QTreeView: auto-resize

[d_stranz]

I started playing with this last night. Didn't use a proxy, just derived directly from QAbstractItemModel. Added a QVector of QAbstractItemModel pointers as a member. This vector holds the multiple models managed by the wrapper model. Got it working to the point where I could display the top-level tree (of wrapped model "names") and then expand to one level below that (the actual top-level content of each wrapped model). But I've done something wrong in the index(), parent(), or rowCount() methods because it wants to expand beyond that, and there is nothing in the wrapped models beyond the top level.

I'll play with it some more later, and post code if I get it working.

[papillon]

Thanks, I'd really appreciate it.

[d_stranz]

Ok, I have something working. Code is in the attached zip file. The .pro file was generated from the Qt Visual Studio add-in, so I don't know if it is valid. I use Visual Studio projects with Qt. My VS project file is also in the zip.

The MultiModel class is derived from QAbstractItemModel, and is essentially a tree of tree models. When you add a tree model to it, it wraps the model, and then internally maps model indexes from the MultiModel to model indexes of the wrapped models.

There is a test program which creates multi-level QStandardItemModel trees.

Note that I have not been able to get this working with a QFileSystemModel as one of the wrapped models. If you create a QFileSystemModel and insert it directly into the QTreeView in the demo, everything works fine. If you add the same thing to the MultiModel as a wrapped model, it does not populate the file system tree as expected. There seems to be some differences between the way a QTreeView populates itself vs. the way I am doing it. I haven't dug into the QTreeView code enough to know what's wrong.

Anyway, hope this is enough to get you started. There will probably be methods you will want to add - for example, if one of the wrapped trees changes after it is wrapped, the MultiModel does not update to reflect the differences. To do that, it will need to slots to handle the QAbstractItemModel signals.

MultiModel.zip

[papillon]

d_stranz, thanks so much for kindly providing this source code, much appreciated! I was really stuck...

Tomorrow I will study it and finally be able to use it in my plugin project!