EXAMPLE:Trying to understand model/view with QTableView!!!

[fatecasino]

well, I have read some tens of times most tutorials,posts and examples. I think I have understood most of the functions and classes, but I fail to put all these together.

I am looking for a very simple example:

a tableview with just 1 row and 2 columns, just two boxes.
One box should be a widget-qcombobox and the other just normal box to insert a string.

Now, I want to connect the database of the tableview with a QLineEdit (let's call it resultLineEdit) every time a new value is inserted by the user.

Can you give me a piece of code to start with?

---

Added after 1 58 minutes:

i started like this:

class M : public QWidget
{
    Q_OBJECT
 
public:
    M(QWidget *parent = 0);
 
 
private:
    QStandardItemModel *model;
    QTableView *table;
 
    QLineEdit * resultEdit;
    QPushButton *quit;
 
};

class M : public QWidget
{
    Q_OBJECT

public:
    M(QWidget *parent = 0);


private:
    QStandardItemModel *model;
    QTableView *table;

    QLineEdit * resultEdit;
    QPushButton *quit;

};

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M::M(QWidget *parent)
    : QWidget(parent)
{
    int r = 2,c = 2;
 
    model = new QStandardItemModel(r,c);
    table = new QTableView();
    table->setModel(model);
 
    for (int row = 0; row < r; ++row) {
        for (int column = 0; column < c; ++column) {
            QStandardItem *item = new QStandardItem(QString("iii"));
            model->setItem(row,column,item);
        }
    }
 
    resultEdit = new QLineEdit;
    resultEdit->setText("results here....");
    quit =  new QPushButton;
    quit->setText("quit!");
    connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));
    QVBoxLayout *mainLayout = new QVBoxLayout();
    mainLayout->addWidget(resultEdit);
    mainLayout->addWidget(quit);
    mainLayout->addWidget(table);
    setLayout(mainLayout);
}

M::M(QWidget *parent)
    : QWidget(parent)
{
    int r = 2,c = 2;

    model = new QStandardItemModel(r,c);
    table = new QTableView();
    table->setModel(model);

    for (int row = 0; row < r; ++row) {
        for (int column = 0; column < c; ++column) {
            QStandardItem *item = new QStandardItem(QString("iii"));
            model->setItem(row,column,item);
        }
    }

    resultEdit = new QLineEdit;
    resultEdit->setText("results here....");
    quit =  new QPushButton;
    quit->setText("quit!");
    connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));
    QVBoxLayout *mainLayout = new QVBoxLayout();
    mainLayout->addWidget(resultEdit);
    mainLayout->addWidget(quit);
    mainLayout->addWidget(table);
    setLayout(mainLayout);
}

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the question is:
how can I connect the the changes of any item of the table to the slot setText(QString) of the resultEdit?

[fatecasino]

Is it a combination of the following?

QItemSelectionModel
QModelIndex
Qt:: DisplayRole

any small code example would be really helpful!

[wysota]

QTableView is not really fit for what you want. I would rather use QDataWidgetMapper. It uses widgets to display data from a model. QTableView doesn't.

[fatecasino]

just to understand,
do you mean that if I generally want to display/use the data from the model/view architecture I have to use QDataWidgetMapper? What I really want to do is the user to set some parameters to plot a scientific diagram through qwt. The user would inserts these values (boxes and qcomboboxes) and if necessary s/he would add a new row and insert more (it's a complex curve fitting problem)