some more details on use of setindex! in ListModels

[Ph0non]

With interest i read your explainations in https://github.com/barche/QML.jl#listmodel and to change data in a ListModel from QML itself. This is exactly what i need for a new feature for my own code.

For editing a TableView i use code from stackoverflow which works fine (see here). This returns (with no surprise) Null setter for role "2016", not changing value because it is only readable.

Like in your example I added setindex! to addrole

addrole(nuclidesModel, year, n -> round(n.values[i],2), setindex!)

(see here and here)

But obviously i miss something, because this results in a segfault

ErrorException("type Float64 has no field values")

[barche]

The problem here is that the standard setindex! will set the entire nuclide for a row. Here, it is a role for a year so I think you need something like this (untested):

addrole(nuclidesModel, year, n -> round(n.values[i],2), (n, newval, row) -> n[row].values[i] = newval)

n is the list of nuclides, row the row in the table (converted to 1-based) and newval is the value for the role, which is one of the years here and so I guess a Float64.

[Ph0non]

Seems to work. I will test later more to see if it fits all. Thanks for you quick response.

It would be a great example for further use of ListModels in ListView and TableView. At least i will make an example for your repo, if this would be fine for you.

[barche]

Sure, more examples are always welcome, feel free to also improve the readme if it lacks clarity.

[ufechner7]

In 0.8 ListModel were removed.