Qt - How to Remove the selected Row from the QTableView and copy it to the QLineEdit

Question

I have 3 QLineEdits (say Name, Address & Phone No.), 2 QPushButton (Add & Modify) and a QTableView.

When I enter text in all the QLineEdits, and if I click the Add button, all 3 texts of the QLineEdits should be added in the 1st row of the QTableView.
Again if I enter 3 text's in the QLineEdit and the Add Button is Clicked, the Text's should be placed in the 2nd row of the QTableView. Like this it should go on. I did this all and it works fine.

Now if I select any row from the QTableView and once I click the Modify Button the selected Row has to be removed from the QTableView and the Items should be again placed in their respective QLineEdits.

How can I do this ?

Example.h

#ifndef EXAMPLE_H
#define EXAMPLE_H

#include <QWidget>
#include <QStandardItemModel>

namespace Ui {
class Example;
}

class Example : public QWidget
{
    Q_OBJECT

public:
    explicit Example (QWidget *parent = 0);
    ~Example();

private slots:
    void on_addButton_released();
    void on_modifyButton_released();

private:
    Ui::Example*ui;
    QStandardItemModel *model;
};

#endif // EXAMPLE_H

EXAMPLE.CPP

#include "Example.h"

Example::Example(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Example)
{
    ui->setupUi(this);
    model = new QStandardItemModel();

    ui->tableView->setModel(model);

}

Example::~Example()
{
    delete ui;
}

void Example::on_addButton_released()
{
    model->setHorizontalHeaderItem(0, new QStandardItem(QString(" NAME ")));
    model->setHorizontalHeaderItem(1, new QStandardItem(QString(" ADDRESS ")));
    model->setHorizontalHeaderItem(2, new QStandardItem(QString(" PHONE NO ")));

    QStandardItem *nameItem = new QStandardItem(ui->nameLineEdit->text());
    QStandardItem *addressItem = new QStandardItem(ui->addressLineEdit->text());
    QStandardItem *phoneItem = new QStandardItem(ui->phoneLineEdit->text());

    QList<QStandardItem*> row;
    row << nameItem << addressItem << phoneItem;

    model->appendRow(row);

    ui->nameLineEdit->clear();
    ui->addressLineEdit->clear();
    ui->mobileLineEdit->clear();
    ui->emailLineEdit->clear();
}

void Example::on_modifyButton_released()
{


}

Answer 1

What you want to do is when the Modify button is clicked, access the selection from the QItemSelectionModel of your QTableView. Once you have the selection, if any, process it.

For example:

void Example::on_modifyButton_released()
{
    if( ui->myTableView )
    {
         QModelIndex currentIndex = ui->myTableView->selectionModel();

         // Make sure to check the index is valid, as the user
         // may not have selected a row.
         if( currentRow.isValid() )
         {
              // Add your code here to copy the data to 
              // your QLineEdit and remove the row from your
              // QStandardModel.
              ...                  
         }
    }
}

For reference:

QTableView http://qt-project.org/doc/qt-4.8/QTableView.html

QItemSelectionModel http://qt-project.org/doc/qt-4.8/QItemSelectionModel.html