Drag and Drop on Whitespace of QTreeView

[T1c4L]

Hi everybody,

I read the Drag and Drop with Item views tutorial but somehow, drag drop is only working when im droping on an existing item within the treeview.

How do I drop items on the empty area within a treeview?

thx in advance,
Mike

[janus]

take a look at the function where the dropaction is accepted. Their must be something e.g. that makes the invisible parent item rejecting drops (or something similar).

[T1c4L]

hmm it looks like this:

Qt:ropActions CLTLectionModel::supportedDropActions() const
{
return Qt::CopyAction | Qt::MoveAction;
}

[T1c4L]

how do i drop on the top level of my treeview? do i have to edit my custom model?

[jpn]

Reimplement QAbstractItemModel::flags() to return Qt::ItemIsDropEnabled (together with other flags) for invalid indexes.

[T1c4L]

Hi jpn,

my flags already contain such flags. Do you have any other idea?

Qt::ItemFlags CLTLectionModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::ItemIsEnabled;
 
    return QAbstractItemModel::flags(index) | Qt::ItemIsEditable | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;
}

Qt::ItemFlags CLTLectionModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::ItemIsEnabled;

    return QAbstractItemModel::flags(index) | Qt::ItemIsEditable | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;
}

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[jpn]

I think Qt::ItemIsEnabled for invalid items is pointless. Also, you are not returning Qt::ItemIsDropEnabled for invalid items..