QTableView Not Updating After Adding a New Row

Satish Joshi

Thank You so much for your time brother.

But sadly it didn't work. Actually, I want the view to update automatically after adding the new row through a dialog box. As I can see the changes if I reopen the particular window again.

Also, my model has the updated data but somehow I don't know why table view is not updating.

Thanks

MasterBLB

Hmmm...try emit dataChanged(model->index(i, 0), model->index(i, 1), <maybe you'll have to pass 3rd parameter as well>) just after the line which adds new row.
If that won't help then there are last resort methods - beginResetModel() before adding rows, and after completing add row operation endResetModel()
Soo, merging my answers so far the output code would be:

for (int i = 0; i < clusterNames.length(); i++)
{
    model->appendRow( { new QStandardItem(clusterNames[i]), new QStandardItem(clusterIPs[i]) } );
    emit dataChanged(model->index(i, 0), model->index(i, 1));//maybe you'll have to pass 3rd parameter as well
}

raven-worx

@Satish-Joshi said in QTableView Not Updating After Adding a New Row:

Actually, I want the view to update automatically after adding the new row through a dialog box.

i explained why it doesnt update.
What exactly have you tried?!

Satish Joshi

@raven-worx

Yes I understand what you trying to explain and have used your suggested approach and
I have used QStandardItemModel::insertRow(). But it didn't work.

Thanks

Satish Joshi

@MasterBLB

you mean to say QAbstractItemModel::dataChanged(.....) right?

I did it like this way :

// In header File
signals:
    void dataChanged(const QModelIndex & topLeft, const QModelIndex & bottomRight);

// On the Loop
emit model->dataChanged(model->index(i, 0), model->index(i, 1));

Sorry but this time it also didn't work or I am missing something. Please let me know

Thanks

raven-worx

@Satish-Joshi
you are not doing what i suggested.
Try this:

model = new QStandardItemModel(this);
model->setColumnCount( 2 );
//...
for(int i = 0; i < clusterNames.length(); i++)
{
        QStandardItem *clusterName_i = new QStandardItem(clusterNames[i]);
        QStandardItem *clusterIP_i = new QStandardItem(clusterIPs[i]);
        model->appendRow( QList<QStandardItem*>() << clusterName_i << clusterIP_i );
}

Satish Joshi

@raven-worx

Sorry. It didn't work though

I think there might be some issue with Widget or QSubWindow because as I already mentioned that the values are already updating on the model (checked through debugging it) but couldn't be displayed on the View.

As if I reopen the window it displays properly.

What do you think?

Thanks Anyway

MasterBLB

Use that beginResetModel() and endResetModel() methods then, these makes a model completely invalidated, and therefore force a thorough update.

model->beginResetModel();
for (int i = 0; i < clusterNames.length(); i++)
{
    model->appendRow( { new QStandardItem(clusterNames[i]), new QStandardItem(clusterIPs[i]) } );  
}
model->endResetModel();

Satish Joshi

@MasterBLB

It seems both are protected members so can't access through it.

Thanks

MasterBLB

Inherit QStandardItemModel, and declare public functions like beginReset() and endReset() whose internally invoke these protected methods.