Adding new items to model (MVC)

**Urvin** · 2nd November 2010, 08:21

Hello!
I've created my own model, that bases on Blanchet-Summerfield methon from all-known book.
So, I have an Node object. Every Node has a pointer to parent node and a list of child node. Model has the "main Root Node", which parent == 0 ad child are the needed model's nodes.
The "main Root Node" doesn't appear in view, only its nodes:

Qt Code:

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RootNode - invisiple
--Node1
----Node1.1
----Node1.2
--Node2
--Node3

RootNode - invisiple
--Node1
----Node1.1
----Node1.2
--Node2
--Node3

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At first time I fill this model by data using beginResetModel and endResetModel functions.
But there are cases, when I want to add a few nodes into the model, but don't want to reset it whole. Additionaly, I use a proxy sorting model.

Reading Qt help I see that I should use beginInsertRows and endInsertRows functions. The problem is that functions have a QModelIndex parameter - parent node.
I don't use QModelIndex at all!
To know node class from QModelIndex presented I use this construction, as written in the book:

Qt Code:

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tUMClientsNode *lNode = static_cast<tUMClientsNode*>(aParent.internalPointer());

tUMClientsNode *lNode = static_cast<tUMClientsNode*>(aParent.internalPointer());

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tUMClientsNode - my node class, aParent - QModelIndex.

What should I do to get QModelIndex from my Node? How to use beginInsertRows correctly?

To add a single item I use similar code now:

Qt Code:

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void tUMClientsModel::AddNewClient(tUMDCClientInfo &aNewClient, bool aUseBeginInsert)
{
    if (aNewClient.fClientParentID == 0)
        fRootNode->fChildrenList.append(new tUMClientsNode(fRootNode, aNewClient));
    else
        for (int i = 0; i < fRootNode->fChildrenList.count(); i++)
            if (fRootNode->fChildrenList[i]->fClientInfo.fClientID == aNewClient.fClientParentID)
            {
                fRootNode->fChildrenList[i]->fChildrenList.append(
                        new tUMClientsNode(fRootNode->fChildrenList[i], aNewClient)
                        );
                break;
            }
}

void tUMClientsModel::AddNewClient(tUMDCClientInfo &aNewClient, bool aUseBeginInsert)
{
    if (aNewClient.fClientParentID == 0)
        fRootNode->fChildrenList.append(new tUMClientsNode(fRootNode, aNewClient));
    else
        for (int i = 0; i < fRootNode->fChildrenList.count(); i++)
            if (fRootNode->fChildrenList[i]->fClientInfo.fClientID == aNewClient.fClientParentID)
            {
                fRootNode->fChildrenList[i]->fChildrenList.append(
                        new tUMClientsNode(fRootNode->fChildrenList[i], aNewClient)
                        );
                break;
            }
}

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Thank you!