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# 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);
     }