treeview with multiple models

[BreakBad]

I would like to concatenate multiple models into one tree view. When an index is selected in this treeview, I would like to be able to know what 'sub'model was selected and what index of that 'sub'model was selected.

# example data
Model1
data1
   child 1
   child 2
 
Model2:
data2
   child 1
   child 2
 
Treeview:
data 1
   child 1
   child 2
data 2
   child 1
   child 2

# example data
Model1
data1
   child 1
   child 2

Model2:
data2
   child 1
   child 2

Treeview:
data 1
   child 1
   child 2
data 2
   child 1
   child 2

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Purpose: If I clicked on child 2 of data 2, I would like to be able to call setModel(Model2) and setRootIndex(???) on a QTableView which I have set up as an editor.


If I implement a proxy view, what modifications do I need to make? See below:

QSortFilterProxy or QAbstractProxyModel?
 
   data(): how do I know which model was clicked?
   index(): how do I know which model to use?
   parent(): ?
   mapToSource(): ? 
   mapFromSource(): ? 
   rowCount(): sum of rowCount from all models
   columnCount(): 1

QSortFilterProxy or QAbstractProxyModel?

   data(): how do I know which model was clicked?
   index(): how do I know which model to use?
   parent(): ?
   mapToSource(): ? 
   mapFromSource(): ? 
   rowCount(): sum of rowCount from all models
   columnCount(): 1

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I'm thinking the key is in mapToSource/mapFromSource and having to count what row your on. Eg: If Model 1 has 10 rows and you are on row 12, and Model 2 as 10 rows, then you are requesting row 2 from model 2. Is this how it's done or is there a more elegant approach?

TYVM,

BB