为什么我不能将三态QCheckBox设置为Qt.PartiallyChecked并让QCheckBox显示部分检查？

Question

我正在使用python3和PyQt5

下面的示例有三个QpushButton和一个将setTristate设置为true的QCheckBox。 我可以直接点击复选框，它会在这三个状态之间循环

问题是：如果我试图从相邻的按钮设置状态值，它只会给我检查或取消检查。真让人恼火

#!/usr/bin/env python3


from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys


class Example(QWidget):

    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        hbox = QHBoxLayout(self)
        
        
        qb1=QPushButton("Uncheck it")
        qb2=QPushButton("Partial Check it")
        qb3=QPushButton("Check it reals")
        qb1.clicked.connect(self.uncheck_it) 
        qb2.clicked.connect(self.partial_check_it) 
        qb3.clicked.connect(self.check_it) 
        
        
        
        self.qch=QCheckBox("Chonk") 
        self.qch.stateChanged.connect(self.chonker) 
        self.qch.setTristate(True) 


        hbox.addWidget(self.qch)
        hbox.addWidget(qb1)
        hbox.addWidget(qb2)
        hbox.addWidget(qb3)
        self.setLayout(hbox)

        self.move(300, 200)
        self.setWindowTitle('Choooo')
        self.show()

    def chonker(self):
        print("chonker", self.sender().text(),self.sender().isChecked())
        
    def uncheck_it(self):
        self.qch.setChecked(Qt.Unchecked)
        print ("Uncheck it")
    def partial_check_it(self):
        self.qch.setChecked(Qt.PartiallyChecked)
        print ("Partial check it")
    def check_it(self):
        self.qch.setChecked(Qt.Checked)
        print ("Check it")


    

def main():
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

Answer 1

^{}方法仅更改为两种状态：选中或未选中。如果要更改为所有3种状态，则必须使用^{}方法：

def uncheck_it(self):
    self.qch.setCheckState(Qt.Unchecked)
    print("Uncheck it")

def partial_check_it(self):
    self.qch.setCheckState(Qt.PartiallyChecked)
    print("Partial check it")

def check_it(self):
    self.qch.setCheckState(Qt.Checked)
    print("Check it")

Answer 2

谢谢用户eyllanesc

在下面的代码中，使用了适用于三态复选框的替代功能

将函数setCheckState替换为函数setCheckState。 替换的函数使用实际返回三态值的函数checkState进行检查

这个有效

#!/usr/bin/env python3


from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys


class Example(QWidget):

    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        hbox = QHBoxLayout(self)
        
        
        qb1=QPushButton("Uncheck it")
        qb2=QPushButton("Partial Check it")
        qb3=QPushButton("Check it reals")
        qb1.clicked.connect(self.uncheck_it) 
        qb2.clicked.connect(self.partial_check_it) 
        qb3.clicked.connect(self.check_it) 
        
        
        
        self.qch=QCheckBox("Chonk") 
        self.qch.stateChanged.connect(self.chonker) 
        self.qch.setTristate(True) 


        hbox.addWidget(self.qch)
        hbox.addWidget(qb1)
        hbox.addWidget(qb2)
        hbox.addWidget(qb3)
        self.setLayout(hbox)

        self.move(300, 200)
        self.setWindowTitle('Choooo')
        self.show()

    def chonker(self):
        print("chonker", self.sender().text(),self.sender().checkState())
        
    def uncheck_it(self):
        self.qch.setCheckState(Qt.Unchecked)
        print ("Uncheck it")
    def partial_check_it(self):
        self.qch.setCheckState(Qt.PartiallyChecked)
        print ("Partial check it")
    def check_it(self):
        self.qch.setCheckState(Qt.Checked)
        print ("Check it")


    

def main():
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()