Hi, it's me again with a new question.

I reimplemented the QAbstractItemModel here is a part of the code:

Code: Select all

QModelIndex BookmarkModel::index(int row, int column, const QModelIndex &parent) const
{
    if (!hasIndex(row, column, parent)) {
        return QModelIndex();
    }

    TreeItem *parentItem;

    if (!parent.isValid()) {
        //it doesn't reach this point
        parentItem = trueParents.first();
    } else
        parentItem = static_cast(parent.internalPointer());

    TreeItem *childItem = parentItem->child(row);
    if (childItem)
        return createIndex(row, column, childItem);
    else
        return QModelIndex();
}

I call this function with this code:

QModelIndex trueParentWithChangedChild = index(0, 0, QModelIndex());

If I call index(0, 0, QModelIndex()) it should give me a pointer to the first entry in my QList: trueParents.first()

But it doesn't.

if (!parent.isValid())

This is answered with no, so this means that QModelIndex() is valid. But why is it valid? I don't understand.

It works with the MenuModel used in System Settings. ( code at websvn.kde.org/trunk/KDE/kdebase/workspace/systemsettings/core/ in MenuModel.cpp )

Try starting with negative numbers instead of "0"'s.