QAbstractTableModel EDITABLE ERASES current value when editable is invoked

I created a TableModel which extends QAbstractTableModel and whenever I double click inside a cell to edit it, if it has a current value, that value gets erased, I've tried overwriting the double click signal and resetting the value, but that didn't help.

I've included all the files I'm using.

model.h
http://pastebin.com/V7VJAuCJ

model.cpp
http://pastebin.com/zPjSViFQ

MainWindow.h
http://pastebin.com/kGGp06zH

MainWindow.cpp
http://pastebin.com/wuRaQ3eE


Model.cpp

Code:

---

#include <QtGui>
 
#include "model.h"
#include <QDebug>
 
/*!
    Constructs a table model with at least one row and one column.
*/
 
TableModel::TableModel(int rows, int columns, QObject *parent)
    : QAbstractTableModel(parent)
{
    QStringList newList;
 
    for (int column = 0; column < qMax(1, columns); ++column) {
        newList.append("");
    }
 
    for (int row = 0; row < qMax(1, rows); ++row) {
        rowList.append(newList);
    }
}
 
 
/*!
    Returns the number of items in the row list as the number of rows
    in the model.
*/
 
int TableModel::rowCount(const QModelIndex &/*parent*/) const
{
    return rowList.size();
}
 
/*!
    Returns the number of items in the first list item as the number of
    columns in the model. All rows should have the same number of columns.
*/
 
int TableModel::columnCount(const QModelIndex &/*parent*/) const
{
    return rowList[0].size();
}
 
/*!
    Returns an appropriate value for the requested data.
    If the view requests an invalid index, an invalid variant is returned.
    Any valid index that corresponds to a string in the list causes that
    string to be returned for the display role; otherwise an invalid variant
    is returned.
*/
 
QVariant TableModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();
 
    if (role == Qt::DisplayRole)
        return rowList[index.row()][index.column()];
    else
        return QVariant();
}
 
/*!
    Returns the appropriate header string depending on the orientation of
    the header and the section. If anything other than the display role is
    requested, we return an invalid variant.
*/
 
QVariant TableModel::headerData(int section, Qt::Orientation orientation,
                                int role) const
{
    if (role != Qt::DisplayRole)
        return QVariant();
 
    if (orientation == Qt::Horizontal)
        return QString("Column %1").arg(section);
    else
        return QString("Row %1").arg(section);
}
 
/*!
    Returns an appropriate value for the item's flags. Valid items are
    enabled, selectable, and editable.
*/
 
Qt::ItemFlags TableModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::ItemIsEnabled;
 
    return Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsEditable;
}
 
/*!
    Changes an item in the model, but only if the following conditions
    are met:
 
    * The index supplied is valid.
    * The role associated with editing text is specified.
 
    The dataChanged() signal is emitted if the item is changed.
*/
 
bool TableModel::setData(const QModelIndex &index,
                         const QVariant &value, int role)
{
    if (!index.isValid() || role != Qt::EditRole)
        return false;
 
    qDebug()<< value.toString();
    rowList[index.row()][index.column()] = value.toString();
    emit dataChanged(index, index);
    return true;
}
 
/*!
    Inserts a number of rows into the model at the specified position.
*/
 
bool TableModel::insertRows(int position, int rows, const QModelIndex &parent)
{
    int columns = columnCount();
    beginInsertRows(parent, position, position + rows - 1);
 
    for (int row = 0; row < rows; ++row) {
        QStringList items;
        for (int column = 0; column < columns; ++column)
            items.append("");
        rowList.insert(position, items);
    }
 
    endInsertRows();
    return true;
}
 
/*!
    Inserts a number of columns into the model at the specified position.
    Each entry in the list is extended in turn with the required number of
    empty strings.
*/
 
bool TableModel::insertColumns(int position, int columns, const QModelIndex &parent)
{
    int rows = rowCount();
    beginInsertColumns(parent, position, position + columns - 1);
 
    for (int row = 0; row < rows; ++row) {
        for (int column = position; column < columns; ++column) {
            rowList[row].insert(position, "");
        }
    }
 
    endInsertColumns();
    return true;
}
 
/*!
    Removes a number of rows from the model at the specified position.
*/
 
bool TableModel::removeRows(int position, int rows, const QModelIndex &parent)
{
    beginRemoveRows(parent, position, position + rows - 1);
 
    for (int row = 0; row < rows; ++row) {
        rowList.removeAt(position);
    }
 
    endRemoveRows();
    return true;
}
 
/*!
    Removes a number of columns from the model at the specified position.
    Each row is shortened by the number of columns specified.
*/
 
bool TableModel::removeColumns(int position, int columns, const QModelIndex &parent)
{
    int rows = rowCount();
    beginRemoveColumns(parent, position, position + columns - 1);
 
    for (int row = 0; row < rows; ++row) {
        for (int column = 0; column < columns; ++column) {
            rowList[row].removeAt(position);
        }
    }
 
    endRemoveColumns();
    return true;
}

---

model.h

Code:

---

#ifndef MODEL_H
#define MODEL_H
 
#include <QAbstractTableModel>
#include <QStringList>
#include <QVariant>
 
class TableModel : public QAbstractTableModel
{
    Q_OBJECT
 
public:
    TableModel(int rows = 1, int columns = 1, QObject *parent = 0);
 
    int rowCount(const QModelIndex &parent = QModelIndex()) const;
    int columnCount(const QModelIndex &parent = QModelIndex()) const;
    QVariant data(const QModelIndex &index, int role) const;
    QVariant headerData(int section, Qt::Orientation orientation,
                        int role = Qt::DisplayRole) const;
 
    Qt::ItemFlags flags(const QModelIndex &index) const;
    bool setData(const QModelIndex &index, const QVariant &value,
                 int role = Qt::EditRole);
 
    bool insertRows(int position, int rows, const QModelIndex &parent = QModelIndex());
    bool insertColumns(int position, int columns, const QModelIndex &parent = QModelIndex());
    bool removeRows(int position, int rows, const QModelIndex &parent = QModelIndex());
    bool removeColumns(int position, int columns, const QModelIndex &parent = QModelIndex());
 
private:
    QList<QStringList> rowList;
};
 
#endif

---

Your model data() function returns a null QVariant for the EditRole and that is the value that Qt gives to the default editor.