PyQt5 QColorDialog – 测试颜色对话框选项
在本文中,我们将看到如何检查 QColorDialog 小部件的选项。 QColorDialog 小部件基本上有三个可用的对话框选项,以下是选项
1. ShowAlphaChannel : 允许用户选择颜色的 alpha 分量
2. NoButtons : 不显示 OK 和 Cancel 按钮
3. DontUseNativeDialog :使用Qt的标准颜色对话框代替操作系统原生颜色对话框
默认情况下所有选项都被禁用,我们可以通过setOption
方法设置单个选项,测试选项意味着检查给定选项是否启用
为了做到这一点,我们使用带有 QColorDialog 对象的testOptions
方法
Syntax : dialog.testOptions(QColorDialog.ShowAlphaChannel)
Argument : It takes option object as argument
Return : Returns true if the given option is enabled; otherwise, returns false.
下面是实现
# 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())
输出 :