PyQt [QTreeWidget]：如何為項目添加單選按鈕？

Question

對於這個問題，我指的是@Andy PyQt Tree Widget的答案，添加了用於動態刪除的復選框

@Andy那里展示了如何將CheckBox添加到QTreeWidget ，這很完美。

我想在這里問，如何將RadioButton添加到QTreeWidget ？ ----而且，對我來說更困難的是，盡管它們處於不同的groups ，如何僅使一項可供選擇？

我將代碼從@Andy重寫為PyQt5：

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

def main(): 
    app     = QApplication (sys.argv)
    tree    = QTreeWidget ()
    headerItem  = QTreeWidgetItem()
    item    = QTreeWidgetItem()

    for i in range(3):
        parent = QTreeWidgetItem(tree)
        parent.setText(0, "Parent {}".format(i))
        parent.setFlags(parent.flags() | Qt.ItemIsTristate | Qt.ItemIsUserCheckable)
        for x in range(5):
            child = QTreeWidgetItem(parent)
            child.setFlags(child.flags() | Qt.ItemIsUserCheckable)
            child.setText(0, "Child {}".format(x))
            child.setCheckState(0, Qt.Unchecked)
    tree.show() 
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

上面代碼的運行結果：

更新：所需的結果應如下所示...

任何幫助將不勝感激！ 謝謝！

Answer 1

如果要建立一個QRadioButton並在組中排他，則可能的解決方案是實現一個委托，在此委托中，我們將覆蓋paint方法以繪制QRadioButton和editorEvent方法以捕獲click事件並更改狀態其他項目視情況而定。

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


class Delegate(QStyledItemDelegate):
    def paint(self, painter, option, index):
        if not index.parent().isValid():
            QStyledItemDelegate.paint(self, painter, option, index)
        else:
            widget = option.widget
            style = widget.style() if widget else QApplication.style()
            opt = QStyleOptionButton()
            opt.rect = option.rect
            opt.text = index.data()
            opt.state |= QStyle.State_On if index.data(Qt.CheckStateRole) else QStyle.State_Off
            style.drawControl(QStyle.CE_RadioButton, opt, painter, widget)

    def editorEvent(self, event, model, option, index):
        value = QStyledItemDelegate.editorEvent(self, event, model, option, index)
        if value:
            if event.type() == QEvent.MouseButtonRelease:
                if index.data(Qt.CheckStateRole) == Qt.Checked:
                    parent = index.parent()
                    for i in range(model.rowCount(parent)):
                        if i != index.row():
                            ix = parent.child(i, 0)
                            model.setData(ix, Qt.Unchecked, Qt.CheckStateRole)

        return value


def main():
    app = QApplication(sys.argv)
    tree = QTreeWidget()
    tree.setItemDelegate(Delegate())

    for i in range(3):
        parent = QTreeWidgetItem(tree)
        parent.setText(0, "Parent {}".format(i))
        for x in range(5):
            child = QTreeWidgetItem(parent)
            child.setFlags(child.flags() | Qt.ItemIsUserCheckable)
            child.setText(0, "Child {}".format(x))
            child.setCheckState(0, Qt.Unchecked)

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


if __name__ == '__main__':
    main()