Pyside6/Qt实现下拉复选框

效果：

源码： 

from PySide6.QtWidgets import QComboBox, QListWidget, QCheckBox, QListWidgetItem, QLineEdit, QApplication, QHBoxLayout, \
    QWidget
from PySide6.QtGui import Qt
from PySide6.QtCore import Signal
 
 
# 自定义控件-点击按钮下拉CheckBox列表
class XCombobox(QComboBox):
    # 有item被选择时，发出信号
    itemChecked = Signal(list)
    # 保存QCheckBox控件
    _checks = []
 
    def __init__(self, parent) -> None:
        super().__init__(parent)
        #   通过setView()设置下拉列表控件，通过setLineEdit替换原有的文本显示控件，并设置为只读模式。预设"全选"选项。
        listwgt = QListWidget(self)
        self.setView(listwgt)
        self.setModel(listwgt.model())
        lineEdit = QLineEdit(self)
        lineEdit.setReadOnly(True)
        self.setLineEdit(lineEdit)
        # 预设'全选'
        self.add_item('全选')
 
    def add_item(self, text: str):
        #   在这里给每个CheckBox都绑定了信号，目的是每次Check都能作出响应。
        check = QCheckBox(text, self.view())
        check.stateChanged.connect(self.on_state_changed)
        self._checks.append(check)
        item = QListWidgetItem(self.view())
        # 设置item不可选中(只可以被Check)
        item.setFlags(item.flags() & Qt.IntersectsItemShape)
        self.view().addItem(item)
        self.view().setItemWidget(item, check)
 
    def add_items(self, texts: list):
        for text in texts:
            self.add_item(text)
 
    def clear(self):
        self.view().clear()
 
    def get_selected(self):
        sel_data = []
        for chk in self._checks:
            if self._checks[0] == chk:
                continue
            if chk.checkState() == Qt.Checked:
                sel_data.append(chk.text())
        return sel_data
 
    def set_all_state(self, state):
        for chk in self._checks:
            chk.blockSignals(True)
            chk.setCheckState(Qt.CheckState(state))
            chk.blockSignals(False)
 
    def on_state_changed(self, state):
 
        if self.sender() == self._checks[0]:
            self.set_all_state(state)
 
        sel_data = self.get_selected()
        self.itemChecked.emit(sel_data)
        self.lineEdit().setText(';'.join(sel_data))
 
 
def printa(data: list):
    print(data)
 
 
if __name__ == '__main__':
    app = QApplication()
    wind = QWidget()
    wind.resize(500, 500)
 
    cmbox = XCombobox(wind)
    cmbox.add_items(['AAA', 'BBB', 'CCC', 'DDD','AAA', 'BBB', 'CCC', 'DDD','AAA', 'BBB', 'CCC', 'DDD','AAA', 'BBB', 'CCC', 'DDD','AAA', 'BBB', 'CCC', 'DDD','AAA', 'BBB', 'CCC', 'DDD','AAA', 'BBB', 'CCC', 'DDD','AAA', 'BBB', 'CCC', '11DDD'])
    # cmbox.itemChecked.connect(printa)
 
    hyout = QHBoxLayout(wind)
    hyout.addWidget(cmbox)
    wind.setLayout(hyout)
 
    wind.show()
    app.exec()