[Qt-interest] QTreeView requests row == -1 in index function of model

[Егор Попов]

Hi, everyone!

I have self-written model. It represents complex data structure. It's a tree
with tables on leaves.

Such that:

Root (TreeItem)
 |
 +-Section 1 (TreeItem)
 |
 +-Section 2 (TreeItem)
    |
    +-Factory (DataItem)
    |  |
    |  +-TableData (TableItem)
    |     |
    |     +- Cell Cell Cell (BaseItem)
    |     |
    |     +- Cell Cell Cell (BaseItem)
    |
    +-Factory (DataItem)

All vertices of tree stored in exemplar of class derived from BaseItem. In
index(), parent(), rowCount() etc. I do:

...
    BaseItem* item = static_cast<BaseItem*>(index.internalPointer);
    if (dynamic_cast<TreeItem*>(item)) {
        ...
    }

    if (dynamic_cast<TableItem*>(item)) {
        ...
    }

    if (dynamic_cast<BaseItem*>(item)) {
        ...
    }
...

to recognize what kind of item I have.

I think that rowCount() and columnCount() works right, but than I expand
"Section 2" branch of treeView QTreeView ask my index function for item with
row == -1.

P.S. Exuse me for my English.
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