[Interest] Display XML in tree view

[Murphy, Sean]

> > I'm assuming this solution already exists, but either my google-fu isn't
> working today, or it doesn't: I'd like to display an XML in a tree view, much
> like many XML editing software applications do. All I'm looking for is display
> the raw XML in a read-only tree view, but have the nodes be hierarchical so
> that while looking at the XML, I can collapse/expand nodes.
> >
> > I have to believe this is already out there, but I'm just not stumbling across
> it...
> 
> I don't think anything exists already. TreeViews sure, XML sure. Combining
> the two though, no.  But I don't think it would be hard. Qt's model/view
> system should make it trivial. The only decisions are:
> 1. Stream Reader interface or classic DOM parsing (both supported by Qt)
> 2. Arrange the data as columns or roles.
> 
> Once you have your model and parsing, then you can use it in a QTreeView.

Yeah, I wasn't able to find what I wanted exactly, but the DOM model example,
http://doc.qt.io/qt-5/qtwidgets-itemviews-simpledommodel-example.html, was
really close to what I wanted. I just changed it to having only one column and then
modifying what was written out. The DOM structure was great for generating the
tree relationships between nodes. 

My only complaint is once it's in the DOM the raw XML tag is lost, which is all I 
want to display. Again, correct me if I'm just missing something obvious, I'm 
pretty new to DOM. But if the original XML tag was:
  <widget class="QWidget" name="centralWidget">
that's exactly what I'd want to display, just with the expand/collapse arrow next
to it. I'm not trying to actually parse and understand the data in the XML, I just want
to display the XML node structure in the UI. But it seems that DOM is a little too 
aggressive for my needs when parsing, and breaks up that tag into:
  QDomNode::nodeName() // which just returns "widget"
  QDomNode::attributes() // returns a map of attributes that has to be parsed

Obviously it wasn't too hard to build up a string that puts things back the way they
were, but I was surprised that doesn't exist already. Or maybe I need to dig a little 
more? I just stumbled across http://doc.qt.io/qt-5/qdomnode.html#save which
might do exactly what I need. Off to try to it now...

Sean