pyqt tree_widget.setItemWidget(root_item, 1, Qlineedit()),设置Qlineedit控件水平居中显示

在PyQt中，可以使用`QTreeWidget`和`QTreeWidgetItem`来创建树形控件。要在`QTreeWidgetItem`中添加自定义控件，可以使用`QTreeWidget.setItemWidget()`方法。

要将`QLineEdit`控件水平居中显示，可以使用`QLineEdit.setAlignment()`方法来设置对齐方式为居中对齐。

以下是示例代码：

from PyQt5.QtWidgets import QApplication, QTreeWidget, QTreeWidgetItem, QLineEdit, QHBoxLayout, QWidget

app = QApplication([])

tree_widget = QTreeWidget()
tree_widget.setColumnCount(2)

root_item = QTreeWidgetItem(tree_widget)
root_item.setText(0, "Root")

line_edit = QLineEdit()
line_edit.setAlignment(Qt.AlignHCenter)  # 设置水平居中对齐

widget = QWidget()
layout = QHBoxLayout(widget)
layout.addWidget(line_edit)
layout.setAlignment(Qt.AlignHCenter)  # 设置水平居中对齐
layout.setContentsMargins(0, 0, 0, 0)
widget.setLayout(layout)

tree_widget.setItemWidget(root_item, 1, widget)

tree_widget.show()

app.exec_()