informationwindow.cpp Example File
^{sql/drilldown/informationwindow.cpp}

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 #include "informationwindow.h"

 InformationWindow::InformationWindow(int id, QSqlRelationalTableModel *offices,
                                      QWidget *parent)
     : QDialog(parent)
 {
     QLabel *locationLabel = new QLabel(tr("Location: "));
     QLabel *countryLabel = new QLabel(tr("Country: "));
     QLabel *descriptionLabel = new QLabel(tr("Description: "));
     QLabel *imageFileLabel = new QLabel(tr("Image file: "));

     createButtons();

     locationText = new QLabel;
     countryText = new QLabel;
     descriptionEditor = new QTextEdit;

     imageFileEditor = new QComboBox;
     imageFileEditor->setModel(offices->relationModel(1));
     imageFileEditor->setModelColumn(offices->relationModel(1)->fieldIndex("file"));

     mapper = new QDataWidgetMapper(this);
     mapper->setModel(offices);
     mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
     mapper->setItemDelegate(new QSqlRelationalDelegate(mapper));
     mapper->addMapping(imageFileEditor, 1);
     mapper->addMapping(locationText, 2);
     mapper->addMapping(countryText, 3);
     mapper->addMapping(descriptionEditor, 4);
     mapper->setCurrentIndex(id);

     connect(descriptionEditor, SIGNAL(textChanged()),
             this, SLOT(enableButtons()));
     connect(imageFileEditor, SIGNAL(currentIndexChanged(int)),
             this, SLOT(enableButtons()));

     QGridLayout *layout = new QGridLayout;
     layout->addWidget(locationLabel, 0, 0, Qt::AlignLeft | Qt::AlignTop);
     layout->addWidget(countryLabel, 1, 0, Qt::AlignLeft | Qt::AlignTop);
     layout->addWidget(imageFileLabel, 2, 0, Qt::AlignLeft | Qt::AlignTop);
     layout->addWidget(descriptionLabel, 3, 0, Qt::AlignLeft | Qt::AlignTop);
     layout->addWidget(locationText, 0, 1);
     layout->addWidget(countryText, 1, 1);
     layout->addWidget(imageFileEditor, 2, 1);
     layout->addWidget(descriptionEditor, 3, 1);
     layout->addWidget(buttonBox, 4, 0, 1, 2);
     setLayout(layout);

     locationId = id;
     displayedImage = imageFileEditor->currentText();

     setWindowFlags(Qt::Window);
     enableButtons(false);
     setWindowTitle(tr("Trolltech Office: %1").arg(locationText->text()));
     resize(320, sizeHint().height());
 }

 int InformationWindow::id()
 {
     return locationId;
 }

 void InformationWindow::revert()
 {
     mapper->revert();
     enableButtons(false);
 }

 void InformationWindow::submit()
 {
     QString newImage(imageFileEditor->currentText());

     if (displayedImage != newImage) {
         displayedImage = newImage;
         emit imageChanged(locationId, newImage);
     }

     mapper->submit();
     mapper->setCurrentIndex(locationId);

     enableButtons(false);
 }

 void InformationWindow::createButtons()
 {
     closeButton = new QPushButton(tr("&Close"));
     revertButton = new QPushButton(tr("&Revert"));
     submitButton = new QPushButton(tr("&Submit"));

     closeButton->setDefault(true);

     connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));
     connect(revertButton, SIGNAL(clicked()), this, SLOT(revert()));
     connect(submitButton, SIGNAL(clicked()), this, SLOT(submit()));

     buttonBox = new QDialogButtonBox;
     buttonBox->addButton(submitButton, QDialogButtonBox::ResetRole);
     buttonBox->addButton(revertButton, QDialogButtonBox::ResetRole);
     buttonBox->addButton(closeButton, QDialogButtonBox::RejectRole);
 }

 void InformationWindow::enableButtons(bool enable)
 {
     revertButton->setEnabled(enable);
     submitButton->setEnabled(enable);
 }