PyQt5 – 复选框中中间指标的背景图片

在这篇文章中，我们将看到如何为处于中间状态的复选框的指标设置背景图像。默认情况下，复选框只有两种状态，但我们也可以在setTristate方法的帮助下建立第三种状态，即没有选中或没有选中的状态，它处于这两种状态之间，称为中间状态。

为了给中间状态的指示器添加背景图片，我们必须改变中间状态指示器的样式表，下面是样式表代码。

QCheckBox::indicator:indeterminate
{
background-image : url(image.png);
}

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 geometry of check box
        checkbox.setGeometry(200, 150, 100, 60)
  
        # setting tristate check box
        checkbox.setTristate(True)
  
        # changing size of indicator
        # adding background image to the indicator
        # when it is in intermediate state
        checkbox.setStyleSheet("QCheckBox::indicator"
                               "{"
                               "width : 60px;"
                               "height : 60px;"
                               "}"
                               "QCheckBox::indicator:indeterminate"
                               "{"
                               "background-image : url(indicator_image.png);"
                               "}")
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())