PyQt:如何在TreeWidget中的特定位置获取项？

from PyQt5.QtWidgets import QApplication, QTreeWidget, QTreeWidgetItem, QMainWindow

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

        tree_widget = QTreeWidget(self)
        tree_widget.setColumnCount(2)
        tree_widget.setHeaderLabels(['Name', 'Value'])

        # 添加一些示例项
        root_item = QTreeWidgetItem(tree_widget, ['Root', ''])
        child_item1 = QTreeWidgetItem(root_item, ['Child 1', 'Value 1'])
        child_item2 = QTreeWidgetItem(root_item, ['Child 2', 'Value 2'])
        grandchild_item = QTreeWidgetItem(child_item2, ['Grandchild', 'Value 3'])

        # 获取特定位置的项
        item = tree_widget.itemAt(100, 100)  # 假设坐标为(100, 100)
        if item is not None:
            print('Item text:', item.text(0))
            print('Item value:', item.text(1))
        else:
            print('No item found at the specified position.')

        self.setCentralWidget(tree_widget)

if __name__ == '__main__':
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()