pyqt6 实现QLineEdit的CustomItemDelegate 给QTreeWidget

在PyQt6中，实现自定义item delegate（QLineEdit的CustomItemDelegate）给QTreeWidget通常是为了提供更丰富的交互性和自定义样式。下面是一个简单的步骤示例：

1. 首先，我们需要继承`QStyledItemDelegate`类并实现必要的方法[^1]：

from PyQt6.QtWidgets import QApplication, QMainWindow, QTreeView, QStyledItemDelegate, QLineEdit
from PyQt6.QtCore import Qt

class CustomLineEditDelegate(QStyledItemDelegate):
    def createEditor(self, parent: QWidget, option: QStyleOptionViewItem, index: QModelIndex) -> QLineEdit:
        editor = QLineEdit(parent)
        return editor

    def setEditorData(self, editor: QLineEdit, index: QModelIndex) -> None:
        editor.setText(index.data())

    def setModelData(self, editor: QLineEdit, model: QAbstractItemModel, index: QModelIndex) -> None:
        model.setData(index, editor.text())

    def updateEditorGeometry(self, editor: QLineEdit, option: QStyleOptionViewItem, index: QModelIndex) -> None:
        editor.setGeometry(option.rect)

2. 在主窗口中设置这个自定义delegate到QTreeWidget上：

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        
        # 创建QTreeWidget
        self.tree_view = QTreeView(self)

        # 设置自定义delegate
        delegate = CustomLineEditDelegate()
        self.tree_view.setItemDelegate(delegate)

        # ...其他配置...

if __name__ == '__main__':
    # ...

这样，当用户点击QTreeWidget中的项时，会弹出一个可编辑的LineEdit，显示或编辑其对应的模型数据。