[Interest] Display XML in tree view

[Jason H]

> Sent: Wednesday, August 03, 2016 at 11:26 AM
> From: "Murphy, Sean" <smurphy at walbro.com>
> To: "interest at qt-project.org" <Interest at qt-project.org>
> Subject: Re: [Interest] Display XML in tree view
>
> > Look at Roles. In your case, the displayRole (role 0, default) is "widget" You
> > can add your own roles starting with Qt::UserRole. See roleNames() roles are
> > additional data you can attach to the model items.
> 
> I'm not sure what roles gets me? Since I'm trying to display a read-only 
> representation of the original XML tree structure and just allow the user to 
> expand/collapse nodes they don't really care about, I think I'm ONLY concerned
> about Qt::DisplayRole, since that's what the QTreeView uses to populate the
> widget.
> 
> The "hardest" part of what I needed to do, and I use "hardest" very loosely
> since it wasn't very difficult, was getting the properly formatted raw XML
> string out of the DOM. The issue is there isn't anything in the QDomNode class 
> that produces a QString in the format I want:  the raw XML tag (with the possible 
> caveat of QDomNode::save(), I'm looking at that now).
> 
> So I've modified the DomItem class from the simple DOM model example,
> http://doc.qt.io/qt-5/qtwidgets-itemviews-simpledommodel-example.html, 
> to have a rawXMLTag() function that recreates that raw XML tag from the internal 
> QDomNode. Then in myTreeModel::data() it's trivial to call DomItem::rawXMLTag()
> when role == Qt::DisplayRole.
> 
> My understanding of the usefulness of Qt::UserRole is if I wanted to pass 
> other data around that is visually hidden from the user, but is would still 
> be accessible when connecting slots to signals like
>   QAbstractItemView::clicked()
> But in my case, I don't have any need to pass around other data, I only care 
> about showing that original XML tag.
> 
> Or am I missing the point of what you're saying?


That's all right. I wasn't sure if you wanted to display "widget" or something else. Something you write previously made me think that might not be what you wanted.