very simple custom DataModel derived from bb::cascades:DataModel will not display data in ListView

Hello

A model of custom data in C++, I did nothing appears in a ListView

It seems that the link

listView.dataModel = _dataModel

on QML side don't ask the DataModel data. I'm not really sure what I'm doing wrong.

PS. Place the CustomDataModel in QML as an attachedObject and insert data it works, but I have a specific need to keep the DataModel in C++.

Below the example of code reduced to the simplest case which cause me problem:

//customdatamodel.h

#include 
#include 
#include 

class CustomDataModel : public bb::cascades::DataModel
{
Q_OBJECT
  public:
    CustomDataModel(QObject * parent=0) : bb::cascades::DataModel(parent)
    {
    }
    virtual void ~CustomDataModel()
    {
    } 

    virtual int CustomDataModel::childCount(const QVariantList& indexPath)
    {   //just one level deep
        return 0;
    }

    virtual bool CustomDataModel::hasChildren(const QVariantList& indexPath)
    {
        return childCount(indexPath) > 0;
    }

    virtual QVariant CustomDataModel::data(const QVariantList& indexPath)
    {
        if (indexPath.count() == 1)
        {
            return m_values[indexPath[0].toInt()];
        }
        return QVariant();
    }

    void CustomDataModel::insert(const QVariantMap &item)
    {
         m_values.append(item);
         emit itemAdded(QVariantList() << m_values.count()-1);
    }

    private:
      QVariantList m_values;
}

//application.cpp

ApplicationUI::ApplicationUI(bb::cascades::Application *app)
: QObject(app)
{
    qmlRegisterType("app.datamodels", 1,0, "CustomDataModel");
    QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);

    CustomDataModel *dataModel = new CustomDataModel(this);

    QVariantMap map;
    map["field"] = "value1";
    dataModel->insert(map);

    map = QVariantMap();
        map["field"] = "value2";
    dataModel->insert(map);

    map = QVariantMap();
    map["field"] = "value3";
    dataModel->insert(map);

    qml->setContextProperty("_dataModel", dataModel);

    AbstractPane *root = qml->createRootObject();
    app->setScene(root);
}

//main.qml

    Page {
        Container {
            layout: DockLayout {
            }

            ListView {
                id:listView
                dataModel: _dataModel

                function itemType(data, indexPath)
                {
                    if (indexPath.length == 1)
                    {
                        return "item";
                    }
                }

                listItemComponents: [

                    ListItemComponent {
                        type: "item"
                        StandardListItem {
                            title: ListItemData.field
                        }
                    }
                ]
            }
        }
    }

Hello
You always return a zero childCount, so he thinks that the template is empty.

Tags: BlackBerry Developers

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