[Qt-interest] Tree and Table view on same model

[Andre Somers]

On 18-5-2010 16:51, Sean Harmer wrote:
> On Tuesday 18 May 2010 15:49:28 Sean Harmer wrote:
>    
>> Hi,
>>
>> On Tuesday 18 May 2010 15:35:04 Jonathan Lee wrote:
>>      
>>> Hi all,
>>>
>>>    not an expert on Qt so I hope this isn't too trivial.
>>>
>>>    I'd like a Tree and Table view on the same model, where
>>>
>>> the tree shows a structure, and the table shows the leaves
>>> of the selected item of the tree.
>>>
>>>    Specifically I have a zip viewer which shows the dirs
>>>
>>> on the left in a tree, and the files in that dir on the
>>> right in a table.
>>>
>>>    Right now I'm doing these two models separately, but
>>>
>>> it seems redundant.
>>>
>>>    What's the usual way of handling this? Make a proxy
>>>
>>> model for both views, using a common model? Or is
>>> there a cleaner way?
>>>        
>> Use a single model on both views. Then when the user clicks on a node (or
>> activates it by some other means) in the tree view call setRootIndex() on
>> your table view so that the table only shows the indexes below that root.
>>
>> See:
>>
>> http://doc.qt.nokia.com/4.7-snapshot/qabstractitemview.html#activated
>> http://doc.qt.nokia.com/4.7-snapshot/qabstractitemview.html#setRootIndex
>>
>> Just connect these together and you are done.
>>      
> Oh as André mentioned you may want to filter out the leaf nodes from the tree
> view by using a proxy model between the source model and the tree view. The
> table view can operate directly on the source model since you are "filtering"
> out the structural nodes by using setRootIndex().
>
> Cheers,
>
> Sean
>
> _______________________________________________
> Qt-interest mailing list
> Qt-interest at trolltech.com
> http://lists.trolltech.com/mailman/listinfo/qt-interest
>
>
>    
Don't you run into problems if you use a model index from a filtered 
model in setRootIndex for a view that operates on an unfiltered model? I 
think you at least need to set the modelindex from the root model 
(obtained with QAbstractProxyModel::mapToSource()) with setRootNode.

This blog http://steveire.wordpress.com/ has some interesting posts 
about such issues.

André