QDirModel, Model/View, extend the file onfo

[VlJE]

I need an approach to extend the file information (insert Column?) given in the QDirModel with my own file-specifical information. If I can do it ny subclassing of QDirModel or I should programm my own file model by subclassing the abstract model?
Or it is enough to overwrite columnCount function and add someway the additional information direct to the View (Ex. QTreeView)?
I display the list of files, make an operation on the files and would like to display the status of the operation (Text) and the result near the file. I should have the possibility for the father access of the status information.

[wysota]

I think the best and most straightforward way is to subclass QDirModel and extend it with the columns you need.

[VlJE]

The Question is, how to do it.
Use derivered from the abstract item model "insertColumn" or overwrite columnCount or how? I don't understand how the file data is stored in the QDirModel. I suppose the tree based on the QDir Output.

[wysota]

Reimplement columnCount() and data() (and maybe also index()) to support your additional columns.

[VlJE]

ColomnCount is easy but the others...
I solved the problem by using my own FileModel class.

[wysota]

ColomnCount is easy but the others...

Others what? If you add columns, you only have to reimplement columnCount() and data(). In data you can call QDirModel::data() for the original columns and return appropriate data for your own columns.

[VlJE]

My additional columns are the operation result string and the operation result state.
In the case of your solution I have to care about the map FileName/Operation result.
If the processing ramains fast enought by 10000 Files in my directory...

[wysota]

You have to keep the data somewhere anyway if you can't create the data on the fly. Just access and return it from within data(), just like QDirModel does.

[VlJE]

I have 1 container instead of 2 and I don't care to synchronise theese container

[wysota]

In what way is it related to the problem?

[VlJE]

By using QDirModel "You have to keep the data somewhere anyway if you can't create the data on the fly. Just access and return it from within data(), just like QDirModel does".
Also I have to care about "somewhere" for each processed file. It ist the 1. Container.
QDirModel hat it's own hidden 2. File container (or tree...).
By overwritig of Data() I have to merge the file info of QDirModel and the additional file info in "somewhere".
It was more effectiv in my case to create my own FileModel with 1 File-Container for all the file data, the additional file data inclusive.