From Forum Nokia Wiki

ID	...	Creation date	26 June 2009
Platform	S60 3rd Edition, S60 5th Edition	Tested on devices	S60 Emulator
Category	Qt for Symbian	Subcategory	UI

Keywords (APIs, classes, methods, functions): QStandardItemModel,QDataWidgetMapper

Overview

This will show you the mapping of the StandardItemModel to DataWidgetMapper and directly to QLineEdit.

QDataWidgetMapper can be used to create data-aware widgets by mapping them to sections of an item model. A section is a column of a model if the orientation is horizontal (the default), otherwise a row.

Preconditions

• Download and Install latest version Qt for Symbian - Installation packages which has links on how to install the latest version

• Download Qt creator IDE:QtIDEv4.5

Source Code

Header File

#ifndef MODEL_H
#define MODEL_H
 
#include <QtGui/QWidget>
#include<QLabel>
#include<QLineEdit>
#include<QPushButton>
#include<QStandardItemModel>
#include<QStringListModel>
#include<QDataWidgetMapper>
#include<QGridLayout>
#include<QStandardItem>
#include<QStringList>
class model : public QWidget
{
    Q_OBJECT
 
public:
    model(QWidget *parent = 0);
    ~model();
 
private slots:
     void updateButtons(int row);
 
 private:
     void virModel();
 
     QLabel *nameLabel;
     QLineEdit *nameEdit;
     QPushButton *nextButton;
     QPushButton *previousButton;
     QStandardItemModel *modelversion;
     QStringListModel *typeModel;
     QDataWidgetMapper *mapper;
 };
 
#endif // MODEL_H

Source File

#include "model.h"
model::model(QWidget *parent)
    : QWidget(parent)
{
    virModel();
 
     nameLabel = new QLabel(tr("Na&me:"),this);
     nameEdit = new QLineEdit(this);
     nameLabel->setBuddy(nameEdit);
     nextButton = new QPushButton(tr("&Next"),this);
     previousButton = new QPushButton(tr("&Previous"),this);
     mapper = new QDataWidgetMapper(this);
     mapper->setModel(modelversion);    //mapping of the dataModel is Done
     mapper->addMapping(nameEdit,0);
     connect(previousButton, SIGNAL(clicked()),mapper,SLOT(toPrevious()));
    connect(nextButton, SIGNAL(clicked()),
             mapper, SLOT(toNext()));
     connect(mapper, SIGNAL(currentIndexChanged(int)),
             this, SLOT(updateButtons(int)));
 
    QGridLayout *layout = new QGridLayout(this);     //Widget Layout is set
     layout->addWidget(nameLabel, 0, 0, 1, 1);
     layout->addWidget(nameEdit, 0, 1, 1, 1);
     layout->addWidget(previousButton, 0, 2, 1, 1);
     layout->addWidget(nextButton, 1, 2, 1, 1);
     setLayout(layout);
     setWindowTitle(tr("Widget Mapper"));
     mapper->toFirst();
}
 
model::~model()
{
   // No need to delete any object that has got a parent which is properly deleted.
}
void model::virModel()  //Whole the stringlist items are added to standardItemModel
{                                     
    modelversion = new QStandardItemModel(5,1,this);
 
    QStringList names;
     names << "symbian" << "UIQ" << "ANDROID" << "NOKIA" << "APPLE";
 
    for (int row = 0; row < 5; ++row)
     {
       QStandardItem *item = new QStandardItem(names[row]);
       modelversion->setItem(row, 0, item);
     }
 
 
}
void model::updateButtons(int row) //Module Execute when their is updation in QLineEdit
{
        previousButton->setEnabled(row > 0);
    nextButton->setEnabled(row < modelversion->rowCount() - 1);
}

Screenshot

Related Links

Mapping signal via signalMapper