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{{CodeSnippet
|id=...
|platform=S60 3rd Edition, S60 5th Edition
|devices=S60 Emulator
|category=Qt for Symbian
|subcategory= UI
|creationdate= 26 June 2009
|keywords=QStandardItemModel,QDataWidgetMapper 
}}

[[Category:Qt]][[Category:Qt for Symbian]][[Category:S60]][[Category:How To]][[Category:Code Examples]]

== 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:[http://www.qtsoftware.com/downloads QtIDEv4.5]

==Source Code==
===Header File===
<code cpp>
#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
</code>

===Source File===
<code cpp>
#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);
}
</code>

==Screenshot==
[[Image:Widmapper.jpg]]


==Related Links==
[http://wiki.forum.nokia.com/index.php/Mapping_signal_via_signalMapper Mapping signal via signalMapper]