QFileSystemModel and custom column / data

[ArnSpin]

I don't know what you mean by this. Explain what you are trying to accomplish where you think you must "modify item and index values".

There are two ways to do what you want. First is to derive from your base model (as you have done). The second is to create a proxy model that adds to what the source model provides. I personally prefer to use a proxy rather than derive from the source model. In either case though, you have to pay careful attention to parent-child relationships with model indexes. For selection to work properly, you also have to make sure that mapToSource() and mapFromSource() are correct.

My apologies, I probably use wrong terms.

I understood that a Treeview is composed by item, each items is characterized by a row, column.
When I use the word index, I just want to say a folder or a file in the QFileSystemModel. It could be an "item" in any other environment but it is not the case in Qt so I used "index" to explain my problem. I will do some research on proxy model.

The easiest way is most likely to have your columns after the ones from the file system model.
So you can always delegate all requests for column < baseColumnCount to the base class and only handle those above yourself.

Would you have a short example. I am not sure to understand clearly how to use delegate here.


Thanks for your helps guys

[anda_skoa]

Would you have a short example. I am not sure to understand clearly how to use delegate here.

Not a delegate in the model/view concept's sense, but delegating the call.

Something like:

int MyModel::columnCount(const QModelIndex &index) const
{
    return QFileSystemModel::columnCount(index) + 2; // two additional columns.
}
 
QVariant data(const QModelIndex &index, int role) const
{
    if (index.column() >= QFileSystemModel::columnCount(index)) {
        // handle custom columns
    } else {
        return QFileSystemModel::data(index, role);
    }
}

int MyModel::columnCount(const QModelIndex &index) const
{
    return QFileSystemModel::columnCount(index) + 2; // two additional columns.
}

QVariant data(const QModelIndex &index, int role) const
{
    if (index.column() >= QFileSystemModel::columnCount(index)) {
        // handle custom columns
    } else {
        return QFileSystemModel::data(index, role);
    }
}

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Cheers,
_