[SOLVED]Linker error for custom QListModel

wild34

Hi, everybody!

Ive got a disgusting error: @undefined reference to QAbstractItemModel::data(QModelIndex const&, int) const'@
while trying to write custom model that inherits QAbstractListModel :(
Here is the code:

MusicListModel.h
@#include <QAbstractListModel>
#include <QStringList>
#include <QBrush>
#include <QHash>
#include <QAbstractItemModel>
class MusicListModel : public QAbstractListModel
{
Q_OBJECT
public:
explicit MusicListModel(QObject *parent = 0);

bool setData(const QModelIndex &index, const QVariant &value, int role);
QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;

int rowCount(const QModelIndex&) const;

void setNamesList(QStringList &lst);
void setPathesList(QStringList &lst);

private:
QStringList namesList;
QStringList pathesList;
QHash<int, QBrush> color;

};
@

MusicListModel.cpp
@#include "musiclistmodel.h"

MusicListModel::MusicListModel(QObject *parent) :
QAbstractListModel(parent)
{
}

bool MusicListModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
if(index.row() < 0 || index.row() >= nameList.size())
return false;

switch(role)
{
case Qt::DisplayRole:
    nameList.replace(index.row(), value.toString());
    return true;
    break;

case Qt::ToolTipRole:
    if(index.row() >= 0 && index.row() < pathList.size()) {
        pathList.replace(index.row(), value.toString());
        return true;
    }
    return false;
    break;

case Qt::BackgroundRole:
    color.insert(index.row(), QBrush(value.value<QColor>(), Qt::LinearGradientPattern));
    return true;
    break;

default:
    return false;
}

}

QVariant MusicListModel::data(const QModelIndex &index, int role) const
{
if(index.row() < 0 || index.row() >= nameList.size())
return QVariant();

switch(role)
{
case Qt::DisplayRole:
    return namesList.at(index.row()); break;

case Qt::ToolTipRole:
    return pathesList.at(index.row()) ; break;

case Qt::BackgroundRole:
    return color.value(index.row(), QBrush(Qt::white)); break;

default:

===> return QAbstractListModel::data(index, role);
}
}

int MusicListModel::rowCount(const QModelIndex & /&parent/) const
{
return namesList.size();
}
@

I cant understand why this subroutine isnt seen by compiler.
Please, help me to correct it.

wild34

I get a blank QListView when use my model without this function (while model has data in QStringLists) and I thought ListView needs some more roles to be processed.

dbzhang800

Hi, you should have note that, it's a pure virtual member of QAbstractItemModel.
@
QVariant QAbstractItemModel::data(const QModelIndex & index, int role = Qt::DisplayRole) const [pure virtual]
@

BTW, If you do not have a value to return, return an invalid QVariant.

wild34

Oh, it is looking like Im not so good in OOP :) And know a little about virtual methods
Thank you!