PyQt5 QColorDialog – 当前颜色改变的信号

在这篇文章中，我们将看到如何获得QColorDialog小组件的当前颜色变化信号。只要对话框中的当前颜色发生变化，就会发出这个信号。当前的颜色可以通过鼠标或键盘来改变，也可以在setCurrentColor方法的帮助下以编程方式改变。

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

参数： 将方法作为参数

执行的动作： 调用通过的方法。

下面是实现方法

# 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())

输出:

Color Changed
Color Changed
Color Changed
Color Changed