如何将级联菜单添加到QCheckBox

Question

我只是想知道如何通过Pyqt中的QCheckBOx添加层叠菜单，以便对每个选择进行展开，并获得更多选项。下面是我的代码

 class Example (QWidget):

    def __init__(self, fname):
        self.fname=fname
        super().__init__()
        self.initUI()

    def initUI(self):
        
        self.sheets= list(fname.keys())     
        print(self.sheets)

        self.cb1 = QCheckBox("Hello", self)
        self.cb2 = QCheckBox("You", self)
        self.cb3 = QCheckBox("Are", self)
        self.cb4 = QCheckBox("My", self)
        self.cb5 = QCheckBox("Sunshine", self)
        
                            
    

        self.resize(300,400)
        self.setWindowTitle('QCheckBox')


        formLayout = QFormLayout()
        groupBox = QGroupBox("This Is Group Box")
      
        formLayout.addRow(self.cb1)
        formLayout.addRow(self.cb2)
        formLayout.addRow(self.cb3)
        formLayout.addRow(self.cb4)
        formLayout.addRow(self.cb5)

所以我有5个选择框

但是现在我想为每个框添加层叠菜单，就像下面的图片所示

Answer 1

假设您想要的内容已在eyllanesc's example中显示，但带有复选框，下面是此代码的一个版本，带有复选框，没有动画：

from PyQt5 import QtWidgets


class CollapsibleBox(QtWidgets.QWidget):
    def __init__(self, title=""):
        super().__init__()
        self.toggle_button = QtWidgets.QCheckBox(text=title)
        self.toggle_button.clicked.connect(self.on_clicked)

        self.content_area = QtWidgets.QScrollArea(maximumHeight=0, minimumHeight=0)
        self.content_area.setSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Fixed)
        self.content_area.setFrameShape(QtWidgets.QFrame.NoFrame)

        lay = QtWidgets.QVBoxLayout(self)
        lay.setSpacing(0)
        lay.setContentsMargins(0, 0, 0, 0)
        lay.addWidget(self.toggle_button)
        lay.addWidget(self.content_area)

    def on_clicked(self):
        # this is a bit hacky, I just expand the boxes to a max. size of 1000, which should fit most needs
        self.content_area.setMaximumHeight(self.toggle_button.isChecked() * 1000)


class MainUI(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        vlay = QtWidgets.QVBoxLayout()
        for i in range(3):
            # add checkboxes and fully collapsed layouts (containing only labels for demo)
            box = CollapsibleBox(f"Collapsible Box {i+1}")
            vlay.addWidget(box)
            lay = QtWidgets.QVBoxLayout()
            # add items to the collapsed layout
            for j in range(5):
                label = QtWidgets.QLabel("demo")
                lay.addWidget(label)
            box.content_area.setLayout(lay)
        vlay.addStretch()
        widget = QtWidgets.QWidget()
        widget.setLayout(vlay)
        self.setCentralWidget(widget)


if __name__ == "__main__":
    app = QtWidgets.QApplication([])
    w = MainUI()
    w.show()
    app.exec_()