[Qt-interest] Question about Models, Roles and data

[Arnold Krille]

Hi,

On Tuesday 25 August 2009 20:16:22 André Somers wrote:
> -----Oorspronkelijk bericht-----
>> No, a table is actually a tree with only first-level entries:-) In other
>> words: A tree-model can have as many columns >as needed, the QTreeView or
>> any simpler QTableView (showing only foos or bars) will show the columns.
> I know, but if I understand the question correctly, the OP wanted to show
> only _second_ level entries. Now that may be a problem... AFAIK a
> QTableView can actually operate on any level, not just the first level
> (just like QListView can).

Acting only on the second-level items of one first-level item is possible with 
all views.
Showing only second-level items but from all top-level items at the same time 
calls for a proxy-model.

> Can you really hide top-level nodes with a proxy model
> though while still showing the second level nodes though? I've never tried
> to do that, but I guess it would not be easy.

It is only a matter of getting the indices right. ;-)
The proxy will have to check the number of childs of each first-level item to 
construct the matching list. Not easy but not rocket science either...

Arnold
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