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PyQt5 QColorDialog – Current Color Changed Signal

  • Last Updated : 24 Jun, 2020

In this article we will see how we can get the current color changed signal of the QColorDialog widget. This signal is emitted whenever the current color changes in the dialog. The current color can be changed by using mouse or keyboard also it can be changed programmatically wit the help of setCurrentColor method

In order to do this we use currentColorChanged method with the QColorDialog object

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Syntax : dialog.currentColorChanged.connect(lambda : print(“Color Changed”))



Argument : It takes method as argument

Action Performed : It calls the passed method

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)
  
        # getting color changed signal
        # when signal receives print the message
        dialog.currentColorChanged.connect(lambda: print("Color Changed"))
  
        # setting current color
        dialog.setCurrentColor(Qt.red)
  
        # executing the dialog
        dialog.exec_()
  
  
        # creating label
        label = QLabel("GeeksforGeeks", self)
  
        # setting geometry to the label
        label.setGeometry(100, 100, 300, 80)
  
        # making label multi line
        label.setWordWrap(True)
  
        # setting stylesheet of the label
        label.setStyleSheet("QLabel"
                            "{"
                            "border : 5px solid black;"
                            "}")
  
        color = Qt.darkBlue
  
        # 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)
  
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

Output :

Color Changed
Color Changed
Color Changed
Color Changed



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