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QTreeView, QFileSystemModel, QSortFilterProxyModel -> Invalid Filename when try to rename directory

  • Hello !
    When i try to rename a directory in QTreeView - by doubleclick - a Messagebox called "Invalid Filename" pops up. No fileRenamed SIGNAL emitted. (Filename is ok. There are no special characters in the name. ("Test" for example also doesn`t work))
    This only happens when node has been expanded once. When node was not expanded, everything works as expected.
    I use QTreeView, QFileSystemModel with a QSortFilterProxyModel.

    this is what QFileSystemModel `s setData() does:

        if (newName.isEmpty()
            || QDir::toNativeSeparators(newName).contains(QDir::separator())
            || !QDir(filePath(parent(idx))).rename(oldName, newName)) {
    #ifndef QT_NO_MESSAGEBOX
            QMessageBox::information(0, QFileSystemModel::tr("Invalid filename"),
                                    QFileSystemModel::tr("<b>The name \"%1\" can not be used.</b><p>Try using another name, with fewer characters or no punctuations marks.")
    #endif // QT_NO_MESSAGEBOX

    QDir::rename returns false in my case.

    Why does QDir::rename() return false if this node was expanded in QTreeView ???

    Any idears?

  • Lifetime Qt Champion


    What are the old and new names ? Do you have the permissions to modify the files your testing on ?

  • Hello !
    For example: oldname = "Test"; newname = "Test1";
    These are directories ! I have full permission ! Local file system!
    I`m on windows 7 Qt5.5.

    Could it be, that the permission of parents changing, when i expand a node in qtreeview?
    If the node i want to change is collapsed, rename works.
    But was it expanded ONLY ONE TIME, rename doesn`t work anymore.
    That means, it also doesnt work when i collapse an expanded node and try to rename.

  • For example. I have this structure in QTreeView

    - Folder1
         |- Folder11
             |- Folder111

    All nodes are expanded.
    QFileSystemModel readOnly set to false
    Local File System !
    QTreeView is set to AllEditTriggers
    Folders are empty, no files !

    Click on "Folder1" in QTreeView for rename.
    -> For some reason it is not possible to rename "Folder1" ! ! !

  • Lifetime Qt Champion

    Can you share a minimal sample code where you setup the tree view and model to try to reproduce this behaviour ?

  • Hi, does your problem be solved? I found the same problem, confused me for a several days.

  • Exactly the same problem!
    Windows10, Maya Pyside2 (python 2.7 + qt 5.6.1).

    Once the folder is expanded, it is "locked" and model.setData(index, "New Name", Qt.EditRole) fails, although there is no file name conflict.

  • @Jackkkkk
    There are other reports of this on this forum and elsewhere on the web. There are reports in the Qt bug system, but no resolution. I believe you will find it is a Windows (NTFS filing system)-only bug, and is a consequence of the way Windows deals with that filing system combined with QFileSystemModel's creation of a QFileSystemWatcher behind the scenes.

    I suggest you might like to read through, which I presume is the same as your issue. At the very end of the last post there I suggested a possible workaround, but don't know if anyone adopted it. It's not nice, but if the alternative is that rename directory will not work here that is your choice.

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