PyQt5 – How to allow QColorDialog Widget to resize ?

In this article we will see how we can change the size of the QColorDialog. The QColorDialog has a fixed size, because it contains several custom widgets that aren’t designed to be resizable, although we can change the layout constraint to allow it to change size.

Note : The layout quickly becomes messed up with even a little bit of resizing. Also beyond a certain point, the dialog will get crashed due to floating-point exceptions, so it is not recommended to resize the dialog.

In order to do this we use setSizeConstraint method with the QColorDialog object’s layout object

Syntax : dialog.layout().setSizeConstraint(QLayout.SetNoConstraint)

Argument : It takes layout size constraint object as argument

Return : It returns None

Below is the implementation

# 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 a QColorDialog object
        dialog = QColorDialog(self)

        # making size grip property enabled
        dialog.setSizeGripEnabled(True)

        # allowing dialog to get resized
        dialog.layout().setSizeConstraint(QLayout.SetNoConstraint)

        # setting custom colors
        dialog.setCustomColor(1, Qt.red)
        dialog.setCustomColor(2, Qt.green)
        dialog.setCustomColor(3, Qt.yellow)
        dialog.setCustomColor(4, Qt.blue)

        # executing the dialog
        dialog.exec_()


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

        # setting geometry to the label
        label.setGeometry(10, 10, 400, 280)

        # making label multi line
        label.setWordWrap(True)

        # setting stylesheet of the label
        label.setStyleSheet("QLabel"
                            "{"
                            "border : 5px solid black;"
                            "}")

        # getting the custom color
        color = dialog.customColor(4)

        # setting graphic effect to the label
        graphic = QGraphicsColorizeEffect(self)

        # setting color to the graphic
        graphic.setColor(color)

        # setting graphic to the label
        label.setGraphicsEffect(graphic)


        self.deleteLater()


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

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

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

Output :