Re: TreeView, How do you know which row is expanded or not?

[Bob Caryl <bob fis-cal com>]

<snip>

> Currrently I just clear everything in the TreeModel in the View then 
> add everything again base on the
> data of the Doc, but this does not preserive which rows were expanded 
> and the user must then
> rexpend them.
>
> How should I keep the rows expanded, while adding/removeing/moving items?
> How can I tell which rows are expanded and not?
<snip>

If you plan on continuing to clear and repopulate your TreeModel 
whenever your Doc changes, then prior to clearing the TreeModel in 
preparation for repopulating, you should make a call to 
TreeModel::get_selected, storing the results in a 
std::vector<Gtk::TreeModel::Path>.  Then iterate the resulting paths to 
record the pertinent data in the rows pointed to by those paths, storing 
it in yet another std::vector<your data type>.  Then, after 
re-population of the TreeModel, iterate all its rows looking for matches 
to the each data item stored in your std::vector and then select and 
expand matching rows as appropriate.

Of course, you could take new data generated in/by your Doc and use the 
TreeStore::append, TreeStore::insert, and TreeStore::erase to modify the 
TreeModel without the necessity for complete repopulation every time the 
Doc changes.  This would also preserve current user selections as well.

Bob Caryl