model/view call setdata() function help?

What I'm trying to do is use a button in a dialog to add the struct data(XianStruct) in a reimplemented QAbstractListModel that is shown through a QTableView.
but I dont know how to call setData() function ? QTableView not refreshing after push the add button?

thanks! I have the data function as follows:

//Dialog.h
Model *ModelData;
//Dialog.cpp

ModelData = new Model(this);

void CParamDialog::on_ButtonAdd_clicked()
{
Model::XianStruct addMe;

ModelData->insertRows(0, 1);

ModelData->setData( ModelData->index(-1), &addMe, Qt::DisplayRole); ???

}

// model.h
class Model : public QAbstractListModel
{
Q_OBJECT

public:
Model(QObject *parent = 0);
~Model();

QVariant data(const QModelIndex &index, int role) const;
QVariant headerData(int section, Qt::Orientation orientation, int role) const;

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

//Required to be able to resize the model (add & remove shit)
bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex());
bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());

struct XianStruct
{
qint32 iZaShu, iFenZhi;
float fZhouBegin, fZhouEnd, fDiameter ;
//Make a quick constructor for our struct to have default values for a new item
XianStruct()
{
iZaShu = 50;
iFenZhi = 1;
fZhouBegin = 8.0;
fZhouEnd = 60.0;
fDiameter = 0.6;
}
};

private:

QList<XianStruct> _data;

};

Q_DECLARE_METATYPE(Model::XianStruct);


//model.cpp
QVariant Model::data(const QModelIndex &index, int role) const
{
if (!index.isValid())
return QVariant();

int row = index.row();
if ( row < 0 || row >= _data.count() )
return QVariant();

if (role == Qt::DisplayRole)
{
switch( index.column() ){
case 0: return _data[row].iZaShu;
case 1: return _data[row].iFenZhi;
case 2: return _data[row].fZhouBegin;
case 3: return _data[row].fZhouEnd;
case 4: return _data[row].fDiameter;
default: return _data[row].iZaShu;
}
}
else
return QVariant();

return QVariant();
}
bool Model::setData(const QModelIndex &index, const QVariant &value, int role )
{
if (index.isValid() && role == Qt::DisplayRole)
{
int row = index.row();

XianStruct newData = value.value<XianStruct>();

//get a pointer to the list item so we can change its contents
_data[row].iZaShu = newData.iZaShu;
_data[row].iFenZhi = newData.iFenZhi;
_data[row].fZhouBegin = newData.fZhouBegin;
_data[row].fZhouEnd = newData.fZhouEnd;
_data[row].fDiameter = newData.fDiameter;

emit dataChanged( index, index);

return true;
}
else return false;
}:confused:

Don't use -1 to query an index. It will return an invalid index.

Code:

---

ModelData->insertRows(0, 1);
ModelData->setData( ModelData->index(0), &addMe, Qt::DisplayRole);

---

Also, I'm afraid there is something wrong with the way the custom struct is passed around:

Code:

---

void CParamDialog::on_ButtonAdd_clicked()
{
   Model::XianStruct addMe;
   ...
   ModelData->setData(..., &addMe, ...);
}
 
bool Model::setData(const QModelIndex &index, const QVariant &value, int role )
{ 
   ...
   XianStruct newData = value.value<XianStruct>();
   ...
}

---

Notice that you are passing a pointer but then you're expecting it to be a value.