PyQt5 – 中间状态下被按下的复选框的背景颜色

在这篇文章中，我们将看到如何设置复选框在中间状态下被按下时的颜色。默认情况下，复选框的标签部分没有设置按下的颜色，尽管指标在被按下时有一个浅蓝色的背景颜色。中间状态是介于复选和未复选之间的状态，它是在setTristate方法的帮助下创建的第三种状态。为了在中间（不确定）状态下给复选框添加背景色，我们必须编辑复选框对象的样式表代码。下面是样式表的代码。

QCheckBox::indeterminate:pressed
{
background-color : cyan;
}

以下是实施情况。

# 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, 600, 400)
 
        # calling method
        self.UiComponents()
 
        # showing all the widgets
        self.show()
 
    # method for widgets
    def UiComponents(self):
        # creating the check-box
        checkbox = QCheckBox('Geek ?', self)
 
        # setting tristate check box
        checkbox.setTristate(True)
 
        # setting geometry of check box
        checkbox.setGeometry(200, 150, 100, 30)
 
        # adding background color to the pressed check box label part
        # when it is in intermediate state
        checkbox.setStyleSheet("QCheckBox:indeterminate:pressed"
                               "{"
                               "background-color : cyan;"
                               "}")
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())