PyQt5 QDockWidget – Allowed Area Changed Signal

In this article we will see how we can allowed area change signal of the QDockWidget. QDockWidget provides the concept of dock widgets, also known as tool palettes or utility windows. Dock windows are secondary windows placed in the dock widget area around the central widget in a QMainWindow(original window). Dock can be moved anywhere in the main window, setting allowed areas where the dock widget may be placed it can be set with the help of setAllowedAreas method. This signal is emitted when allowed area of dock changes.

In order to do this we will use allowedAreasChanged method with the dock widget object. Syntax : dock.allowedAreasChanged.connect(method) Argument : It takes method as argument Return : It returns None

Below is the implementation 

Python3

# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys


class Window(QMainWindow):

    def __init__(self):
        super().__init__()

        # setting title
        self.setWindowTitle("Python ")

        # setting geometry
        self.setGeometry(100, 100, 500, 400)

        # calling method
        self.UiComponents()

        # showing all the widgets
        self.show()

    # method for components
    def UiComponents(self):

        # creating dock widget
        dock = QDockWidget("GeeksforGeeks", self)

        # push button
        push = QPushButton("Press", self)

        # setting widget to the dock
        dock.setWidget(push)

        # creating a label
        label = QLabel("GeeksforGeeks", self)

        # setting geometry to the label
        label.setGeometry(100, 200, 300, 80)

        # making label multi line
        label.setWordWrap(True)

        # setting geometry tot he dock widget
        dock.setGeometry(100, 0, 200, 30)

        # getting allowed area change signal
        # setting text to the label
        dock.allowedAreasChanged.connect(lambda: label.setText("Allowed Area is changed"))

        # setting allowed area
        dock.setAllowedAreas(Qt.LeftDockWidgetArea)




# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())

Output :