600,480))
        self.show()


def main():
    app = QApplication(sys.argv)
    w = Window()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()