Is there any signal to notify once all the items of the list are loaded?

darpita_7

Hi,
I am making a sample list, and adding button to it form my .cpp

ListView
 {
   id: list
   width: 180; height: 200
   delegate: Button
     {
         width: 180; height: 40
         //assigning few properties
     }
}

From my .cpp I am clearing the list and again adding items. Is there any signal that I can check every time the list is refreshed, and all items are added successfully?
Also what is the order of property update of list button and list view.

p3c0

@darpita_7 I think you can check that in onCountChanged handler. If count equals to model's count then all are loaded.

darpita_7

I am not getting the onCountChanged signal in my qml

p3c0

@darpita_7 Did you add it inside ListView ?

darpita_7

@p3c0
Yes i added it inside the list view

p3c0

@darpita_7 That is strange. Can you post an example ?

Viet

I don't see any model ?

darpita_7

@Viet yes, so i am adding the button to the model, and assigning the model in cpp.
Then i am clearing the same model.

p3c0

@darpita_7 Can you post a small example ?

Viet

Were you using QAbstractListModel then?
If so, you also have to notify the view about the change in C++ (ex: use beginInsertRows(), endInsertRows() etc)

darpita_7

@Viet
void modifying_list()
{
QAbstractListModel _model;
QQuickItem* list = findChild("list");
if(list)
{
list->setProperty("model",QVariant::fromValue(&_model));
}

_model.beginInsertRows(x,y,z); //adding some data here, where x,y,z are the expected values
endInsertRows();
//once added trying to clear the list

_model.beginRemoveRows(x,y,z);// trying to remove the added items,
_model.endRemoveRows();
}

This is just a sample code.

Viet

The _model will be deleted once it gets out of scope !
Other than that I don't see anything wrong here.

p3c0

@Viet Also QAbstractListModel is supposed to be subclassed and not used directly.

QAbstractListModel provides a standard interface for models that represent their data as a simple non-hierarchical sequence of items. It is not used directly, but must be subclassed.