PyQt5 QColorDialog – 测试颜色对话框选项

在这篇文章中，我们将看到如何检查QColorDialog小组件的选项。QColorDialog小组件基本上有三个对话选项，下面是选项
1.ShowAlphaChannel : 允许用户选择颜色的alpha分量

2.NoButtons :不显示确定和取消按钮

3.DontUseNativeDialog : 使用Qt的标准颜色对话框，而不是操作系统的本地颜色对话框

默认情况下，所有选项都是禁用的，我们可以在setOption方法的帮助下设置单个选项，测试选项意味着检查给定的选项是否被启用

为了达到这个目的，我们使用QColorDialog对象的testOptions方法。

语法： dialog.testOptions(QColorDialog.ShowAlphaChannel)

参数： 它接受选项对象作为参数

返回： 如果给定的选项被启用，则返回真，否则返回假。

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)
  
        # setting option
        dialog.setOption(QColorDialog.ShowAlphaChannel)
  
        # 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)
  
  
        # testing the option
        value = dialog.testOption(QColorDialog.ShowAlphaChannel)
  
        # setting text to the label
        label.setText("Alpha Channel  : " + str(value))
  
  
          
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())