Pyqt5 QTreeWIdgetItem，一次选择一个项目复选框答案

【问题标题】：Pyqt5 QTreeWIdgetItem with select one item checkbox at atimePyqt5 QTreeWIdgetItem，一次选择一个项目复选框
【发布时间】：2022-10-14 00:31:09
【问题描述】：

我有一个 QTreeWidget，每个 QTreeWidgetItem 都有 3 个复选框。我想做两件事，但我不知道该怎么做。

用户一次只能选择一个复选框每个 QTreeWidgetItem.So 选择一个给定的复选框 QTreeWidgetItem 应该取消选择其他复选框 QTreeWidgetItem。

给定父 QTreeWidgetItem 复选框的选择/取消选择应该选择/取消选择同一列中的所有子复选框。下面是我的代码：

任何帮助将不胜感激

from PyQt5 import QtWidgets
from PyQt5 import QtCore
from PyQt5 import QtGui
from PyQt5.Qt import Qt
import sys

def main():
    app     = QtWidgets.QApplication(sys.argv)
    tree    = QtWidgets.QTreeWidget()
    tree.resize(500, 200)
    headerItem  = QtWidgets.QTreeWidgetItem()
    item    = QtWidgets.QTreeWidgetItem()
    tree .setColumnCount(4)
    tree .setHeaderLabels(["pluto", "X", "Y", "Z", ""])
    for i in range(3):
        parent = QtWidgets.QTreeWidgetItem(tree)
        parent.setText(0, "Parent {}".format(i))
        parent.setCheckState(1, Qt.Unchecked)
        parent.setCheckState(2, Qt.Unchecked)
        parent.setCheckState(3, Qt.Unchecked)
        #parent.setFlags(parent.flags() | Qt.ItemIsTristate | Qt.ItemIsUserCheckable)
        for x in range(5):
            child = QtWidgets.QTreeWidgetItem(parent)
            child.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
            child.setText(0, "Child {}".format(x))
            child.setCheckState(1, Qt.Unchecked)
            child.setCheckState(2, Qt.Unchecked)
            child.setCheckState(3, Qt.Unchecked)


    tree.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

【问题讨论】：

好吧，您可以先连接到itemChanged 信号来同时执行这两项操作：只要项目/列的checkState() 为Checked，您只需执行任何操作，然后继续取消选中其他兄弟姐妹并检查孩子在该列：这将自动为所有子元素和孙子元素触发相同的操作。
我尝试过执行类似 child.itemChanged.connect(self.boxSelected) 的操作，但出现错误：“AttributeError: 'QTreeWidgetItem' object has no attribute 'itemChanged'”
为什么要连接到该项目？除了物品是不是QObjects（所以它们没有信号），您应该连接到表格小部件的信号。
我已经尝试过 ItemChanged 和 ItemClicked 但它们都只能正确检测到 qtreeWidgetItem 的选择而不是复选框。因此，如果我单击一个项目，然后单击另一个项目的复选框，则 currentItem 始终是我单击的那个而不是我选择的复选框

标签： python pyqt5 qtreewidget qtreewidgetitem

【解决方案1】：

我已经通过使用 itemClicked 解决了我自己的问题。如果有人感兴趣，这是我的解决方案。

from PyQt5 import QtWidgets
from PyQt5 import QtCore
from PyQt5 import QtGui
from PyQt5.Qt import Qt
import sys

class treeManagement:
    def __init__(self):
        app     = QtWidgets.QApplication(sys.argv)
        self.tree    = QtWidgets.QTreeWidget()
        self.tree.resize(500, 200)
        headerItem  = QtWidgets.QTreeWidgetItem()
        item    = QtWidgets.QTreeWidgetItem()
        self.tree .setColumnCount(4)
        self.tree .setHeaderLabels(["pluto", "X", "Y", "Z", ""])
        for i in range(3):
            parent = QtWidgets.QTreeWidgetItem(self.tree)
            parent.setText(0, "Parent {}".format(i))
            parent.setCheckState(1, Qt.Unchecked)
            parent.setCheckState(2, Qt.Unchecked)
            parent.setCheckState(3, Qt.Unchecked)

            for x in range(5):
                child = QtWidgets.QTreeWidgetItem(parent)
                child.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled)
                child.setText(0, "Child {}".format(x))
                child.setCheckState(1, Qt.Unchecked)
                child.setCheckState(2, Qt.Unchecked)
                child.setCheckState(3, Qt.Unchecked)

        self.tree.itemClicked.connect(self.checkboxSelectionChanged)
        self.tree.show()
        sys.exit(app.exec_())

    def checkboxSelectionChanged(self,selectedItem, selectedColumn):
        print(selectedItem.text(0))
        print(selectedColumn)
        # In this method I manage checkbox selected

        if selectedItem is None:
            return


        # 0-The item is unchecked.
        # 1-The item is partially checked. Items in hierarchical models may be partially checked if some, but not all,
        # of their children are checked.
        # 2-The item is checked.

        sumCheckState=selectedItem.checkState(1)+selectedItem.checkState(2)+selectedItem.checkState(3)

        state = QtCore.Qt.Unchecked
        for i in range(1, 4):
            if selectedColumn != i:
                if sumCheckState>=4:#Prevent update if user clicked in the space near checkbox or there's only one
                    # checkbox currently checked in this row
                    selectedItem.setCheckState(i, QtCore.Qt.Unchecked)
            elif selectedItem.childCount() > 0:  # selectedColumn=i
                for j in range(selectedItem.childCount()):
                    child = selectedItem.child(j)
                    for k in range(1, 4):
                        if selectedColumn != k:
                            if sumCheckState >= 4 or (sumCheckState==2 and child.checkState(k)== QtCore.Qt.Checked) :
                                # Prevent update if user clicked in the space near checkbox or there's only one
                               # checkbox currently checked in this row
                              child.setCheckState(k, QtCore.Qt.Unchecked)
                        else:
                               child.setCheckState(k, selectedItem.checkState(selectedColumn))
            elif selectedItem.parent() is not None:
                # I have clicked on a child element so no parent should be in checked state
                if sumCheckState >= 4:#Prevent update if user clicked in the space near checkbox or there's only one
                    # checkbox currently checked in this row
                    for i in range(1, 4):
                        selectedItem.parent().setCheckState(i, QtCore.Qt.Unchecked)

if __name__ == '__main__':
    t=treeManagement()

【讨论】：