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#include <QtGui>

#include <QtSql>

#include "window.h"

//! [Set up widgets]

Window::Window(QWidget *parent)

    : QWidget(parent)

{

    setupModel();

    nameLabel = new QLabel(tr("Na&me:"));

    nameEdit = new QLineEdit();

    addressLabel = new QLabel(tr("&Address:"));

    addressEdit = new QTextEdit();

    typeLabel = new QLabel(tr("&Type:"));

    typeComboBox = new QComboBox();

    nextButton = new QPushButton(tr("&Next"));

    previousButton = new QPushButton(tr("&Previous"));

    nameLabel->setBuddy(nameEdit);

    addressLabel->setBuddy(addressEdit);

    typeLabel->setBuddy(typeComboBox);

//! [Set up widgets]

//! [Set up the mapper]

    QSqlTableModel *relModel = model->relationModel(typeIndex);

    typeComboBox->setModel(relModel);

    typeComboBox->setModelColumn(relModel->fieldIndex("description"));

    mapper = new QDataWidgetMapper(this);

    mapper->setModel(model);

    mapper->setItemDelegate(new QSqlRelationalDelegate(this));

    mapper->addMapping(nameEdit, model->fieldIndex("name"));

    mapper->addMapping(addressEdit, model->fieldIndex("address"));

    mapper->addMapping(typeComboBox, typeIndex);

//! [Set up the mapper]

//! [Set up connections and layouts]

    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();

    layout->addWidget(nameLabel, 0, 0, 1, 1);

    layout->addWidget(nameEdit, 0, 1, 1, 1);

    layout->addWidget(previousButton, 0, 2, 1, 1);

    layout->addWidget(addressLabel, 1, 0, 1, 1);

    layout->addWidget(addressEdit, 1, 1, 2, 1);

    layout->addWidget(nextButton, 1, 2, 1, 1);

    layout->addWidget(typeLabel, 3, 0, 1, 1);

    layout->addWidget(typeComboBox, 3, 1, 1, 1);

    setLayout(layout);

    setWindowTitle(tr("SQL Widget Mapper"));

    mapper->toFirst();

}

//! [Set up connections and layouts]

//! [Set up the main table]

void Window::setupModel()

{

    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");

    db.setDatabaseName(":memory:");

    if (!db.open()) {

        QMessageBox::critical(0, tr("Cannot open database"),

            tr("Unable to establish a database connection.\n"

               "This example needs SQLite support. Please read "

               "the Qt SQL driver documentation for information how "

               "to build it."), QMessageBox::Cancel);

        return;

    }

    QSqlQuery query;

    query.exec("create table person (id int primary key, "

               "name varchar(20), address varchar(200), typeid int)");

    query.exec("insert into person values(1, 'Alice', "

               "'<qt>123 Main Street<br/>Market Town</qt>', 101)");

    query.exec("insert into person values(2, 'Bob', "

               "'<qt>PO Box 32<br/>Mail Handling Service"

               "<br/>Service City</qt>', 102)");

    query.exec("insert into person values(3, 'Carol', "

               "'<qt>The Lighthouse<br/>Remote Island</qt>', 103)");

    query.exec("insert into person values(4, 'Donald', "

               "'<qt>47338 Park Avenue<br/>Big City</qt>', 101)");

    query.exec("insert into person values(5, 'Emma', "

               "'<qt>Research Station<br/>Base Camp<br/>"

               "Big Mountain</qt>', 103)");

//! [Set up the main table]

//! [Set up the address type table]

    query.exec("create table addresstype (id int, description varchar(20))");

    query.exec("insert into addresstype values(101, 'Home')");

    query.exec("insert into addresstype values(102, 'Work')");

    query.exec("insert into addresstype values(103, 'Other')");

    model = new QSqlRelationalTableModel(this);

    model->setTable("person");

    model->setEditStrategy(QSqlTableModel::OnManualSubmit);

    typeIndex = model->fieldIndex("typeid");

    model->setRelation(typeIndex,

           QSqlRelation("addresstype", "id", "description"));

    model->select();

}

//! [Set up the address type table]

//! [Slot for updating the buttons]

void Window::updateButtons(int row)

{

    previousButton->setEnabled(row > 0);

    nextButton->setEnabled(row < model->rowCount() - 1);

}

//! [Slot for updating the buttons]