如何在QFileSystemModel中更新文件信息？

首先，这个问题类似于另一个QFileSystemModel，它在文件发生主要变化时不会更新，而不是在这种情况下，我不想每次更新一个文件时都替换整个模型。

在实际示例中，我的应用程序将打开几个文件，因此我基本上只是想了解如何更新一个特定QFileSystemModel项的信息（大小，修改日期），在下面您可以使用一些mcve，例如您可以在该代码中看到我使用setData尝试失败的情况：

import sys
import os

from PyQt5.Qt import *  # noqa


class DirectoryTreeWidget(QTreeView):

    def __init__(self, path=QDir.currentPath(), *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.init_model(path)
        self.expandsOnDoubleClick = False
        self.header().setSectionResizeMode(0, QHeaderView.ResizeToContents)
        self.setAutoScroll(True)

    def init_model(self, path):
        self.extensions = ["*.*"]
        self.path = path
        model = QFileSystemModel(self)
        model.setRootPath(QDir.rootPath())
        model.setReadOnly(False)
        model.setFilter(QDir.AllDirs | QDir.NoDot | QDir.AllEntries)
        self.setModel(model)
        self.set_path(path)

    def set_path(self, path):
        self.path = path
        model = self.model()
        index = model.index(str(self.path))

        if os.path.isfile(path):
            self.setRootIndex(model.index(
                os.path.dirname(str(self.path))))
            self.scrollTo(index)
            self.setCurrentIndex(index)
        else:
            self.setRootIndex(index)


class Foo(QWidget):

    def __init__(self, path):
        super().__init__()

        self.path = path

        self.tree_view = DirectoryTreeWidget(path=".")
        self.tree_view.show()
        bt = QPushButton(f"Update {path}")
        bt.pressed.connect(self.update_file)

        layout = QVBoxLayout()
        layout.addWidget(self.tree_view)
        layout.addWidget(bt)

        self.setLayout(layout)

        # New file will automatically refresh QFileSystemModel
        self.create_file()

    def create_file(self):
        with open(self.path, "w") as f:
            data = "This new file contains xx bytes"
            f.write(data.replace("xx", str(len(data))))

    def update_file(self):
        model = self.tree_view.model()

        # Updating a file won't refresh QFileSystemModel, the question is,
        # how can we update that particular item to be refreshed?
        data = "The file updated is much larger, it contains xx bytes"
        with open(self.path, "w") as f:
            f.write(data.replace("xx", str(len(data))))

        # file_info = self.obj.model.fileInfo(index)
        # file_info.refresh()
        index = model.index(self.path)
        model.setData(index, model.data(index))
        QMessageBox.about(None, "Info", f"{self.path} updated, new size is {len(data)}")


def main():
    app = QApplication(sys.argv)
    foo = Foo("foo.txt")
    foo.setMinimumSize(640, 480)
    foo.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

所以问题是，如何实现update_file更新特定文件的信息foo.txt？

这样做的目的是更新只是文件wihout更换整个模型显示一样这里也曾经是模型更新项目它会是不错的项目不排序/在所有视图移动。