复选框取消选中所有其他复选框 [英] Checkbox to uncheck all other checkboxes

问题描述

我正在尝试进行一些验证，以便:

I'm trying to put in some validation such that:

• 当选择a"或选择b"时，无选中"是自动取消选中的
• 选中None Selected"后，Select A" 和Select B" 都会自动取消选中

• When either "Select A" or "Select B" is checked, "None Selected" is automatically unchecked
• When "None Selected" is checked, both "Select A" and "Select B" are automatically unchecked

但是当我运行此代码时，单击任何复选框将取消选中所有 3 个复选框.

But when I run this code, clicking any checkbox will uncheck all the 3 checkboxes.

即窗口初始化并选中未选择".但是当我点击 "Select A" 时，它取消了 "None Selected"，这是预期的，但是 "Select A" 没有得到已检查.

i.e. The window initializes with "None Selected" checked. But when I click "Select A", it unchecks "None Selected", which is intended, but "Select A" doesn't get checked.

我做错了什么?

import sys
import PyQt5

class Test(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        checkBoxNone = QCheckBox("None Selected")
        checkBoxA    = QCheckBox("Select A")
        checkBoxB    = QCheckBox("Select B")

        checkBoxNone.setChecked(True)
        checkBoxNone.stateChanged.connect(lambda checked: (checkBoxA.setChecked(False), checkBoxB.setChecked(False)))
        checkBoxA.stateChanged.connect(lambda checked: checkBoxNone.setChecked(False))
        checkBoxB.stateChanged.connect(lambda checked: checkBoxNone.setChecked(False))

        grid = QGridLayout()

        grid.addWidget(checkBoxNone, 1, 0)
        grid.addWidget(checkBoxA, 2, 0)
        grid.addWidget(checkBoxB, 3, 0)

        self.setLayout(grid)
        self.setWindowTitle('Test')
        self.show()

if __name__ == '__main__':
    if not QApplication.instance():
        app = QApplication(sys.argv)
    else:
        app = QApplication.instance()
    ex = Test()
    sys.exit(app.exec_())

推荐答案

问题是因为根据你的要求，你应该只在某些 QCheckBox 被选中但你不做的情况下做这些选项该验证，为了能够正确处理它，创建一个插槽并知道信号是哪个对象发出的，sender() 方法:

The problem is caused because according to your requirements, you should only make those options if some QCheckBox is checked but you do not do that verification, to be able to handle it properly, create a slot and to know which object the signal was emited, the sender() method:

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

class Test(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.checkBoxNone = QCheckBox("None Selected")
        self.checkBoxA    = QCheckBox("Select A")
        self.checkBoxB    = QCheckBox("Select B")

        self.checkBoxNone.setChecked(True)
        self.checkBoxNone.stateChanged.connect(self.onStateChange)
        self.checkBoxA.stateChanged.connect(self.onStateChange)
        self.checkBoxB.stateChanged.connect(self.onStateChange)

        grid = QGridLayout(self)

        grid.addWidget(self.checkBoxNone, 1, 0)
        grid.addWidget(self.checkBoxA, 2, 0)
        grid.addWidget(self.checkBoxB, 3, 0)
        self.setWindowTitle('Test')
        self.show()

    @pyqtSlot(int)
    def onStateChange(self, state):
        if state == Qt.Checked:
            if self.sender() == self.checkBoxNone:
                self.checkBoxA.setChecked(False)
                self.checkBoxB.setChecked(False)
            elif self.sender() in (self.checkBoxA, self.checkBoxB):
                self.checkBoxNone.setChecked(False)

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