如何在QFileSystemModel中更新文件权限

Question

Is there a way to update a file's permissions in QFileSystemModel (c++)? Prior to allowing a user to rename a file listed in the model using a qtreeview, I make sure the file gets checked out of source control. At this point the file is no longer read only, but the model still believes it's read only. How can I force the model to update a file's permissions without losing the expand / collapse state of the tree?

Thanks!

Update: The file is already flagged as writeable after checking out the file. The Model remains unaware of the change though.

QFile file(path.c_str()); 
QFileDevice::Permissions perms = file.permissions(); 
if (perms & QFile::WriteUser) 
{ 
   // Is already true 
} 

Just to be sure, I went ahead and used

file.setPermissions(file.permissions() | QFile::WriteUser); 

with no luck changing the permissions reported for that file in the model.

Update:

int perms = fsModel->data(index, QFileSystemModel::Roles::FilePermissions).value<int>();
if (perms & QFile::WriteUser)
{
    int i = 0;
}

Note: the above permissions never has the QFile::WriteUser flag set unless the file was writeable before the model was created.

Answer 1

setRootPath() is the key to solving this as well. It seems that you have to call it twice to get it to update the read only permissions. I stumbled across this when I changed my selection code to call:

m_pFileModel->setRootPath("");
m_pFileModel->setRootPath(path.c_str());

everytime an item was selected. Then when I doubleclicked an item, I saw the icon change to checked out. Granted it didn't immediately let me rename it, I had to double click it again, but it does work.

My Process:

Connect to the OnBeginEdit() signal and checkout the file / change permissions

When an item is selected:

m_pFileModel->setRootPath("");
m_pFileModel->setRootPath(path.c_str());

Inside OnBeginEdit()

Do the following TWICE if you didn't set the path to the current folder when the item was selected

m_pFileModel->setRootPath("");
m_pFileModel->setRootPath(path.c_str());

Keep in mind you will have to doubleclick twice or press F2 twice - once to checkout and second to actually change the file.