（五 交互-7）PyQT5 combo box 中插入 check box 实现多选功能

1. 初始化各控件

1. checkbox（用于勾选）
2. LineEdit（用于显示勾选内容）
3. ListWidget（用于存放 checkbox)

代码示例

    self.qCheckBox = []
    self.qLineEdit = QLineEdit()
    self.qLineEdit.setReadOnly(True)
    self.qListWidget = QListWidget()

2. 向 ListWidget 中循环插入 checkbox 并使之保持可选状态

代码示例

def addQCheckBox(self, i):
    self.qCheckBox.append(QCheckBox())
    qItem = QListWidgetItem(self.qListWidget)
    self.qCheckBox[i].setText(self.items[i])
    self.qListWidget.setItemWidget(qItem, self.qCheckBox[i])
for i in range(0, self.row_num):
    self.addQCheckBox(i)
    self.qCheckBox[i].setChecked(True)

3. 绑定事件

如果勾选/取消勾选 checkbox，即 checkbox 状态发生改变，则返回所有的勾选内容列表。

代码示例

    for i in range(1, self.row_num):
            self.qCheckBox[i].stateChanged.connect(self.fn_check_multi_single)

4. 完整代码

class ComboCheckBox(QComboBox):
    def __init__(self, parent=None):
        super(ComboCheckBox, self).__init__(parent)

    def fn_init_data(self, list_items, text="全选"):

        self.setGeometry(QtCore.QRect(930, 50, 281, 31))
        self.setStyleSheet("font: 16pt \"Agency FB\";")

        self.items = list_items
        self.row_num = len(self.items)
        self.selected_row_num = 0
        self.qCheckBox = []
        self.qLineEdit = QLineEdit()
        self.qLineEdit.setReadOnly(True)
        self.qListWidget = QListWidget()

        for i in range(0, self.row_num):
            self.addQCheckBox(i)
            self.qCheckBox[i].setChecked(True)

        self.list_selected_item = list_items[1:]

        self.setModel(self.qListWidget.model())
        self.setView(self.qListWidget)
        self.setLineEdit(self.qLineEdit)
        self.qLineEdit.setText(text)

    def fn_init_table(self):
        self.setGeometry(QtCore.QRect(930, 50, 281, 31))
        self.setStyleSheet("font: 16pt \"Agency FB\";")
        self.qLineEdit = QLineEdit()
        self.qLineEdit.setReadOnly(True)
        self.setLineEdit(self.qLineEdit)
        self.qLineEdit.setText("请选择")

    def fn_init_event(self):
        self.qCheckBox[0].stateChanged.connect(self.fn_check_all)
        for i in range(1, self.row_num):
            self.qCheckBox[i].stateChanged.connect(self.fn_check_multi_single)

    def addQCheckBox(self, i):
        self.qCheckBox.append(QCheckBox())
        qItem = QListWidgetItem(self.qListWidget)
        self.qCheckBox[i].setText(self.items[i])
        self.qListWidget.setItemWidget(qItem, self.qCheckBox[i])

    def fn_check_multi_single(self):
        show = ''
        Outputlist = []
        for i in range(1, self.row_num):
            if self.qCheckBox[i].isChecked() == True:
                Outputlist.append(self.qCheckBox[i].text())
        self.selected_row_num = len(Outputlist)
        self.list_selected_item = Outputlist
        #print(Outputlist)

        self.qLineEdit.setReadOnly(False)
        self.qLineEdit.clear()
        for i in Outputlist:
            show += i + ';'
        if self.selected_row_num == 0:
            self.qCheckBox[0].setCheckState(0)
            show = '请选择'
        elif self.selected_row_num == self.row_num - 1:
            self.qCheckBox[0].setCheckState(2)
            show = '全选'
        else:
            self.qCheckBox[0].setCheckState(1)
        self.qLineEdit.setText(show)
        self.qLineEdit.setReadOnly(True)

    def fn_check_all(self, status):
        if status == 2:         #全选
            for i in range(1, self.row_num):
                self.qCheckBox[i].setChecked(True)
        elif status == 1:       #不全选
            if self.selected_row_num == 0:
                self.qCheckBox[0].setCheckState(2)
        elif status == 0:       #全不选
            self.fn_clear()

    def fn_clear(self):
        for i in range(self.row_num):
            self.qCheckBox[i].setChecked(False)

5. 参考链接

https://blog.csdn.net/LJX4ever/article/details/78039318