Not able to see plus/tree sign for tree item when build child items dynamically

[prasad_N]

QTreeView::setRootIsDecorated() might help. It is true by default. Did you set it to false somewhere?

No where d_stranz.

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Added after 15 minutes:

The visibility of the tree expansion decoration ⊞ is controlled by the number of children the item has. No children, no indicator. You do not create the children until the first time the data() function is called (on any item for any reason, almost certainly not right). If the view calls hasChildren() or rowCount() before it calls data() then you have no children hence no indicator.
Your model is peculiar to say the least. If you want all the 5000 top level items to have default children then simply create them at construction time and return the vector count() for rowCount().

hmm.. I have a problem with model default implementation (http://www.qtcentre.org/threads/6303...ems?highlight=).

I have a lots of data (millions of rows, probably more than 70 million items which a view can not handle in single page).
hence i have considerable amount of delay (rowCount() calls for all the top level items initially). So decided not to have any calculations rowCount().
if I want to build tree with tree items which is taking considerable amount time as data is in billions.
I can not go for lazy population because I will have problem with scroll bar size then(scroll size will be adjusted as we load data).


So I am looking for a way where I can load data dynamically(with correct scroll bar size at first time only), Any suggestions ??
With the above approach I felt some how I did it but not able to see plus sign even though I could see children with double click on parent.

Thanks a lot.