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

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# 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())

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