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

[Sean Harmer]

On Tuesday 18 May 2010 15:56:07 Andre Somers wrote:
> 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
> > 
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> 
> 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.

Yes indeed you will need to map the index to the source model.

Sean