informationwindow.cpp Example File

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  #include "informationwindow.h"

  InformationWindow::InformationWindow(int id, QSqlRelationalTableModel *items,
                                       QWidget *parent)
      : QDialog(parent)
  {
      QLabel *itemLabel = new QLabel(tr("Item: "));
      QLabel *descriptionLabel = new QLabel(tr("Description: "));
      QLabel *imageFileLabel = new QLabel(tr("Image file: "));

      createButtons();

      itemText = new QLabel;
      descriptionEditor = new QTextEdit;

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

      mapper = new QDataWidgetMapper(this);
      mapper->setModel(items);
      mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
      mapper->setItemDelegate(new QSqlRelationalDelegate(mapper));
      mapper->addMapping(imageFileEditor, 1);
      mapper->addMapping(itemText, 2, "text");
      mapper->addMapping(descriptionEditor, 3);
      mapper->setCurrentIndex(id);

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

      QFormLayout *formLayout = new QFormLayout;
      formLayout->addRow(itemLabel, itemText);
      formLayout->addRow(imageFileLabel, imageFileEditor);
      formLayout->addRow(descriptionLabel, descriptionEditor);

      QVBoxLayout *layout = new QVBoxLayout;
      layout->addLayout(formLayout);
      layout->addWidget(buttonBox);
      setLayout(layout);

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

      setWindowFlags(Qt::Window);
      enableButtons(false);
      setWindowTitle(itemText->text());
  }

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

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

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

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

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

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

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