Select all files [QTableView et QFileSystemModel]

Hi!

I need to select all files from a QTableView, which has for model a QFileSystemModel.
The problem is that my QTableView displays the files and folders, so i need to select only the files.

This following Qt function selects the files and folders : it's why I cannot use it directly.

Code:

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tableView->selectAll();

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I have written a function which parse all elements from a QTableView and selects only the files.

Code:

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//I get the modelIndex root
QModelIndex rootIndex = tableView->rootIndex();     
//If the model is not valid, i cancel
if(false == rootIndex.isValid())
           return;     
//I parse all lines from my root directory
for(int i = 0 ; i < fileSystemModel->rowCount(rootIndex) ; i++)   
{
           //I get the current line
           QModelIndex currentIndex = fileSystemModel->index(i, 0, rootIndex);
           //If the current modelIndex is valid, i continue
           if(true == currentIndex.isValid())
                   //If the current modelIndex is not a directory
                   if(false == fileSystemModel->fileInfo(currentIndex).isDir())
                           //If the current modelIndex is not already selected
                           if(false == tableView->selectionModel()->isSelected(currentIndex))
                                   //I select it
                                   tableView->setCurrentIndex(currentIndex);
}

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This code seems ok. But, when i select a lot of files (for example 600), this function is very very slow...
It's much more slow than tableView->selectAll().

Have you got a solution to :
- optimize my function?
- or a easier way to select all files?

I thank you in advance!