PyQt5 QColorDialog – 完成信号

在这篇文章中，我们将看到如何获得QColorDialog小组件的完成信号。这个信号是在对话框的结果代码被设置后发出的，无论是用户还是通过调用doed(), accept(), or reject()。

注意： 当用hide()或setVisible(false)隐藏对话框时，这个信号不会被发出。这包括在对话框可见时删除它。为了做到这一点，我们使用QColorDialog对象的finished方法

语法： dialog.finished.connect(lambda: print(“Finished Signal”)

参数： 将方法作为参数

执行的动作： 当完成信号发出时，它将调用传递的方法。

以下是实现方法

# 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 finished signal
        # printing message when signal received
        dialog.finished.connect(lambda: print("Finished Signal Emitted"))
 
        # 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.black
 
        # 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: