Can you please provide an example or something to follow? Because I am still a newbie at both Qt and QML.
Sorry for bothering you with my many questions.
as you can see in the code, I change the state of the delegate through the mouse area in the delegate (it's commented out in the code). I was using it to test the states, now I've noticed another thing; Whenever I collapse the parent Item and then expand it, the previous states are not saved....does this have to do anything with what you mentioned?
In 90% of the cases you can use QStandardItemModel instead of going through the minefield that is subclassing an abstract model.
My advice is just to use that "universal model" instead of a custom one. If you really, really want to customise it as performance of QStandardItemModel is a problem then make sure you run your model through the Model Test (needs just a couple of trivial fixes to work on Qt5) that will tell you if you did everything as you were supposed to or you fell in the countless pitfalls of model subclassing
@6thC did your application consist of a tree and you could apply a delegate to specific items? because that's where I'm stuck now. I am still researching on how to connect QML with C++ and as usual if I figured out a way of applying delegates to specific items based on a logical condition (like your warning and maximum states), I will let you know.
basically now my model controls text color through Qt::ForegroundRole regardless of the application's CSS.
I feel like it's the wrong place to put theming, but it works for me at the moment.
Well... until we decide to have different themes :-°
That did the trick! I also removed the dataChanged() calls and now the operation executes instantly even with thousands of rows. It also seems there aren't any side effects, apart that I have to call again fetchMore() immediately after select(). I can now move on and implement some other batch operations like this without worrying about speed.
You don't actually need to subclass QAbstractItemModel with your current approach. Your QList<SoundObject*> already acts as the model.
In fact, I want to use a QSortFilterProxyModel in C++ to filter what I want to display, and a TableView in QML to enable multiple selection, which is not available in ListView :(
So I had to subclass QAbstractItemModel, and add a custom role that I named "data", which returns the QObject*.
Thank you for everything, I'm going to implement this right away. If I find something useful, I will share it here. And if someone has another idea/vision of how to solve the problem, don't hesitate to share too !