PySide6 GUI 编程（8）：QCheckBox的使用

from PySide6.QtCore import Qt
from PySide6.QtWidgets import QApplication, QCheckBox, QMainWindow


def show_check_state(state: int):
    print('checkbox state:', Qt.CheckState(state))


class MyCheckBox(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle('CheckBox')
        my_checkbox = QCheckBox('TestCheckBox')
        # my_checkbox.setCheckable(False)
        my_checkbox.stateChanged.connect(show_check_state)
        self.setCentralWidget(my_checkbox)


if __name__ == '__main__':
    app = QApplication()
    ins = MyCheckBox()
    ins.show()
    app.exec()

from PySide6.QtCore import Qt
from PySide6.QtWidgets import QApplication, QCheckBox, QMainWindow


def show_check_state(state: int):
    print('checkbox state:', Qt.CheckState(state))


class MyCheckBox(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle('CheckBox')
        my_checkbox = QCheckBox('TestCheckBox')
        # my_checkbox.setCheckable(False)  # 默认不可勾选
        # my_checkbox.setCheckState(Qt.CheckState.Checked) # 默认已经被勾选
        # my_checkbox.setChecked(True) # 默认已经被勾选
        my_checkbox.setTristate(True)
        my_checkbox.stateChanged.connect(show_check_state)
        self.setCentralWidget(my_checkbox)


if __name__ == '__main__':
    app = QApplication()
    ins = MyCheckBox()
    ins.show()
    app.exec()

from PySide6.QtCore import Qt
from PySide6.QtWidgets import QApplication, QCheckBox, QMainWindow, QVBoxLayout, QWidget


class MyMultiCheckBox(QMainWindow):
    def __init__(self):
        super().__init__()
        self.root_checkbox = QCheckBox('顶层三态可选框')
        self.root_checkbox.setTristate(True)  # 设置三态
        v_layout = QVBoxLayout()
        v_layout.addWidget(self.root_checkbox)
        self.check_boxes = []
        self.all_option_checkbox_count = 3
        self.option_checked_count = 0
        for i in range(0, self.all_option_checkbox_count):
            option_checkbox = QCheckBox('单选选项-{}'.format(i))  # 子单选框
            option_checkbox.setCheckable(True)  # 设置允许勾选
            option_checkbox.setCheckState(Qt.CheckState.Unchecked)  # 设置默认为未勾选
            self.check_boxes.append(option_checkbox)
            v_layout.addWidget(option_checkbox)
            # 每个option_checkbox 被勾选或不被勾选时，都需要更新 root_checkbox 的状态
            option_checkbox.checkStateChanged.connect(self.update_root_checkbox_state)

        # 更改 root_checkbox 的状态时，同时更新 option_checkbox 的状态
        self.root_checkbox.checkStateChanged.connect(self.update_option_checkbox_state)

        container = QWidget()
        container.setLayout(v_layout)
        self.setCentralWidget(container)

    def update_root_checkbox_state(self, state: Qt.CheckState):
        print('option_check_box change state to: {}'.format(state))
        if state == Qt.CheckState.Checked:
            self.option_checked_count += 1
            print('option_check_box += 1')
        elif state == Qt.CheckState.Unchecked:
            self.option_checked_count -= 1
            print('option_check_box -= 1')
        print('option_checked_count = {}'.format(self.option_checked_count))
        if self.option_checked_count <= 0:
            self.option_checked_count = 0
            self.root_checkbox.setCheckState(Qt.CheckState.Unchecked)
        elif self.option_checked_count >= self.all_option_checkbox_count:
            self.option_checked_count = self.all_option_checkbox_count
            self.root_checkbox.setCheckState(Qt.CheckState.Checked)
        elif self.all_option_checkbox_count > self.option_checked_count > 0:
            self.root_checkbox.setCheckState(Qt.CheckState.PartiallyChecked)

    def update_option_checkbox_state(self, state: Qt.CheckState):
        print('root_checkbox change state to: {}'.format(state))
        # 全选
        if state == Qt.CheckState.Checked:
            for v in self.check_boxes:
                if v.checkState() != Qt.CheckState.Checked:
                    v.setCheckState(Qt.CheckState.Checked)
            if self.option_checked_count >= self.all_option_checkbox_count:
                self.option_checked_count = self.all_option_checkbox_count
        # 全不选
        elif state == Qt.CheckState.Unchecked:
            for v in self.check_boxes:
                if v.checkState() != Qt.CheckState.Unchecked:
                    v.setCheckState(Qt.CheckState.Unchecked)
        # 只选部分
        elif state == Qt.CheckState.PartiallyChecked:
            pass


if __name__ == '__main__':
    app = QApplication()
    ins = MyMultiCheckBox()
    ins.show()
    app.exec()