Flat data source for QTreeView/Model

[mawt]

Greetings

I've made serveral attempts but im failing big time. I last tried this serveral months ago, only to simply give up and work on some library code.

I want a make a persistant TreeView widget across a network conection. To do that, I need to use a 'flat source' (ie: QTableView data), to provide an initial update, and successive edits/drag + drop operations. The easiest data source is a flat source because its serializable and diff'able.

I've tried field delegates that alter a foreign source and an sql backend that doesn't fire change events etc.

My problem is that I can't seem to find a "one model fits all" backend to both QTreeModel and QTableModels. I've been able to successfully build a tree from a flat source using pointer and non-pointer methods, but both mean I create an in memory tree stucture, which is hard to update/alter.

My data is something along the lines of:

QVector<QVariant*> headerData;
    headerData << new QVariant(tr("Display"));
    headerData << new QVariant(tr("Name"));
    headerData << new QVariant(tr("Parent"));
    rootItem = new TreeItem(headerData);
 
    QVector<QVariant *> rootNodeData;
    rootNodeData << new QVariant(tr("This is the root node"));
    rootNodeData << new QVariant(tr("ROOT"));
    rootNodeData << new QVariant(tr("."));
 
    rootItem->insertChildren(rootItem->childCount(), 1, rootNodeData);
    rootNode = rootItem->child(0);

QVector<QVariant*> headerData;
    headerData << new QVariant(tr("Display"));
    headerData << new QVariant(tr("Name"));
    headerData << new QVariant(tr("Parent"));
    rootItem = new TreeItem(headerData);

    QVector<QVariant *> rootNodeData;
    rootNodeData << new QVariant(tr("This is the root node"));
    rootNodeData << new QVariant(tr("ROOT"));
    rootNodeData << new QVariant(tr("."));

    rootItem->insertChildren(rootItem->childCount(), 1, rootNodeData);
    rootNode = rootItem->child(0);

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Some sample data

TreeData * r1 = new TreeData();
    r1->setString("Display", "Display txt");
    r1->setString("Name", "Parent1");
    r1->setString("Parent", "ROOT");
 
    TreeData * r2 = new TreeData();
    r2->setString("Display", "this is parent 2");
    r2->setString("Name", "Parent2");
    r2->setString("Parent", "ROOT");
 
    TreeData * c1 = new TreeData();
    c1->setString("Display", "First child");
    c1->setString("Name", "Child1");
    c1->setString("Parent", "Parent1");
 
    TreeData * c2 = new TreeData();
    c2->setString("Display", "This is the child of child1");
    c2->setString("Name", "Child2");
    c2->setString("Parent", "Child1");
 
    QVector<TreeData*> treeDataVec;
    treeDataVec << r1;
    treeDataVec << r2;
    treeDataVec << c1;
    treeDataVec << c2;

TreeData * r1 = new TreeData();
    r1->setString("Display", "Display txt");
    r1->setString("Name", "Parent1");
    r1->setString("Parent", "ROOT");

    TreeData * r2 = new TreeData();
    r2->setString("Display", "this is parent 2");
    r2->setString("Name", "Parent2");
    r2->setString("Parent", "ROOT");

    TreeData * c1 = new TreeData();
    c1->setString("Display", "First child");
    c1->setString("Name", "Child1");
    c1->setString("Parent", "Parent1");

    TreeData * c2 = new TreeData();
    c2->setString("Display", "This is the child of child1");
    c2->setString("Name", "Child2");
    c2->setString("Parent", "Child1");

    QVector<TreeData*> treeDataVec;
    treeDataVec << r1;
    treeDataVec << r2;
    treeDataVec << c1;
    treeDataVec << c2;

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Recursively populate children by "Parent" <-> "Name"

foreach (TreeData * td, treeData)
    {
        QString parentName = QString(td->getString("Parent").c_str());
 
        TreeItem * currentRoot = recursiveFindByName(parentName, rootNode);
        if (!currentRoot)
            currentRoot = rootNode;
 
        QString thisNodeName = currentRoot->data(1).toString();;
 
        QVector<QVariant*> data;
        data << new QVariant(QString(td->getString("Display").c_str()));
        data << new QVariant(QString(td->getString("Name").c_str()));
        data << new QVariant(QString(td->getString("Parent").c_str()));
 
        currentRoot->insertChildren(currentRoot->childCount(), 1, data);
    }

foreach (TreeData * td, treeData)
    {
        QString parentName = QString(td->getString("Parent").c_str());

        TreeItem * currentRoot = recursiveFindByName(parentName, rootNode);
        if (!currentRoot)
            currentRoot = rootNode;

        QString thisNodeName = currentRoot->data(1).toString();;

        QVector<QVariant*> data;
        data << new QVariant(QString(td->getString("Display").c_str()));
        data << new QVariant(QString(td->getString("Name").c_str()));
        data << new QVariant(QString(td->getString("Parent").c_str()));

        currentRoot->insertChildren(currentRoot->childCount(), 1, data);
    }

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But this isn't very drag and drop friendly. What I really need is to use a model proxy. Can someone provide an example of this? Does it reduce down to a flat source that I can simply assign to a QTableView and alter in realtime, with the updates reflected in the Tree heirarchy?

Thanks

mawt

[wysota]

Aren't you duplicating what QStandardItemModel can already do?