treeview with multiple models

**BreakBad** · 24th July 2012, 19:56

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.

Qt Code:

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# 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:

Qt Code:

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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

**amleto** · 25th July 2012, 00:40

an QAbstractProxyModel can still only have one model!

Probably your best bet is to make another model that is a composition of your individual models.

**Santosh Reddy** · 25th July 2012, 07:31

If you cannot change the mode 1 and model 2, then your approach for proxy model sounds ok. The better solution would be to have all the indexes (all 20 rows) in a single model.

**BreakBad** · 25th July 2012, 13:06

Thanks for the replies!

The only reason I cannot have the data in a single model is because those models are being used elsewhere and I require the data in all my views to be sync'd.

I did finally find an example in the following thread which I will be exploring: http://www.qtcentre.org/threads/4534...ght=multimodel