ComboBox and QAbstractListModel

[Dmitry89]

How can I use QAbstractListModel as a model for ComboBox? It works fine with ListView, but when I set it as a model for ComboBox, my application generates the following warning at startup:
ComboBox.qml:510: ReferenceError: modelData is not defined

"textRole" also does not work

[p3c0]

Hi,

Can you post the relevant code ? It is tougher to guess the problem without it.

[Dmitry89]

ComboBox {
            model: ShipsModel
            textRole: name
}

Model:

ShipsModel::ShipsModel(QObject *parent)
     : QAbstractListModel(parent)
 {
 }
 
 int ShipsModel::rowCount(const QModelIndex & parent) const {
     Q_UNUSED(parent);
     return m_data.count();
 }
 
 QVariant ShipsModel::data(const QModelIndex & index, int role) const {
     if (index.row() < 0 || index.row() >= m_data.count())
         return QVariant();
 
     const ShipsItem &item = m_data[index.row()];
     if (role == NameRole)
         return item.name();
     else if (role == SizeRole)
         return item.size();
     return QVariant();
 }
 
 bool ShipsModel::setData(const QModelIndex &index, const QVariant &value, int role)
 {
     ShipsItem *item = &m_data[index.row()];
 
     if (index.isValid() && role == Qt::EditRole) {
         if(index.column()==0){
             item->setName(value.toString());
             emit dataChanged(index, index);
         }
         if(index.column()==1){
             item->setSize(value.toInt());
             emit dataChanged(index, index);
         }
         return true;
     }
     return false;
 }
 
 QHash<int, QByteArray> ShipsModel::roleNames() const {
     QHash<int, QByteArray> roles;
     roles[NameRole] = "name";
     roles[SizeRole] = "size";
     return roles;
 } 

This code works well:

ListView {
      model: ShipsModel
      delegate: TextField {
                text: name
       }
}

[p3c0]

textRole expects a string so it should be "name"

ReferenceError: modelData is not defined would occur when the Combobox is created (and thus model is set) before the model is actually initialized.